lead/lag controller · • 1 amp maximum per terminal. • 4 amp maximum total load. ease of use...

P/N 01661

Lead/Lag ControllerModel LL357D4

Operational Specifications

• ThermostatRange:45ºFto90ºF(7ºCto32ºC)

• Accuracy:±1ºF(±½ºC)

• ChangeoverTemperatureDifferential(separationbetweentheheatsetpointandthecoolsetpoint):2ºFto9ºF(1.0ºCto4.5ºC)

• FirstStageTemperatureDifferential(numberofdegreesbetweenthesetpointtemperatureandthe“turnon”temperature):1ºFto3ºF(.5ºCto1.5ºC)

• SecondStageTemperatureDifferential(numberofdegreesbetweenwhenstage1turnsonandwhenstage2turnson):1ºFto6ºF(.5ºCto3.0ºC).

• MinimumCoolTemperatureSetPoint:Adjustablefrom45ºFto75ºF(7ºCto24.0ºC).

• MaximumHeatTemperatureSetPoint:Adjustablefrom55ºFto90ºF(13ºCto32.0ºC)

• StagedOFFOutputs:Airconditionerswillturnoffindependently.

Electrical Specifications

• Compatiblewithstandard24-voltAC,2stageheating/coolingsystems.

• 24Voltcontrol(18to30VAC).

• 1ampmaximumperterminal.

• 4ampmaximumtotalload.

Ease of Use

• BacklightingofthelargedisplaymakestheLiquidCrystalDisplay(LCD)easytoread.

• MostfrequentlyusedkeysarelocatedbytheLCDforquick&easyaccesstoinformation.

• Easyinstallation,setupandsystemtestssavestime.

• Setpointsarepermanentlyheldinmemoryandretainedduringpoweroutages-nobatteriesrequired.

• Programmingnotrequired.

• Digitaldisplayshowstemperaturein°For°C.

• RoomTemperatureOffset:Usedtocalibratedisplayedroomtemperaturewithactualroomtemperature

• StatusIndicatorLight:Indicateswhichstageisrunning.Greenlightmeanscooling&redlightmeansheating.

Model LL357D4 Lead/Lag ControllerTheMarvair®LL357D4isacompletecontrolpackage

designedtooperateafullyorpartiallyredundantairconditioningsystem.Itconsistsofatwo-stageheatandcoolelectronicthermostatandasolidstatetimer.ItcanbeusedwitheithertheMarvairComPac®Iverticalpackagedwallmountairconditioner,ouruniqueComPac®IIairconditionerwithbuilt-ineconomizerandmanyoftheMarvairEnvironmentalControlUnits(ECU).TheLL357D4providesenvironmentalcontrolandthesecuritydemandedbythecommunicationshelterindustryforaback-upunit.Thelead/lagcontrollerinsuresequalwearonbothairconditionerswhileallowingthelagunittoassistupondemand.Phasingofairconditionersisnotrequiredforproperoperation.Theenvironmentallysafe,mercury-freeLL357D4isfactorywired,testedandmountedinanenclosureforquickinstallation.TheLL357D4whenusedwiththeheatpumpadapter,ModelLL357H,providescontrolofredundantheatpumpsystems.RefertotheHeatPumpAdapterProductBulletinfordetails.

Specification/Features

LL357D4 PDS 4.2011 rev. 1

LL357D4 PDS, 4.2011 2

Specification/Features (cont'd)Ease of Installation

• Wiringconnectionsinsensitivetothephasingoftheairconditioners.

• Temperaturesensorbuiltintotheunit(optionalremotesensoravailable).

• Easyterminalconnectionsforthermostatwire.

Timing Device

• Solidstatetimerwithboth3.5and7daychangeovercapability.Timingaccuracy±5%.

• Momentarypushbuttonforacceleratedmanualtimeradvance.(7seconds=7days)

• Lightemittingdiodesindicatepoweronandidentifiestheleadunit.

Enclosure

• 16gaugeappliancewhite,pre-paintedaluminum.

• Provideslowprofilethermostatmounting.

• Openingsincoverfor“LED”indicationofpoweronandforleadunit.

• Doublesasjunctionboxforcontrolwiringtoairconditioners.

Low Voltage Wiring1. Allwiringmustcomply

withlocalcodesandordinances.

2. Disconnectpowertopreventelectricalshockorequipmentdamage.

3. Ondualunits,wiretheairconditionersaccordingtothewiringdetail.

4. Providepowertothecontroller.

NOTE:

• Terminals 5 and 7 on the ComPac® I & ComPac® II air conditioner’s terminal board are dry contacts which can be used for remote signalling in the event of equipment cut-off on refrigerant pressure limit.

• For continuous indoor fan operation, install a jumper between terminals 8 and 3 and remove jumper between 1 and 3.

• Also, terminals 8 and 10 can be connected to a normally closed smoke or fire detector to cause equipment shutdown when the circuit is opened. (Remove factory jumper.)

LED Operation• Green (middle light) means

power on to both units.

• Red (left and right lights) indicates the lead unit.

3 LL357D4 PDS, 4.2011

Sub-base Illustration

Important Safety PrecautionsWARNING!:Always turn off power at the main power supply before installing, cleaning, or

removing thermostat.• Thisthermostatisfor24VACapplicationsonly;donotuseonvoltagesover30VAC• Donotshortacrossterminalsofsystemcontroltotestoperation;thiswilldamageyourthermostat

andvoidyourwarranty• Allwiringmustconformtolocalandnationalelectricalandbuildingcodes• Usethisthermostatonlyasdescribedinthismanual

To Install LL357D4 Thermostat/ControllerELECTRICAL SHOCK HAZARD – Turn off power at the main service panel by removing the

fuse or switching the appropriate circuit breaker to the OFF position before removing the existing thermostat.

IMPORTANT:Thermostatinstallationmustconformtolocalandnationalbuildingandelectricalcodesandordinances.

Note:Mountthethermostataboutfivefeetabovethefloor.Donotmountthethermostatonanoutsidewall,indirectsunlight,behindadoor,orinanareaaffectedbyaventorduct.

1. Turnoffpowertotheheatingandcoolingsystembyremovingthefuseorswitchingofftheappropriatecircuitbreaker.

2. Putthermostatbaseagainstthewallwhereyouplantomountit(Besurewireswillfeedthroughthewireopeninginthebaseofthethermostat).

3. Marktheplacementofthemountingholes.

4. Usingadrillbit,drillholesintheplacesyouhavemarkedformounting.

5. Alignthermostatbasewithmountingholesandfeedthecontrolwiresthroughwireopening.

6. Usescrewstomountthermostatbasetowall.

7.Insertstripped,labeledwiresinmatchingwireterminals.SeeWiringDiagrams.CAUTION!:Besureexposedportionofwiresdoesnottouchotherwires.

8.Tightenscrewsonterminalblock.Gentlytugwiretobesureofproperconnection.Doublecheckthateachwireisconnectedtotheproperterminal.

LL357D4 PDS, 4.2011 4

9.Sealholeforwiresbehindthermostatwithnon-flammableinsulationorputty.

10.Replacecoveronthermostat.

11.Turnonpowertothesystematthemainservicepanel.

12.Testthermostatoperationasdescribedin“TestingtheThermostat”(Page6).

Remote Sensor Installation (optional)1. Removecoverfromremotesensorhousing.

2. Selectanappropriatelocationformountingtheremotesensor.

3. Mountremotesensorunitusinghardwareprovided.

4. Installtwowiresbetweenremotesensorandthermostat(useshieldedcablethatisadequatelygrounded).

• Wire1shouldrunbetweentheS1terminalonthethermostatandtheS1terminalontheremotesensor

• Wire2shouldrunbetweentheS2terminalonthethermostatandtheS2terminalontheremotesensor

5. Disablethemainsensor(R12)onthethermostatbycuttingitfromthecircuitboard.

Configuration ModeTheconfigurationmodeisusedtosettheLL357D4thermostattomatchyourheating/coolingsystem.

TheLL357D4functionswithairconditionerswithelectricheatsystems.

ToconfiguretheLL357D4,performthefollowingsteps:

1. VerifythattheLL357D4isintheOFFmode.PresstheSYS(left)buttonuntilmodedisplays.

2. Removethecoverofthethermostatbygentlypullingnearoneofthecornersatthetopofthethermostat.

3. PresstheCONFIGbuttonforonesecondwhilethethermostatisintheOFFmode.

UsetheUpandDownbuttonstochangesettingswithineachscreen.

PresstheRightbuttontoadvancetothenextscreen.

PresstheLeftbuttontoreturntopreviousscreen.

4. ToexitConfigurationMode,presstheCONFIGswitchfor1second.

Configuration Mode Settings

ThesetupscreensfortheConfigurationModefollow:

1. TemperatureScale(°For°C)ChooseFahrenheitorCelsius.

PresstheUporDownbuttontoselectscale.


2. 1st Stage Temperature Differential(1°Fto5°F)(0.5°Cto2.5°C)Setthenumberofdegreesbetweenyour“setpoint”temperatureandyour“turnon”temperature.Marvairrecommends2ºF.

PresstheUporDownbuttontosetdifferentialvalue.


5 LL357D4 PDS, 4.2011

3. 2nd Stage Temperature Differential(1°Fto5°F)(0.5°Cto2.5°C)Setthenumberofdegreesbetweenwhenstage1turnsonandwhenstage2turnson.Marvairrecommends2ºF.

PresstheUporDownbuttontoselectdifferential.


4. Staged Off OutputsSelectwhethertheoutputsforheatingandcoolingarestagedoffindependentlyoraresatisfiedsimultaneously.Select“1”,outputsstagedindependently.

1=outputsstagedoffindependently

0=outputsoffsimultaneously

PresstheUporDownbuttontoselect.


5. Minimum Deadband(1°Fto9°F)(1°Cto5°C)SettheminimumseparationbetweenheatsetpointandcoolsetpointinAutoChangeoverMode.Marvairrecommends3ºF.

PresstheUporDownbuttontosetdeadbandvalue.


6. System–Setforheatpump,non-HeatPump(airconditioner),reversingvalveoperationandnumberofcompressorsinyoursystem.Setupfor“Non-HeatPump”andTypeofHeat“Electric”.

PresstheUporDownbuttontoselectscale.




7. Auxiliary Delay ON–(0-30minutes)Setthedelaytimeinminutesforauxiliaryheattobelockedoutafteracallforsecondstage.Thisextrasavingsfeatureisusedtotemporarilylockoutauxiliaryheatdevices,allowingjustheatpumptotrytosatisfyheatcall.Setto0minutes.



8. Lockout(0-8°,COOL-HEAT)Selectthenumberofdegreessettemperaturecanbechangedduringkeypadlockout.COOL-HEATlockoutallowsadjustmentofthesettemperaturestothemaximumheatsettemperatureselectedinStep9andminimumcoolsettemperatureselectedinStep10.

Note:Themodecannotbechangedwhenthethermostatislocked.



Choose System Reversing Valve Active

Number of Compressorsor Compressor Stages

Type ofHeat

HeatPump

HP O 1

HP b 1

HP O 2

HP b 2

Non-HeatPump

Heat Gas

Heat Electric

LL357D4 PDS, 4.2011 6

Configuration Mode Settings (cont'd)

9. Maximum Heat Setpoint(45°Fto90°F)(7°Cto32°C) Adjusttocontrolthemaximumheatsettemperatureallowed.Marvairrecommendsamax.heat setpointof78ºF(25.6ºC)



10. Minimum Cool Setpoint(45°Fto90°F)(7°Cto32°C) Adjusttocontroltheminimumcoolsettemperatureallowed.Marvairrecommendsaminimum coolsetpointof68ºF(20ºC).



11. Room Temperature Offset(+9°Fto-9°F)(+4.5°Cto-4.5°C) Adjusttocalibratedisplayedroomtemperaturetomatchactualroomtemperature.Note:When notsetto0,ºwilldisplay.



12. Temperature Sensor (1-3)

1.Onlyon-boardsensordeterminesroomtemperature.

2.Onlyremotesensordeterminesroomtemperature.

3.Averagetemperatureofon-boardandremotesensor.

Note:Ifthereisnoremotesensor,option1mustbeselected.



13. Cooling Fan Delay Off Time(0,30,60,90seconds) Selectthefanpurgetimeforcooling.Marvairrecommends0seconds.



14. Status Indicator Light (Led0,1,2) Marvairrecommends1.

0=Statusindicatorneveron

1=Statusindicatoronwithfirststage

2=Statusindicatoronwithsecondstage


PresstheCONFIGbuttonfor2secondstoexitconfiguration.

7 LL357D4 PDS, 4.2011

Testing the ThermostatNote: The LL357D4 does not require the units to be in phase.

Procedure: (A/C Testing with LL357D4 Lead/Lag Control for Two Units)

UP-Usedtoincreasethetime,settemperaturesandtoadjustconfigurationsettings.

DOWN-Usedtodecreasethetime,settemperaturesandtoadjustconfigurationsettings.

SYS(left)-UsedtochangefromOFF,HEAT,COOLandAUTOchangeovermodes.

RIGHT-Usedtoturnonandofftheindoorfan.

UP, SYS and RIGHT-Heldinsimultaneouslyfor10secondstolockandunlockthethermostat.

DOWN and SYS-Pressedsimultaneouslytodisplayoutdoortemperatureifoutdoorremotesensorisconnected.

1. Setthecoolingtemperatureonthewallthermostattoapointhigherthantheambienttemperature.Settheheatingtemperaturetoatemperaturethatislowerthantheambienttemperature.Turntheselectorswitchtothe“off”position.

2. SetthetimedelayonunitNo.1to“3”minutes,andNo.2to“5”minutes.

3. Setthechangeoversettingoftheenthalpycontroltothe“d”setting(ComPac®IIA/Conly).

4. ProvidepowertoA/Cunitsandturndisconnectson.

5. Checkincomingpowertoeachunit.Forunitsdesignedforoperationon208/230v,60hzpowersupply,thetransformerisfactorywiredfora230powersupply.Fora208powersupplyremovetheorangeleadfromthetransformerandconnecttheredlead.Insulatetheorangelead.

6. Cooling.UsetheSYSswitchtosetthethermostatto“AUTO”.Slowlylowerthecoolingtemperatureuntiltheswitchcloses.Theindoorfanshouldoperateontheleadunit.Oncetheindoorfanturnson,allowapproximately3to5minutesforthecompressortostart.Notethattheoutdoorfanmaynotcomeonimmediatelybecauseitiscycledbyrefrigerantpressures.Next,lowerthetemperatureuntiltheswitchcloses.Followtheaboveproceduresforthelagunit.

Thegreenlightontheleadlagcontrolshouldbeon.Oneamberlightwillbeontoidentifytheleadunit.Theotherlightshouldbeoff.Ifthelagunitcomesonwiththeleadunitthelightforthelagunitwillnotcomeon.Youshouldneverhaveall3lightsonatonetime.

Allowtheunitstorunfor2to3minutesthencheckthetemperaturedifferentialbetweenthereturnairandthesupplyairwithdigitalthermometer.Thetemperaturedifferentialshouldbebetween12and20degreesdependingonambienttemperature.

Next,slowlyraisethecoolingtemperatureuntiltheswitchopens.Thecompressorandoutdoorfanshouldturnoff.Theindoorfanwillcontinuetorunfor“90”secondsuntilthefanpurgetimesout.Raisethetemperatureuntiltheswitchopens.Theleadunitwillshutdownaccordinglytothesameproceduresasoutlinesabove.

Note:(ComPac®IIA/Conly)Tocheckthesystemoperationunderdifferentambientconditions,theairtemperatureandenthalpysensorsmustbe“tricked”.Whenoutdoorambientconditionsarehigherthanthecontrolsetting,acomponentcooleraerosolmaybesprayeddirectlyintotheenthalpysensortostimulatelowenthalpyconditions,causingtheeconomizerdampertoopen.

Alternately,whenoutdoorconditionsarelowerthanthesetpoint,asourceofheatsuchasahairdryercanbedirectedontheenthalpysensortosimulatewarmconditions,whichwillbringonmechanicalcoolingandstartthecompressor.

7.Heating.Slowlyraisetheheatingtemperatureuntiltheswitchcloses.Thefanandelectricalheatshouldimmediatelycycleon.Theunitshouldstartblowingwarmairin2to3minutes.Next,raisethetemperatureuntiltheswitchcloses.Followtheaboveproceduresforlagunit.

Holdthemanualadvancebuttoninforninesecondstheleadlaglightsshouldswitch.Next,slowlylowerthetemperatureuntiltheswitchesopen.Thelagunitshouldshutdownimmediately.Next,slowlylowerthetemperatureuntiltheswitchopens,theleadunitshouldshutdownimmediately.

8.Replacethermostatcoverandpanelsontheunit.

LL357D4 PDS, 4.2011 8

Mode of OperationForanunmannedsite,AutoMUSTbeselectedastheOperatingMode.Sincethecontrolmodulein

theLL357D4doesnothavea"G"input,thefanselectorswitchonthethermostatisnotfunctional.Innormaloperation,thefanandthecompressoroperatesimultaneously.Forcontinuousfanondualunitinstallations,installajumperwirebetweenterminals8and3andremovethejumperwirebetween1and3.Theseterminalsareonthelowvoltageterminalboardintheairconditionercontrolbox.

TherearefourpossibleoperatingmodesfortheLL357D4,Off,Cool,Heat,andCool&Heat(auto-changeover).ModesareaccessedbypressingtheSYS(left)button.

OFF Mode

•Inthismode,thethermostatwillnotheatorcool.

Heat Mode

•Inthismode,thethermostatcontrolstheheatingsystem.Whentheheatison,theflameiconappearsonthedisplay.

Cool Mode

•Inthismode,thethermostatcontrolsthecoolingsystem.Whenthetheunitiscooling,thesnowflakeiconappearsonthedisplay.

Cool and Heat Mode (AutoChangeover)

•Inthismode,thethermostatcontrolsthecoolingandheatingsystems,automaticallychangingoverfromonetotheotherasneeded.

•Thetimingdisplayalternateswiththesettemperatureevery10secondsinthecoolandheatmode.

Lockout Feature

Thethermostathasabuttonlockoutfeaturesothemodecannotbechangedandthetemperatureadjustmentislimited.SelecttheappropriatelockoutfromConfigurationModeSettings.

ToactivatetheLOCKfeature:

1.SimultaneouslypresstheSYS,RIGHTandUPbuttonsfor10seconds.

2.Thelockouticonwilldisplayandthelockoutfunctionwillbeenabled.

TodeactivatetheLOCKfeature,repeatsteps1and2above.

LL357D4 PDS, 4.2011 9

Troubleshooting

Symptom Remedy

Nodisplay Checkfor24VACatthermostat;displayisblankwhen24VACisnotpresent.

Indoorblowerdoesnotturnon Verifywiringiscorrect.ChecksettingsinConfigMode,No.6,“Settings”.

Allthermostatbuttonsareinoperative. Verify24VACispresent;unitlocksoutwhen24VACnotpresent.

Noresponsewhenfirstbuttonispressed. Firstbuttonpressedonlyactivatesbacklight.

AirconditionersturnsOnandOfftoofrequently(shortcycles)

Increasetemperaturedifferential.SeeConfigMode,steps2&3.

StatusindicatorlightdoesnotcomeonduringcallforCoolingorHeating.

Turnstatusindicatorlightfunctionon.SeeConfigMode,Step14.

Roomtemperatureisnotcorrect. Calibratethermostat.SeeConfigMode,step11.

Lockiconisdisplayedwhenanybuttonispressed.

Thermostathasthelockoutfunctionactivated.SeeLockoutFeatureandConfigMode,step8.

ErondisplayinsteadofSEntemperature CheckforabadconnectionatS1andS2terminals.SeeConfigMode,step12

Airconditionerisnotcoolingorheating. Verifywiringiscorrect.Gentlypulloneachwiretoverifythereisagoodconnectionattheterminalbloc.

Problemnotlistedabove PressResetonce.Timeanddayarereset;configurationssettingsarenotchanged.

LL357D4 PDS, 4.2011 10

Configuration ModeToenterConfigurationmode:

1. VerifythatthethermostatisintheOFFmode.

2. PresstheSYS(left)buttonuntiltheoffmodedisplays.

3. Removethethermostatscoverbygentlypullingononecorneratthetopofthethermostat.

4. PresstheCONFIGbuttonfor1second.

5. Presstheupordownbuttontochangethesettingswithineachscreen.

6. PresstheRIGHTbuttontoadvancetothenextscreen.Presstheleftbuttontoreturntoprevious

Screen Number Description

Marvair Recommended Selection Default

1 TemperatureScale°For°C Asdesired F

2 1stStageTemperatureDifferential1°Fto3°F(0.5°Cto1.5°C) 2°F 1°

3 2ndStageTemperatureDifferential1°Fto6°F(0.5°Cto3.0°C) 2°F 2°

4 StagedOffOutputs1=outputsstagedoffindependently2=outputsstagedoffsimultaneously

Select11 1

5 MinimumDeadband2°Fto9°F(1.0°Cto4.5°C)

3°F 5°

6 SystemChoosefromheatpump,non-heatpump(airconditioner),reversingvalveandnumberofcompressors.

Select“non-heatpump”and“Electric”1

GAS

7 AuxiliaryDelayOnSetthetimedelay(inminutes)foraux.heattobelockedoutafteracallforsecondstage

Setto0minutes.1 0:00

8 LockoutSelectthenumberofdegreesthatthesettemperaturecanbechangedduringkeypadlockout.

Asdesired 00

9 MaximumHeatingSetpoint55°Fto90°F(13°Cto232.0°C)

Nohigherthan78°F(25.6°C) 90°

10 MinimumCoolingSetpoint45°Fto75°F(7.0°Cto24.0°C)

Nolowerthan68°F(20°C) 45°

11 RoomTemperatureOffset+9°Fto-9°F(+4.5°Cto-4.5°C)

Asdesired 0°

12 TemperatureSensor1=Onboardtemperaturesensor2=Onlyremotesensor3=Avg.temperatureofon-boardsensorandremotesensor

Asdesired 1

13 CoolingfanDelayOffTime0,30,60,90seconds

0seconds 0

14 Statusindicatorlight0=statusindicatorneveron1=statusindicatoronwithfirststage2=statusindicatoronwithsecondstage

Select1 1

ToexittheConfigurationMode,presstheCONFIGswitchfor1second.Note:Theredlightindicatestheunit(s)isintheheatingcycleandthegreenlightindicatethattheunit(s)isinthecoolingcycle.1Settingsandselectionsinitalicsarerequiredsettings/selections.

LL357D4 PDS, 4.2011 11

Notes

LL357D4 PDS, 4.2011 12

P.O.Box400•Cordele,GA31010156SeedlingDrive•Cordele,GA31015Ph:229-273-3636•Fax:229-273-5154Email:[email protected]• Internet:www.marvair.com

Please consult the Marvair® website at www.marvair.com for the latest product literature. Detailed dimensional data is available upon request. A complete warranty statement can be found in each product’s Installation/Operation Manual, on our website or by contacting Marvair at 229-273-3636. As part of the Marvair continuous improvement program, specifications are subject to change without notice.

© Marvair®, Division of AIRXCEL™, Inc. 4.2011

Notes

lead/lag controller · • 1 amp maximum per terminal. • 4 amp maximum total load. ease of use...

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