aaf -hermannelson classroom unit ventilators...aaf®-hermannelson® classroom unit ventilators...
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AAF®-HermanNelson® Classroom Unit VentilatorsDigital Ready, MicroTech II™ (“F” Vintage)Field Controls by Others
©2007 McQuay International
Vertical Floor Models AVS, AVV, AVB, and AVR
Before beginning installation, please read this publication in its entirety.Develop a thorough understanding before starting the installation procedure.
This manual is to be used as a guide. Each installation is unique, so only general topics are covered. The order in which topics are covered may not be those required for the actual installation.
IMPORTANT!
C
InstallationManual IM817-2
Group: UnitVentilator Part Number: 106506223
Date: December2007
Table of ContentsNomenclature ModelAVCeilingUnitVentilatorDataPlateDetails........................1 DataPlateLocation.........................................................................2
Receiving & Handling VisibleLossorDamage...................................................................2 ConcealedLossorDamage............................................................2 Storage............................................................................................2 LiftingUnit.......................................................................................2
Pre-Installation Information Safety...........................................................................................2-3
Pre-Installation Considerations ProperlyIdentifyUnitVentilator(s)...................................................3 UncrateandInspecttheUnitVentilator(s).......................................3 WallOpenings,Louvers,andVentiMaticShutter............................3 VentiMaticShutterAssembly...........................................................3 Table1-ApproximateShippingWeights,PhysicalData.................3
Installing Louvers ....................................................................................4-8 LouverDetails.................................................................................4Louver Installations with Typical Unit Configurations UnitConfiguration-TypeAL............................................................5 UnitConfiguration-TypeAN...........................................................6 UnitConfiguration-TypeAK...........................................................6 UnitConfiguration-TypeAP...........................................................6 TypicalInstallationMethods.........................................................7-8
Installing the VentiMatic Shutter ............................................................8-9
Before Setting the Unit in Place RemovingUnitfromSkid.................................................................9 MountingHoles,PipingandElectricalKnockout Locations&Dimensions..................................................................9
Drain Pan Adjustment Procedure......................................................................................10
Typical Floor Unit Installation ................................................................. 11
Typical VentiMatic Shutter & Draftstop Installation .............................. 11
Unit Ventilator Installation ....................................................................... 12
Making Piping Connections ForAllSystems.............................................................................12 WaterCoilConnections.................................................................13 2-pipeChilledWater/HotWaterSystems......................................13 AfterBrazing..................................................................................13 ForWaterSystems........................................................................13
Coil Headers, Locations HeatingOnly..................................................................................14 CoolingOnly..................................................................................14 ChilledWater&HeatingCoils.......................................................15 DirectExpansionCoils&HeatingCoils........................................15 Reheat...........................................................................................16
Typical Valve Packages FaceandBypass-MicroTechII 2-wayand3-wayEnd-of-CycleValves..........................................17 2-wayand3-wayModulatingValves–MicroTechII......................18 ModulatingValveSpecifications–MicroTechII.............................19 SteamModulatingValveSelection–MicroTechII.........................20 HotWaterandChilledWaterValveSelection–MicroTechII........20
Typical Piping Arrangements Heating–HotWaterEndofCycleValvePiping............................21 Cooling–ChilledWaterEndofCycleValvePiping.......................21 TypicalWaterCoilPiping–EOCValvePiping................................22 Steam–TypicalModulatingValvePiping........................................22
For Steam Systems Theoptionalfactory-suppliedAAF-HermanNelsonMicroTechII
ModulatingControlValve...............................................................23 TypicalSteamCoilPiping..............................................................23Heating–Modulating Valve Piping HotWater(or2-pipeCW/HW)ModulatingValvePiping...............24 2-wayModulating,NormallyOpen,HotWateror2-pipeCW/HW
ValvePiping(typical).....................................................................24 3-wayModulating,NormallyOpen,HotWateror2-pipeCW/HW
ValvePiping(typical).....................................................................24Cooling–Chilled Water Modulating Valve Piping 2-wayModulating,NormallyClosed,ChilledWaterValvePiping
(typical)..........................................................................................25 3-wayModulating,NormallyClosed,ChilledWaterValvePiping
(typical)..........................................................................................25
Condensate Piping ................................................................................... 26 DirectExpansion(DX)R-22Piping...............................................26
Unit Ventilator Split Systems Guidelines ............................................... 27 CheckingSystemCharge..............................................................28 DeterminingSubcooling................................................................28 DeterminingSystemSuperheat....................................................29 SuperheatAdjustment...................................................................29
Making Control Connections MicroTechIIUnitMountedDDCControlComponents–ModelsAVS,
AVV,andAVR...........................................................................30-32 EconomizerControlCapabilities...................................................32 EconomizerforReheat..................................................................32 LocalUserInterface......................................................................32 OperatingModeStates(4)............................................................32 FanStates(4)................................................................................32 OccupancyModes(4)...................................................................32 MicroTechIIWiringDiagram–Typical...........................................33MicroTech II Unit Electrical Connections .............................................................. 34 Procedure......................................................................................34 MicroTechIIRemoteWallMountedSensor..................................35 FieldWiringRemoteMountedTemperatureSensor.....................36 InstallingtheRemoteMountedTemperatureSensor...............36-38Digital Ready™–Face & Bypass Control Components ModelAVS.....................................................................................39 DigitalReadyWiringDiagram–Typical..........................................40 DigitalReadyUnitMountedTemperatureSensor Specifications................................................................................41 DigitalReady–DamperActuatorSpecifications OutdoorAir/ReturnAirDamperActuator.......................................41 Face&BypassDamperActuator..................................................41Digital Ready Unit Electrical Connections Procedure......................................................................................42Controls by Others Components ........................................................................... 43 ControlsbyOthersWiringDiagram–Typical.................................44 ControlsbyOthers–ElectricalConnections...................................45 Procedure......................................................................................45 ElectricHeatWiringDiagram–Typical...........................................46 ElectricHeating–StandardMotorCapacities,Amps,WireSizing,
andOverCurrentProtection.........................................................47 ElectricHeating–HighStaticApplicationsCapacities,Amps,Wire
Sizing,andOverCurrentProtection..............................................48
Cabinets Draftstop™System/WindowDown-draftInstallation................49-51 InstallingUnitVentilatorEndPanels........................................51-52
Prepare Unit Ventilator for Start-up ........................................................ 52 OilingtheFanShaftEndBearing..................................................52
Filter(s) ...................................................................................................... 53
Complete Check, Test and Start Procedure ........................................... 53
Installer’s Responsibility Protectyourinvestment-readcarefully.......................................53
IM 817-2 Page 1 of 58
BD= BasicLonMarkSCCw/oTCw/CO2BE= BasicMetasysN2Openw/oTCw/CO2BF = BasicStand-Alonew/TCw/CO2BG= BasicStand-AloneMasterw/TCw/CO2E1 = ExpandedStand-Alonew/oTCE2 = ExpandedStand-AloneMasterw/oTCE3 = ExpandedStand-AloneServantw/oTCE4 = ExpandedBACnetMS/TPw/oTCE5 = ExpandedLonMarkSCCw/oTCE6 = ExpandedMetasysN2Openw/oTCE7 = ExpandedStand-Alonew/TCE8 = ExpandedStand-AloneMasterw/TCE9 = ExpandedStand-Alonew/oTCw/CO2EA= ExpandedStand-AloneMasterw/oTCw/CO2EB= ExpandedStand-AloneServantw/oTCw/CO2EC= ExpandedBACnetMS/TPw/oTCw/CO2ED= ExpandedLonMarkSCCw/oTCw/CO2EE = ExpandedMetasysN2Openw/oTCw/CO2EF = ExpandedStand-Alonew/TCw/CO2EG= ExpandedStand-AloneMasterw/TCw/CO2L1 = LeadingStand-Alonew/oTCL2 = LeadingStand-AloneMasterw/oTCL3 = LeadingStand-AloneServantw/oTCL4 = LeadingBACnetMS/TPw/oTCL5 = LeadingLonMarkSCCw/oTCL6 = LeadingMetasysN2Openw/oTCL7 = LeadingStand-Alonew/TCL8 = LeadingStand-AloneMasterw/TCL9 = LeadingStand-Alonew/oTCw/CO2LA= LeadingStand-AloneMasterw/oTCw/CO2LB= LeadingStand-AloneServantw/oTCw/CO2LC= LeadingBACnetMS/TPw/oTCw/CO2LD= LeadingLonMarkSCCw/oTCw/CO2LE = LeadingMetasysN2Openw/oTCw/CO2LF = LeadingStand-Alonew/TCw/CO2LG= LeadingStand-AloneMasterw/TCw/CO2 10. DischargeAB=21-7/8"Unit,TopBarGrilleDischarge,FullAdapterBackwClosedPipe TunnelwSolidBackAK= 21-7/8"Unit,TopBarGrilleDischarge,PartialAdapterBackwOpenPipe TunnelAL =16-5/8"Unit,TopBarGrilleDischargeAM=21-7/8"Unit,TopBarGrilleDischarge,2"StepdownFullAdapterBackw ClosedPipeTunnelAN=21-7/8"Unit,TopBarGrilleDischarge,FullAdapterBackwClosedPipe TunnelAP =21-7/8"Unit,TopBarGrilleDischarge,PartialAdapterBackwClosedPipe Tunnel,TopDuctIntake
11. Return Air (RA) / Outside Air (OA)22 = RABottomFront/OARearDuctCollar24 = 100%RABottomFront/NoOAOpening/NoOA/RADampers30 = RABottomFrontwDraftStop/OARearDuctCollar
12. Power ConnectionG = BoxwSwitch
13. ColorB = PuttyBeigeG = SoftGrayI = AntiqueIvoryW = OffWhite
14. SKUB = StandardDeliveryC = ExtendedDelivery
15. Product Style1
Field-InstalledAccessoriesmayaccompanyUnitVentilator(s),ormaybeshippedseparately.Thesemayinclude:AdapterBacks;AluminumLouvers;AluminumGrilles;AuxiliaryDrainPans;Controls/Sensors;EndPanels;SpareFilters;MicroTechIIControls,RemoteWallSensors(temperature);EndofCycleDDCValve;ModulatingDDCValves;Subbases.Seeinstructionsshippedwithaccessoriesandinstallaccordingtotheseandtheplans.
1. Product CategoryU = UnitVentilator
2. Product Identifier*AVS = Floor,FaceandBypassDamper,Heat/Cool,HeatOnly,CoolOnlyAVV = Floor,ValveControl,HydronicorElectricHeat/Cool,HeatOnly,CoolOnlyAVR = Floor,ValveControl,HydronicorElectricReheat/DehumidAVB = Floor,FaceandBypassDamper,HydronicReheat*Endpanelsnotincluded;Orderedasaccessory,shippedseparatelyboxed
3. Design Series5 = EDesign6 = FDesign
4. Nominal Capacity, cubic feet per minute (cfm)S07 =750S10 =1000S13 =1250S15 =1500
5. Voltage, volts, phase, Hertz (v-Hz-ph)A = 115-60-1C = 208-60-1G = 230-60-1J = 265-60-1D = 208-60-3H = 230-60-3K = 460-60-3
6. Cooling OptionsU = 2-rowChilledWater/HotWater,2-pipeD = 3-rowChilledWater/HotWater,2-pipeE = 4-rowChilledWater/HotWater,2-pipeF = 5-rowChilledWater/HotWater2-pipeG = DirectExpansion(DX)S = 3-rowChilledWaterV = 2-rowChilledWaterW = 4-rowChilledWaterY = 5-rowChilledWater
7. Heating Options00 = None12 = LowElectricHeat,3-element13 =HighElectricHeat,6-element65 = 1-row,HotWater66 = 2-row,HotWater67 = 3-row,HotWater68 = LowCapacitySteam69 = HighCapacitySteam78 = LowCapacitySteam,OppositeEndDrain79 = HighCapacitySteam,OppositeEndDrain
8. Hand Orientation [Right (RH) Left (LH)]A = LHBothCoils(onlywControlsbyOthers)B = RHBothCoils(onlywControlsbyOthers)D = RHElectricHeating,OneCoilE =LHHeating,RHCoolingF = RHHeating,LHCoolingG = RHElectricHeating,LHCoolingR = LHSingleCoilS = RHSingleCoil
9. Controls (TC = Time Clock, CO2 = CO2 Sensor) 23 =FieldMountedControlsbyOthers17 = DigitalReady/withDamperActuators,(3)@10kNTC Sensors,3Terminal Strips,75VA24VoltT’fmr,w/oUVControllerB1 = BasicStand-Alonew/oTCB2 = BasicStand-AloneMasterw/oTCB3 = BasicStand-AloneServantw/oTCB4 = BasicBACnetMS/TPw/oTCB5 = BasicLonMarkSCCw/oTCB6 = BasicMetasysN2Openw/oTCB7 = BasicStand-Alonew/TCB8 = BasicStand-AloneMasterw/TCB9 = BasicStand-Alonew/oTCw/CO2BA= BasicStand-AloneMasterw/oTCw/CO2BB= BasicStand-AloneServantw/oTCw/CO2BC= BasicBACnetMS/TPw/oTCw/CO2
Field 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Model U AVS 6 S07 A S 65 E 23 AL 22 G B C 1
Table 1 - Unit Ventilator (Floor Type) Data Plate - Specific Information
Page 2 of 58 IM 817-2
Pre-Installation Information■ Beforebeginninginstallation,pleasereadthispublicationinits
entirety.
■ Directionsgiveninthisbulletinforrightandleftsidesassumea positionfacingtheindoorsideoftheunitventilator.
■ Beforebeginninginstallation,ifprovided,removetheprotectiveplastic film covering the unit painted panels.
Plastic packaging is a suffocation hazard, dispose of properly. Keep away from children.
SafetyFollowallsafetycodes.Wearsafetyglassesandworkgloves.Use a quenching cloth for brazing operations. Have a fireextinguisheravailable.Followallwarningsandcautionsintheseinstructionsandattachedtotheunit.ConsultapplicablelocalbuildingcodesandNationalElectricalCodes(NEC)forspecialrequirements.Recognizesafetyinformation.Whenyouseeasafetysymbolontheunitorintheseinstructions,bealerttothepotentialforpersonalinjury.UnderstandthemeaningsofthewordsDANGER,WARNING, and CAUTION. DANGER identifies the most serioushazardsthatwillresultindeathorseverepersonalinjury;WARNINGmeansthehazardscanresultindeathorseverepersonal injury; CAUTION identifies unsafe practices that canresultinpersonalinjuryorproductandpropertydamage.Improperinstallation,adjustment,service,maintenance,orusecan cause explosion, fire, electrical shock, or other conditionswhichmayresultinpersonalinjuryorpropertydamage.Thisproductmustbeinstalledonlybypersonnelwiththetraining,experience,skills,andapplicablelicensingthatmakeshim/her“aqualified professional HVACR installer.”
Make sure lifting equipment can handle the weight of the unit safely. Personal injury may result if improper lifting and moving methods are used. (See table 2, page 3 for approximate shipping weights)
Use 72" length forklift tines, short tines will damage the unit bottom. Improper handling can damage internal components. Do not stand the unit on end or stack (see figure 2 & 3)
Model AV Floor Unit Ventilator InstallationModels AVV, AVR, AVS, AVB, and AVR
Receiving & HandlingThisproductwascarefullypackedandthoroughlyinspectedbeforeleavingthefactory.Responsibilityforitssafedeliverywasassumedbythecarrieruponacceptanceoftheshipment.Claimsforlossordamagesustainedintransitmustthereforebemadeuponthecarrier,asfollows:
Visible Loss or DamageAnyexternalevidenceoflossordamagemustbenotedonthefreightbillorcarrier’sreceipt,andsignedbythecarrier’sagent.Failuretoadequatelydescribesuchexternalevidenceoflossordamagemayresultinthecarrier’srefusingtohonoradamageclaim. The form required to file such a claim will be supplied by thecarrier.
Concealed Loss or DamageConcealedlossordamagemeanslossordamagewhichdoesnotbecomeapparentuntiltheproducthasbeenunpacked.Thecontentsmaybedamagedintransitduetoroughhandlingeventhoughthecartonmaynotshowexternaldamages.Whenthedamageisdiscovereduponunpacking,makeawrittenrequestforinspection by the carrier’s agent within fifteen (15) days of thedeliverydate.Fileaclaimwiththecarriersincesuchdamageisthecarrier’sresponsibility.
StorageIf equipment is stored for any length of time before installation,it should remain in its shipping packaging in a clean, dry, climatecontrolledarea.
Lifting UnitAforkliftorotherliftingdeviceisneededtoinstallthisproduct.
Figure 1 - Data Plate Location
Figure 2 - Stack Units Maximum 2 High as Shown
2 high
CorrectIncorrect
4'6'
Figure 3 – Forklift Lifting Requirements
Lifting Points
WARNING
CAUTION
WARNING
IM 817-2 Page 3 of 58
Disconnect all electrical power before servicing unit. Electrical shock will cause severe injury or death.
Hazardous Voltage!Use copper conductors only. Unit terminals are not designed toaccept other types of conductors. Failure to do so may causedamage to the equipment.
Personal injury hazard. Wear protective gloves to avoid possible cuts and abrasions from exposed edges. Avoid contact with sharp edges.
Cleaning agents may cause serious damage to internal components, such as aluminum coils and electronic controls, etc. Do not operate unit ventilator while building maintenance cleaning agents are in use.
Pre-Installation ConsiderationsProperly Identify Unit Ventilator(s)To be sure the correct unit ventilator(s) is/are installed in thecorrectlocation(s),theinstallermustcheckthepackinglistandunitidentification/tagging number(s) against the plans. Further, the unitdata plate, (see figure 1) located on the lower right end of the unit ventilator, contains specific information of standard components as listedinTable1.
Figure 4 - Shipping Envelope Contents - Located in right end compartment of unit.
Uncrate and Inspect the Unit Ventilator(s)Carefullyremovethepackaging,remainingalerttoanysignsofshippingdamage.Becarefulnottodiscardcomponentsthatmaybeincludedwiththepackaging.(Youmaywanttoretainsomeorallofthepackagingtoprovidejobsiteunitlocationinformationandtemporaryprotectionfortheunitventilatorafterinstallation.)Besuretodisposeofplasticpackagingandprotectivecardboardproperly,inaccordancewithlocalrecyclingrulesandguidelines.If unit is damaged, file a claim with the carrier. Notify the local AAF®-HermanNelsonUnitVentilatorrepresentativeimmediately.
Wall Openings, Louvers, and VentiMatic™ ShutterPriortounitinstallation,besurethattheexteriorwallopeningsandlouvers, as applicable, are ready and in accordance with the jobplans.VerticalFloorModelsAVS,AVV,AVB,AVRare typically installedinfrontofawallopeningcontainingaproperlysizedlouverthatisdesignedtoletinoutsideairwhilepreventingwater(suchasrain)fromgettingpastthelouverandintotheunititself.Aweather-tightsealkeepsunwantedairandmoisturefromenteringtheoccupiedspace.SeeFigures6through21,andtable1forvariouslouverdetails.
VentiMatic™ Shutter AssemblyInmany installations,anAAF®-HermanNelson®VentiMaticShutterAssembly is specified. See figure 5. This one-way shutter is a continuously variable,gravityactuated,roomexhaustvent thatoperates indirectresponse to positive static pressure. It opposes any airflow into the roomandallowsaslightpositivepressure.ItisimportantthattheVentiMaticshutterandunitventilatorlouversaremountedonthesamewall.Thisneutralizestheeffectofthewind.Forcing excess air into the room through the unit ventilator louverovercomesthesamewindpressurethatworkstokeeptheVentiMaticshutterclosed.ThispreventsroomairexhaustingfromtheroomthroughtheVentiMaticshutter.
Note: Birdscreen and louver are shipped in one (1) piece.
Figure 5 – VentiMatic Shutter Assembly
Outside
Louver
VentiMatic Shutter
RoomsideRelief Air
Models Shipping Weight Approx. Shipping Filter Size Unit Length* Number AVS, AVV, lbs. (kg) Weight lbs. (kg) in. (mm) in. (mm) of Fans AVR, AVB 165/8"Units 217/8"Units
S07 350 (168) 370 (163) 10 x 36.5 x 1
62 (1575) 2 (254 x 927 x 25)
S10 425 (193) 445 (202) 10 x 48.5 x 1
74 (1880) 3 (254 x 1232 x 25)
S13 495 (225) 525 (238) 10 x 60.5 x 1
86 (2174) 4 (254 x 1551 x 25) S15 570 (259) 600 (272) Two: 10 x 36.5 x 1
98 (2489) 4 (254 x 927 x 25)
Table 2 - Approximate Shipping Weights, Physical Data
* Measurement is without end panels. All unit ventilators are 30" (762 mm) high.
DANGER
WARNING
CAUTION
WARNING
Page 4 of 58 IM 817-2
Figure 6 – Horizontal and Vertical Blade Louvers, Without Flange, (see Caution below for louver blade orientation and drainage)
Figure 7 – Horizontal and Vertical Blade Louvers, Without Flanges With Grille or With Flange Without Grille
Louver drain lipGrille/Louver with weep hole
Vertical Blade LouverHorizontal Blade Louver
Flange
Flange
Outside Air
Outside Air
Outside Air
Bird Screen On Side Toward Unit
Vertical Louver with Flange, without Grille
Horizontal Louver without Flange, with Grille
Locate Drain Lip at bottom of vertical louver to allow proper drainage. For horizontal louvers, the louver blades should face down for proper drainage. Bird screen should always be on side toward unit.
Bottom
Figure 8 – Rear of Horizontal Blade Louver with Birdscreens and Flange.
Installing LouversLouver Details
CAUTION
IM 817-2 Page 5 of 58
Figure 10 -165⁄8" (422mm) Deep Unit with Open Pipe Tunnel & High Louver Application with Chased Wall
Louver
Floor Line
Piping
Louver
Not LessThan 3" (76mm)
Not MoreThan 21" (533mm)
Sealed Cement Mortar;Pitch AwayFrom UnitProvide Drainage
Piping
Floor Line
Figure 9 - The 165/8” (422mm) Deep Unit with Open Pipe Tunnel and Standard Louver Location
Louver Installation With Typical Unit Configurations
Unit Configuration Type AL
1"(25mm)
Important:Gasket sealing surface is required.
Important:Gasket sealing surface is required.
Lintel(By Others)
Figure 11 - Above Floor Level Outdoor Air Intake Using Arrangement AV or AL With Accessory Closed Pipe Tunnel
Piping
Floor Line
Lintel (By Others)
Intake Louver
Not Less Than 3"
Not More Than 28"
Insulated Closure Plate Accessory
ProvideDrainage
Important:Gasket sealing surface is required.
Figure 12 - Floor Level Outdoor Air Intake With Window Below Unit Top Using Arrangement AL And 9˝ “Finished” (Painted) Accessory (Uninsulated) Closed Pipe Tunnel
Unit Configuration Type AL
Lintel (By Others)
Intake Louver
Important:Gasket sealing surface is required.
Sash Piping
Painted Insulated Closure Plate Accessory
Floor Line
Accumulated moisture can cause property damage if not properly drained. Installing contractor must provide such drainage.
Sealed Cement Mortar;Pitch AwayFrom Unit
Lintel(By Others)
1"(25mm)
Sealed Cement Mortar;Pitch AwayFrom Unit
Sealed Cement Mortar;Pitch AwayFrom Unit
1"(25mm)
1"(25mm)
CAUTION
Page 6 of 58 IM 817-2
Figure 15 – The 217/8” (556mm) Deep Full Adapter Back Unit with Closed Pipe Tunnel, Ducted with Top Intake
Figure 16 – 217/8" (556mm) Deep Partial Adapter Back Unit with Open Pipe Tunnel
Intake Louver
Not More Than 12"
Unit Configuration Type AP Unit Configuration Type AK
Figure 13 - 217⁄8" (556mm) Deep Full Adapter Back Unit With Standard Louver Application
Figure 14 - 217⁄8" (556mm) Deep Full Adapter Back Unit with High Louver Application
Not MoreThan 28"(711mm)
Unit Configuration Type AN
Louver
Piping
Important:Gasket sealing surface is required.
Lintel(By Others)
Piping
Floor Line
Sealed Cement Mortar; Pitch Away From Unit
Important:Gasket sealing surface is required.
Louver
Lintel (By Others)Piping
Piping
Important:Gasket sealing surface is required.
Piping
Piping
Important:Gasket sealing surface is required.
Louver Installation With Typical Unit Configurations
Lintel(By Others)
Gasket Seal
Intake Louver
Piping
Piping
Window Sash
“Goose Neck”Insulated Duct (By Others)
Duct Collar (By AAF)
Note:Arrangement AB with full metal back panel, similar to configuration type AN. (Outside air opening to be cut and sealed by others.)
Floor Line
Floor Line
Floor Line
1"(25mm)
1"(25mm)
Sealed Cement Mortar;Pitch AwayFrom Unit
Sealed Cement Mortar;Pitch AwayFrom Unit
IM 817-2 Page 7 of 58
Installing Louvers Typical Installation MethodsIf the fresh air opening has not yet been made, see figures 9 through 16 for the recommended locations and the job-specific plans for the exact location.Followlocalcodes.
Cutthewallopeningsothatitisslightlylargerthanthelouverbeinginstalled.Fordimensions,seeTable3.Iftheopeningisalreadythere,measuretobesurethereisaminimumof3/8"(9mm)clearancearoundallsides.Formasonryinstallations,a lintelmustbeinstalledabovealllouvers.
Inthickwallapplications,theportionofthewallbetweenthelouverandtheunitistheoutsideairplenum.Linethisplenumareawith3/8"(9mm)mortarorothersuitablematerial.Insomeapplications,thejobspecifications require a metal sleeve connection between the louver and theunit.Ifusingsuchasleeve,properlycaulkittoensureaweather-tightseal.Thisiscriticalinpreventingfreeze-ups,colddrafts,andairinfiltration. Be sure the wall is smooth, square, and provides a suitable matingsurface.
Beforesettingthelouver,constructasloping,sealedcementmortarbaseto drain unwanted moisture to the outside, (see figure 17). Be sure the mortarbaseis1"(25mm)thickattheunitandtaperstowardthelouver.Themortarattheunitalsoactsasabackingagainstwhichtheopencellgasketoftheunititselfcanseal.Thisiscriticalinpreventingwaterleaksandairleaksundertheunit.Besurethesealedcementmortarbase is smooth and flush with the interior wall.If it is not possible to construct a sloping mortar base, then field-supplied flashing is required. See figure 18. The flashing should terminate flush withtheexteriorofthebuilding.Placeabeadofcaulkunder the flashing
topreventmoisturefromwickingbacktotheunit.Donotcaulkthejoint between the louver and the flashing. This joint is designed to let unwantedmoistureescape.
Personal injury hazard. Wear protective gloves to avoid possible cuts and abrasions from exposed edges. Avoid contact with sharp edges.
See figures 6 through 19. Before setting the louver, be sure the drain lip(verticallouver)areatthebottom,horizontallouverbladesfacedown and the bird screen is towards the unit. See figures 20 and 21. Placeaheavybeadofcaulkalongthetopandthetwoverticalsidesofthelouver,leavingthebottomuncaulkedsothatifmoisturegetsintotheareabetweenthelouverandtheunit,itcandraintotheoutside,unrestricted.
If the louver is supplied with flanges, (see figure 20) place an additional bead of caulk on the inside of the top and side flanges that come in contact with the building facade. Do not caulk the bottom flange. Placethelouverintheopeningandpushittightagainstthesuppliedbuilding,fasteningittotheexteriorofthebuildingusingfasteners(byothers)appropriate to theinstallation.Seal thetopandsideswithawaterproofcaulktomakeitweather-tight.Donotcaulkthebottomofthe louver; doing so might trap unwanted moisture behind the flange. (See figure 20)
If the louver is supplied with no flanges, (see figure 21) place the louver intheopeningsothatitisrecessedaminimum1/16"(2mm)beyondthe building facade or as directed in the architectural plans. If specified intheplans,securethelouverinthewallusingmechanicalfasteners(supplied by others) appropriate to the installation. (See figure 19 for suggestedfastening).Withthelouversolidlyinplace,runabeadofcaulkaroundtheperimeterofthelouvertosealitweather-tight.Donotplugtheweepholes(horizontallouver)orthedripline(verticallouver). This might restrict the flow of unwanted moisture to the outside (see figure 21) See figure 18. If flashing was used instead of the sloping mortar base, caulk the flashing where it meets the inside of the opening between the louverandtheunit.Thishelpspreventmoisturefromgettingundertheflashing and into the room.
Louver
NoCaulk
Unit Gasket
Wall Unit
1" (25mm)
Floor
Caulk(By Others)
Flashing(By Others)
Figure 18 - Typical Louver Installation with Flashing
Unit Gasket
Sealed Cement Mortar;Pitch AwayFrom Unit
Floor
WallUnitLouver
NoCaulk 1" (25mm)
Figure 17 - Typical Louver Installation with Sloping Sealed Cement Mortar Base
Table 3 - Recommended Wall Openings For Wall Louvers
Recommended Maximum Number of VentiMatic Wall Openings VentiMatic Shutters Shutter(s) B C For Wall Louvers Which Can Be Mounted Air Capacity On Standard Louver Maximum Length Height 24" Shutter 36" Shutter cfm L/s 24" 27" 245⁄8" 107⁄8" (610) (659) (613) (267) 1 0 500 236
36" 39" 365⁄8" 107⁄8" (914) (991) (918) (267) 0 1 750 354 48" 51" 485⁄8" 107⁄8" (1219) (1295) (1222) (267) 2 0 1000 472
60" 63" 605⁄8" 107⁄8" (1524) (1600) (1527) (267) 1 1 1250 590
72" 75" 725⁄8" 197⁄8" (1829) (1905) (1832) (495) 0 2 1500 708
CAUTION
Page 8 of 58 IM 817-2
Notes:1. Horizontal blade wall louver shown. Vertical blade wall louver also
available with Ventimatic shutter.2. Optional exterior grille matches unit ventilator wall louver in material
and design. Mounted on wall louvers.3. Optional steel interior wall grille should be used to conceal the interior
wall opening whenever the Ventimatic shutter is not located behind shelf cabinets or DraftStop enclosure. Hardware to mount the interior wall grille is not included.
Installing the VentiMatic Shutter AssemblyTheVentiMatic ShutterAssembly is mounted on an installed walllouver. For larger units with 100% ventilation air dampers, twoVentiMaticShuttersmaybemountedsidebysideonthesamelouver.See figure 24.
Thesizeandappearanceofthewalllouverswithorwithoutoptionalgrillesusedwiththeunitventilator,andtheVentiMaticShutter,areidentical.
WheninstallingVentiMaticShutter(s)onthewalllouver,makesureall moving parts are free to operate unobstructed and placed levelandplumbforproperoperation.Ifoptionalsteelinteriorwallgrilleisfurnished,installasshowninFigure22.
Figure 19 - Suggested method for fastening louver (without flange) inside wall opening .
Figure 22 - Louver , VentiMatic Shutter, Interior Wall Grille Details, Dimensions
As DirectedBy Architect
3⁄4" (19mm) Approx.
7"(178mm)
Cement Mortar
Steel Interior Wall Grille(Optional) See Note 3
125⁄8" (314mm)
3⁄4" (19mm) Approx.
BirdScreen
Do Not Block Drain Holes With Caulk or Mortar
NotLess
Than 9"(229mm)
Cement Mortar
C(see table 3, page 7)
Wall Opening
Louver (Bird Screen Not Shown)
Angle Iron(by others)
Room Side
Exterior
Caulk (top and 2 Sides)
Louvers
Drain Holes (Do Not Block)
Flange (4 Sides)
1" Minimum
Lintels (By Others)
Bird ScreenSealed Cement Mortar Pitched Away from Unit Toward Louver
Figure 20 - Vertical or Horizontal Blade Wall Intake Louver (Flanged) (Vertical Blade Shown)
Drain Holes (Do Not Block With Mortar or Caulking Materials
Bird Screen
Sealed Cement Mortar Pitched Away from Unit Toward Louver
1" Minimum
Figure 21 - Vertical or Horizontal Blade Wall Intake Louver (Recessed Without Flange) (Horizontal Blade Shown)
Lintels (By Others)
Louvers Aluminum Wall Louver Assembly With Bird Screen (See Note 1)
B(see table 3,
page 7)
SteelVentiMatic Shutter Assembly
41⁄8" (105mm)
237⁄8" (606mm)or
357⁄8" (911mm)
2" (51mm)
103⁄8" (264mm)
3" (76mm)
Decorative Exterior Grille Also Available (See Note 2, above)(Bird Screen not shown)
Figure 23 - Single VentiMatic Shutter & Wall Louver
Outside
▲
IM 817-2 Page 9 of 58
8"(203mm)
14"(356mm)
21"(533mm)
5"(127 mm)
5" (127 mm)
2-7/16"(62 mm)
7-1/4" (184 mm)
13"(330mm)
6-1/2"(165mm)
7" (178 mm)
1" (25 mm)
Before Setting the Unit in PlaceMovetheunitventilatortothecorrectlocation.SeeTable2,page3forapproximateshippingweights.Carefullyremoveunitventilatorfromwoodskid.Besuretoproperlydispose of the skid in accordance with local recycling rules andguidelines.
Removing Unit from the Skid Remove fasteners at each end which hold the unit to the skid andcarefullyslidethefrontoftheunitofftheskid(1).Tipunitforwarduntil the bottom of the slotted front kickplate is resting on the floor (2). Liftrearofunitoffoftheskidbytippingunitforwardwhilesupportingtheunitfromthefront,untilitispossibletoslideskidoutfromunderthe unit. GENTLY LOWER the rear of the unit to the floor (3).
Figure 26 - Front View with End Panels - Mounting Holes Locations
Mounting Holes
Figure 27 - Rear View without End Panels and Subbase - Piping and Electrical Knockout Locations and Dimensions
Knockout Opening Between Pipe Tunnel & End Compartment.
Rear Entry Area or Draftstop Opening Knockouts
Outdoor Air Intake Opening
End compartment Draftstop knockouts must be removed for proper Draftstop operation. (21-7/8" units only)
Size S07 = 48" (1219mm)Size S10 = 60" (1524mm)Size S13 = 72" (1828mm)Size S15 = 84" (2133mm)
Note:See Draftstop IM bulletin (IM 473) for suggested installation procedure.
Leakage of outdoor air wastes energy, causes drafts and erratic unit ventilator operation. Check the following details: At the correct unit ventilator location, examine the wall surface. Make sure that it is smooth, plumb, and perpendicular to the floor. The seals on the rear of the unit ventilator will take up the small irregularities found in normal masonry construction. If the wall is irregular or has mullions, install furring strips to provide a flush surface against which the unit ventilator can seal. If there are moldings on the floor/wall line, omit them behind the unit ventilator. Provide a sealing surface at the floor line. Install a seal pad under the unit to prevent air leakage. Install the unit ventilator against a wall made of non-combustible material, and on a floor made of non-combustible material. Floor must be level, unbroken and structurally strong to support the unit.
Aluminum Wall Louver Assembly with Bird Screen
(See Note 1) 3'' (76mm)
VentiMaticShutter Assembly
Center Cover103⁄8"(264mm)
Figure 24 - Two VentiMatic Shutters & Wall Louver
B(see table 3,
page 7)
Outside
Decorative Exterior Grille Also Available (See Note 2, page 8)(Bird Screen not shown)
Figure 25 - Removing Unit from Skid1. Carefully slide the front of the unit off the front of the skid.
2. While supporting unit from the front, slowly tip unit forward until bottom of kickplate is resting on floor. Lift skid slightly and GENTLY lower the rear of the unit to the floor while pulling skid back (DO NOT LET THE UNIT DROP).
Tip forward until kick-plate rests on floor
Kickplate
Approx. 10"
Mounting Holes, Piping and Electrical Knockout Locations & Dimensions
CAUTION
NOTICE
Page 10 of 58 IM 817-2
ProcedureIftheunithasacoolingcoil,checkthecondensatedrainpantobesureitslopesdowntowardthedrainstub-upend.Todoso,comparetherightandlefthanddrainpanendstoFigures30&31.Theendwiththeshallowlowerbracket(Figure30)isthelowendofthedrainpan.Toreversetheslopeofthedrainpandothefollowing:
1. Removethelowerbracketandupperplatefromeachendoftheunit, as shown in figures 30 and 31. This is done by removing the screwsineachwitha1/4inchnutdriver.
2. Reinstallthebracketsontheoppositeendoftheunit.
3. Verify thestandarddrainconnection isopenon the low(drain)endonly.Ifthedrainconnectionstub-outsatthehighendofthedrainpanareopen,sealthemwatertightwithsiliconesealerorsimilar.
4. Mountstaticequalizercovertolowendbracketofdrainpan.
Figure 28 - Condensate Drain Pan Connection Location
Left Hand Right Hand
7/8"(22 mm)O.D. Drain
7/8"(22 mm)O.D. DrainCondensate
Drain
11"(279 mm)
11"(279 mm)
Front V iew of End Compartment(Without End Panels)
4-3/4"(121 mm)
Personal injury hazard. Wear protective gloves to avoid possible cuts and abrasions from exposed edges. Avoid contact with sharp edges.
Figure 30 - Low End of Drain Pan (Drain End)
Overflow ConnectionStandard Drain Connection
1/4" hex head screws
Disconnect all electrical power before servicing unit to prevent injury or death due to electrical shock.
The drain pan has two (2) connections on each end; a standard drain connection and an overflow connection.
Reversing Drain Pan Slope
Figure 31 - High End of Drain Pan
Shallow Upper Plate
Deep Lower Bracket
Drain Pan
Overflow Connection Standard Drain Connection
1/4" hex head screws
To Clean the Drain Pan1. Remove the shallow and deep upper plates from the unit (see figures
29and30).2. Spraywaterintothedrainpanonthehighendtowashdebristo
thelowend(drainend).3. Remove any debris, making sure that the drain holes are not
obstructed.4. Wipethedrainpanwithacloth.5. Reinstalltheupperplates.
Deep Upper Plate
Shallow Lower Bracket
DANGER
CAUTION
NOTICE
Deep Upper Bracket
Static EqualizerCover
Coil Connections
Drain Pan
ShallowLowerBracket
Figure 29 - Mount Static Equalizer Cover
IM 817-2 Page 11 of 58
Figure 32 – Typical Classroom Unit Ventilator Installation And Louver Details (see installation section for typical warnings and cautions)
Figure 33 – Typical VentiMatic Shutter Assembly Installation (see installation section for typical warnings and cautions)
Unit GasketPipe Tunnel
Screws or Bolts (by others)
Weep Holes
Caulk Top And Two Sides Of Louver
Sealed Mortar Bed
Caulk
Weep Holes
Floor
Unit Insulating Blanket
Back Of Unit
Unit Bottom Gasket
Seal Under Unit
Bird Screen
Internal Column For Wall Bracing (By Others)
Unit Gasket
Louver
Unit Ventilator Out-door Air Opening
Outside
Roomside
Typical VentiMatic louver installation with shelving.
Outside
Roomside
VentiMatic Shutter Assembly
Building Wall
Typical Floor Unit Installation
Typical VentiMatic™ Shutter and Draftstop™ Installation
1" End Panel w/Cut Out
Lintel (by others)
Unit Outside Air Opening
Page 12 of 58 IM 817-2
Meeting IBC Seismic RequirementsAAF-HermanNelson unit ventilators can be specified, as follows, to meetInternationalBuildingCodeseismicrequirements:
• All components included in theseunit ventilators aredesigned,manufactured and independently tested, rated and certified to meet the seismic compliance standards of the International BuildingCode.
• Components designated for use in systems that are life safety,toxic, high hazard, combustible or flammable meet the on line, anchorage and load path requirements for life safety as defined in IBCsections1621.1.6,1621.3.3,1707.7.2.andIBCCommentary,VolumeII,section1621.1.6,IBCnotespertainingtothereleaseofhazardousmaterial.
• Allcomponentsusedaspartofasystemotherthantheabovemeetasaminimum,allloadpathandanchoragestandardsforcomponentsasoutlinedinIBCsection1621.3.3&1707.7.2.
• All completed component assemblies are clearly labeled for field inspection.SeismicComplianceLabelsincludethemanufacturer’sidentification, designation of certified models, definitive information describing the product’s compliance characteristics, and theIndependent Certifying Agency’s name and report identification.
In addition to all seismic requirements for IBC Certification listed elsewhere in the project specification, submittals for these units include:
1. A Certificate of Compliance from the Independent Certifying Agency clearly indicating that components supplied on thisproject are included in the component manufacturer’s Certificate ofCompliance.
2. Clearinstallationinstructionsincludingallaccessorycomponentsthatarepartoftheoverallcomponentinstallation.
(4) - 3/8" diam. x (dimension “Y”) galvanizedthreaded rod (by others) - align with unitmounting holes, and set into building structuremortar or structural support column (see detail).
(4) - 1-1/2" O.D. x (dimension “X”),galvanized steel pipe (by others),gives rigidity to the unit in relationwith the building structure (see detail).
(4) - 3/8" galvanized nut withwasher (by others), attach frominside unit end compartments.Tighten nut until steel pipe iscompressed between unit andbuilding structure or column.
Lintel(by others)
Building structure or support column
Gasket on back of unit
Top mounting holeon unit frame
1-1/2" O.D.galvanizesteel pipe
Y
X
NOTE: Dimensions “X” and “Y” to be determined by installingcontractor based on fit up requirements of job.* A Molly or Toggle bolt may be necessary if voids in the building
structure or support columns are present.
*
DETAIL
Figure 34 - Typical IBC Seismic Installation
IM 817-2 Page 13 of 58
Make Piping Connections
Be sure the hot and chilled water supply and return system are thoroughly flushed and cleaned before connecting piping to the unit ventilator. Debris in the lines can damage the unit.
For All SystemsBesure to install thecontrolvalve(s)onthecorrectunitventilator.Indiscriminate mixing of valves in the field can result in valves improperly sized for the desired flow rate, which can result in poor operationandcoilfreezeups.Installcontrolvalvesothereisatleast2"(51mm)minimumclearancetoremovetheactuatorfromthevalvebody.Becertainthatthecontrolvalveisinstalledcorrectly,withitsorientationvertical.Valvesshouldbeinstalledatleast5ooffcenter.
Be certain that the control valves are installed with the proper port orientation to provide proper flow and fail safe operation. Incorrect installation can result in improper unit operation, and/or the possibility of coil freeze-up.
With future servicing considerations in mind, use standard, field-supplied shutoffvalvesandunionconnections;thispermitseasyremovalofthecoilorcontrolvalveifservicingisrequired.
While brazing, have an extinguisher readily available. Wear appropriate eye and hand protection. Ensure all areas with shared ventilation have ample fresh air ventilation.
Properventilationisrequiredforbrazing.Whenbrazing,besuretoprotectunitventilatorcomponentsfromoverheatingdamage(meltinginsulation,alsodamagetovalves,wiring,electronics,sensors,etc.).Before filling, be sure to flush all piping adequately so that all debris isremoved.Debriscanpreventpropervalveoperation,resultinginoverheating,overcooling,etc.Ensureproperinsulationofsupplyandreturnpiping.Properinsulationpreventslossofunitventilatorcapacity,overheatingofendcompartment,and/ormoisturedripping.Thepipingtoandfromtheunitmustbeprotectedfromoutsideairandfreezeconditions.Thepipingmustbesuitablyinsulatedforcondensationorheatloseorgain.Penetrationsenteringtheunitendcompartmentsmust be fitted/sealed for unit integrity.
Refer to figure 32 and figures 26 and 27 and attach the unit ventilator to the wall through the four (4) mounting holes provided, using field-suppliedfastenersappropriatetothewallconstructionandthewashersprovided in the brown envelope with these instructions (figure 37). Envelopealsocontainsallenwrenchtoprovideaccesstounit.Pushtheunitventilatortighttothewallstructuresothattheoutdoorairsealsarecompressed.Securethewallfastenerstopreventtheunitventilatorfrommovingandtippingover.
Remove moldings behind unit
Unit must be anchored to an internal wall column or other suitable support (see figure 32, page 11)
Figure 36 - Setting The Unit Ventilator In Place
Figure 35 - Leveling Legs Location
Figure 37 - Shipping Envelope Contents.Unit Ventilator InstallationBefore setting the unit ventilator in position, be sure that field-supplied electrical connections are in place, de-energized and in accordancewiththeplans.Movetheunitventilatorintopositionagainstthewallsurface.Checktoseethattheunitventilatorislevelfromendtoendandbacktofront.Usinga4'levelisrecommended.Levelingboltsarelocatedateachend of the front kickplate (see figure 35).
CAUTION
CAUTION
WARNING
CAUTION
Page 14 of 58 IM 817-2
For Water SystemsAfter flushing piping adequately, so all debris is removed, fill the system.
Atinitialoperation,ventmanuallybyunscrewingtheventplugoneortwo turns, figure 41. After venting, tighten the vent plug firmly.
Water system under pressure. Keep face and body parts well away from vent.Unscrew the vent plug only one or two complete turns, and vent slowly. Water pressure can result in severe personal injury.
Use piping shut off valves and connection unions for future servicing to the coil supply and return stubs, instead of hard piping. This permits easy removal of the coil or control valve if servicing is required.
Figure 41 - Vent and Drain Plug
Unscrew the vent plug one or two turns to manually vent system.
Figure 38 - Hot Water Coil Connections
Chilled Water Coil
Hot Water Coil
Chilled Water Return
Chilled Water Supply
Hot Water Return
Hot Water Supply
Water Coil ConnectionsHookupwaterpipinginaccordancewithFigure38and39forhotwaterandchilledwatercoilconnections.
Figure 39- Chilled Water Coil Connections
Failure to install water piping to coils properly can result in improper unit operation and coil freeze-ups.
Figure 40 - Protect Components From Overheating Before Brazing
Use A Quenching Cloth When Brazing, to Prevent Overheating The Piping Components (Avoid Valve D a m a g e a n d E r r a t i c Operation)
Vent
Drain Plug
2-pipe Chilled Water/Hot Water SystemsAftermakingthepipingconnections,securelyattachandinsulatethewater-in temperature sensor (S5) to thewatercoil supply line.Thesensorshouldbe locatedon thewatersupply line inanareawherethere is continuous water flow. The sensor hangs loose in the same endcompartmentasthecoilconnections.Thissensormustbeattachedcorrectlyforproperunitoperation.
After BrazingInstall provided donut shaped insulation seals around pipe fittings, by removingwhitebacking.Presssealsuptocoilpartitiontosealgapsinpartitioninsulation.
Donut insulation seals must be installed for proper air flow through the coil.
Consider addingpiping unionsfor future servicing(by others)
Consider addingpiping unionsfor future servicing(by others)
Air Flow
Air Flow
CAUTION
NOTICE
CAUTION
WARNING
IM 817-2 Page 15 of 58
R
S
J
A
B B
8-1/2"(216mm)
13-3/4"(349mm)
J
A
13-3/4"(349mm)
8-1/2"(216mm)
Air Flow Air Flow
R
S
R
S
16-1/8"(410mm)
11"(279mm)
Air Flow
R
S
16-1/8"(410mm)
J
11"(279mm)
K
H
Air Flow
J
K
H
R
S
J
A
B B
8-1/2"(216mm)
13-3/4"(349mm)
J
A
13-3/4"(349mm)
8-1/2"(216mm)
Air Flow Air Flow
R
S
78 = Opposite End Drain Low Capacity Steam Coil79 = Opposite End Drain High Capacity Steam Coil12 = Low Electric Heat Coil13 = High Electric Heat Coil
Heating Coils00 = None
Cooling CoilsV = 2-Row CW CoilS = 3-Row CW CoilW = 4-Row CW CoilG = Direct Expansion CoilY = 5-Row CW Coil
Heating OnlyFigure 42 - Hot Water Heating Only Unit (Coils 65, 66, 67)
Cooling Only
Unit Series S07 S10 S13 S15 Suction Line O.D. (in/mm) 3⁄4 19 3⁄4 19 7⁄8 22 7⁄8 22 Liquid LIne O.D. (in/mm) 1⁄4 6.35 1⁄4 6 3⁄8 10 3⁄8 10
Notes:1. All coils have same end supply and return connections.2. Steam coils have a factory installed pressure equalizing valve and
a 24" (610mm) long pressure equalizing line which terminates in a 1⁄2" M.P.T. fitting.
3. Steam/hot water connections may be same end as cooling coil connections, but they are recommended to be opposite end to facilitate piping. (Must be opposite end when using AAF controls.)
4. Cooling condensate drain pan is shipped sloped down towards the cooling coil connections but is field reversible.
5. Electric heating coil power connections are right end only. Junction box has 1"(25mm) and 2" (51mm) (trade size) knockouts, 101⁄2" (267mm) from right end of the unit.
6. For limitations with coil combinations see tables 4, 5, 8 and 9.7. Coil stubs are 7⁄8" I.D. (female) and terminate 9" (229mm) from the
end of the unit.8. Steam coils are 11⁄8" female (sweat) connections and terminate
9” (229mm) from the end of the unit.9. DX coils (G) have O.D. sweat connections. Interconnecting tube
by others. See table 7 for correct tubing size.
Table 6 - Dimensions
Table 7 - DX Coil (G) Connection Tubing
L.H. Connections
Electric Heating Only
S = Supply R = Return
R.H. Connections L.H. Connections R.H. Connections R.H. Connections
Table 4 - Heating Only – Coil Position/Combinations In Air Stream (one coil per position) Note: X indicates Available. Face and Bypass Valve First Position in Air Stream Second Position in Air Stream AVS AVV AVV Elect.. 65 66 67 68 69 78 79 Z X X 12 13 Z X
Heating Coils65 = 1-Row Hot Water Coil66 = 2-Row Hot Water Coil67 = 3-Row Hot Water Coil68 = Low Capacity Steam Coil69 = High Capacity Steam Coil
Cooling CoilsZ = None
Table 5 - Cooling Only – Coil Position/Combinations In Air Stream (one coil per position) Note: X indicates Available. Face and Bypass Valve First Position in Air Stream Second Position in Air Stream AVS AVV Y V S W 00 X X G 00 X
L.H. Connections
Figure 45 - Chilled Water Only Unit (Coils S, W, V) Figure 46 - Direct Expansion Cooling Only Unit (Coil G)
R.H. Connections L.H. Connections R.H. Connections
Note: For opposite end drain steam coils (code 78,79) Return (R) is 71⁄4"(184mm) from bottom of unit and H - 2"(51mm) from back of unit.
Figure 43 - Steam Heating Only Unit (Coils 68, 69, 78, 79)
Figure 44- Electric Heating Only Unit (Coils 12, 13)
Coil Headers, Locations
S = Supply R = Return
J
Air Flow
14"(356mm)
L
Junction Box
Unit Dimensions Depth A B C D E F G H I J K in 165⁄8 33⁄4 121⁄4 47⁄8 73⁄4 15⁄8 101⁄8 23⁄4 27⁄8 55/8 3 5
mm 422 95 311 124 198 41 257 70 73 143 76 127 in 217⁄8 9 171⁄2 101⁄8 13 67⁄8 153⁄8 8 81⁄8 107⁄8 81⁄4 101⁄4 mm 556 229 445 257 330 175 391 203 206 276 210 260
S = Supply R = Return
LL
SL
J
D
C
7-1/4"(184mm)
Air Flow
11-3/4"(299mm)
LL
SL
J
B
Air Flow
13-3/4"(349mm)
11-3/4"(299mm)
D
Page 16 of 58 IM 817-2
Face and Bypass Valve First Position in Air Stream Second Position in Air Stream AVS AVS Elect.. AVV AVV Elect.. F U D E 00 X X 65 66 67 V S X X 65 66 W X X 65 66 67 G X X G 12 13 X V S W 12 13 X V S W 12 X G V S 68 69 78 79 X X 65 Y X X
Heating Coils65 = 1-Row Hot Water Coil66 = 2-Row Hot Water Coil67 = 3-Row Hot Water Coil68 = Low Capacity Steam Coil69 = High Capacity Steam Coil78 = Opposite End Drain Low Capacity Steam Coil79 = Opposite End Drain High Capacity Steam Coil12 = Low Electric Heat Coil13 = High Electric Heat Coil00 = None
R
S 13-3/4"(350mm)
A
B
J8-1/2"
(216mm)
Air Flow
14"(356mm)
L
Junction Box
Chilled Water and Heating Coils
See Notes and Tables 6 and 7 on page 15
Table 8 - Heat/Cool Position/Combinations In Air Stream (one coil per position) Note: X indicates Available.
Cooling CoilsU = 2-Row CW/HW 2-Pipe CoilD = 3-Row CW/HW 2-Pipe CoilE = 4-Row CW/HW 2-Pipe CoilF = 5-Row CW/HW 2-Pipe CoilV = 2-Row CW CoilS = 3-Row CW CoilW = 4-Row CW CoilY = 5-Row CW CoilG = Direct Expansion CoilY = 5-Row CW Coil
Left Hand
Figure 47 - Chilled/Hot Water (2-pipe) Unit (Coils D, E, U)
Figure 48 - Chilled Water and Hot Water Unit(Cooling Coils S, W, V) (Heating Coils 65, 66, 67)
Figure 49 - Chilled Water and Steam Unit(Cooling Coils S, V) (Heating Coils 68, 69, 78, 79)
Figure 50 - Direct Expansion (G) and Hot Water Unit(Cooling Coil G) (Heating Coils 65, 66, 67) (Not Reheat)
Figure 51 - Direct Expansion (G) and Steam Unit(Cooling Coil G) (Heating Coils 68, 69, 78, 79)
Figure 52 - Direct Expansion and Electric Heating(Cooling Coils G) (Heating Coils 12, 13)
Right Hand
Right Hand
(Cooling) Left Hand (Heating) Right Hand
Figure 53 - Chilled Water (1st Position) and Electric Heating(Cooling Coils V, S, W) (Heating Coils 12,13)
Right Hand
Note: For opposite end drain steam coils (code 78,79) Return (R) is 71⁄4" (184mm) from bottom of unit and H - 2" (51mm) from back of unit. (see table 6 for dimensions)
Coil Headers, Locations
Direct Expansion Coils and Heating Coils (See Table 7 for Direct Expansion (DX) Coil)
(Cooling) Left Hand (Heating) Right Hand
(Cooling) Left Hand (Heating) Right Hand (Cooling) Left Hand (Heating) Right Hand
R
S
J
A
B B
8-1/2"(216mm)
13-3/4"(349mm)
J
A
13-3/4"(349mm)
8-1/2"(216mm)
Air Flow Air Flow
R
S R
S13-3/4"
(350mm)
A
B
J8-1/2"
(216mm)
R
S 16-1/8"(410mm)
E
F
J
11"(279mm)
Air FlowAir Flow
R
S 13-3/4"(350mm)
J8-1/2"
(216mm)
R
S
16-1/8"(410mm)
A
B
J
11"(279mm)
K
H
Air FlowAir Flow
LL
SL 14-1/4"(368mm)
J
9-3/4"(248mm)
R
S
8-1/2"(216mm)
Air Flow
13-3/4"(349mm)
LL
SL
14-1/4"(368mm)
J
B
R
S
A
Air Flow
16-1/8"(410mm)
I
8-1/2"(216mm)
B
F
A
G13-3/4"
(349mm)
I
LL
SL
14-1/4"(368mm)
J
10-1/8"(257mm)
D
C
R
S
H
K
7-1/4"(184mm)
Air Flow
11-3/4"(299mm)
LL
SL
14-1/4"(368mm)
J
B
R
S
H
K
10-1/8"(257mm)
Air Flow
13-3/4"(349mm)
11-3/4"(299mm)
D
14"(356mm)
L
Junction Box
LL
SL
J
D
C
7-1/4"(184mm)
Air Flow
11-3/4"(299mm)
S = Supply R = Return
S = Supply R = Return
S = Supply R = Return
IM 817-2 Page 17 of 58
LL
SL
J
C
7-1/4"(184mm)
Air Flow
LL
SL
J
B
Air Flow
13-3/4"(349mm)
11-3/4"(299mm)
D
R
S
16-1/8"(410mm)
11"(279mm)
K
H
LL
SL
J
C
7-1/4"(184mm)
Air Flow
LL
SL
J
B
Air Flow
13-3/4"(349mm)
11-3/4"(299mm)
D
R
S
16-1/8"(410mm)
E
F
11"(279mm)
R
S 13-3/4"(350mm)
J8-1/2"
(216mm)
R
S
16-1/8"(410mm)
A
B
J
11"(279mm)
K
H
Air FlowAir Flow
13-3/4"(350mm)
A
B
8-1/2"(216mm)
R
S
J
Air Flow
R
S
J
16-1/8"(410mm)
E
F
11"(279mm)
Air Flow
Face and Bypass Valve First Position in Air Stream Second Position in Air Stream AVB AVR AVR Elect.. V S 65 66 67 68 69 78 79 X X W 65 66 X X G 65 66 67 68 69 78 79 X G 12 13 X V S W 12 13 X Y 65 X X
Reheat
Table 9 - Reheat Coil Position/Combinations In Air Stream (one coil per position) Note: X indicates Available.
Heating Coils65 = 1-Row Hot Water Coil66 = 2-Row Hot Water Coil67 = 3-Row Hot Water Coil68 = Low Capacity Steam Coil69 = High Capacity Steam Coil78 = Opposite End Drain Low
Capacity Steam Coil79 = Opposite End Drain High
Capacity Steam Coil12 = Low Electric Heat Coil13 = High Electric Heat Coil
Cooling CoilsV = 2-Row CW CoilS = 3-Row CW CoilW = 4-Row CW CoilY = 5-Row CoilG = Direct Expansion Coil
Figure 57 - Direct Expansion (G) and Hot Water Unit (Cooling Coil G) (Heating Coils 65, 66, 67)
Figure 58 - Direct Expansion (G) and Steam Unit (Cooling Coil G) (Heating Coils 68, 69, 78, 79)
Figure 54 - Chilled Water and Hot Water Unit(Cooling Coils S, W, V) (Heating Coils 65, 66, 67)
Figure 55 - Chilled Water and Steam Unit(Cooling Coils S, V) (Heating Coils 68, 69, 78, 79)
Figure 56- Chilled Water and Electric Heating (Cooling Coils V, S, W)(Heating Coils 12, 13)
Figure 59 - Direct Expansion and Electric Heating (Cooling Coils G) (Heating Coils 12, 13)
S = Supply R = Return
S = SupplyR = ReturnLL = Liquid LineSL = Suction Line
Right Hand
Right Hand
Note: For opposite end drain steam coils (code 78,79) Return (R) is 71⁄4˝ (184mm) from bottom of unit and H - 2˝ (73mm) from back of unit.
Coil Headers, Locations
S = Supply R = Return
S = SupplyR = ReturnLL = Liquid LineSL = Suction Line
(Cooling) Left Hand (Heating) Right Hand (Cooling) Left Hand (Heating) Right Hand
(Cooling) Left Hand (Heating) Right Hand (Cooling) Left Hand (Heating) Right Hand
R
S 13-3/4"(350mm)
A
B
J8-1/2"
(216mm)
Air Flow
14"(356mm)
L
Junction Box
14"(356mm)
L
Junction Box
LL
SL
J
D
C
7-1/4"(184mm)
Air Flow
11-3/4"(299mm)
Page 18 of 58 IM 817-2
Typical Valve PackagesTheoptionalfactory-suppliedAAF®-HermanNelson®ControlValve(s)forwaterapplicationscanbeeither2-wayor3-waytype,andis/areshippedseparatefromtheunitventilatoritselftohelpavoidshippingdamagetothepipingoftheconnectionstubfromtheweightofthevalve, and to provide the installer with maximum flexibility in making the field piping connection. Before proceeding, see figures 60 through 84 as applicable, as well as the job-specific piping drawings. Notes:1. See label furnished on 2-way valve to determine direction of flow
through the valve.
2. Adhere to the port orientation shown for the 3-way valve.
3. For hot water applications and chilled water/hot water (2-pipe) applications, the 2-way valve furnished is normally piped open to the coil; the 3-way valve is piped normally open to the coil.
4. For chilled water applications, the 2-way valve furnished is normally piped closed to the coil; the 3-way valve is piped normally closed to the coil.
5. The 3-way valve is generally selected for diverting water back to the return main, where a constant pump head pressure is required.
6. All water coil stubs are 7/8" I.D. female sweat. Coil connections terminate 9" (229mm) from the end of the unit. Hot water connections may be same end as cooling coil connections, but are recommended to be at opposite ends from each other. When using MicroTech II controls, they must be at opposite ends.
Face and Bypass – MicroTech II™ 2-Way and 3-Way End-of-Cycle Valves
Control 2 Position Electrical 24 VAC, 50/60 Hz Stroke Power Stroke 9 to 11 seconds Spring return 4 to 5 seconds Ambient 32oF to 125oF (0oC to 52oC)
Connections 3⁄4" FNPT Static Pressure 300 psi (2100 kPa) Close-Off Pressure 13 psi (90 kPa) Temperature 32oF to 200oF (0oC to 93oC)
Connections 3⁄4" FNPT, 1" FNPT Static Pressure 300 psi (2100 kPa) Close-Off Pressure 13 psi and 15 psi (90 kPa and 103 kPa) Temperature 32oF to 200oF (0oC to 93oC)
Control 2 Position Electrical 24 VAC, 50/60 Hz Stroke Power Stroke 9 to 11 seconds Spring return 4 to 5 seconds Ambient 32oF to 125oF (0oC to 52oC)
Table 10 - 2-way Actuator
Table 11 - 2-way Valve Body
Table 12 - 3-way Actuator
Table 13 - 3-way Valve Body
Table 14 - EOC Connection
Figure 61 - 3-way End of Cycle Valve
Figure 60 - 2-way End of Cycle Valve
Connection Cv X Y Z
3⁄4"(19mm) FNPT 7.0 111⁄16" (43mm) 11⁄16" (23mm) 35⁄8" (92mm)
*1"(25mm) FNPT 7.0 17⁄8" (47mm) 1" (25mm) 311⁄16" (94mm)
* 1" valve for steam only
IM 817-2 Page 19 of 58
2-Way and 3-Way Modulating Valves – MicroTech II™
Control Floating Point Modulating Electrical 20 to 30 VAC at 50/60 Hz or 24 VDC ± 10% Transformer 12 VA (class 2 power source) Stroke 29/32 in. (23mm) max. 76 seconds Spring Return 4 to 9 seconds at room temperature (stem up) Operating Temperature 35 to 250oF (2 to 121oC); 15 psig (103 kPa) saturated steam
ThemodulatingcontrolvalvesforMicroTechIIaredesignedtoregulatethe flow of hot water, chilled water and steam. They consist of a bronze body valve with a spring return, floating point actuator. The optional valve accessory is shipped separate from the unit ventilator for field installation to prevent shipping damage and to provide flexibility in making the field piping connection.
Figure 62 - 2-Way and 3-Way Modulating Valve Actuators
Table 16. Valve Body Specifications 400 psig (2.756 ,PA) up to 150oF Water (66oC) decreasing to 365 psig Static (2,515 kPa) at 248oF (120oC)
Pressure 38 psig (262 kPa) Saturated steam at
Steam 284oF
Fluid Temperature
35 to 250oF (2 to 121oC); 15 psig (103kPa) saturated steam
Table 15. Actuator Specifications
2-WayModulatingValve 3-WayModulatingValve
Valve Size, in. (DN) A B C
N.O./N.C./Three Way 2-Way N.O. 2-Way N.C. Three-Way
1/2 (DN15) 3 13/16 1-9/16 1-3/16 8
(76) (21) (39) (46) (203)
3/4 (DN20) 3-7/32 15/16 1-5/8 2-1/8 8
(81) (24) (41) (54) (203) 1 4-1/8 1-5/32 1-3/4 2-9/16 9-7/32 (DN25) (119) (29) (44) (65) (234) 1-1/4 4-23/32 1-11/32 2 2-25/32 9-7/32 (DN32) (119) (34) (51) (70) (234)
2-Way Modulating Valve
3-Way Modulating Valve
Modulating Valve Specifications – MicroTech II™
Table 17. 2-Way and 3-Way Modulating Valve Dimensions
4-3/32"(104mm)
3-5/32"(80mm)
6-13/16"(173mm)
AB
C
3-19/32"(91mm)11/32"
(8mm)
4-3/32"(104mm)3-5/32"
(80mm)
6-13/16"(173mm)
AB
C
3-15/16"(100mm)11/32"
(8mm)
Figure 63
Figure 64
Page 20 of 58 IM 817-2
ValveInletPressure Cv Connection 2psig 5psig 13.8kPa 34.5kPa CapacityRange(MBh) CapacityRange(kW) 0.73 1/2"(13mm)FNPT 11 14 18 22 3.2 4.0 5.2 6.3 1.8 1/2"(13mm)FNPT 27 34 44 53 7.8 9.9 12.9 15.6 4.6 1/2"(13mm)FNPT 68 86 112 136 20.1 25.2 32.9 39.9 7.3 3/4"(19mm)FNPT 109 137 178 216 31.8 40.0 52.2 63.3 11 1"(25mm)FNPT 164 206 269 325 48.0 60.3 78.7 95.4 18.5 11/4"(32mm)FNPT 275 346 452 547 80.7 101.4 132.4 160.4
Steam Modulating Valve Selection (MicroTech II™)Thesteammodulatingcontrolvalveisexpectedtovarythequantityofsteamthroughthecoil.Anymovementof thevalvestemshouldproduce some change in the steam flow rate. To select a modulating steamvalve:1. Obtainthesupplysteaminletpressure.2. Determinetheactualheatrequirementofthespacetobeheated.
3. Selectavalve(Cv)fromTable18,whichgivesthecapacityrangebasedona60%pressuredropatthelowendoftherangeand100%pressuredropatthehighendoftherange.Forexample:With2psig(13.8kPa)inletsteampressure,thevalvewithaCvof4.6,inthefullopenposition,wouldhavea1.2psig(8.3kPa)pressuredropat68MBh(20.1kW)anda2psigpressuredropat86MBh(25.2kW).Thevalveshouldhaveacapacitylessthanorequaltothespacetobeheated.
Table 18. Modulating 2-Way, Normally Open, Steam Valve – Pressure Drop
Hot Water and Chilled Water Modulating Valve Selection (MicroTech II)Theunitventilatorcontrolvalve is expected tobeable tovary thequantity of water that flows through the coil in a modulating fashion. Anymovementofthevalvestemshouldproducesomechangeintheamount of water that flows through the coil. Oversized control valves cannotdothis.Forexample,assumethatwhenthecontrolvalve isfullyopen,thepressuredropthroughthecoilistwiceasgreatasthedropthroughthevalve.Inthiscase,thecontrolvalvemusttraveltoapproximately 50% closed before it can begin to have any influence on the water flow through the coil. The control system, no matter how sophisticated,cannotovercomethis.Oversizedcontrolvalvescanalsoresult in “hunting” which will shorten the life of the valve and actuator andpossiblydamagethecoil.
TocorrectlyselecttheproperHotWaterorChilledWaterModulatingValve:1. Determine the flow of water and the corresponding pressure drop
throughthecoil.2.Obtainthepressuredifferencebetweenthesupplyandreturn
mains.3.Selectavalvesize(Cv)fromTable19onthebasisoftaking50%
of the available pressure difference (at design flow) between the supplyandreturnmainsatthevalvelocation.Thevalveshouldhaveapressuredropgreaterthanthatofthecoil.
4.Selectanormallyopenvalveforhotwater,or2-pipeCW/HWcoils.Forchilledwatercoilsselectanormallyclosedvalve.
Table 19. 2-Way and 3-Way Modulating Valve Pressure Drop (Hot Water and Chilled Water)
WaterFlowRatesGPM(L/s) Cv Connection Recommended Valve 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 FlowRates PressureDrop (.13) (.19) (.25) (.32) (.38) (.44) (.51) (.57) (.63) (.64) (.76) (.82) (.88) (.95) (1.01) (1.07) (1.13) (1.20) (1.26)
0.73 1/2" (13mm) 2 GPM to 3 GPM WPD Ft of H2O 17.3 38.8 – – – – – – – – – – – – – – – – –
(.13 L/s) to (.19 L/s) (kPa) (51.6) (116)
1.8 1/2" (13mm) 2 GPM to 7 GPM WPD Ft of H2O 2.8 6.4 11.4 17.7 25.6 34.8 – – – – – – – – – – – – –
(.13 L/s) to (.44 L/s) (kPa) (8.5) (19.1) (34.0) (53.1) (76.4) (104)
4.6 1/2" (13mm) 5 GPM to 16 GPM WPD Ft of H2O – – – 2.7 3.9 5.3 7.0 8.8 10.9 13.2 15.7 18.4 21.3 24.5 27.8 – – – –
(.32 L/s) to (1.0 L/s) (kPa) (8.1) (11.7) (15.9) (20.8) (26.3) (32.5) (39.3) (46.8) (54.9) (63.7) (73.1) (83.2)
7.3 3/4" (19mm) 9 GPM to 20 GPM WPD Ft of H2O – – – – – – – 3.5 4.3 5.2 6.2 7.3 8.5 9.7 11.0 12.5 14.0 15.6 17.3
(.57 L/s) to (1.3 L/s) (kPa) (10.5) (12.9) (15.6) (18.6) (21.8) (25.3) (29.0) (33.0) (37.3) (41.8) (46.6) (51.6)
Care must be taken with modulating valves to provide proper water flow. In freezing conditions, water flow must be maintained through the heating coil or a suitable freeze-prevention solution employed to prevent freeze-up. Similarly, the cooling coil must be drained or a suitable freeze-prevention solution employed.
Normally Open (Stem Up) – Push Stem Down to CloseNormally Closed (Stem Up)– Push Stem Down to Open
Note:The actuator spring returns the valve to the stem up position when the actuator is de-energized (off)
White/Brown (Stem Up)
Yellow (24 VAC Supply)
Brown (Stem Down)
White (Common)
Locating Rib
Figure 65 - Actuator Wiring
Note: The actuator plug-in wiring for the Steam Valve is the same as the Hot Water and Chilled Water Modulating Valve. (see figure 65 )
5.Selecteithera2-wayor3-waymodulatingvalve.The3-wayvalveisgenerallyselectedfordivertingwaterbacktothereturnmainwhereaconstantpumpheadpressureisrequired.
CAUTION
IM 817-2 Page 21 of 58
The2-wayEOCCWvalveisfurnishednormallyclosedtothecoil.When the valve is de-energized (off) there is no flow through the coil. Energizing the valve allows flow through the coil.
The3-wayEOCCWvalveisfurnishednormallyclosedtothecoil.Whenthe valve is de-energized (off) the flow bypasses the coil. Energizing the valve allows flow through the coil.
Figure 68 - 2-way EOC, Normally Closed, Chilled Water Valve Piping
Figure 69 - 3-way EOC, Normally Closed, Chilled Water Valve Piping
Return
Return
Balancing and Shutoff Valve
Shutoff Valve
Supply
Supply
2-way EOC Valve Unit Coil
Unions
A B
Return
Return
Supply
Unit Coil
Union
Shutoff Valve
Supply
3-way EOC Valve
Union
Bypass
A B
AB
Balancing Valve
Cooling – Chilled Water EOC Valve Piping
Balancing and Shutoff Valve
The2-wayEOChotwateror2-pipeCW/HWvalveisfurnishednormallyopen to the coil. When the valve is de-energized (off) there is full flow through the coil. Energizing the valve shuts off the water flow.
Figure 66 - 2-way EOC, Normally Open, Hot Water or 2-pipe CW/HW Valve Piping
The3-wayhotwateror2-pipeCW/HWvalveisfurnishednormallyopen to the coil. When the valve is de-energized (off) there is full flow throughthecoil.Energizingthevalveallowsthewatertobypassthecoil.
Figure 67 - 3-way EOC, Normally Open, Hot Water or 2-pipe CW/HW Valve Piping
Return
Return
Balancing and Shutoff Valve
Shutoff Valve
Supply
Supply
2-way EOC Valve Unit Coil
Unions
A B
Heating – Hot Water End of Cycle Valve Piping
S5 Sensor (2-pipe CW/HW Units Only)
Typical Piping ArrangementsHeatingvalveactuatorsshouldbemountedinanuprightpositionabovethecenterlineofthevalvebodyandshouldbepipednormallyopentothecoil.Modulatingvalveactuatorsforhotwaterapplicationsmaybepositionedabovethevalvebodyamaximumof75ofromthevertical.Forsteamapplicationsonly,mountthemodulatingvalveactuatorabovethevalvebodyat45o fromthevertical.Two-position,end-of-cycle(EOC)valvesusedwithfaceandbypassdampercontrolledunitsmaybepositionedabovethevalvebodyamaximumof85ofromthevertical.Allcontrolvalvesareshippedloosetohelpavoidshippingdamagetothepipingorthecoilconnectionstubfromtheweightofthevalve,andto provide the installing contractor with maximum flexibility in making the field piping connections. Refer to AAF®-HermanNelson®factoryinstructionsheetshippedwiththeunitforportorientationandapipingschematic.Controlvalvesmustbeinstalledontheunitsinwhichtheyareshipped.Indiscriminatemixingofvalvesamongunitscanresultin valves not properly sized for the desired flow rate. Control valves shouldbeinstalledsothatthereis2"minimumclearancetoremovetheactuatorfromthevalvebody.Asafutureserviceconsideration,provideunionsforremovaloftheunitcoiland/orthecontrolvalve.
Return
Return
Balancing and Shutoff Valve
Shutoff Valve
Supply
Supply
3-way EOC Valve
Unit Coil
Union
Balancing ValveBypass
AB
AB UnionS5 Sensor(2-pipe CW/HW Units Only)
For2-pipesystemsuse3-wayEndofCycleValve(EOC)sosupplywaterisrunningthroughthecircuit.TheS5sensorshouldbemountedonthesupplywaterpipe.
Page 22 of 58 IM 817-2
Typical Water Coil Piping - EOC Valve PipingFigure 70 - Face and Bypass With 3-way End-of-Cycle Valve (Piping Within Unit End Compartment)
Figure 71 - Face and Bypass With 3-way End-of-Cycle Valve (Piping Outside Unit End Compartment)
2
3
4
567
8
15
1
S5 Sensor
S5 Sensor
Table 20 - Descriptions
Three-way End of Cycle control valve (AAF®-HermanNelson®)
Coil air vent (AAF-HermanNelson)
Coil drain (AAF-HermanNelson)
Shutoff valve (Others)
Balancing shutoff valve(s) (Others)
Supply
Return
Unions (Others)—Must disconnect below floor line
Two-way, End of Cycle two-position valve (AAF-HermanNelson)
Union: Half attached to coil, half attached to valve
Modulating control valve (AAF-HermanNelson)
All piping, fittings and unions by others (not AAF-HermanNelson) except as noted
Steam check valve and pressure equalizing line (AAF-HermanNelson)
Float and thermostatic steam trap (Others)
Supply and return coil connection and stub-up unions by others
2
1
3
6
4
5
7
8
15
14
13
12
11
10
9
Typical Piping Arrangements Steam – Typical Modulating Valve PipingTheoptionalfactorysuppliedAAF®-HermanNelson®MicroTechII™2-wayModulatingsteamvalveisfurnishednormallyopentothecoil.When the valve is de-energized (off) there is full flow through the coil. Energizing the valve reduces the steam flow in a modulating fashion.
Refer to the arrow on the modulating valve body to determine the direction of flow. If the valve is mounted improperly, the unit will not operate properly and damage to the valve may result.
Thevalveshouldbeinstalledsothatthereisa2"(51mm)minimumclearancetoremovetheactuatorformthevalvebody.Provideunionsfor removal of unit coil and/or control valve as a future serviceconsideration.
Steamconnectionsmaybesameendascoolingcoilconnections,butarerecommendedtobeoppositeendtofacilitatepiping.WhenusingMicroTech II controls, theymust beopposite end.Themodulatingvalve accessory must be field installed on the unit for which it was selected.
Return
Shutoff Valve
Shutoff Valve
Supply
Return
Supply
Unit Coil
Equalizing Line
Steam Trap
Figure 73 - Same End Connections – Model AV 68/69 Coils
Control Valve: Install On Center Coil Connection
Vacuum Breaker (by AAF-HermanNelson)
Vacuum Breaker Tube (by AAF-HermanNelson)
Steam Trap (by Others)
1⁄4" Flare by 1⁄2" MPT Half-Union and 1⁄4" Flare (by AAF-HermanNelson)
Tee (by Others)
Union
Figure 72 - Typical 2-Way Steam Modulating Valve Piping
21
3
45
15
6
1515
7
CAUTION
IM 817-2 Page 23 of 58
Typical Steam Coil PipingFigure 76 - Face and Bypass With 2-way End-of-Cycle Valve - Same End Drain Connection (Piping Within Unit End Compartment)
Figure 77 - Face and Bypass With 2-way End-of-Cycle Valve - Same End Drain Connection (Piping Outside Unit End Compartment)
13
14
4
67
15
9 15
15
Figure 74 - 2-Way Steam Modulating Valve Control - Same End Drain Connection (Piping Within Unit End Compartment)
14
4
8
6
7
13
15
11
In Steam Systems:The optional factory-supplied AAF®-HermanNelson® MicroTech
II™ Modulating Control Valveforsteamapplicationsisthe2-waytype. It is shippedseparately from theunitventilator tohelpavoidshipping damage, yet provide the installer with maximum flexibility in making the field piping connection. Before proceeding, see Figures 72 through 77, as well as the job-specific piping drawings.
For steam applications, the 2-way, angle pattern valve furnished isnormallypipedopentothecoil.Allsteamcoilsare1-1/8"(34mm)female sweat connections. Coil connections terminate 9" (229mm)fromtheendoftheunit.Steamcoilshaveafactory-installedpressureequalizingvalveanda24"(610mm)longpressureequalizinglinethatterminatesina1/2"M.P.T. fitting.Steamconnectionsmaybesameendascoolingcoilconnections,butarerecommendedtobeoppositeendtofacilitatepiping.WhenusingMicroTechIIcontrols,theymustbeoppositeend.
SeeFigures73through77.Connectthe1/4"(6.35mm)vacuumbreakertubetothedownstreamreturnline.Makethisconnectiondownstreamofthetrapoutlet.
Figure 75 - Opposite End Drain Connection – (78/79 Coils)
Left End View Right End View
Left Hand Steam Supply and Right Hand Steam Return (Shown)
1⁄4" Flare By 1⁄2" MPT Half-Union and 1⁄4" Flare (by AAF-HermanNelson)
Steam Trap (by Others)
Vacuum Breaker Tube (by AAF-HermanNelson)
Control Valve: Install On Center Coil Connection
Steam Supply
Steam Return
Drain Line (by AAF-HermanNelson)
Vacuum Breaker Tube (by AAF-HermanNelson)
Tee (by Others)
Vacuum Breaker (by AAF-HermanNelson)
See page 22 for number designation descriptions.
See page 22 for number designation descriptions.
See page 22 for number designation descriptions.
14
13
4
6
7
8
15
9
Page 24 of 58 IM 817-2
Heating – Modulating Valve PipingHot Water (or 2-pipe CW/HW) Modulating Valve Piping
Return
Return
Balancing and Shutoff Valve
Shutoff Valve
Supply
Supply
2-way Modulating
Valve Unit Coil
Unions
2-way Modulating, Normally Open, Hot Water or 2-pipe CW/HW Valve Piping (typical)The2-wayModulatinghotwater(or2-pipeCW/HW)valveisfurnishednormallyopentothecoil.Whenthevalveisde-energized(off)thereis full flow through the coil. Energizing the valve reduces the volume of water flow in a modulating fashion.
3-way Modulating, Normally Open, HotWater or 2-pipe CW/HW Valve Piping (typical)The3-wayModulatinghotwater(or2-pipeCW/HW)valveisfurnishednormallyopentothecoil.Whenthevalveisde-energized(off)thereis full flow through the coil. Energizing the valve allows a varying amountofwatertobypassthecoil.
Return
Return
Balancing and Shutoff Valve
Shutoff Valve
Supply
Supply
3-way Modulating
Valve
Unit Coil
Union
Union
Balancing Valve
N.O.Common
N.C.
Whenpipingthemodulatingvalve,refertothearrowsonthemodulatingvalve body to determine the direction of flow. The valve should be installed so that there is a 2” (51mm) minimum clearance to remove the actuatorformthevalvebody.Provideunionsforremovalofunitcoiland/orcontrolvalveasafutureserviceconsideration.Hotwaterconnectionsmaybesameendascoolingcoilconnections,butarerecommendedtobeoppositeendtofacilitatepiping.WhenusingAAFMicroTechIIcontrols,theymustbeoppositeend.Themodulatingvalveaccessorymust be field installed on the unit for which it was selected.
S5 Sensor (2-pipe CW/HW Units Only)
S5 Sensor (2-pipe CW/HW Units Only)
Figure 80 - 3-way Modulating Valve Control (Piping Outside Unit End Compartment)
2
3
4
5
6
7
1515
15
11
S5 Sensor
Refer to the arrows on the modulating valve body to determine the direction of flow. If the valve is mounted improperly, the unit will not operate properly and damage to the valve may result.
See page 22 for number designation descriptions.
Figure 78 - 2-way Modulating Valve Control, Normally Open, Hot Water or 2-pipe CW/HW Piping
Figure 79 - 3-way Modulating Valve Control
CAUTION
IM 817-2 Page 25 of 58
Cooling – Chilled Water Modulating Valve Piping2-way Modulating, Normally Closed, Chilled Water Valve Piping (typical)The 2-way Modulating chilled water valve is furnished normallyclosed to the coil. When the valve is de-energized (off) there is no flow through the coil. Energizing the valve allows flow through the coil in amodulatingfashion.
3-Way Modulating, Normally Closed, Chilled Water Valve Piping (typical)
The3-wayModulatingchilledwatervalveisfurnishednormallyclosedto the coil. When the valve is de-energized (off) the flow bypasses the coil. Energizing the valve allows flow through the coil in a modulating fashion.
Return
Return
Balancing and Shutoff Valve
Shutoff Valve
Supply
Supply
2-way Modu-latingValve Unit Coil
Unions
Return
Shutoff Valve
Supply
Supply
3-way Modulating
Valve
Union
Balancing Valve
N.C.
N.O.
Return
Unit Coil
Union
Common
Balancing and Shutoff Valve
Figure 84 - 3-way Modulating Valve Control (Piping Within Unit End Compartment)
112
3
45
67
8
15
S5 Sensor
Refer to the arrows on the modulating valve body to determine the direction of flow. If the valve is mounted improperly, the unit will not operate properly and damage to the valve may result.
Figure 82 - 2-way Modulating, Normally Closed Chilled Water Valve Piping (Piping Outside Unit End Compartment)
See page 22 for number designation descriptions.
Figure 81 - 2-way Modulating Valve Control, Normally Closed, Chilled Water Piping
Figure 83 - 3-way Modulating Valve Control, Normally Closed, Chilled Water Piping
15
315
154
5
6
7
2
11
S5 Sensor
See page 22 for number designation descriptions.
CAUTION
Page 26 of 58 IM 817-2
Ensure refrigerant pressure taps are installed in piping end compartment for proper charging and setting of the TXV valve.
1-3/8" Left Endof unit(Less end panel)
Thermal Expansion Valve (TXV) Superheat Adjustment.
Return (Suction Line)
Bulb attached in the 2 or 10 o'clock position
Equalization Tube
Condensate Drain (Protect Drain Pan with a quenching cloth when brazing, to prevent damage).
Supply (Liquid Line)
Direct-Expansion (DX) R-22 PipingDX coils have O.D. sweat connections. Interconnecting tubing isfield-supplied. See Table 21, page 28 and job-specific drawings for correcttubingsizes.
Wrap TXV valve with a quenching cloth and remove bulb from suction line to avoid valve damage while brazing.
Condensate piping:AAF®-HermanNelson® cooling unit ventilators are designed forcondensateremovalintoacondensatedisposalsystem.Donotconnectthe unit drain connection so that condensate exits to the outsideand/orisexposedtofreezingtemperatures.Installer is responsible for any damage that might be caused from freezing condensate.Inapplicationswithanendcompartmentauxiliarydrainpan,seetheinstallationinstructionsshippedwiththeauxiliarydrainpanitself.
STOP! Before Brazing
Remove Bulb When BrazingTo Prevent Overheating Damage
Use A Quenching Cloth When Brazing, to Prevent Overheating The TXV Valve Body (Avoid Valve Damage and Erratic Operation)
Figure 86 - TXV Valve Piping Detail (Left Hand Shown)
Properventilationisrequiredforbrazing.Whenbrazing,besuretoprotectunitventilatorcomponentsfromoverheatingdamage(meltinginsulation,alsodamagetovalves,wiring,electronics,sensors,etc.).During brazing, bleed nitrogen through the piping. Using field-supplied material suitable for insulating refrigerant lines, wrap the thermalexpansionvalve (TXV)bulb and thepipingbetween theTXVandthepointwhere it enters thecoilwithat leastone thicknessof thematerial. Likewise, insulate the suction line. (See figures 87-90 for typicalpipingandwiring)Ensureproperinsulationofsupplyandreturnpiping.Properinsulationpreventslossofunitventilatorcapacity,overheatingofendcompartment,and/ormoisturedripping.
Piping Stub-up Within Cabinet
Unit End Compartment
Piping Stub-up Within 6" End Panel End Panel 6"Application and Dimension
Wall Line 1"
115⁄8"
10"Note: Space available in left end compartment for piping stub-up. Stub-up, including unions and shutoff valves, must disconnect below floor line for unit installation and removal.
Space available at left end of unit for piping stub-up when 6" end panel is used.
Left End of unit(Less end panel)
Wall Line
4"
1"
Unit End Compartment
6"
Figure 85 - Piping Stub-Up Details, 6" End Panel
Install Pressure Taps on Supply (Liquid Line) and Return (Suction Line) Piping (By Others).
6" End Panel
CAUTION
NOTICE
IM 817-2 Page 27 of 58
Figure 87 - Typical Piping and Wiring for Split System
2 Wires (+) Ground
To Open Sight Drain
TXV(Thermal Expansion Valve)
Filter Drier (Field Supplied)
Moisture Indicator Sight Glass (Field Supplied)
Weatherproof Fused Disconnect Per NEC
2 Wires (+) Ground
Insulated Suction Line
Fused Disconnect
Unit Ventilator Split Systems GuidelinesThefollowingprovidesbasicguidelinesthatwillprovidepropersystemcoolingandoperationofanR-22commercialDX/hotwatersystemforschoolapplications.DXsystemcomponentsmustbematchedandsizedcorrectly(notoversized)fortheload.
TheDXsystemmustincorporatethefollowing,providedbyothers,forproperoperation:• Size piping per ASHRAE Refrigeration Handbook (correct
refrigerant and compressor oil flow), see figure 88 and table 21.• Use clean sealed refrigerant grade piping (prevent system
contamination)• Install Liquid Line Filter Dryer (clean/dry system to prevent
damage of operating components), see figure 89.• InstallLiquidLineSightGlass(indicatesrefrigerantdrynessand
ifliquidinliquidline-do not use the sight glass to determine when refrigerant system is charged correctly), see figure 88.
• Installpressuretapsontheunitventilator'sliquidlineandsuctionlines for subcooling and superheat measurements at the unitventilator, see figures 88 and 89.
• InstallHighPressureSwitchatcondensingunitwiredincondensercontrolsystem(protectscompressorandrefrigerantsystemfromexcessivepressures-condenserfanfailureorovercharging),seefigure 90.
• Install Low Pressure Switch at condensing unit wired in thecondenser control system (low refrigerant pressure switchprotectsthesystemunderlowrefrigerantsuctionconditions),seefigure 90.
• InstallLowAmbientTemperatureSwitchatcondensingunitwiredin thecondensercontrolsystem(locksoutmechanicalcoolingbelow60oF-propersystemoperationandfreeeconomizerusage),see figure 90.
• IncorporateCompressorTimeDelay (5minute) incondensingunitcontrolsystem(reducesexcessivecompressorcycling),seefigure 90.
• Singlephasecompressors-considerhardstartkitstoovercomenon-equalizedpressureinrefrigerantlines.
• Incorporate Low Refrigerant Temperature Sensor (T4) incondensingunitcontrolsystem(T4protectsthesystemunderlowrefrigerant suction conditions) see figure 90.
• UVfansmustcontinuetorunuponLowRefrigerantTemperaturetripofT4(controlsbyothers)orS4(MicroTechII)(evaporatorair flow dissipates residual low coil surface temperatures - suction pressures raised, coil frosting reduced), see figure 90.
• UVfansmustcontinuetorunforsettimeperiodduringunoccupiedmodeaftersatisfactionofthespacesensor(dissipatesresiduallowevaporatorcoilsurfacetemperatures-reducingcoilfrosting),seefigure 90.
• LocktheFaceandBypassDamper(actuatorspringreturntofullfacewhende-energized)inthefullfacepositionduringmechanicalcooling(fullairthroughevaporatorcoilreduceslowrefrigerantsuctionconditions,potentialcoilfrosting)
• WhenBrazingbleedNitrogenthroughpiping(reducedoxidesandblockageinpiping/TXV)
• Use Heat Sink when brazing to prevent overheating theTXVvalvebodyandbulb(avoidvalvedamageanderraticoperation),see figure 86.
• Verify theTXV bulb securely attached at 2 or 10 o’clock for7/8"andsmallerdiametersuctionlinepiping(propersuctiongassensing and reduced hunting) See figure 86.
• InsulatetheTXVbulb(reactstorefrigeranttemperaturesandnotambient), see figure 88.
• Insulate the suction line piping (minimum heat pickup), see figure 88.• Evacuate and properly charge the refrigerant system, see figure 89.• Chargetosubcoolingatthecondensingunitperthecondensing
unit manufacturer’s instructions, typically 15oF to 16oF at theunit ventilator, subcooling at 95oF outdoor ambient (results incorrectrefrigerantdistributionatthecoiltopreventlowsuctiontemperatures)
• AdjustTXVforcorrectsuperheattoeliminate/minimizehunting,see figure 91.
• Set superheat to 5oF to 7oF at the UV coil suction line when95oF outdoor ambient (proper system superheat for optimumperformance).Allowsystemtosettlefor20to30minutestoreachstablesteadystateconditionsandthenrecheck/adjustsuperheatifnecessary,seetable23.
• Compensateboth subcooling and superheat for actual outdoorambientandindoorairtemperatures
• In windy areas, add wind baffles to condensing unit or build a parapet(eliminatewindeffectoncondensingunitcoilforproperTXV refrigerant flow at lower ambient)
• Forlowerambientconditionsinstallvariablespeedcondenserfanheadpressurecontroltomaintainheadpressuresbetween180psigand 280psig (for proper TXV refrigerant flow at lower ambient), see figure 90.
Page 28 of 58 IM 817-2
Typical conditions - 95oF ambient, 75 psig suction, 285 psig head pressure, 6-7oF superheat, 15oF subcooling.
LiquidLineDrier
Hazardous Voltage!Disconnect all electric power including remote disconnects before servicing. Failure to disconnect power before servicing can cause severe personal injury or death.
Sight Glass
TXV (Thermal Expansion Valve)
Insulate Bulb, (Re-acts To Refrigerant Temperature and Not Ambient)Insulate The Suc-tion Line Piping, (Minimum Heat Pickup)
Return (Suction Line)
Supply (Liquid Line)
Figure 88 - Insulate Bulb and Suction Line Piping Figure 89 - Typical Split System Evacuation/Charging Setup
Suction Line Service ValveLiquid Line Service Valve
Outdoor Fan
Compressor
Gauge Bar Hoses
Vacuum Pump
TXVIndoor Fans
Charging Cylinder
Indoor Coil
Outdoor Coil
Low PressureGauge
Outdoor Condensing Unit
Unit Ventilator
High PressureGauge
Figure 90 - Typical Unit Ventilator/Condensing Unit Wiring Diagram
Compressor
CompressorContactor
Capacitor
HeadPressureController(Optional)
FanMotor
HighPressureSwitch
LowPressureSwitch
TDR = Time Delay Relay TB = Terminal Block
T4
23
1
Rec3
Line Voltage
Factory WiredField Wired (By Others)
TDR or TB
Low AmbientTemp. Switch
To controls by others, to energize condensing unit normallyopen contact.
T1 T2
L2L1
L2
L1
24V
24V
Checking System ChargeThesystemchargeshouldbecheckedunderdesignconditions[95oFoutsideair,80oF/67oF(DB/WB)indoorair].Refertocondensingunitmanufacturer'sguidelines.Beforeadjustingrefrigerantcharge,verifythattheunitventilatorisoperatingatnormaldesigncfm.Nominalcfmisdeterminedwithadrycoil,andcfmwillbereducedduringairconditioningoperationwithawetcoil.Filtersandcoilmustbecleanandfanspeedsetathigh.temperaturetoobtainsubcooling.
Determining SubcoolingTodeterminecorrectsubcooling:
1. Measureoutdoorambient.Itmustbebetween65oFand105oF.2. Measureliquidlinetemperature6inchesfromtheTXVinlet.3. MeasureliquidlinepressureneartheTXV.4. Determine saturated liquid temperature from saturated
temperature pressurechart(table22).5. Subtractmeasured liquid line temperaturefromsaturated liquid
temperaturetoobtainsubcooling.6. Adjustchargepercondensingunitmanufacturerrecommendation
toobtain15-16oFsubcooling.
(By Others)(By Others)
Note: Table 21 piping dimensions are for systems with up to 30 ft. (9.14 m) vertical separation and up to 100 ft (30.47 m) horizontal separation from the outdoor condensing unit.
Table 21 - Dimensions, DX Tubing inches (mm)
Models AVS, AVV, AVB, AVR Suction Line O.D. Liquid Line O.D. S07 3/4" (19mm) 1/4" (6mm)
S10 3/4" (19mm) 1/4" (6mm)
S13 7/8" (22mm) 3/8" (10mm)
S15 7/8" (22mm) 3/8" (10mm)
S20 7/8" (22mm) 3/8" (10mm)
Typical Condensing Unit
Typical Unit Ventilator Interface
PressureTaps(by others)
Pressure Taps (Field Installed)
Pressure Taps (Field Installed)
NOTICE
WARNING
IM 817-2 Page 29 of 58
Do not force adjustment stem of TXV. When adjusting superheat setting, there are a maximum of 10 turns on the stem. Turning adjustment stem after reaching stop will damage valve.
Table 22 —Saturated Temperature - Pressure Chart (oF) R22-PSIG (oF) R22-PSIG (oF) R22-PSIG 32 57.5 44 74.5 80 143.6 33 58.8 45 76.0 85 155.7 34 60.1 46 77.6 90 168.4 35 61.5 47 79.2 95 181.8 36 62.8 48 80.8 100 195.8 37 64.2 49 82.4 105 210.8 38 65.6 50 84.0 110 226.4 39 67.1 55 92.6 115 242.7 40 68.5 60 101.6 120 259.9 41 70.0 65 111.2 125 277.9 42 71.4 70 121.4 130 296.8
43 73.0 75 132.2 140 337.3
Determining System SuperheatAfterthesubcoolinghasbeendetermined,checksystemsuperheat.
1. Determinerequiredsuperheatfromsuperheatrange,table23.2. Measuresuctionlinetemperature6inchesfromservicevalve.3. Measure suction line pressure at service valve and determine
saturatedsuctiontemperaturefromtable22.4. Subtractsaturatedsuctiontemperaturefrommeasuredtemperature
toobtainsuperheat.5. Refertotable23andadjustchargeasrequiredforcorrectsuperheat
atambientconditions.
Each time that charge is added or removed from the system, allow the system to run approximately 20 - 30 minutes before pressure and temperature readings are taken and superheat calculations made.
If system hunting occurs or subcooling is reduced, it may be necessary to adjust TXV to obtain correct superheat.
Superheat Adjustment1. Remove the seal cap from thermal expansion valve (see figure
91).2. Turntheadjustmentscrewclockwisetoincreasesuperheatand
counterclockwise to decrease superheat (see figure 91). One complete360oturnchangesthesuperheatapproximately3-4oF,regardlessoftherefrigeranttype.Asmuchas30minutesmayberequiredforthesystemtostabilizeaftertheadjustmentismade.
3. Replaceandhand-tightensealcap.
Figure 91 - Superheat Adjustment of TXV
SuperheatAdjustment Screw
Counterclockwise To Decrease Superheat Clockwise To Increase
Superheat
Remove Seal Cap
Outdoor
Indoor Coil Air Inlet Temp. Ambient DB/WB (50% RH) 75/63 80/67 85/71 105 * * 8-10 100 * 3-5 9-11 95 * 5-7 11-13 90 * 9-11 13-15 85 5-7 10-12 15-17 80 8-10 12-14 18-20 75 10-12 15-17 21-23 70 13-15 19-21 24-26
65 15-17 21-23 26-28
Table 23 —Superheat Range
Typical conditions - 95oF ambient, 75 psig suction, 285 psig head pressure, 6 - 7o superheat, 15oF subcooling
NOTICE
NOTICE
CAUTION
NOTICE
Page 30 of 58 IM 817-2
5 TimeClock(TC)(optionalonstandaloneunitsonly)(seefig.94) –Factorymounted7day/24hour,digitaltimeclockwithuptotwenty(20)programstosequencetheunitventilatorthroughoccupied and unoccupied modes in accordance with a userprogrammedtimeschedule.
6 External Signal Connection Plugs: Three (3) multi-pinplugs are factory provided and pre-wired with short wirewhips that are capped (theymust remain capped if not used).Provided for field wiring of :
• RemoteWallMountedTemperatureSensor (optionalaccessory). • ExternalInputSignals(byothers):unoccupied,remote
shutdown,ventilationlockout,dewpoint/humidity(night timeoperation),orexhaustinterlocksignals
• External Output Options (by others): lights on/off, faultindicationsignal,exhaustfanon/offorauxiliaryheat signal.
7 Electric Connection Box:Containsthemotorspeedtransformer.Refer to the unit wiring diagram for specifics.
8 Unit Main Power “On-Off” Switch: (SW1) Disconnects themainpowertotheunitforservicingorwhentheunitistobeshutdownforanextendedperiodoftime.
9 Fuse(s) - Fanmotorandcontrolshavethehotline(s)protectedbyfactoryinstalledcartridgetypefuse(s).
10 Control Transformer - 75VA24-voltNECClass2transformerfor24voltpowersupply.(Locatedbehindthemotortransformer).
11 Outdoor Air/Return Air Damper Actuator - (A1)Directcoupled,floating point (tristate) actuator that spring returns the outdoor air dampertotheclosedpositionuponalossofpower.
12 Face and Bypass Damper Actuator-(A2) Direct coupled, floating point(tristate)actuatorthatisnon-springreturned(ModelAVSonly).
13 Hydronic Coil Low Air Temperature Limit (T6 freezestat) – Factoryinstalledonallunitswithhydronic(water)coils.TheT6freezestatcutsoutat38oF(+/-3oF)andautomaticallyresetsat45oF(+/-3oF).
14 Low Refrigerant Temperature Sensor (S4) -TheS4sensorisprovidedonallunitswithadirectexpansion(DX)coolingcoil.It is located on the right hand side of the coil “u-bend”.
1 MicroTech II Unit Ventilator Controller (UVC): (LocatedBeneaththeLocalUserInterfacePanel).Factorymountedandrun tested, microprocessor-based DDC control device capableofcompleteStandaloneunitcontrol,Master/Servantcontrolorincorporatedintoabuilding-widenetworkusinganoptionalplug-incommunicationmodule.TheUVCcontainsamicroprocessorthatispreprogrammedwiththeapplicationcoderequiredtooperatetheunit.TheUVCsupportsupto6analoginputs,12binaryinputs,and9binaryoutputs.TheUVCEXPI/Oboardsupportsupto4additionalanaloginputsand8additionalbinaryoutputs.Master/Servant units have the controller factory configured and installed for a local peer-to-peer network between these units (networkwiring between these units needs to be field installed). Optional networkcommunicationisprovidedviaplug-incommunicationmodulesthatconnectdirectlytotheUVC.
2 Communication Module (optional): Plug-in networkcommunication module that is attached to the UVC via a 12-pin header and 4 locking standoffs.Available communicationmodules:
• Building Automation and Control Network (BACnet®) Master Servant/Token Passing (MS/TP)-AllowstheUVCtointer-operatewithsystemsthatusetheBACnet(MS/TP)protocolwithaconformancelevelof3.MeetstherequirementsofANSI/ASHRAE135-1995standardforBACnetsystems.
• LonWorks® compliant Space Comfort Controller (SCC) – Supports the LonWorks SCC profile number 8500_10.
• Metasys N2® Open – Provides N2 Open networkcommunicationcapabilitytotheUVC.
3 LocalUserInterface(LUI):(seefig.93)TheLUIprovidesaunitmountedinterfacewhichindicatesthecurrentunitoperatingstateandcanbeusedtoadjusttheunitventilatoroperatingparameters(operatingmode,temperaturesetpoints,fanspeedandoccupancymode).TheLUIfeaturesa2-digitdisplay,7keys(1keyishidden),and 9 individual LED indicators. See “Local User Interface” for furtherdetails.
4 TenantOverrideSwitch(seefig.94)–Providesamomentarycontact closure that causes the unit to enter the “tenant override” operatingmodeforasettimeperiod(default=120minutes).
1
2
7
8
9
10
12
11
6
Figure 92 - MicroTech II Sensor and Component Locations (Front View)
14
1315
17 18
1916
20
Making Control ConnectionsMicroTech II™ Unit Mounted DDC Control Components – Models AVS, AVV, and AVR
Not all external signal options can be used simultaneously and may not be available on all software models. Refer to the “UVC Input and Output Tables” in IM 739 for available options.
NOTICE
IM 817-2 Page 31 of 58
Figure 94 - AV Top View
43
5
15 Room Temperature Sensor -(S1)Theunitmountedsensorislocated in the sampling chamber (front, center section) whereroom air is continuously drawn through for prompt responsetotemperaturechangesintheroom.ARemoteWallMountedTemperatureSensorisalsoavailableforremoteroomtemperaturesensing.(optionalaccessory).
16 Discharge Air Temperature Sensor - (S2) The sensor islocatedonthesecondfanfromtherighttosensedischargeairtemperatures.
17 Outdoor Air Temperature Sensor-(S3)Thesensorislocatedintheoutdoorairsectionoftheunitbeforetheoutdoorairdamper.With network applications, the unit mounted sensor can beoverriddenbyaremotesensorthroughthenetwork.
18 Outdoor Air Humidity Sensor (S8) (optional)-Unitmountedhumidity sensor for units using Expanded outdoor enthalpyeconomizer or Leading Edge indoor/outdoor, true enthalpycomparisoneconomizer.Thesensorislocatedintheoutdoorairsectionoftheunitbeforetheoutdoorairdamper.Withnetworkapplications, the unit mounted sensor can be overridden by aremotesensorthroughthenetwork.
19 Room Humidity Sensor (S6) (optional) -Unitmountedhumiditysensor for units capable of passive or active dehumidification orwithunitsusingLeadingEdgeindoor/outdoor,trueenthalpycomparisoneconomizer.Thesensor is located in thesamplingchamber(front,centerpanel)whereroomairiscontinuouslydrawnthroughforfastresponsetohumiditychangesintheroom.Withnetworkapplications,theunitmountedsensorcanbeoverriddenbyaremotesensorthroughthenetwork.
20 CO2 Sensor (S7) (optional) –Unitmounted,singlebeamabsorptioninfraredgassensorwithasensingrangeof0–2000ppmandvoltage output of 0 to 10VDC (100 ohm output impedance).ThePitotTubesensingdeviceislocatedintheunitventilator’sreturnairstream.TheoptionalCO2sensorisusedwiththeUVC’sDemandControlVentilationfeaturetovarytheamountofoutsideairbasedonactualroomoccupancy.Withnetworkapplications,theunitmountedsensorcanbeoverriddenbyaremotesensorthroughthenetwork.
21 Control Valve(s) (not shown) –Optionalaccessoryvalve(s)maybe either 2 position “End of Cycle” (AVS models) or modulating (AVVandAVRmodels),tocontrolthequantityofwaterthroughthe coil. Available in 2-way or 3-way configurations. Spring return actuatorsarerequiredforallhotwaterandsteamheatingvalves.AllheatingvalvesareNormallyOpen(NO)andallcoolingvalvesNormallyClosed(NC).(Seepiping/valvesection)
22 Water In Temperature Sensor (S5)(not shown) –Thewaterintemperaturesensorisfactorywiredon2-pipeCW/HWunitsonly. The sensor must be field installed and insulated (by others) onthesupplyconnectionofthehydroniccoil.Thesensormustbelocatedonthesupplyconnectionwherethereiscontinuouswaterflow. It is located on the same side as the coil connections. The sensormeasurestheenteringwatertemperaturetodetermineifthetemperatureisacceptableforeitherheatingorcoolingbasedontheunit’soperatingstate.(seepipingsection)
Figure 93 - MicroTech II Control Boards (with LonWorks Module Installed)
Plug-in Control Module Terminal Connections
Note: If Installing Communication Module, refer to the installation instructions specific to that Communication Module.
IM 731 - MicroTech II BACnet® Communications Module for BACnet Master-Servant/Token Passing Networks.
IM 729 - MicroTech II LonWorks Communications Module compliant with LonMark Space Comfort Controller (SCC) Functional Profile.
IM 730 - MicroTech II Metasys N2® Communications Module for N2 Open Networks
Page 32 of 58 IM 817-2
Figure 95 - Local User Interface (LUI)
MicroTech IITM
FAN ONLY
COOL
HEAT
AUTO
HIGH
MED
LOW
AUTO
FUNC
ON/STOPFANMODE
Economizer Control CapabilitiesBasic–Comparestheinsideandoutsideairtemperaturesusingitem16(RoomTemperatureSensor)anditem18(OutdoorAirTemperatureSensor) to determine if outdoor air can be used for “free”, economizer coolingoperation.
Expanded -Comparestheinsideandoutsideairtemperaturesusingitem16(RoomTemperatureSensor)anditem18(OutdoorAirTemperatureSensor)andcalculatestheenthalpyoftheoutsideairrelativehumidityusingitem19(OutdoorAirHumiditySensor)todetermineifoutdoorair can be used for “free”, economizer cooling operation.
Leading Edge–Trueenthalpycomparisoneconomizerthatcomparestheinsideandoutsideairtemperaturesusingitem16(RoomTemperatureSensor)anditem18(OutdoorAirTemperatureSensor)andcomparestheenthalpyoftheinsideandoutsideairrelativehumidityusingitem19 (Outdoor Air Humidity Sensor) and item 20 (Room HumiditySensor) to determine if outdoor air can be used for “free”, economizer coolingoperation.
Economizer for ReheatBasic–Usesitems16(RoomTemperaturesensor,item18(OutdoorAirTemperatureSensor)and item20(RoomHumiditySensor) foractive dehumidification (reheat) or to determine if outdoor air can be used for “free”, economizer cooling operation.
Leading Edge-Usesitems16(RoomTemperatureSensor),item18(OutdoorAirTemperatureSensor), item19(OutdoorAirHumiditySensor) and item 20 (Room Humidity Sensor) for active dehumidification (reheat) or to determine if outdoor air can be used for “free”, economizer coolingoperation.
Local User Interface (LUI)Thebuilt-inLUItouchpad(SeeFigure94,item3)hasa2-digitLEDdisplaythatindicatesthecurrentunitoperatingstate.SeeOMforunittype, for details of operation. The touch pad will “digitally display”:
• Theroomsetpointtemperature• CurrentRoomTemperature(Withcertainbuttonsheldinplace)• Anyfaultcodefordiagnosticsattheunit(Withcertainbuttons
heldinplace)
TheLUIhas abuilt inmenu structure (HiddenKeyandPasswordprotected)with7keys(1keyishidden)and9individualLEDindicatorstoadjusttheunitventilatoroperatingparametersshownbelow.
Operating Mode States (4)• Heat-Heatingandeconomizeroperationonly
• Cool–Coolingandeconomizeroperationonly
• Fan Only–Fanoperationonly
• Auto – Unit automatically switches between heating,cooling and economizer operation to satisfy the room loadconditions.Thecurrentunitstateisalsodisplayed.
Fan States (4)• High(constantspeed)
• Medium (constantspeed)
• Low (constantspeed)
• Auto(partload,variableair)–Variesthefanspeedautomaticallytomeettheroomloadconditionswhethertheunitisinheating,cooling or economizer mode. The current fan speed is alsodisplayed.Duringlowloadornormaloperation(about60%ofthetime)thefanswilloperateatlowspeed.Whentheloadincreasestoanintermediatedemandthefansautomaticallyshifttomediumspeed. Atneardesignordesign loadconditions, thefanswilloperateonhighspeed.A10-minutedelaybetweenspeedchangesisincorporatedtominimizetheawarenessofthesechanges.Theoutdoorairdamperwillindexbasedonthefanspeedtomaintaintherequiredminimumcfm(cubicfeetperminute)ofventilationair.
Occupancy Modes (4)• Occupied–Normal,daytimeoperationwheretheunitmaintains
theroomsetpoint.
• Unoccupied –Nightsetbackoperatingmodeinwhichtheunitresponds to a new room set point and cycles to maintain thecondition.Thefancomesonwhenheatingorcoolingisneededand runs until the load is satisfied. The outside air damper is closed duringthismode.Withdirectexpansion(DX)coolingunits,whena cooling load is satisfied by the refrigerant system, the compressor isde-energizedandtheUnitVentilatorindoorfancontinuestorunfor a fixed period of time to remove possible frost buildup on the evaporatorcoil.
• Stand By Mode –Theunitventilatormaintainsthestandbymodesetpointtemperaturewiththeoutsideairdamperclosed.Thefanruns continuously unless it is configured to cycle in response to theroomload.
• Bypass Mode – By depressing the Tenant Override Switch(Item4) theunit isplacedback into theOccupiedModeforapredeterminedtime(defaultof120minutes).Thistimecanbesetin1-minuteincrementsfrom1minuteto240minutesthroughtheUnitVentilatorServiceTooloranetwork.
IM 817-2 Page 33 of 58
Refer to unit wiring diagram located on inside of right front panel, for actual wiring. Improper wiring can cause equipment and property damage.
MicroTech II Wiring Diagram – Typical
Motor
X1Trans.TapsperUnitSize(CFM)
750 1000 1250 1500 2000
HI BRN BLK BLK YEL 1/4 HP MED BLU BRN BRN BLK LOW BLU/WHT BLU BLU BRN HI BLU 1/3 HP MED BLU/WHT LOW YEL HI RED RED RED RED RED 1/2 HP MED BRN BRN BRN BLK BLU LOW YEL YEL YEL YEL BLK
Figure 96 - DE Cooling W/Hot Water Heat Damper Control 115, 208/230. 265 Volt/1 Phase
CAUTION
DISCONNECT ALL ELECTRICAL POWER BEFORE SERVICING UNIT TO PREVENT INjURY OR DEATH DUE TO ELECTRICAL SHOCK.
USE COPPER CONDUCTORS ONLY.UNIT TERMINALS ARE NOT DESIGNED TO ACCEPT OTHER TYPES OF CONDUCTORS.FAILURE TO DO SO MAY DAMAGE THE EQUIPMENT.
DANGER CAUTION
Page 34 of 58 IM 817-2
See Table 24, and Figures 96, 97 & 98 and the job-specific electrical drawings before proceeding with field power and control wiring. See also the wiring diagram provided on the unit ventilator right frontaccesspanel.Unitventilatorsequippedwithanoptionalelectricheatingcoilhaveelectricheatingcoilpowerconnectionsatrightendonly.
Procedure1. Providepowersupply to rightendcompartment tomatchunit
nameplate.
2. Wireleadsprovidedfromunitventilatorelectricconnectionboxtoloadsideofunitpowerswitch(switchprovidedbyAAF).
Thejunctionboxhas1"(25mm)and2"(51mm)knockouts,located10-1/2"(267mm)fromrightendofunit.
3. Providegroundwirefromgroundingscrewinswitchjunctionboxtoswitchgroundterminal.
4. Wire field power supply to line side of unit power switch. Wire groundconductortoswitchgroundterminal.
5. Mountunitpowerswitchinswitchjunctionboxandinstallswitchcoverplate(provided).
6. Onunitswithelectricheat,the2poleunitpowerswitchisreplacedby a 3 pole switch, and is mounted as shown on figure 97. (A) shows switchlocationforvalvecontrolunitsand(B),(C)and(D)showlocationforFace&Bypasscontrolunits.(B)isfor208,230and265voltunits.(C)showslocationfor460voltunits.
7. Use IM 747 for MicroTech II wiring information/installationprocedures.
Table 24 - Floor AV Electrical Data/Motor Data and Unit Amp without electric heat
Unit CFM L/s Motor UnitCurrent#
Series (Nom.) HPWatts
115V 208V 230V 265V S07 750 354 1/4 164 1.8 1.0 0.9 0.8 S10 1000 472 1/4 244 3.1 1.7 1.5 1.3 S13 1250 590 1/4 306 3.5 1.9 1.8 1.5 S15 1500 708 1/4 334 3.7 2.0 1.8 1.6
# Amps at unit voltage, 60 Hz, single phase
Use copper conductors only. Use of aluminum conductors may result in equipment failure and overheating hazards. All wiring in right hand compartment must be class 1.
MicroTech II™ Unit Electrical Connections
To avoid electrical shock, personal injury or death, be sure that field wiring complies with local and national fire, safety, and electrical codes, and voltage to the system is within the limits shown in the job-specific drawings and unit electrical data plate(s).
Power supply to unit must be disconnected before making field connections. To avoid electrical shock, personal injury or death, be sure to rigorously adhere to field wiring procedures regarding proper lockout and tagout of components.
Figure 97 - Electric Heat Unit Power Switch Locations
A
B
C
D
Figure 98 - Electric Connection Box and Junction Box Located in Right End Compartment
Auto Transformer
Fuses
High-Med.-Low-Off Motor Speed Switch
Switch junction Box
Terminal Strip
Electric Power Wire Opening in Back of Box
See tables 30 & 31, pages 47 & 48 for electric heat wiring data
DANGER
WARNING
CAUTION
IM 817-2 Page 35 of 58
Rigorously adhere to field wiring procedures regarding proper lockout and tagout of components.
MicroTech II™ Remote Wall Mounted Sensor
To avoid electrical shock, personal injury or death:1. Installer must be qualified, experienced technician.2. Disconnect power supply before installation to prevent
electrical shock and damage to equipment.3. Make all connections in accordance with electrical wiring
diagrams, and in compliance with national and local codes. Use copper conductors only.
4. Do not exceed ratings of the device. This is a low voltage device: Never apply more than 12VAC/VDC to any lead or damage will result.
5. Avoid locations where excessive moisture, corrosive fumes, or vibrations are present.
Window Exposure
Window Exposure
Window
Exposure
Interior Wall
Interior Wall
Interior Wall
Interior Wall
Unit
Unit
= Correct Sensor LocationFigure 100 - Correct Wall Sensor Locations
Note: Avoid placing wall sensor near drafty areas such as doors or windows. Avoid external walls, or dead spots near exposed columns. Avoid direct sunlight on wall sensor.
Window Exposure
= Incorrect Sensor Location
Window Exposure
Interior Wall
Interior Wall
Window Exposure
Unit
Unit
Interior Wall
Interior Wall
Window Exposure
Cubicle Wall
Shelving
File Cabinet
Shelving
Figure 101 - Incorrect Unit and Wall Sensor Locations
Figure 99 - Basic Remote Wall Sensor
LED
Tenant Override Button
Sensor
All MicroTech II equipped unit ventilators are provided as standard with a unit mounted space temperature sensor. The unit mounted temperature sensor is provided with a quick disconnect plug (white) located outside of box with numbered wires 101 and 102. When using a remote wall mounted temperature sensor the unit mounted temperature sensor quick disconnect plug must be separated so that the unit mounted sensor is disconnected from the UVC.
When Using A Remote Wall Mounted Temperature SensorIfadecisionismadetouseaRemoteWallMountedTemperatureSensorinsteadof theunitmounted roomair sensor thenplacementof theRemoteWallMountedTemperatureSensoriscriticalforproperroomtemperature sensing (see figures 100 and 101). The UVC is capable of usingoneofthreeremotewallmountedtemperaturesensors.Figure104showsa4-wireconnection(plusshielddrainwire)(seetable25).Itisrecommendedthatadditionalwiresbepulledtocompensateforpotentialwirebreakageor futureoptions.TheBasicWallMountedTemperatureSensorrequiresonly3-wires(plusshielddrainwire)sincetheBasicWallMountedTemperatureSensorhasnosetpointadjustment(see figure 103).
Table 25. Max Sensor Wire Length and Gauge
WARNING
WARNING
NOTICE Maximum sensor wire length for less than 1oF error
Gauge Length
14 AWG 800 ft. (244 m) 16 AWG 500 ft. (152 m) 18 AWG 310 ft. (94 m) 20 AWG 200 ft. (61 m) 22 AWG 125 ft. (38 m)
Page 36 of 58 IM 817-2
Wire Wips for Field Wiring with Caps (see the wiring diagram provided on the unit ventilator right front access panel)
Field Wiring at back of Local User Interface (LUI) Panel
Figure 102 - Model AV - Field Wiring Whips with Caps Viewed from Right End Compartment
Two pin plug for unit mounted sensor
▲
Field Wiring Remote Mounted Temperature SensorThe low voltage field wiring connections have all been centrally located withintheunitventilatorandareeasilyaccessible.To simplify field connections, multi-pin plugs are factory provided and pre-wired with short wire whips (see figure 102). Each of the wires in thesewirewhipsiscappedandshouldremaincappedifnotused.Theunitmountedtemperaturesensorisprovidedwithaquickdisconnectplug(white)withwiresnumbered102and103,andmustbeseparatedsothattheunitmountedsensorisdisconnectedfromtheUVC.Thisdisables the unit mounted sensor (see figure 102). See Figures 103 and104forwiringtheremotemountedtemperaturesensortotheunitcontrolwiring.All low voltage field wiring connections must be run in shielded cable with the shield drain wires connected as shown in the field wiring diagrams.
Installing the Remote Mounted Temperature Sensor
This describes the installation of the following three wall mountedsensormodels:• P/N111048101–Basic• P/N111048103–Expanded±3oFsetting• P/N111048102–Deluxe54oFto85oFsettingUse the installation instructions included with the Remote wallsensor.
Parts Included - All Models• pre-assembledsensorthatincludes: -large(50.8x101.6mm[2x4in.])mountingbase(1) -terminalblock(1) -1.5mm(1/16in.)coverscrew(1) -endcaps(2)• alternatesmall(80x80mm[3.15x3.15in.])mounting base(1)withattachedterminalblock(1)• coversliderinsertwithprintedlogosforMcQuay®(1) andAAF®(1)• No. 6-32 x 1 in. flat-head screw (2)• No.8x1.25in.panheadtappingscrew(2)• hollowplasticwallanchor(2)
Parts Included - 111048102 and 111048103 Only• alternateserratedsetpointdial(attached)• smoothsetpointdial(separate)
Special Tools Needed• .5mm(1/16in.)Allenwrench• 7 mm (1/4 in.) flat-blade screwdriver• holesawwith35mm(1-3/8in.)blade(forsurfacemounting only)• drillwith8mm(5/16in.)drillbit(forsurfacemountingonly)
The unit comes with a unit mounted sensor and does not require a remote wall mounted sensor.
Figure 104 - Wall Mounted Temperature Sensor Wiring for Expanded and Deluxe Wall Sensor
BLK
Static sensitive components. A static discharge while handling electronic circuit boards can cause damage to the components.Discharge any static electrical charge by touching the bare metal inside the main control panel before performing any service work. Never unplug any cables, circuit board terminal blocks, relay modules, or power plugs while power is applied to the panel.
Figure 103 - Wall Mounted Temperature Sensor Wiring for Basic Wall Sensor
896
P 1C o n n e c t o r
BLKWHTR E D
WireC a p s
Unit Ventilator
LED
C o m mAI-1
AI-2GND
6432
51
S e t p t . A d j .C o m mS e n s o rLED
Wal l Sensor(opt ion)
S h i e l d
F ie ld Wir ing (by Others)E x t e r n a l D e v i c e ( b y O t h e r s )
Factory Wir ing
GRN
CAUTION
NOTICE
IM 817-2 Page 37 of 58
6. Rotatethemountingbaseuntiloneofthearrowsonthe basepointsup.Ifnecessary,repositionthecoverscrew abovethearrow.Placethebaseagainstthewall,andmarkthescrew
holesusingthebaseasatemplate.7. Drilltwo8mm(5/16in.)holesatthemarkings.8. Insertthehollowplasticwallanchors(Figure106),position thebase,andthendrivethetwopan-headtappingscrews.9. Pullthewiringthroughthemountingbase.10.Removeterminalblockandwiretotheappropriateterminalsas
shownin“Wiring”.
11. Install terminal block onto sensor with terminal 6 next to the edge of sensor.
12. Replacethesensorandtightenthecoverscrew.13. Replacethetwoendcapsonthemountingbase.
Figure 107 - Insert Wall Anchors
Performing Surface Mounting Using Small BaseToperformsurfacemountingusingthesmallbase(Figure108):
Figure 106 - Surface Mounting Using Large Base
1. Slidethedesiredcoversliderinsertontothesensoruntilitsnapsintoplace.
2. Removethetwoendcapsfromthemountingbase.3. Removethecoverscrewusinga1.5mm(1/16in.)Allen wrenchanddiscardit.Removethesensor.4. Removeanddiscardtheterminalblockfrominsidethesensor.5. Drilla35mm(1-3/8in.)holeinthesurfacewherethesensorwill
bemounted.
MountingThe MicroTech II™ Wall Mount Sensor allows for two mountingmethods:wallboxmountingandsurfacemounting.
Note: Wallboxmountingrequiresthelargemountingbase.Useeitherthelargeorsmallmountingbaseforsurfacemounting.
Performing Wallbox MountingToperformwallboxmounting(Figure105):1. Slidethedesiredcoversliderinsertontothecoveruntilit snapsintoplace.2. Removethetwoendcapsfromthemountingbase.3. Loosenthecoverscrewusinga1.5mm(1/16in.)Allen wrenchandremovethesensor.4. Pullthecableorwiringthroughthewallboxandmountingbase.5. Rotatethemountingbaseuntiloneofthearrowsonthe basepointsupandthescrewopeningsinthebasealign withthethreadedholesinthewallbox.Ifnecessary,repositionthe
coverscrewabovethearrow.6. FastenthebasetothewallboxwiththeNo.6-32x1in. screwsprovided.7. Removeterminalblockandwiretotheappropriateterminalsas
shownin”Wiring”.
9. Replacethesensorandtightenthecoverscrew.10.Replacethetwoendcapsonthemountingbase.
Figure 105 - Wallbox Mounting
Performing Surface Mounting Using Large BaseToperformsurfacemountingusingthelargebase.(Figure106):1. Slidethedesiredcoversliderinsertontothesensoruntilitsnaps
intoplace.2. Removethetwoendcapsfromthemountingbase.3. Loosenthecoverscrewusinga1.5mm(1/16in.)Allen wrenchandremovethesensor.4. Drilla35mm(1-3/8in.)holeinthesurfacewherethesensorwill
bemounted.5. Pullthecableorwiringthroughthehole.
8. Install terminal block onto sensor with terminal 6 next to the edge of sensor.
IMPORTANTIMPORTANT
Page 38 of 58 IM 817-2
Setup and AdjustmentsSwitching Setpoint DialsToswitchsetpointdials:1. Removethesensorfromthemountingbase.2. Rotatethesmoothsetpointdialsothatitpointsstraightup.3. AsshowninFigure111,inserttheAllenwrenchthroughthehole
inthebackoftheprintedwiringboard(A)andpushgentlyuntilthesmoothsetpointdialisfree.
4. Presstheserratedsetpointdialintoplaceonthesensor, makingsurethatthedialpointsstraightup.5. Replacethesensoronthemountingbase.
Repairs and ReplacementNorepairoptionsavailable.CallyourlocalAAF-HermanNelsonrepresentativeforsensorreplacement.
Wiring
Figure 109 - 111048101 Sensor Wiring
Figure 108 - Surface Mounting Using Small Base
TerminalBlockon111048101Sensor
Shielded cable should always be used. However, shielded cable generally is not required, except in electrically noisy environments, such as near gas ignition systems, radar or magnetic resonance imaging equipment, etc. It is the responsibility of others to determine what constitutes an “electrically noisy” environment for each installation. Refer to table 25, page 35 for maximum wire length.
6. Pullthecableorwiringthroughthehole.7. Placethesmallbaseagainstthewall,(withthearrowon thebasepointingup)andmarkthescrewholesusingthe baseasatemplate.8. Drilltwo8mm(5/16in.)holesatthemarkings.9. Insertthehollowplasticwallanchors(Figure108),position thebase,andthendrivethetwopan-headtappingscrews.10.Pullthewiringthroughthemountingbase.11.Wiretotheappropriateterminalstothesmallmounting baseasshownin“Wiring”.12.Snapthesensorintothesmallmountingbase(coverscrewisnot
required).
Figure 110 - 111048102 and 111048103 Sensor Wiring
Figure 111 - Removing the Standard Setpoint Dial
A
Setpoint Dial
NOTICE
IM 817-2 Page 39 of 58
DigitalReadyisafactoryinstalledpre-wiredpackageofselectedDirectDigital Control (DDC) components. It facilitates the field hook up of a DDCUnitVentilatorController(UVC)thatiscompatiblewiththesefactoryinstalled,pre-wiredcomponents,andcapableofprovidingthestandardASHRAEIIcycle.
It is the responsibility of the Automatic Temperature Control supplier to ensure the controls operate correctly and protect the unit.
DigitalReadyconsistsofthefollowingcomponentswhicharefactorywiredandpowered:
1 Unit Main Power “On-Off” switch – disconnects main power to theunitforservice.Non-fusedpowerinterruptswitch
2 Fuse(s)–fanmotor,autotransformer andcontrol transformerhavethehotline(s)protectedbyfactoryinstalledcartridgetypefuse(s).
3 Three (3) speed HIGH-MEDIUM-LOW-OFF motor fan speedswitch(SW2).
4 75 VA 24-volt NEC Class 2 transformer for 24-volt powersupply
5 Three10-poleEuropatype16awgterminalstripsratedfor10ampsat300voltswithnickelplatedconnectorsandzincplatedclampingscrews(TB1,TB2,TB3).
6 Spaceavailableinleftendcompartment,approximately8"x21"(203mmx533mm)forUVCmounting(byothers)
Making Control ConnectionsDigital Ready™ – Face & Bypass Control Components Model AVS
1
2
3
4
57
8
9
10
12
11
6
Figure 112 - Component Locations (Vertical Floor Unit Shown)
13
15
Outdoor Air Opening (Sensor)
Motor
Wired to the Terminal Strips:
7 Interface with the fan motor start/stop relay, (R4) in electricconnectionbox.
8 InterfacewithafactoryinstalledLowAirTemperatureLimit(T6-Freezestat).Cutsoutbelow38oF±2oFandautomaticallyresetsabove45oF±2oF.Respondswhenany15%ofthecapillarylengthsensesthesetemperatures.WiredsothatuponT6cutout,theoutsideairdamper(A1)closes,thehotwatervalveopensandthe24voltpowersupplytotheterminalstrip(T6Sig)isinterrupted.
9 DischargeAirTemperatureSensors–(S2)10KohmNTC(NegativeTemperature Coefficient) and 1 K ohm PTC (Positive Temperature Coefficient). Located on the second fan housing from the right to sensedischargeairtemperatures.
10 RoomTemperatureSensors-(S1)10Kohm(NTC)and1Kohm(PTC).Theunitmountedsensorsarelocatedintheunitsamplingchamber (front center section), where room air is constantlydrawnthroughforpromptresponsetotemperaturechangesintheroom.
11 OutdoorAirTemperatureSensors-(S3)10Kohm(NTC)and1Kohm(PTC).Thesensorsarelocatedintheoutdoorairsectionoftheunitbeforetheoutdoorairdamper.
12 Directcoupled,proportionalcontrol(2to10VDCor4to20mA)OutdoorAir/ReturnAirDamperActuator(A1)(springreturn).
13 Directcoupled,proportionalcontrol(2to10VDCor4to20mA)FaceandBypassDamperActuator(A3)(non-springreturned).
14 InterfacefromtheterminalboardwithoneortwoEndofCycleDDC valves with spring return actuators (by others) (NotShown)providing24-voltpower.Open/shut signal fromUVC(byothers).
15 24-volt power wiring harness from the right to left-hand endcompartmentthroughthebuilt-inmetalwireracewayterminatingatthreeterminalblocks.
16 LowRefrigerantTemperatureSensor(T4-capillarysensor),helpsprotectagainstabnormallylowevaporatorcoiltemperatures.DirectExpansion(DX)unitsonly(Notshown).
CAUTION
Page 40 of 58 IM 817-2
Ref
er to
uni
t wiri
ng d
iagr
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cate
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the
right
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t pan
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iring
Diag
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113
- F
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Byp
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Con
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C
AU
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IM 817-2 Page 41 of 58
Figure 114 - Sensor Locations
Discharge Air Sensor
Room Air Sensor
Holes in Front Access Panel
Outdoor Air Sensors
Outdoor Air Opening
basedona2to10VDCinputfromtheDDCUnitVentilatorController(UVC). A 4 to 20 mA input signal can be used with the field addition of aBelimoZG-R01(orequivalent)500ohmresistor(byothers).Refertothewiringdiagramforproperinstallationoftheresistor.A2to10VDC output signal is provided for damper position feedback. Thegearscanbemanuallydisengagedwithabuttonontheactuatorcover.Rotationiscounterclockwisetobypassairaroundcoil.
Theoutdoorair/returnairdamperactuatorisaunitmounted,directcoupled,proportionalcontrolactuatorthatspring returnstheoutdoorairdampershutuponalossofpower.Theactuatorprovidesproportionaldampercontrolbasedona2 to10VDC input from theDDCUnitVentilatorController(UVC).A4to20mAinputsignalcanbeusedwith the field addition of a Belimo ZG-R01 (or equivalent) 500 ohm resistor(byothers).Refertothewiringdiagramforproperinstallationoftheresistor.A2to10VDCoutputsignalisprovidedfordamperpositionfeedback.RotationisclockwisetoopenOA,closeRA.
Face and Bypass Damper ActuatorTheFace&Bypassdamperactuatorisaunitmounted,directcoupled,non-springreturnedactuatorusedforthemodulationofthefaceandbypass damper. The actuator provides proportional damper control
A 10 K ohm Negative Temperature Coefficient (NTC) sensor and a 1 K ohm Positive Temperature Coefficient sensor is provided for the dischargeair,outdoorairandroomairtemperaturemeasurement.TheyarelocatednexttoeachotherintheairstreamasshowninFigure114.Each iswired to the terminalstripseparatelyso that theAutomaticTemperatureControlcontractormayselecttheappropriatesensorfortheapplication.
10 K ohm NTC SensorThe10KohmNTCsensorisconstructedfromstainlesssteelwithanepoxysealandtwistedwireleads.
Type: 10K ohm @ 25oCAccuracy: ±0.2oF, 40oF - 80oF ±0.36oF, 32oF - 158oF
1 K ohm PTC SensorThe1Kohmsensorisashrink-wrapencapsulated,PTCsiliconsensingelementwithstranded,tinnedcopperwireleads(#22AWG).
Type: 1035 ohm @ 25oCAccuracy:±0.9oF, 5oF - 167oF
Digital Ready Unit MountedTemperature Sensor Specifications
Actuator Type Power Power Transformer Torque Running Direction of Rotation
Supply Consumption Sizing Time
Outdoor Air/Return Air 24 VAC ±20% 4 VA 80 to 110 sec Reversible with built in switch L/R
Damper Actuator
50/60 HZ 2 Watts (class 2 power source) 45 in-lb for 0 to 35 in-lb L = CW with an increase in voltage. 24 VDC ±10% R = CCW with an increase in voltage. Spring: reversible with CW/CCW
Face & Bypass Damper Actuator 24 VAC ±20% Running: 2.5 Watt; 5 VA 90 sec constant mounting.
50/60 HZ Holding: 1 Watt (class 2 power source) 45 in-lb (independent Motor: reversible with built in switch. 24 VDC ±10% of load) CW = CW with a decrease in signal. CCW = CCW with a decrease in signal.
Table 27. - Actuators Technical Data
Table 26 - Temperature Sensors Resistance Values
Digital Ready – Damper Actuator SpecificationsOutdoor Air/Return Air Damper Actuator
Figure 115 - Outdoor Air/Return Air Damper Actuator & Face and Bypass Damper Actuator
Temperature (oC) -40 -20 0 20 25 30 40 50 60
10 K ohm (NTC)
Resistance (ohms) 337200 97130 32660 12490 10000 8056 5326 3602 2489
1 K ohm (PTC)
Temperature (oC) -40 -20 0 20 25 30 40 50 60
Resistance (ohms) 613 727 855 997 1035 1074 1153 1237 1323
Page 42 of 58 IM 817-2
Table 28 - Floor AV Electrical Data/Motor Data and Unit Amp without electric heat Unit CFM
L/s Motor UnitCurrent#
Series (Nom.) HP
Watts 115V 208V 230V 265V
S07 750 354 1/4 164 1.8 1.0 0.9 0.8 S10 1000 472 1/4 244 3.1 1.7 1.5 1.3 S13 1250 590 1/4 306 3.5 1.9 1.8 1.5
S15 1500 708 1/4 334 3.7 2.0 1.8 1.6
# Amps at unit voltage, 60 Hz, single phase
Digital Ready Unit Electrical Connections
See Table 28, and Figure 113 and the job-specific electrical drawings before proceeding with field power and control wiring. See also the wiring diagramprovidedontheunitventilatorrightfrontaccesspanel.Inaddition,thoseunitventilatorsequippedwithoptionalelectricheatingcoilhaveelectricheatingcoilpowerconnectionsatrightendonly.
Procedure1. Provide power supply to right end compartment to match unit
nameplate.
2. Wireleadsprovidedfromunitventilatorelectricconnectionboxtoloadsideofunitpowerswitch(switchprovidedbyAAF).
Thejunctionboxhas1"(25mm)and2"(51mm)knockouts,located10-1/2"(267mm)fromrightendofunit.
3. Providegroundwirefromgroundingscrewinswitchjunctionboxtoswitchgroundterminal.
Figure 117 - Unit Left End Compartment and Terminal Strip
Figure 116 - Terminal Strip
Use copper conductors only. Use of aluminum conductors may result in equipment failure and overheating hazards. All wiring in right hand compartment must be class 1.
4. Wire field power supply to line side of unit power switch. Wire groundconductortoswitchgroundterminal.
5. Mountunitpowerswitchinswitchjunctionboxandinstallswitchcoverplate(provided).
6. Figure121(A)showsswitchlocationforvalvecontrolunitsand(B),(C)and(D)showlocationforFace&Bypasscontrolunits.(B)isfor208,230and265voltunits.
7. See figure 116 & 120 for terminal strip designations.
Terminal Strip
Left End Compartment for Mounting Controls by Others
Rigorously adhere to field wiring procedures regarding proper lockout and tagout of components.
To avoid electrical shock, personal injury or death:1. Installer must be qualified, experienced technician.2. Disconnect power supply before installation to prevent
electrical shock and damage to equipment.3. Make all connections in accordance with electrical wiring
diagrams, and in compliance with national and local codes. Use copper conductors only.
4. Do not exceed ratings of the device. This is a low voltage device: Never apply more than 12VAC/VDC to any lead or damage will result.
5. Avoid locations where excessive moisture, corrosive fumes, or vibrations are present.
WARNING
WARNING
CAUTION
IM 817-2 Page 43 of 58
5 Fordirectexpansion(DE)coilstheunitissuppliedwithaLowRefrigerantTemperatureSensor (T4-capillarysensor), that islocatedontheleavingairsideofthedirectexpansioncoil.T4cutsoutbelow34oF±2oFandautomaticallyresetsabove38oF±2oF.Respondswhenany15%ofthecapillarylengthsensesthesetemperatures.
6 ForDirectExpansion(DE)coilstheunitissuppliedwitha40VA,24volt,NECclass2transformer,for24voltpower(X2),withafactoryinstalled5minutetimerdelayrelay(TDR)(locatedinsideUnitPowerBox).
It is the responsibility of the Automatic Temperature Control supplier to ensure that T4 and R4 are incorporated properly to protect the unit.
Making Control ConnectionsControls by Others ComponentsAAF®-HermanNelson® unit ventilators come with factory installedcomponents and wiring. It facilitates the field hookup of controls by others,capableofprovidingthestandardASHRAEIIcyclethatarecompatiblewiththesefactoryinstalledandpre-wiredcomponents.
It is the responsibility of the Automatic Temperature Control supplier to ensure the controls operates correctly and protect the unit.
Controlsbyothersoptionconsistsofthefollowingcomponentswhicharefactoryprovidedandwiredwhereindicated:
1 Unit Main Power “On-Off” switch – disconnects main power to theunit.Non-fusedpowerinterruptswitch(S1)
2 Fanmotor,autotransformerandcontroltransformerhavethehotline(s)protectedbyfactoryinstalledfuse(s).
3 Three (3) speedHIGH-MEDIUM-LOW-OFFmotor fan speedswitch (SW2), wired to auto transformer (X1), to provide fanspeed/airdelivery.
4 FactoryinstalledLowAirTemperature(limitT6-freezestat)acrossleavingairsideofhydronicheatingcoil.Cutsoutbelow38oF±2oFandautomaticallyresetsabove45oF±2oF.Respondswhenany15%ofthecapillarylengthsensesthesetemperatures.
It is the responsibility of the Automatic Temperature Control supplier to ensure the T6 freezestat is incorporated properly to protect the unit.
Figure 118 - Controls by Others Unit Component Locations
Figure 119 - Controls by Others Unit Power and Junction Box Connection Location
1
2
3
4
5
6
6
Motor
Auto Transformer
Fuses
High-Med.-Low-Off Motor Speed Switch
Switch junction Box
Terminal Strip
Electric Power Wire Opening in Back of Box
CAUTION
CAUTION
CAUTION
Page 44 of 58 IM 817-2
Cont
rols
by O
ther
s Wiri
ng D
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Typi
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Figu
re 1
20 -
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IM 817-2 Page 45 of 58
Table 29 - Floor AV Electrical Data/Motor Data and Unit Amp without electric heat
Unit CFM L/S Motor UnitCurrent#
Series (Nom.) HP
Watts 120V 208V 230V 265V
S07 750 354 1/4 216 2.2 1.2 1.1 1.0 S10 1000 472 1/4 277 2.8 1.6 1.4 1.3 S13 1250 590 1/4 335 3.3 1.9 1.7 1.5
S15 1500 708 1/4 445 4.4 2.6 2.3 2.0
# of Amps at unit voltage, 60 Hz, single phase
See Table 29, and Figures 120 - 122 and the job-specific electrical drawings before proceeding with field power and control wiring. See also the wiring diagram provided on the unit ventilator right frontaccesspanel.Unitventilatorsequippedwithanoptionalelectricheatingcoilhaveelectricheatingcoilpowerconnectionsatrightendonly,(seetables30&31,pages47-48).
Procedure1. Providepowersupply to rightendcompartment tomatchunit
nameplate.
2. Wireleadsprovidedfromunitventilatorelectricconnectionboxtoloadsideofunitpowerswitch(switchprovidedbyAAF).
Thejunctionboxhas1"(25mm)and2"(51mm)knockouts,located10-1/2"(267mm)fromrightendofunit.
3. Providegroundwirefromgroundingscrewinswitchjunctionboxtoswitchgroundterminal.
4. Wire field power supply to line side of unit power switch. Wire groundconductortoswitchgroundterminal.
5. Mountunitpowerswitchinswitchjunctionboxandinstallswitchcoverplate(provided).
6. Onunitswithelectricheat,the2poleunitpowerswitchisreplacedby a 3 pole switch and is mounted as shown on figure 121. (A) showsswitchlocationforvalvecontrolunitsand(B),(C)and(D)showlocationforFace&Bypasscontrolunits.(B)isfor208,230and265voltunits.(C)showslocationfor460voltunits.
Also,onelectricheatunitswithcontrolsbyothers,wiringtothefield mounted controller is done in the left end compartment. See specific wiring diagram for details.
Theunitcomeswithwiringthatrequiresrelaycontrolsbyothers.
It is the responsibility of the Automatic Temperature Control supplier to ensure that the proper electric heat control components are installed, and operate correctly to protect the unit.
Making Control ConnectionsControls by Others – Electrical Connections
See tables 30 & 31, pages 47 & 48 for electric heat wiring data
Figure 121 - Electric Heat Unit Power Switch Locations
A
B
C
D
Figure 122 - Controls by Others Unit Power and Junction Box Connection Location
Auto Transformer
Fuses
High-Med.-Low-Off Motor Speed Switch
Switch junction Box
Terminal Strip
Electric Power Wire Opening in Back of Box
Rigorously adhere to field wiring procedures regarding proper lockout and tagout of components.
To avoid electrical shock, personal injury or death:1. Installer must be qualified, experienced technician.2. Disconnect power supply before installation to prevent
electrical shock and damage to equipment.3. Make all connections in accordance with electrical wiring
diagrams, and in compliance with national and local codes. Use copper conductors only.
4. Do not exceed ratings of the device. This is a low voltage device: Never apply more than 12VAC/VDC to any lead or damage will result.
5. Avoid locations where excessive moisture, corrosive fumes, or vibrations are present.
Use copper conductors only. Use of aluminum conductors may result in equipment failure and overheating hazards. All wiring in right hand compartment must be class 1.
WARNING
WARNING
CAUTION
CAUTION
Page 46 of 58 IM 817-2
X1
Lead
Col
orp
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nitS
ize
(CFM
)
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otor
75
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1250
15
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Diag
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IM 817-2 Page 47 of 58
To avoid electrical shock, personal injury or death, be sure that field wiring complies with local and national fire, safety, and electrical codes, and voltage to the system is within the limits shown in the job-specific drawings and unit electrical data plate(s). Power supply to unit must be disconnected when making field connections. Rigorously adhere to field wiring procedures regarding proper lockout and tagout of components.
Electric Heating Table 30 - Standard Motor Electric Heat Capacities, Amps, Wire Sizing, and Over Current Protection
# Amps at unit voltage, 60Hz, single phaseNote: Unit wire sizing should be determined in accordance with NEC and local codes.* External static pressure ranges must be strictly adhered to.
WARNING
Unit T ype
AVS AVV AVR
AVV AVR
AVS AVV AVR
AVV AVR
AVS AVV AVR
AVV AVR
AVS AVV AVR
AVV AVR
C F MNumber of E lectric E lements 3 6 3 6 3 6 3 6K W 6 12 8 16 10 20 12 24MB H 20.48 40.96 27.3 54.61 34.13 68.26 40.96 81.91F inal Air T emp F (70 F entering air temp) 95.2 120.3 95.2 120.3 95.2 120.3 95.2 120.3Air T emperature R is e 25.2 50.3 25.2 50.3 25.2 50.3 25.2 50.3E lectric Heating Amperes 28.8 57.7 38.5 76.9 48.1 96.2 57.7 115.4
208-60-1 Unit Minimum C ircuit Ampacity 39.1 75.23 51.23 99.23 63.23 123.4 75.23 147.4Maximum F us e S ize or C ircuit B reaker Amps 40 80 55 100 70 130 80 150E lectric Heating Amperes 25.04 50.09 33.18 66.37 41.63 83.27 50.09 100.2
230-60-1 Unit Minimum C ircuit Ampacity 34.4 65.71 44.58 86.06 55.14 107.2 65.71 128.3Maximum F us e S ize or C ircuit B reaker Amps 35 70 45 90 60 110 70 130E lectric Heating Amperes 21.74 43.59 28.85 57.7 36.17 72.33 43.59 87.07
265-60-1 Unit Minimum C ircuit Ampacity 30.28 57.59 39.16 75.22 48.31 93.52 57.59 111.9Maximum F us e S ize or C ircuit B reaker Amps 35 60 40 80 50 100 60 120E lectric Heating Amperes 16.7 33.3 22.2 44.4 27.8 55.5 33.3 66.6
208-60-3 Unit Minimum C ircuit Ampacity 23.98 44.73 30.85 58.6 37.85 72.48 44.73 86.35Maximum F us e S ize or C ircuit B reaker Amps 25 45 35 60 40 80 45 90E lectric Heating Amperes 14.5 28.9 19.2 38.3 24.0 48.1 28.9 57.8
230-60-3 Unit Minimum C ircuit Ampacity 21.2 39.23 27.1 51.0 33.1 63.2 39.2 75.4Maximum F us e S ize or C ircuit B reaker Amps 25 40 30 55 35 70 40 80E lectric Heating Amperes 7.2 14.5 9.6 19.2 12.0 24.0 14.5 28.9
460-60-3 Unit Minimum C ircuit Ampacity 12.1 21.23 15.1 27.1 18.1 33.1 21.2 39.2Maximum F us e S ize or C ircuit B reaker Amps 15 25 20 30 20 35 25 40
Page 48 of 58 IM 817-2
Electric Heating Table 31 - High Static Applications Electric Heat Capacities, Amps, Wire Sizing, and Over Current Protection
Note: Electric heat disconnect provided.
Unit T ypeAVS AVV AVR
AVV AVR
AVS AVV AVR
AVV AVR
AVS AVV AVR
AVV AVR
AVS AVV AVR
AVV AVR
C F MNumber of E lectric E lements 3 6 3 6 3 6 3 6K W 6 12 8 16 10 20 12 24MB H 20.48 40.96 27.3 54.61 34.13 68.26 40.96 81.91F inal Air T emp F (70 F entering air temp) 95.2 120.3 95.2 120.3 95.2 120.3 95.2 120.3Air T emperature R is e 25.2 50.3 25.2 50.3 25.2 50.3 25.2 50.3E lectric Heating Amperes 28.8 57.7 38.5 76.9 48.1 96.2 57.7 115.4
208-60-1 Unit Minimum C ircuit Ampacity 42.2 78.33 54.33 102.3 66.33 126.5 78.33 150.5Maximum F us e S ize or C ircuit B reaker Amps 45 80 55 110 70 130 80 175E lectric Heating Amperes 25.04 50.09 33.18 66.37 41.63 83.27 50.09 100.2
230-60-1 Unit Minimum C ircuit Ampacity 37.5 68.81 47.68 89.16 58.24 110.3 68.81 131.4Maximum F us e S ize or C ircuit B reaker Amps 40 70 50 90 60 120 70 140E lectric Heating Amperes 21.74 43.59 28.85 57.7 36.17 72.33 43.59 87.07
265-60-1 Unit Minimum C ircuit Ampacity 33.38 60.69 42.26 78.32 51.41 96.62 60.69 115Maximum F us e S ize or C ircuit B reaker Amps 35 70 45 80 55 100 70 120E lectric Heating Amperes 16.7 33.3 22.2 44.4 27.8 55.5 33.3 66.6
208-60-3 Unit Minimum C ircuit Ampacity 27.08 47.83 33.95 61.7 40.95 75.58 47.83 89.45Maximum F us e S ize or C ircuit B reaker Amps 30 50 35 70 45 80 50 90E lectric Heating Amperes 14.5 28.9 19.2 38.3 24 48.1 28.9 57.81
230-60-3 Unit Minimum C ircuit Ampacity 24.33 42.33 30.2 54.07 36.2 66.33 42.33 78.46Maximum F us e S ize or C ircuit B reaker Amps 25 45 35 55 40 70 45 80E lectric Heating Amperes 7.2 14.5 9.6 19.2 12 24 14.5 28.9
460-60-3 Unit Minimum C ircuit Ampacity 15.2 24.33 18.2 30.2 21.2 36.2 24.33 42.33Maximum F us e S ize or C ircuit B reaker Amps 20 25 20 35 25 40 25 45
IM 817-2 Page 49 of 58
14"(356mm)
5"(127 mm)
5" (127 mm)
Remove debris, dust, dirt, and any obstruction from the area in front of the return air intake grille at the floor (approximately 3' - see shaded area) as this will affect unit performance. If a draftstop system has been installed be sure that all draftstop intake grilles are unobstructed.
Figure 124 - Cabinet(s) Meeting Unit Ventilator (refer to the instructions specific to the installation, included with the cabinets).
Draftstop™ System/Window Down-draft Installation Windowdown-draftprotectionisrecommendedforclassroomswherethefollowingconditionsexist:
1. Windowareaexceeds40%ofthetotaloutsidewallarea.2. Single-paneglassisused.3. Outsidetemperaturesarebelow35oF for a significant portion of
theoccupiedperiod.
The need for window down-draft protection will not always be soclearcut.Whereuncertaintyexists,afurthercheckcanbemadebycalculatingthewindowheatlossatanoutdoortemperatureof35oF.Ifestimatedwindowheatlossexceeds250BTUH/FT,windowdown-draftprotectionisrecommended.Ifestimatedwindowheatlossislessthan250BTUH/FT,theneedfordown-draftprotectionismarginalbutshouldnotbearbitrarilydismissed.
The “DraftStop” system can be employed even in those marginal applications to provide the occupants comfort without the materialinstallation and operating cost penalty associated with “auxiliaryradiation.” The unit ventilator is ordered with the return air intake having a draftstop blockoff to restrict return air flow through the front bottom unit opening, option “30” in field “11” of the model number. This allows drawingof returnair through thedraftstopenclosure locatedunderthewindows.Amanuallyadjustabledamperislocatedbeneatheachsection of DraftStop grille, see figure 128 on page 50. This damper is providedsothatauniformairvelocitycanbeachievedthroughouttheentirelengthoftheDraftStopgrille.Thissimpleadjustmentismadeonce by the installer during the final stage of installation.
Falling Cold Airfrom Window
Figure 125 - DraftStop System Concept
Table 30. DraftStop Grille Length
Figure 127 - Typical Finned Radiation Enclosure (left) And Typical DraftStop Enclosure (right)
Outdoor Air Intake Opening
Figure 126 - Unit Back Showing knockouts for DraftStop Applications
End compartment Draftstop knockouts must be removed for proper Draftstop operation. (21-7/8" units only)
Cabinets
20" High DraftStop Wall Enclosure
24" High DraftStop Wall Enclosure or Storage CabinetsUnit
Nom. CFM
Minimum Length (Ft.) Each Side
Maximum Length (Ft.) Each Side
Minimum Length (Ft.) Each Side
Maximum Length (Ft.) Each Side
750
1000
1250
1500
3
4
5
6
13
18
22
25
3
4
5
6
22
30
36
42
NOTICE
Page 50 of 58 IM 817-2
Draftstopismadeupofthreeseparatesectionsaslistedbelow:
1. Upperchannelorbackplate2. Mountingcomponents3. Enclosuresandtrims
Items1,and2arematerialswhichwillberequiredtostarttheinstallation.Item3isthecompletionmaterialandshouldbestoredinasafeareauntilneeded.Thefollowingstep-by-stepproceduresshouldbeadheredto:
1. Checktheareainwhichtheequipmentistobeinstalledandclearawaythedebris.
2. Review the engineered floor plans or the approved equipment roomschedule.
3. Placetheproperamountofequipmentineachareainaccordancewithplansorschedule.
4. Proceedtoinstalltheequipmentasoutlinedonthefollowingpages.RefertotheinstallationinstructionsincludedwiththeDraftstopsystemformoredetailedinformation.
Upper Channel or Backplate Assembly1. Establish a level chalk line on the wall at a height specified for the
topoftheenclosure.Selectmountinghardwarewhichissuitableforthetypeofwallconstructionusedandmounttheupperchannelor backplate flush with the chalk line. When mounting, use the prepunched holes and push the hardware through the spongegasket.
Note:a. Theupperchannelisprovidedwithcontinuous5/16" diameterholeson2"centersformounting.b. Whereused,thebackplateassemblyconsistsofafullbackplate
weldedtothebackoftheupperchannel.Fastenthebackplateatthebottomaswellasatthetop.
2. Wall-to-WallApplication:Startingattheleftside,runtheupperchannelorbackplatealongthewall.Notethattheupperchannelorbackplateisinstalledbehindthewalltrimaswellastheenclosure,becauseboththeenclosureandwalltrimrestinthetopgrooveoftheupperchannel.
3. Wall-to-EndApplication:Runtheupperchannelorbackplatefromthewalltoapointwheretheenclosurewillend.SeeDraftstopinstallationinstructionsfordetailsofendcapinstallation.
4. End-to-EndApplication:Runtheupperchannelorbackplatethesamelengthastheenclosure.SeeDraftstopinstallationinstructionsfordetailsorendcapinstallation.
5. Forinsidecorners,runtheupperchannelorbackplateintothecorner, butting the pieces together. If desired, pieces may bestoppedshortofthecorneramaximumofoneinch.RefertotheDraftstopinstallationinstructionsfordetailsof thecorner triminstallation.
The Draftstop enclosure and unit ventilator end panel should bematched, to ensure proper airflow. Tables 31-34 show the various end panels available, follow installation instructions included with theendpanels.
NOTICEThe following information is a general outline for installing the Draftstop system. Refer to the specific installation instructions provided with the Draftstop system equipment.
Draftstop Bar Grille and Adjustable Damper
Piping Area
Figure 128 - Typical DraftStop Enclosure
AllDimensionsinInches
165/8"(422mm)DeepEndPanels
217/8"(556mm)DeepEndPanels
TopView
EndViewWith4"x18"
(102mmx457mm)Cut-out
EndViewWith21/2"x7"
(64mmx178mm)Cut-out
EndViewWithNoCut-out
EndViewWith4"x22"
(102mmx559mm)Cut-out
EndViewWith2"x51/4"
(51mmx133mm)
StepDown
Table 31. 1" (25mm) End Panel Dimensions – Floor Unit Ventilators
27 7/8"(708mm)
27 7/8"(708mm)
7"(178mm)
2 1/2"(64mm)
1"(25mm)
27 7/8"(708mm)
18"(457mm)
4"(102mm)
1"(25mm)
27 7/8"(708mm)
22"(559mm)
4"(102mm)
1"(25mm)
16 5/8"(422mm) 1"
(25mm)
27 7/8"(708mm)
27 7/8"(708mm)
7"(178mm)
2 1/2"(64mm)
1"(25mm)
27 7/8"(708mm)
18"(457mm)
4"(102mm)
1"(25mm)
27 7/8"(708mm)
22"(559mm)
4"(102mm)
1"(25mm)
21 7/8"(556mm) 1"
(25mm)
27 7/8"(708mm)
2"(51mm)
5 1/4"(133mm)
IM 817-2 Page 51 of 58
Installing Unit Ventilator End Panels:See Figure 131.Accessory end panels are shipped separately withhardwareandkickplate,orsimulatedkickplateadhesivetapeusedon165/8"units(only).Aligneachendpanelwiththetopandfrontedgesoftheunitventilator.Attacheachendpaneltotheunitventilatorusingthehardwareprovided.
1"ENDPANEL
277/8"(708mm)
30"(762mm)
28"(711mm)DeepEndPanels
Table 32. 1" (25mm) End Panel Dimensions – Non-Standard 28" Deep Floor Unit Ventilators
TopView16 5/8"
(422mm) 6"(152mm)
21 7/8"(556mm) 6"
(152mm)
Table 33. 6" (152mm) End Panel Dimensions – Floor Unit Ventilators
EndViewWithNoCut-out
27 7/8"(708mm)
AllDimensionsinInches
TopView
EndViewWith4"x18"
(102mmx457mm)Cut-out
EndViewWith21/2"x7"
(64mmx178mm)Cut-out
EndViewWithNoCut-out
EndViewWith4"x22"
(102mmx559mm)Cut-out
EndViewWith2"x51/4"
(51mmx133mm)
StepDown
TopView28"
(711mm) 6"(152mm)
EndViewWithNoCut-out
Table 34. 6" (152mm) End Panel Dimensions – 28" Non-Standard Floor Unit Ventilators
Floor
Figure 129 - Typical DraftStop Enclosure
MountingChannelDetail
Open
3⁄8" (10mm) Max. Screw (By Others)
11⁄4" (32mm)
2" (51mm)
Enclosure
SlideClosed
12" (305mm),
20" (508mm)
& 24" (610mm)
53⁄8"31⁄8"
27 7/8"(708mm)
27 7/8"(708mm)
22"(559mm)
4"(102mm)
1"(25mm)
28"(711mm) 1"
(25mm)
27 7/8"(708mm)
27 7/8"(708mm)
Finned Radiation SystemFinnedradiationdown-draftcontrolisavailableforthosewhopreferit.Madeoffurniture-qualitysteelanddesignedtocomplementtheunitventilatorstyling,itisparticularlyappropriateforabuildingwithverylargeexpansesofwindowwheretheDraftStopsystemisnotused,andforuseinotherpartsofthebuilding.
Figure 130 - Typical Finned Radiation Piping
Control – Hydronic Radiation
Auxiliary Radiation Auxiliary Radiation
Unit VentilatorCoil
Unit Ventilator Control Valve*(controlled by MicroTech II)
Radiation Control Valve(controlled by MicroTech II)
*Not required with Face & Bypass control
Figure 131 - Install End Panels
Page 52 of 58 IM 817-2
Oiling the Fan Shaft End Bearing:
Do not attempt to operate the unit fans until the fan bearings have been oiled. Oiled bearings provide smooth, and quiet operation of the fan system.
End Panel
YC-1934
End
of U
nit
1/4-20 Tinnerman Nut, Clip on End Panel
1/4-20 x 1/2 Screw & 1/4 Flat Washer
1/4-20 Tinnerman Nut, Clip Over Lower Hole in Unit Corner Angle.
1/4-20 x 1/2 Screw & 1/4 Flat Washer
5" Unit Ventilator Start-up
1. Before proceeding inspect the fan system, ensure all parts arealignedproperlyandmovefreely.Inspectfansandfandischargearea for obstructions. Rotate fan manually. Check that a clean filter isinstalledandareainfrontofunitventilatorisfreeofdebris(seefigure 124). All panels should be in place and properly fastened. Checkforoutdoorairleaksandcondensation.Ensurethecoilsectionisproperlysealedusingtheinsulatingfoamdonutssupplied.
2. Aftertheunitventilatorhasbeenproperlyinstalled,activateunitelectrical power and applicable chilled water/hot water/steam/refrigerantsystems.
3. Usingtheapplicablecontrol,activatetheunitventilator.Dependingon the operating mode selected, the dampers, fans, and othercomponentsshouldoperateasneeded.
4. Runtheunitventilatorfortenminutes,listeningandobserving.Fans should be operating correctly, and rotating in the properdirection,withoutunusualnoise.Likewise,theunitshouldbefreeofsheetmetalrattlesand/orunusualnoises.Allpanelsshouldbeinplaceandproperlyfastened,andcheckedforairleaksandcondensation.
Remove debris, dust, dirt, and any obstruction from the area in front of the return air intake grille at the floor as this will affect unit performance. If a draftstop system has been installed be sure that all draftstop intake grilles are unobstructed.
SeeFigure134foroilingpoint.Accesstofanshaftbearingisthroughlefttopaccessdoor.Lifttheoilercap.Oil,usingafewdropsofhighgradeSAE20or30nondetergentoil.Donotover-oil.
G.E. motor manufacturer recommends not oiling the fan motor .
Access To Fan Shaft Bearing Through Left Top Access Door
Figure 134 - Oiling Point
Bearing Oiler Cap
Prepare Unit Ventilator(s) for Start-up
Tinnerman Clips
Tinnerman Clips
Screws (insert through end panel and thread into tinnerman clips on unit subbase)
Screws (insert through upper mounting holes inside unit end compartment, and thread into tinnerman clips on end panel)
End Panel w/Cut out
Figure 132 - Install End Panels With Provided Hardware (1" End Panel Shown)
1. Position(YC-1934)bracketonwallsoangleis5"fromendofunitand near bottom (see figure 133).
2. Markanddrillrequiredholeforfasteningdevice(notincluded).3. Attachbrackettowall.4. Attachendpanel.Bracketshouldpreventmovementofendpanel
towardendofunitwhenpressureisappliedtoendpanel,readjustbracketifnecessary.
Figure 133 - Install End Panels With Provided Hardware (6" End Panel Shown)
CAUTION
NOTICE
NOTICE
IM 817-2 Page 53 of 58
Units must have a filter installed when operating. Operation without a filter can compromise unit performance due to build up of dust and dirt on components.
Filter(s)
Turnoff theunit, (fanspeedswitchoruniton/offswitchis locatedbehind the right front end compartment panel). Remove the centerfront panel, pull out the filter and replace with a clean filter. Replace thecenterpanelandrestarttheunit.
Filters should be replaced during the first week of placing into service topreventdirtcarry-overintotheinternalsoftheunitandbackintothe classroom, (see figure 135). A periodic filter changeout program should be established. Filters should be checked monthly or moreoften ifconditions indicate.Filtersare included inallunits.AAF®-HermanNelson® single-use filters are standard on all but electric heat units, which come with permanent wire mesh filters. Permanent wire mesh and renewable media filters are available for non-electric heat units, in lieu of single-use filters.
• Single-usefiltersfeatureAmerglasmedia.Theyaredesignedtobeusedonceanddiscarded.
• Permanentfiltersare metal filters that may be removed for cleaning andreusednumeroustimes.
• Renewablemediafilters (figure 134) consist of a heavy painted metalstructuralframeandrenewableAmerglasmedia.
Turn off unit before servicing to avoid danger of injury from rotating fans.
Dirty or clogged filters can impact unit performance, resulting in damage to the unit.
12" Left Front Access Panel
Motor
12" Right Front Access Panel
Top Access Doors
Figure 135 - Filter installation
Complete Check, Test and Start Procedure (Included in the shipping envelope in the end compartment oftheunit).ProvidecompletedCheck,TestandStartproceduretolocalAAF®-HermanNelson® representative and to specifying engineer toverifyproperstart-upwascompleted.
Electric heat units should ONLY use permanent wire mesh filters. Filters other than wire mesh are not intended for electric heat units, and can cause unit damage, property damage or personal injury.
Filter
Renewable Media (Single-use And Permanent Wire Mesh Filters Also Available.)
Structural Frame
Installer/Owner’s ResponsibilityProtect your investment - read carefully
YourAAF-HermanNelsonexpresswrittenlimitedwarrantydoesnotcoverequipmentfailuresthatarecausedbymisuse,abuse,mis-installation,failuretomaintaintheunit,etc.So,forexample,thefollowingdamageisnotcoveredbywarranty:
1. Progressivedamagetomachinefromfailuretocheckandtestatstart-up.
2. Damageresulting fromhandlingduring installationordamageresultingfromtransportation.
3. Incorrect or fluctuating power supply.4. Damageresultingfromfailuretokeepevaporatorcoilandintake
clean.5. Damageresultingfromfreezingwaterorcondensate,inadequate
orinterruptedwatersupply,useofcorrosivewater,rearrangementofunitpipingsystem,foulingorrestrictionofthewatercircuitbyforeignmaterial.
6. Inaccessibilityofunitforserviceorpartsinstallationthatpreventsproperequipmentoperation.
7. Damageresultingfromtheuseoftheunitinacorrosiveatmosphere,ie.,cleaningmaterials,fumes,etc
8. Damage caused by not cleaning or replacing filters.9. Damage caused by accident, alteration of unit design, or
tampering.
PleasecompleteandreturntheCheck,TestandStartdocumentimmediatelytoprotectyourwarranty.
CAUTION
CAUTION
CAUTION
CAUTION
©2007 McQuay International • www.mcquay.com • 800-432-1342
IM 817-2 (12-07)
®
McQuayTrainingandDevelopment
Now that you have made an investment in modern, efficient McQuay equipment, its care should be a high priority. For training information on all McQuay HVAC products, please visit us at www.mcquay.com and click on training, or call 540-248-9646 and ask for the Training Department.
WarrantyAll McQuay equipment is sold pursuant to its standard terms and conditions of sale, including LimitedProduct Warranty. Consult your local McQuay Representative for warranty details. Refer to Form933-43285Y. To find your local McQuay Representative, go to www.mcquay.com.
This document contains the most current product information as of this printing. For the most up-to-dateproduct information, please go to www.mcquay.com.
Manufactured in an ISO Certified Facility