operation maintenance horizon - homesteadhvacrknowlagecenter.homestead.com/abswringdiagram.pdf ·...

Horizon™

Single-Stage Steam or Hot WaterAbsorption Chiller

ABS-M-10A-E4

Operation Maintenance

Unit Model: ABSD

X39640650010

How to Use This Manual

ContentsThis manual describes the operationand maintenance requirements forthe Trane Horizon Single-StageSteam or Hot Water AbsorptionChiller. The instructions are intendedto provide the machine operatorwith sufficient detailed informationto safely operate the chiller Thismanual has been developed andapproved within a quality systemcertified as conforming to ISO 9001.

General Information

ABS-M-10A-E4© 2001 American Standard Inc. All rights reserved.

Contents

ABS-M-10A-E4 3

Owner

General InformationMechanical Specification, Component Identification,Unit Nameplate Location and Description, ModelNumber Description

Sequence of OperationMachine Solution Cycle, Control Panel and UnitControls, Machine Sequence of Operation, MachineControl Strategies, Purge System Operation

Operator GuideOperator Display Reports, Settings, Test andDiagnostics, Adjustable Frequency Drive DisplayMenu

MaintenanceDaily, Seasonal, Purge, Inspection Items,Evaporator, Absorber and Condenser Care,Adjustable Frequency Drives, Pumps, FilterReplacement

Troubleshooting/Diagnostics

Troubleshooting/DiagnosticsControl Panel Diagnostics, AFD Diagnostics, Pumps

Troubleshooting Checklist

Unit Wiring DiagramsElectrical Connections, Field Wiring, Electrical Data,Unit Wiring Diagrams

45

62

63

64

2

13

31

ABS-M-10A-E44

Mechanical Specifications

GeneralThe Trane Horizon™ Model ABSDchiller is a complete single effectsteam or hot water fired absorptionchiller package built in an ISO 9001environment. Chiller consists ofgenerator/condenser section,evaporator/absorber section,controls, pumps, heat exchanger,and energy control valve. AllHorizon chillers are of hermeticdesign, factory assembled and leaktested prior to shipment. Horizonchillers can be separated andshipped disassembled for riggingpurposes. Horizon chiller controlsare factory mounted and wiredincluding micro electronic controlpanel, sensors and purge system,energy valve can be factorymounted and wired as an option onsteam fired units. Horizon chillersare painted prior to shipping withtwo coats of a water base air dryprimer. Standard method ofshipment is by truck from the USA.

Generator/Condenser-Evaporator/AbsorberThe shell material is carbon steel.Standard generator tube material iscupro-nickel, evaporator is copper,absorber is cupro-nickel andcondenser is copper. Tubes aremechanically rolled into the tubesheets and are replaceable fromeither end. Condenser, evaporatorand absorber tube supports arefixed. Generator consists of fixedand floating tube supports to allowfor even tube expansion. Solutionspray systems are replaceable fromend of unit without sacrificing thehermetic integrity of the unit.

Generator/Condenser-Evaporator/AbsorberDesign working pressure for thewater boxes is 150 psig [10.5kg/cm2]. All tube bundles are testedat 150 percent of design workingpressure. All water boxes havegasketed removable covers foraccess. Optional Marine type waterboxes can be provided on thecondenser and absorber section.Water connections are provided witheither victaulic or raised-faceflanged connections.

Heat ExchangersA brazed plate solution heatexchanger is provided to reduceenergy use and improve unitperformance. Heat exchangersurfaces are 300 series stainlesssteel.

PumpsSolution and refrigerant arecirculated by means of threehermetic, single-stage centrifugalpumps. The pump impeller is castiron with a steel shaft supported bytwo tapered carbon bearings. Thebearings are lubricated and themotor is cooled by the fluid that ispumped. An adjustable frequencydrive is provided on the generatorpump and absorber pump toprovide solution control.

Automatic Purge SystemThe purge system utilizes an eductorfor moving non-condensables to thecondenser, Purifier™ purge to collectthe non-condensables in an externalstorage tank, and vacuum pump forremoval of the non-condensables.The purge operates automatically toremove non-condensables from theunit during periods of chilleroperation and shutdown. Logging ofpurge information is provided viathe unit control panel.

GeneratorThe shell is carbon steel. Tubesheets are steel and standardgenerator tubes are constructed ofcupro-nickel. The generator hasfixed and floating tube supports toallow for even tube expansion. Thesteam side of the generator isdesigned and stamped for 50-PSIASME construction. Generator/condenser includes rupture disk,which is sized to meetANSI/ASHRAE B 15.

Lithium Bromide Filter The filter system consists of thefilter assembly and the associatedpiping and filter isolation valvesneeded for operation andmaintenance. The main filter body isstainless steel with a replaceableelement. The filter isolation valvesallow service of the filter assemblywithout disturbing operation of therest of the machine.

Machine DescriptionThe following chapter containsmachine identification of majorcomponents and warning andcaution label locations. The itemsidentified are referenced throughoutthis manual in each applicablesection.

Figure 1 illustrates the majorcomponents of a typical ABSDAbsorption Chiller.

Figure 2 identifies control panellabels, tags and warning or cautionsthat pertain to unit identification,installation and operation.

GeneralInformation

ABS-M-10A-E4 5

Component Identification and Location

A typical Horizon ABSD steam machine is illustrated in Figure 1. Major components are identified in a front, back,right-end, and left-end view. Figure 2 illustrates the machine labels location.

Figure 1 – Typical 500 Two-Stage Steam Machine

GeneralInformation

Rupture Disk2" [51 mm]

PurifierPurge

Generator/Condenser

Solution Pump Adjustable Frequency Drive

Evaporator/Absorber

VacuumPump

Nameplate

Vacuum ValveRefrigerantStorage Tank

RefrigerantSolution Pump

AbsorberSolution Pump

1-7/8" [48 mm]Anchor Holes

Unit ControlPanel

Front

Back

Energy Valve withActuator Motor

ABS-M-10A-E46

Figure 1 (Continued) – Typical 500 Two-Stage Steam Machine

GeneralInformation

TowConnectionHole

Left End Right End

TowConnection

Hole

Tow Connection Hole

1

2

3

4

Figure Notes:1 = Condenser2 = Generator3 = Evaporator4 = Absorber

ABS-M-10A-E4 7

Machine Panel LabelingThe unit control panel ships with thelabeling indicated in Figure 2. Thevarious labels are identified as wellas the ship with literature pieces.

Figure 2 – Machine Labels Location

Legend1. C.E. Compliance Label2. ETL Listing Label3. Nameplate Label4. Customer Notes5. Nameplate (Horizon)6. Voltage Warning Label7. Field Wiring Connection Diagram8. Flat 9" x 12" [229 x 305 mm]

Plastic Bag *9. Operation and Maintenance

Manual10. Installation Manual11. Poly Clear Envelope12. Plastic SH Antistatic Foam13. Lift/Move/Level Label14. Inspect/Damage Label15. Customer ID Tag16. Customer Marked Package Tag17. AFD Drive Manuals

*Contains installation andoperation/maintenance, AFD drivemanuals and includes as-builtschematic wiring diagram prints(laminated).

Note: UCP panel “keys” ship in anenvelope taped behind the controlpanel.

GeneralInformation

PrintPocket

Ship ToAddress

Packing List

ABS-M-10A-E48

NameplateThe ABSD unit nameplate is locatedon the chiller control panel. Thenameplate illustrated is an ABSD800 ton, Single -Stage SteamAbsorption.

Note: For temperature, pressuredrops, and water flow data see theorder write-up.

The Unit Nameplate contains veryimportant service information suchas the unit serial number, salesorder number and the service modelnumber. Always have thisinformation readily available whenrequesting service.

Trane Horizon Absorption SeriesSingle-Stage Absorption Liquid Chiller

Catalog Model NumberABSD800

Service Model NumberABSD080GF0KXXXXXANXXAVAMBEEBGAHDCAXXXXAXAXXXX0

Sales Order Number Unit Serial NumberAXB123 L00D12345M

Maximum Inlet Steam Pressure: 14 PSIG

Electrical CharacteristicsRated Voltage: 460 Volt 60 HZ 3 PHVoltage Utilization Range: 414-506 VACRated Current: 39.0 AmpsMinimum Circuit Ampacity: 47.0 AmpsMax Overcurrent Protective Device: 50.0 AmpsPurge Compressor RLA: 4.8 AmpsControl Circuit: 115 VAC 2000VA

Motors KW FLAPurge Pump: .19 4.4Refrigerant Pump: 3.7 2.0Absorber Solution Pump: 5.6 15.0Low Temp Solution Pump: 3.7 12.0

Service LiteratureInstallation Manual ABS-IN-10AOperation/Maintenance. Manual ABS-M-10A

Manufactured Under the Following U.S. Patents:4223539, Other Patents Pending

This advanced model ABSD HORIZON Single-StageAbsorption Unit was developed with the assistance of the

Gas Research Institute.

Product Description:

MODL ABSD DSEQ FO NTON 800VOLT 460 BURN NSEL BOPA NSELFTAA NSEL SMHC NSEL ENSR STMENPR 50 PVCN STD PURG AUTOLGTM SB04 HGTM NSEL CDTM SB09EVTM ES12 ABTM SB00 GNWA GN02CAWA CA17 EVWA EV01 CAWC REREEVWC LEFR CAFT WTR EVFT WTREVLV BF03 EVIN FACT EVPN SSTLUPNT SFPT WCNM SNMP SPKG DAUELPP SELP PPCO NFDS LCLD CLDOWVUO YES OPTM YES AFDS YES

GeneralInformation

Nameplate

ABS-M-10A-E4 9

Service Model NumberSingle Stage AbsorptionStandard Options Only

Service Modeldigit / variable Description Selection

1 - 4 Absorption Unit ModelABSD Single Stage Absorption

5 - 7 Unit Nominal Tonnage050 500 Nominal Tons060 600 Nominal Tons070 700 Nominal Tons080 800 Nominal Tons097 975 Nominal Tons110 1100 Nominal Tons122 1225 Nominal Tons135 1350 Nominal Tons

8 Unit VoltageA 190 Volt - 50 HZB 200 Volt - 60 HZC 220 Volt - 50 HZD 230 Volt - 60 HZE 380 Volt - 50 HZF 415 Volt - 50 HZG 460 Volt - 60 HZH 575 Volt - 60 HZ

9 Unit Energy SourceJ Steam Energy SourceG Hot Water Energy Source

10 Design Sequence

11 Design Sequence

12 Generator Waterbox Design PressureK Steam - 50 PSIG ASME RequiredM Hot Water - 150 PSIG ASME RequiredN Hot Water - 400 PSIG ASME RequiredE Pressure Vessel Construction

Standard construction (includes ASME generator)

13 X Not Applicable

14 X Not Applicable

15 X Not Applicable

16 X Not Applicable

17 X Not Applicable

18 - 19 Low-Temperature Generator TubesAN .028 Wall 90-10 Cupro-Nickel Smooth SurfaceAP .035 Wall 90-10 Cupro-Nickel Smooth SurfaceAR .049 Wall 90-10 Cupro-Nickel Smooth SurfaceBD .028 wall 409 Stainless Steel Smooth Surface

20 X Not Applicable

21 X Not Applicable

GeneralInformation

ABS-M-10A-E410


22 - 23 Condenser TubesAV .028 Wall Copper Smooth SurfaceAW .035 Wall Copper Smooth SurfaceAN .028 Wall 90-10 Cupro-Nickel Smooth SurfaceAP .035 Wall 90-10 Cupro-Nickel Smooth SurfaceAR .049 Wall 90-10 Cupro-Nickel Smooth SurfaceBF .028w 316L Stainless Steel Smooth Surface

24 - 25 Evaporator TubesAM .025 Wall Copper Enhanced SurfaceAL .025 Wall 90-10 Cupro-Nickel Enhanced SurfaceAE .035 Wall 90-10 Cupro-Nickel Enhanced Surface

26 - 27 Absorber TubesBE .022 Wall 95-5 Cupro-Nickel Smooth SurfaceAK .028 Wall 95-5 Cupro-Nickel Smooth SurfaceAL .035 Wall 95-5 Cupro-Nickel Smooth SurfaceAM .049 Wall 95-5 Cupro-Nickel Smooth SurfaceAN .028 Wall 90-10 Cupro-Nickel Smooth SurfaceAP .035 Wall 90-10 Cupro-Nickel Smooth SurfaceAR .049 Wall 90-10 Cupro-Nickel Smooth SurfaceBF .028 Wall 316L Stainless Steel Smooth SurfaceAV .028 Wall Copper Smooth Surface

28 Pressure Vessel ConstructionE Standard construction (ASME Generator)

29 Generator Water Box ArrangementB 1-Pass Non-Marine Right Front FlangeC 2-Pass Non-Marine Right Front Flange

30 Condenser and Absorber Water Box ArrangementG 150 PSI Marine VictaulicH 150 PSI Marine Right Front FlangeJ 150 PSI Non-Marine VictaulicK 150 PSI Non-Marine Right Front Flange

31 Evaporator Water Box ArrangementC 1-Pass 150 PSI Non-Marine VictaulicD 1-Pass 150 PSI Non-Marine Right Front FlangeA 2-Pass 150 PSI Non-Marine VictaulicB 2-Pass 150 PSI Non-Marine Right Front Flange

32 Unit Energy ValveG 2-Way 3" [76 mm] 150 pound Wafer ButterflyH 2-Way 4" [102 mm] 150 pound Wafer ButterflyJ 2-Way 6" [152 mm] 150 pound Wafer ButterflyK 2-Way 8" [203 mm] 150 pound Wafer ButterflyL 3-Way 3" [76 mm] 150 pound Flanged tee Wafer ButterflyM 3-Way 4" [102 mm] 150 pound Flanged tee Wafer ButterflyN 3-Way 6" [152 mm] 150 pound Flanged tee Wafer ButterflyP 3-Way 3" [76 mm] 300 pound Flanged tee Wafer ButterflyR 3-Way 4" [102 mm] 300 pound Flanged tee Wafer ButterflyT 3-Way 6" [152 mm] 300 pound Flanged tee Wafer ButterflyU 2-Way 3" [76 mm] 150 pound Flanged ButterflyV 2-Way 4" [102 mm] 150 pound Flanged ButterflyW 2-Way 6" [152 mm] 150 pound Flanged ButterflyY 2-Way 8" [203 mm] 150 pound Flanged ButterflyA 2-Way 2" [51 mm] 150 pound Wafer V-Bal

GeneralInformation

ABS-M-10A-E4 11


B 2-Way 3" [76 mm] 150 pound Wafer V-BallC 2-Way 4"" [102 mm] 150 pound Wafer V-BallD 2-Way 2" [51 mm] 300 pound Wafer V-BallE 2-Way 3" [76 mm] 300 pound Wafer V-BallF 2-Way 4"" [102 mm] 300 pound Wafer V-BallZ 2-Way 2" [51 mm] 150 pound Flanged V-Ball1 2-Way 3" [76 mm] 150 pound Flanged V-Ball2 2-Way 4" [102 mm] 150 pound Flanged V-Ball

33 Electrical Protection PackageD Standard Electrical Package

34 Control Panel Power ConnectionA Circuit BreakerB Fused Disconnect SwitchC Non-Fused Disconnect SwitchD Terminal Block

35 Local Clear Language DisplayA Clear Language Display - Complex CharacterB Clear Language Display - Suitable for Outdoor Use

36 X Not Applicable

37 Tracer Interface Control ModuleA Tracer 100 Interface Module (com3)B Tracer Summit Interface Module (com4)

38 Printer Interface Control ModuleA Printer Interface Module

39 Ambient Chilled Water ResetA Ambient Chilled Water Reset

40 Under/over Phase Voltage ProtectionA Under/over Voltage Protection

41 Chiller/tower Water Flow DisplayA Differential Water Pressure Transducers

42 Options Control ModuleA Options Module

43 X Not Applicable

44 Unit InsulationC Cold Unit Insulation Only

45 Lithium Bromide FilterA Lithium Bromide Filter

46 Unit Special FeaturesX Not ApplicableS Special

47 X Not Applicable

48 Purge System1 Automatic Purge System2 Manual Purge System

49 Adjustable frequency drive1 Frequency Drive

GeneralInformation

ABS-M-10A-E412

WWAARRNNIINNGG

CCAAUUTTIIOONN

Warnings and cautions appear atappropriate intervals throughoutthis manual. Warnings are providedto alert installing contractors topotential hazards that could result inpersonal injury or death. Cautionsare used to alert personnel toconditions that may result in minoror moderate injury or equipmentdamage.

IMPORTANTOperation without proper waterpump and flow sensing interlockingwill void unit warranty.

Note: This machine uses lithiumbromide inhibited with lithiummolybdate and lithium hydroxide.Lithium bromide that contains otherinhibitors cannot be used in thisequipment.

To avoid risk of injury never climbover a machine or step oncomponents. Always use a platform,ladder or similar.

To avoid risk of injury always use acrane or hoist to lift or movemachine components.

Lift locations are marked.

Safety Precautions

WWAARRNNIINNGG

HAZARDOUS VOLTAGE!

DISCONNECT ALL ELECTRICPOWER INCLUDING REMOTEDISCONNECTS BEFORE SERVICING.

FAILURE TO DISCONNECT POWERBEFORE SERVICING CAN CAUSESEVERE PERSONAL INJURY ORDEATH.

WWAARRNNIINNGG

HAZARDOUS VOLTAGE!

DO NOT USE WATER ON A MOTOROR ELECTRICAL FIRE. USE CO2

(CARBON DIOXIDE) OR ANSAL (DRYCHEMICAL) (CLASS ABC OR BC).

USE OF WATER ON AN ELECTRICALFIRE MAY RESULT IN SERIOUSPERSONAL INJURY OR DEATHCAUSED BY ELECTRICAL SHOCK.

CCAAUUTTIIOONN

ELECTRICAL COMPONENTS!

KEEP PAINT AWAY FROM ALLELECTRICAL COMPONENTS ANDNEVER PAINT WHILE THE MACHINEIS ENERGIZED.

FUMES MAY BE PRESENT CAUSINGEXPLOSIVE CONDITIONS.

CCAAUUTTIIOONN

LITHIUM BROMIDE!

LITHIUM BROMIDE IS NORMALLYNONTOXIC; HOWEVER, OTHERCHEMICALS MIXED WITH THESOLUTION CAN CAUSE IRRITATIONAND ADDITIVE VAPORS CANCAUSE NAUSEA. ALWAYS PROVIDEVENTILATION TO REMOVEACCUMULATED VAPORS.

IN CASE OF ACCIDENTAL CONTACTWITH THE SOLUTION, WASH THEAFFECTED AREA WITH WATERIMMEDIATELY.

CCAAUUTTIIOONN

SOLUTION VAPOR ANDCONDENSATE PIPES!

SOLUTION VAPOR ANDCONDENSATE PIPES CONNECTEDTO THE GENERATOR SECTIONS OFTHE MACHINE HAVE SURFACETEMPERATURES AS HIGH AS 300°F[149°C].

AVOID CONTACT WITH THESEAREAS WHILE THE MACHINE IS INSERVICE TO PREVENT PERSONALINJURY IN THE FORM OF SEVEREBURNS.

GeneralInformation

ABS-M-10A-E4 13

To understand the Horizon chilleroperation, a thoroughunderstanding of the variousaspects of the machine are required.This section of the manual,therefore, explains the lithiumbromide cycle, the controls utilizedto control the lithium bromide cycle,and the sequence of operation of thecycle and associated controls.

Machine Solution Cycle

The machine solution cycle isdiscussed in this section. Refer tothe cooling cycle schematic, Figure3, during the cycle explanation andreference Table 1.

Sequence ofOperation

Figure 3 – Single-Stage Absorption Refrigeration Cycle

Table 1 – Machine Cooling Cycle (Reference Figure 3) (Typical Temperatures)Concentration Temperature Temperature

Point LiBr Solution or Refrigerant Water % (°F) (°C)1 Absorber Dilute Solution 60.8 107 422 Absorber Dilute Solution Entering the Low Temperature Generator 60.8 185 853 Solution Leaving the Low Temperature Generator 64.4 216 1024 Solution Entering Absorber Sump/Spray Pump 64.4 129 545 Absorber Spray Solution (Mixed with absorber dilute) 63.1 121 496 Low Temperature Generator Refrigerant Vapor NA 208 987 Condensed Refrigerant NA 110 438 Evaporator Pump Refrigerant NA 41 59 System Chilled Water/Entering NA 54 1210 System Chilled Water/Leaving NA 44 711 Absorber Cooling Water NA 85 2912 Absorber Leaving/Condenser Entering Cooling Water NA 94 3413 Condenser Leaving Cooling Water NA 101.6 38.614a Steam Entering Unit @12 psig @ Sea Level NA 244 11814b Hot Water Entering Unit @270°F [132°C] (option) NA 270 13215a Condensate Leaving Generator NA 244 11815b Hot Water Leaving Generator (option) NA 222 106

Steam

Generator

PurifierPurge

Condenser

Evaporator

Absorber

Eductor

Generator Pump

EvaporatorSpray PumpCooling

Water

RefrigerantStorage

ChilledWater

SolutionHeatExchanger

14

15

13

6

12

11

10

9

8

7

54

3

2

1

ABS-M-10A-E414

Refrigerant Cycle(Reference Figure 3)

Refrigeration CycleThis is an example of typicalmachine operation at a standardrating point condition (that is, 85°F[29°C] tower, 44°F [6.7°C] leavingchilled water) at full load. Dilutesolution has a relatively highrefrigerant content and low lithiumbromide content. An intermediatesolution is a mixture of dilute andconcentrated solutions. Aconcentrated solution is one with arelatively low refrigerant contentand high lithium bromide content.

Generator Dilute solution (1) is pumped intothe generator (2) where it is boiledby the steam or hot water in thetube bundle, creating refrigerantvapor. The refrigerant vapor isdrawn to the condenser (6). The nowconcentrated solution flows bygravity through the solution heatexchanger (3) to the absorber (4)spray system where it is mixed withdilute solution (1) from the absorberand sprayed on the absorber tubes(5).

Condenser Refrigerant vapor (produced by thelow temperature generator) entersthe condenser (6) to be reduced inpressure/temperature via expansiondevice for delivery to the evaporator.The heat of condensation is rejectedto the cooling water inside the tubebundle (12-13).

Evaporator System water runs through the tubebundle (9-10) where its heat istransferred to the sprayedrefrigerant water (8) causing therefrigerant to vaporize/boil. Therefrigerant vapor is drawn to theslightly lower pressure in theabsorber.

Absorber Refrigerant vapor is absorbed by thelithium bromide solution (dilute) tobe circulated and cycled again. Thesolution is pumped through thesolution heat exchanger to thegenerator. Absorber Heat (acquiredin the evaporator) is rejected via thecooling water inside the tube bundle(11-12).

Absorption Process Solution (concentrated) enters thespray system from the generatorand enters the spray system wettingthe tubes and providing a liquidsurface for the refrigerant vaporfrom the evaporator to absorb intothe lithium bromide solution. Thesolution temperature/concentrationsprayed in the absorber controls theabsorber pressure therebycontrolling the evaporatorrefrigerant temperature.

Solution Heat Exchanger Solution flows through the heatexchanger being preheated reducingthe heat energy required to induceboiling within the generator and todecreasing the temperature of thesolution being returned to theabsorber, thus decreasing the loadon the cooling tower.


ABS-M-10A-E4 15

Control Panel Location andInternal Hardware

Component DescriptionThe main control panel (Figure 4)has two sections. The left side(control side) includes clearlanguage display (mounted throughdoor), chiller, circuit, purge, stepper,and optional communicationsmodules, a terminal block, and a 115Vac-control voltage to 24 Vactransformer. The right side (powerside) consists of a main line voltageterminal block or disconnect servicefor line power connections, linevoltage to control voltagetransformer, relays, transformers,starter module and purge module.Line voltage is restricted to the right-hand side.

Figure 4 – Machine Control Panel

The components within the controlpanel are illustrated in Figure 5.Modules are stacked and locatedtop, bottom or middle configuration.

Voltages in Panels

Voltages present within the unitcontrol panel include:

• Three phase line voltage (powerside only)

• 115 Vac control circuits

• 24 Vac module power supply

Low voltage, low power (30 Vdc orless – Class II) circuit connectionpoints are located on the left side ofmodules. High voltage, high power(greater than 30 Vdc – Class I) circuitconnection points are located on theright side of modules. All 115 Vaccircuits are Class 1.

The stepper drive uses less than 30Vdc however, the output signals areClass 1 due to its output current(amps).

Class 1 and Class 2 wiring must notbe routed together withoutshielding.


Control Side Power Side

ABS-M-10A-E416

Figure 5 – Panel Layout


Panel Layout Legend1U1 - Starter Module1U2 - Circuit Module1U3 - Chiller Module1U4 - Purge Module1U5 - Stepper Module1U7 - Options Module*1U8 - Tracer Communication Module*1T1-2-3 - Phase Current Transformer1T4 - Line Voltage Transformer1T5 - Control Voltage Transformer1T6-7-8 - Under-Over Phase Voltage Transformers*L1-2-3 - Main Power Entrance1TB2 - Pump Motor Terminal Block1TB3 - UCP2 Control Panel Mounted Terminal Strip1S1 - Line Voltage Fused Disconnect Switch*1K1 - Refrigerant Pump Abnormal Relay1K6 - Purge Relay1K11 - Refrigerant Pump Contactor1U11 - Refrigerant Pump Overload1F1, F2 - Line Voltage Transformer Fuses1F3 - Phase Voltage Transformer Fuse*1F4, F5, F6 - Refrigerant Pump and Absorber Solution Pump Motor Fuses1F7, F8, F9 - Low Temperature Solution Pump Motor Fuses*Optional

ABS-M-10A-E4 17

Signal Block DiagramThe following signal block diagramillustrates the interrelationship ofthe interprocessor communications(IPC) link that allows the variousmodule microprocessors tocommunicate. All control modulesare mounted in the chiller controlpanel. The option andcommunication modules are presentonly when specified. The TraneTracer Automation System providescommunications outside the unitcontrol panel.

The Chiller Module (1U3) serves asthe master control. This module isresponsible for implementing thealgorithms that control chilleroperation. It manages the functionsof machine safety, operating limits,chilled water temperature control bymonitoring unit mounted sensorsand information from other moduleson the interprocessorcommunications (IPC) link.

The chiller module initiates andcontrols all data communications.Internal control algorithms andexternal input data are used toproduce chilled water temperaturewhile maintaining safe reliablechiller operation. The input/outputports on the chiller module monitorand control-chilled water andcooling water pump operation. Theevaporator and condenser waterpumps are electrically controlledand interlocked to the unit controlpanel. This interlocking arrangementprovides protection from impropersystem water pump control or lossof flow conditions, which candamage the machine.

This module communicates throughthe interprocessor communicationsconnection to other modules suchas: the stepper drive module tocontrol the energy input, the startermodule to start/stop the solutionpumps and control solution flow,and to the operator interface todisplay machine status informationto the operator.

Set point Communication andStorageThe machine setup informationselected at the operator interface isstored in the chiller modules non-volatile memory that is retainedwhen the panel is not powered. Thechiller module is responsible forverifying that the setup memory isnot corrupted, and for substitutingdefault settings if the stored settingsbecome corrupted.

1U1 Starter Module The starter module controls externalwater pump operation and providesan interface to an adjustablefrequency variable speed drive forsolution pump control.

1U2-Circuit Module The circuit module is located in thelower portion of the control sectionbeneath the starter module. Themain purpose of the circuit moduleis that of an input/output (I/O)expander for the chiller module. Thecircuit module provides input datafrom unit temperature sensors, unitpressure and switch inputs, andmakes this information available byway of an interprocessorcommunication link. This moduleprovides output contact closures forcontrol of the purge and lithiumbromide concentration sensing,detection, and recovery control.


Figure 6

To Other Tracer orOther BAS

To Other UCMsICS Proprietary

Comm3

Unit Proprietary

Tracer (Optional)

TCI IV(optional) Purge

Module

IPC

OptionsModule

(Optional)

StepperModule

StarterModule

CircuitModule

ChillerModule

Local CLD

Unit Control Panel with Modules

ABS-M-10A-E418

1U4 Purge ModuleThe purge module providesautomatic purge pumpout logic. Asensor located on the purgecondensing unit suction line ismonitored to determine whenpumpout is required. An output thenturns on the pumpout cycle. Thepumpout period duration ismonitored and stored for analysis.

1U5 Stepper Module Stepper module 1U5 collects inputfrom unit sensors and binary inputdevices. The stepper output is usedfor control of the energy valve.

1U6 Local Clear Language Display(LCLD, or Operator Interface)(standard)The LCLD is located on the controlside door. The module connectingwiring is accessible on the doorbackside. This module acceptsoperator keypad input andcommunicates with the other controlelements within the control panel.See operator interface for completedetails.

1U7 Options Module (optional)Present only when optional featuresare specified that required additionalinput or outputs (I/O).

1U8 Tracer CommunicationsInterface Module (optional)Required for Tracercommunications.

Terminal BlocksTerminal blocks are used for variousconnection points within the controlpanel as identified below.• 1TB1 Main terminal block

(standard).• 1TB2 Pump Motor Terminal Block –

Line voltage distribution point forthe three phase motors.

• 1TB3 Control Panel MountedTerminal Strip-Providestermination points for internalwiring, and for field wiringinterface points. See the electricalconnection’s points on the typicalunit schematics.

Main Power Termination PointThe connection point in the powersection used for customer threephase power.• 1TB1 Main terminal block

(standard).• 1S1 Line voltage non-fused

disconnect switch-optional.• Circuit breaker, or shunt trip circuit

breaker - optional.

Circuit Breakers and Fuses Circuit breakers and fuses thatprovide the branch circuitprotection.• 1CB2 Line voltage transformer

circuit breaker. • Circuit breaker provides branch

circuit protection to 1T5 primarywinding.

• 1F1, 1F2 Line voltage transformerfuses.

• 1F3 Phase voltage transformerfuse.

• 1F4 ,1F5, 1F6 Refrigerant andabsorber solution pump motorfuses.

• 1F7, 1F8, 1F9 Low temperaturesolution pump motor fuses.

RelaysThe following relays are used toisolate 115 volt signals from lowvoltage module input signals.• 1K1 - Refrigerant pump abnormal

relay• 1K6 - Vacuum pump relay


ABS-M-10A-E4 19

TransformersTransformers are used to reducevoltage to required levels. Some areused to distribute power and othersfor module input signals. Thevarious transformers are identifiedbelow.

1T1, 1T2, 1T3 Phase CurrentTransformersCurrent transformers are used tosense the total 3 phase line currentdraw. The output of each currenttransformer is input to the 1U1starter module. Currenttransformers are polarity sensitive.Typically there is a marking ”dot” onone side and the secondary wiresare black and white. The installationof the transformers must be with themarkings all facing the samedirection regarding the current flowthrough the primary wiring. Thecurrent transformer outputs areinput to the starter module anddisplayed at the LCLD with in thePurge/Pump Report.

1T4 Line Voltage TransformerTransformer that steps down linevoltage to 115 Vac control poweredcircuits.

1T5 - Control Voltage Transformer Transformer that steps down the 115Vac control voltage to 24 Vac power.1T6, 1T7, 1T8 Under-Over PhaseVoltage Transformer (Optional)Voltage potential transformersprovide an isolated secondaryvoltage that is a proportionalrepresentation of the primaryvoltage. Each line voltage of thethree phase supply to the unitcontrol panel is sensed. Eachpotential transformer’s low voltageoutput is input to the 1U5 startermodule.

Control System Features andFunctions• Operator interface with a 40

character, 2-line display and a 16key keypad.

• The microprocessor automaticallydilutes the lithium bromidesolution, before shutting down themachine.

• Chilled water pump control outputcontacts.

• Absorber/Condenser pump controloutput contacts.

• Automatic and manual control ofsolution and refrigerant pumps.

• Adjustable frequency drive forsolution flow control of the lowtemp solution pump and absorberspray pump.

• Automatic and manual purgesystem incorporating the TranePurifier Purge™.

• Dilution control Refrigerant DumpValve provides refrigerant whereit’s needed to properly reducesolution concentration during adilution cycle or loss of power.

• If an extended loss of poweroccurred while running, a dilutioncycle will be initiated when thepower is restored. This dilutioncycle will attempt to reduce thesolution concentration to preventcrystallization.

Additional System Protection:• Under/over voltage detection

(optional)• Chilled water flow confirmation

input • Condenser water flow confirmation

input • Emergency stop shutdown input


ABS-M-10A-E420

Control Locations

Machine controls are factory mounted and wired. External controls are connected with field wiring, and arecontrolled by the chiller or used by the chiller system.

Figure 7 – Machine Sensor Locations


4R2 FAR SIDE

UNIT ENERGYVALVE

4R2 NEAR SIDE

RIGHT ENDOF UNIT

ABS-M-10A-E4 21

Table 2Name Sensor Application Type4R2 Supply Steam Pressure Transducer Transducer4R3 Generator Steam Pressure Transducer4RT1 Sensing Detection and Recovery Temperature Sensor4RT6 Evaporator Entering Water Temperature Sensor4RT7 Evaporator Leaving Water Temperature Sensor4RT8 Absorber Leaving Water Temperature Sensor4RT9 Condenser Leaving Water Temperature Sensor4RT10 Absorber Entering Water Temperature Sensor4RT12 Saturated Evaporator Refrigerant Sensor Thermistor4RT13 Absorber Spray Temperature Sensor4RT14 Solution Temperature Leaving Absorber Sensor4RT15 Solution Temperature Entering Absorber Sensor4RT16 Solution Temperature Entering Low Temperature Generator Sensor4RT18 Solution Temperature Leaving Low Temperature Generator Sensor4RT19 Saturated Condenser Refrigerant Temperature Sensor4RT22 Hot Water Temperature Entering Low Temperature Generator Sensor 4RT23 Steam Condensate or Hot Water Temperature Leaving Low Temperature Generator Sensor


Left End

Left End

Right EndRight End

4B1 Refrigerant Pump

4B2 AbsorberSolution Pump

4B3 LowTemperatureSolution Pump

Low TemperatureHeat Exchanger

Low TemperatureHeat Exchanger 4B3 Low Temperature Solution

Pump Motor

4B2 AbsorberSolution PumpMotor

4B1 RefrigerantPump Motor

ABS-M-10A-E422

Machine Control

This section identifies sequence ofoperation and control strategy,machine control panel details andspecific machine mounted controls.

The illustration represents time andevent proceeding from left to right.The operator interface displays, timeand the events in the sequence thatthey occur. Follow the sequence tounderstand when external andinternal control devices are used.The time line provides informationthat may not be obvious whenwatching the display. Additionally,this information can be used fortrouble shooting purposes.

The sequence of operationillustrates time and events thatoccur at initial power-up, duringstart-up when auto is selected, autooff cycle operation, or manual stopoperation. The time line 1 and 2 inFigure 8 and time line 3 (Figure 8continued) pictorially illustrates theevents that occur during normaloperation.

Sequence of Operation Time LineReferenced Notes

1. See “Operator Guide” for a listingof valid modes that may occurduring “Unit is Running.”

2. Upon power up, refrigerantdilution valve 1 (4B6) remains offfor thirty seconds.

3. When a “need to cool” exists, anincomplete dilution cycle can beexited by pressing the Auto key.The chiller will continue with anew start-up sequence.

4. The “Auto, waiting for a need tocool” can be exited by pressingStop.

5. Power loss at this point will resultin a dilution cycle upon re-establishing power, if there is noneed to cool.

6. Power loss at this point will resultin the remainder of a dilutioncycle being completed upon re-establishing power.

7. Chilled water pump will bestopped after the dilution cycle iscompleted for all MAR and MMRexcept in the case of chilled waterpump flow overdue where thechilled water pump signalremains on.

8. Panic stop; operator presses thestop key twice within 5 seconds.This state may be exited bypressing either the stop or autokey.

Machine Start-upDuring the machine start sequencethe chiller relies on external devicesto provide correct feedbackspecifically, the chilled water pumpstarter and flow switch confirmation,condenser water pump starter andflow switch confirmation. Duringmachine start-up, the appropriatemessage will be displayed thatconfirm the sequences occurred.

The Unit Control Panel (UCP) waitsup to four minutes and fifteenseconds for proof of chilled waterflow after a water pump startcommand output is given.

Failure to receive chilled water flowwithin the allotted time confirmationresults in a message stating“Diagnostics -auto.” This is aMachine shutdown Auto Restart(MAR)- diagnostic where the chillerwill start once the chilled water flowswitch logic is satisfied.

Failure to receive condenser waterflow within the time periods’ resultsin an Machine shutdown ManualRestart (MMR)- diagnostic where thechiller must be reset beforecontinued operation is allowed.

Dilution CycleA 3 to 15 minute dilution cycle isperformed on all shutdown modeswith one exception. The exception isa “Panic Stop” that consists of anoperator depressing the stop keytwice (or continuously) within a 5-second period. This will execute apump stop command and all pumpswill stop without the normal dilutioncycle. A restart can be initiated atanytime by pressing the auto key. Adilution cycle may be entered bypressing the stop key. If “Stop” isselected, the events following a stopcommand is pictorially illustrated inthe bottom half of Figure 8(continued).


ABS-M-10A-E4 23

Figure 8 – Sequence of Events from a Stop or Auto Condition through Start


Standard ModeDisplay:

Stop AutoStarting Absorber/Condenser

Pumps

Wait for Chilled WaterFlow, If flow notestablished in less than4 minutes and 15seconds then issue:Chilled Wtr Flow notEst. MAR Variable 6 secto 4 min,15 sec

Wait for aCall forCooling (See Note4)

Variable

Wait for CondenserWater Flows, if flownot established inless than 4 minutesand 15 seconds thenissue: Cond. WtrFlow not Est. MMRVariable 6 sec. to 4 min. 15 sec.

TimeLine 1START

Go toTimeLine 2(Below)

Events:

Chilled Water Pump Off

Condenser Water Pump Off

Solution Pumps OffAbsorber and RefrigerantPumps OffEnergy Valve Closed

All other Diagnostics areactive

RDV1 Closed

AUTO Selected

Chilled Water Pump Started

TimeLine 1a

Point of Re-Entry if the OperatorHits AUTO from Dilution Cycle

orReset from Diagnostic Auto

orWaiting for Differential to Start(System in AUTO Mode)

ChilledWater FlowEstablished

Differential to Start isReached (Cooling Required)

Condenser Water PumpStarted

Low Temperature SolutionPump Started (AFD atMinimum Speed)

Hot Water MachinesHot Water Pump On

StandardModeDisplay:

Time Line 2

Go to TimeLine 3 (NextPage)

Start FillingGenerator

Start - Preheating Solution(See Note 5)

Unit is Running(See Notes 1 and 5)

30Seconds

Indicates Time Line (1,2 or 3) Location

Waiting to EstablishConcentration of 54% LiBr - Var. Based on Concentration

Hold for 3minutes toStabilizeSystem

Command EnergyValve 40% of allowablerange and begin Pre-Heat with Absorber andRefrigerant Pumps Off

RefrigerantPump StartedAbsorber Pump Started

Modulate Low Temperature SolutionPumps AFD to satisfy Leaving WaterTemperatureModulate energy Valve to SatisfyLTHX Crystallization Margin

Events:

ABS-M-10A-E424


Figure 8 (Continued) – Sequence of Events: From Running through Dilution Cycle

Standard ModeDisplay:

Unit isRunning

(See Note 1and 5)

DilutionCycle

(See Note 6)

Local or RemoteStop

Time Line 3

Go to Time LineSTART (Previouspage)

Chilled Water Pump off delay (See Note 7)

Unit was running for anindeterminate amount oftime

15second

PostPurge

(Note 2)

Dilution Timer (See Note 3) Auto

Stop ChilledWater Pump

Go to Time Line 1a(Previous page)

Auto

StopStop

All Stop Modes

All Running Modes

Blank Reset (Hard)

Stop Selected or AUTO Differential toStop Occurs (Cooling Satisfied)Open RDV1 to Dilute SolutionStop Refrigerant PumpStop Condenser Water PumpEnergy Valve OffCommand Low Temperature SolutionPump AFD to 75% of Allowable SpeedRangeMonitor Strong Solution TemperatureLeaving Generator, if <200°F [93 mm]then 3 minute dilution cycle. If >200°F[93 mm] then 15 minute dilution cycle.

Completes Dilution Cycle After Satisfying Load

Stop Low Temperature Solution Pump

Stop Absorber PumpHot Water Pump Stop

Panic Stop Selected

Operator Hits Stop Twicewithin 5 Seconds

The Auto/Stop switch is setto Stop. Unit will Enter aDilution Cycle.The Unit Will Not Startunless the Auto key ispressed.

This state mayonly be exited bypressing Stop orAuto keys Operator presses Stop

Operator presses Auto

Standard Mode Display:

1 Second

Chilled Water Pump OffCondenser Water Pump OffSolution Pumps OffRefrigerant Pump OffAbsorber Pump OffEnergy Valve Closed

All Other diagnostics areActiveRDV1 Open

Loss of power and Re-establishment of Power

Events: Power OffDuringAUTO orDilutionCycle

Power OnIf in AUTO ModeGo to Time Line 1a

ABS-M-10A-E4 25

Machine Control Strategy

The objective of the unit controlsystem is to reliably achieve andmaintain leaving chilled water Setpoint. The unit control panel (UCP)monitors chilled water temperatureand its relation to the panel setpoint, and adjusts the amount ofsolution supplied to the generator,and the energy applied as needed.Adjusting the solution flowmaintains the leaving watertemperature. Adjusting the energyinput maintains solutionconcentration. These twoadjustments are the two primarycontrol algorithms employed in theUCP. Reference Figure 9.

1. Leaving Water Temperature (LWT)The unit control panel comparesleaving chilled water temperature tothe leaving water set point andadjusts the refrigerant vaporpressure in the evaporator toachieve control. The refrigerantvapor pressure is determined by theabsorber spray concentration. Theabsorber spray concentration ischanged by adjusting the generatorsolution flow with the adjustablefrequency drive (AFD) control of theabsorber spray and low temperaturesolution pumps.

Absorber spray solutionconcentration determines theabsorber vapor pressure thatcontrols the refrigerant vaporpressure and temperature. Therefrigerant. spray temperature thencontrols the LWT to the leavingwater temperature Set point.

2. Concentration ControlSolution concentration controladjusts the generator energy inputto hold solution concentration tooptimum efficiency. The strongsolution concentration is typicallymaintained 15°F [-9.4°C] fromtheoretical crystallization point. Thisis called the low temperature heatexchanger (LTHX) temperaturemargin. As strong solutionconcentration is varied by LWTsolution flow control, the theoreticalcrystallization temperature ischanged. The control system adjuststhe energy input to maintain theLTHX temperature marginthroughout the load range. Thesimplified control illustration belowillustrates the two control inputs andindicates that these inputs mustpass through the “limit control”before the signals are output thesolution pump AFD and/or energyinput control.

Along with the microprocessorcontrol of LWT and concentrationcontrol as stated previously, themicroprocessor monitors operatingconditions that could alter machineoperation. If such a condition isdetected the limit control systemwill override LWT and concentrationcontrol requests. The override limitoccurs when a control output (fromLWT or concentration control)request is greater than allowed bythe particular limit schedule. Thelimit control modifies machinecontrol to continue operation.

When a limit or safety takes prioritycontrol, the clear language displaywill so indicate the active limitmode. A limit mode does notnecessarily mean that a problemexists. In many cases this limit is anormal function such as soft loadduring start-up.


Figure 9 – Simplified Diagram of LWT Control and Concentration Control

1) LWT Input

2) ConcentrationInput

Control System

LWT PID

Concentration PID

Limit Control

AFD Control

EnergyControl

ABS-M-10A-E426

The microprocessor will shut downthe chiller if a safety set point isviolated.

Figure 10 illustrates the limits thatcan override LWT and concentrationcontrol. The primary control signalcan be modified by any limit.

Soft Loading Soft loading is accomplished via afiltered Set point change function inthat it affects the speed that themachine loads or unloads whengiven a new set point target. Thisoccurs at start-up and whenever thechilled water Set point is changed.On start-up, this allows the machineto warm-up gradually, and allowsfor the tower water to warm-up. Softloading is also active when a chilledwater Set point change is received.The new Set point will be reached asthe new target Set point at the endof the set soft loading time period.The soft loading time period isfactory set to 15 minutes and can beset from 1 to 100 by the start-uppersonnel.

Low Condensing Temperature Limit Low temperature may limit solutionflow to prevent salt carryover and/orcrystallization. The factory defaultsetting is designed to providereliable chiller operation with lowtower temperatures. To do this thesolution flow may need to be limitedat condensing temperatures belowdesign. The further below designand the higher the load will increasethe likelihood of this limit modebecoming active.

Low Refrigerant Temperature Limitand CutoutThis limit prevents the machinefrom driving down the refrigeranttemperature below safe and reliabletemperatures. If an unsafe level isapproached the control strategy willfirst limit loading, then enter a holdwhere continued loading is notallowed. If the refrigeranttemperature continues to fall, theunit will unload in an attempt tokeep the chiller on line avoiding alow temperature trip.

If the refrigerant temperaturecontinues to decrease and thecutout is reached then an MMR willoccur requiring manual reset. Forexample, with a typical lowrefrigerant temperature set point of36°F [2.2°C] the following will beactive points; limit loading will beginwith a decreasing refrigeranttemperature reaching 38.5°F [3.6°C],hold loading will occur @ 38°F[3.3°C], and unload will occur at37.5°F [3.1°C]. Cutout will occur @36°F [2.2°C] resulting in a machineshutdown manual reset- MMR-diagnostic. The factory defaultsetting is 36°F [2.2°C] and can beadjusted, if required by Traneservice personnel.

Low Chilled Water TemperatureLimitLow chilled water temperature limitoperates similarly to the lowrefrigerant temperature limitpreviously discussed. For example,with a typical low chilled watertemperature Set point of 38°F[3.3°C], limited loading begins @40.5°F [4.7°C], hold loading @ 40°F[4.4°C], unload at 39.5°F [4.2°C], andtrip @ 38°F [3.3°C] resulting in amachine shutdown manual reset-MMR- diagnostic. The factorydefault setting is 38°F [3.3°C] andcan be adjusted, if required by Traneservice personnel. The minimumdifference between these limits is2°F or 1°C.


Figure 10 – Limit Conditions that could Override LWT and Concentration Control

LeavingWater

TemperatureSignal

ConcentrationSignal

Control and Limits

SoftLoading

SDRLoading

LowCondenser

TemperatureLimit

EvaporatorLimit

AFDControl

EnergyControl

ABS-M-10A-E4 27

Sensing Detection and Recovery(SDR)Solution flow sensing provides theinput information for proper solutionflow detection. This is a back upsystem providing a second line ofdefense if concentration control failsto maintain the set margin ofdegrees away from thecrystallization point. If an incorrectflow pattern is detected the controlsystem enters a recovery mode ofoperation that cycles the solutionpumps and refrigerant dump valveto dilute the strong solution,reestablishing the correct flowpattern. The control system will, onthe first and second occurrence,increase the set concentrationmargin by 5°F [-15°C] in an attemptto prevent a reoccurrence, and aninformational warning message willbe displayed on the clear languagedisplay. Upon the third occurrence amachine shutdown manual reset(MMR) diagnostic will be set andrequire manual reset after correctiveaction is established.

Steam Input Flow ControlSteady steam input flow isimportant to maintain stableconcentration control. The controlrate at which steam enters the unitis a function of: A) supply pressure,B) saturation pressure in thegenerator, and, C) the steam valveposition. With steady steam supplypressure the flow can be controlledquite well with the valve positionalone. However, in cases wherebuilding steam supply pressurevariations do occur various flowrates would occur. The controlsystem would sense this via theabsorption fluid pressures andtemperature, and then makeadjustments as necessary.

Today’s Steam Input Flow Controlincorporated in our ABSD and ABTFchillers utilizes steam pressuretransducers to measure thepressures to the valve and at themachine. This information is thenutilized to calculate steam flow todetermine the proper valve positionduring these undesired pressurechanges. The energy valve has astepper control motor with 16,300

steps of resolution providing veryprecise valve position control. Theflow control algorithm and the finitecontrol of the stepper motor providethe best possible steam inputcontrol.

Adjustable Frequency Drive (AFD) The low temperature solution pumpand absorber spray pump flow rateare controlled by adjusting theoperational speed of the pumps.This is done by the AFD’s. The mainunit control panel outputs an analogsignal to the AFD’s that drive thesolution pumps at the desired speedto provide the correct amount ofsolution flow for the machine loadcondition. This section discusses theAFD.

AFD Description: An adjustable frequency AC drive isa device for controlling the speed ofan AC motor by changing thefrequency of the power supplied tothe motor. The adjustable frequencydrive is a solid-state powerconversion unit that receives 3phase, 60 Hz input power, converts itto DC power, filters it, and theninverts it to provide motor powerthat is modulated to the frequencydesired. The AC drive also regulatesthe output voltage in proportion tothe frequency to provide anominally constant ratio of voltageto frequency as required by thecharacteristics of the AC motor.

AFD Operation within theAbsorption SystemThe output from the AFD's providespower for the Absorber (4B2) andLow Temp Solution (4B3) pumps.

Operating FrequencyFigure 11 illustrates the solutionrange of frequencies used for typicalpump motor control, 25 Hzminimum to 54 Hz maximum. Theminimum and maximum stopvalues, used in this example, are thefrequency utilized range. The endpoints will change by machine sizeand are factory selected. The endstop locations, indicated in Figure11, illustrate the difference betweenavailable and actual frequencies thatcould be used during a factorycalibration of the controls.

See operator guide for AFD Keypadillustration and flow chart of menuitem.


Figure 11 – Pump Motor Supply Frequency

Solution Flow Adjustable Frequency Drive Control

FixedMinimum 25 Hz

FixedMaximum 60 Hz

Decrease IncreaseAFD Pump Speed

*Adjustable Minimum Stop(Typically 25-30)

*Adjustable Maximum Stop(Typically 48-60)

*Setting established and programmed at machine start-up.

ABS-M-10A-E428

Purge System Operation

The machine is factory leak checkedto high standards. Hermetic integrityis the focus of this design sincestability of the unit vacuum isrequired to maintain chillerefficiency and reliability. Consistentmaintenance practice will ensurethat the factory established hermeticintegrity is maintained. Non-condensables that accumulate in themachine must be removed bypurging.

Absorber Removal of Non-CondensablesAbsorber removal of non-condensables from theabsorber/evaporator shell isaccomplished via the pickup tubesand the eductor. Depending on thechiller configuration, the purgepickup tubes will be through acollection chamber or drop downtubes. Refer to Figures 12 and 13 tosee the differences.

The eductor uses the solution beingpumped by the Low TemperatureSolution Pump (LTSP) to remove thenon-condensables from thechamber and pickup tubes. Thedischarge of the eductor is to thesuction side of the LTSP where thenon-condensable are transported tothe Low Temperature Generator(LTG). The dilute solution pumpedthrough the LTSP carries the non-condensable to the LTG section. Inthe LTG the non-condensable arereleased from solution and migrateto the lower pressure of thecondenser. From the condenser, thePurifier Purge removes the non-condensable by creating even alower pressure in the purge tank.Any non-condensable from the hightemperature generator are passed tothe condenser through a vent line.The Purifier Purge pumpout cycleinitiates and terminates per thesuction temperature of thecompressor. The lower temperaturecreates a lower pressure to drawnon-condensables from thecondenser into the purge collectiontank.

Timed PumpoutThe purge system will initiate a“timed pumpout” cycle periodically,as determined by the timedpumpout settings within the ServiceSettings field start-up menu. Thispumpout will pump out of theabsorber via the lower motorizedvalve. Usage depends on machinecharacteristics and load conditions.

Automatic Purifier™ Purge Operation Automatic purge operation occurswith the absorption machine “on”.The normal mode of operation iswith the purge set to “On” on thecontrol panel clear language display.With “On” purge operation, thepurge condensing unit operatesduring chiller operation, andvacuum pump runs continuously.The condensing unit draws non-condensables out of the condenserto a non-condensable collectiontank.

The purge senses when thecollection tank contains non-condensables via suctiontemperature and executes thepumpout cycle as necessary. Apumpout valve opens to allow thevacuum pump to expel thecollection tank of non-condensables.Pumpout time is monitored andstored for analysis.

If the purge suction temperaturedrops below the 30°F [-1.1°C] inhibitlevel, the purge system will go into a“standby” mode.

Automatic operation of the purgesystem when the chiller is in the offposition is slightly different. Onlythe vacuum pump operates and themotorized valve(s) open and closebased on the purge pumpout timeand duration interval defined in theField Start-up menu.


Figure 12 – Purge tubes and collectionchamber (early design)

Figure 13 – Purge drop tubes (used onlater chillers)

Figure 14 – Eductor Position

Absorber

Eductor

LTSP

ABS-M-10A-E4 29

Purge Components

Purifier Purge OperationThe purifier purge is active when thepurge-condensing unit is powered.The evaporator coil of thecondensing unit is used to condenserefrigerant vapor in the purgecollection tank. This results in aslightly lower pressure in the purgecollection tank thus, drawingrefrigerant vapor and non-condensables into the purgecollection tank. Refrigerant vaporand non-condensables enter thepurge tank through a pickup lineconnected at the bottom of thepurge tank.

Once inside the tank, the refrigerantvapor condenses on the purge tankcoil and falls to the bottom of thetank, leaving non-condensables toaccumulate. Liquid refrigerantreturns to the condenser throughthe return line. The pickup andreturn lines have isolation valvesthat can be closed when tank serviceis required.


Purge Operation Modes

Within Operator settings, purge operation can be selected as: Off, On, or Service/Pumpout.

Table 3 identifies the modes and the status of the major components in each mode.

Table 3 – Modes and Status of Major Components in Each ModePurge Operating Mode Chiller Operating Mode Condensing Unit Vacuum Pump Pumpout Valve (s)

Off On/Off Off Off Closed/OffOn On On On Pumpout By TemperatureOn On On On Pumpout by timed interval (absorber valve, if installedOn Off Off On Pumpout by timed interval (condenser tank valve only)

Service Pumpout NA On On Open/OnNote: Normally, purge should be in the “on” mode position.

Figure 15 – Purifier Purge Components

Legend for Figure 15:1. Pumpout Valve2. From Absorber Valve3. Electric connection4. Tygon Hose5. Solenoid Valve6. Vacuum Pump Motor

7. V-Belt Guard8. Compressor9. Condenser Unit

10, Return line Isolation Valve11. Tank Pickup Line and Isolation Valve12. Vacuum Pump

ABS-M-10A-E430

Purifier Purge OperatingCycle

Figure 16 illustrates the cycle of theactive purge.

As non-condensables accumulate inthe purge tank (1) the availablecondensing surface in the tankbecomes limited, and thecondensing unit compressor suctiontemperature (2) will begin to fall.When the condensing unitcompressor suction temperaturedrops to the pumpout temperature,a sensor signals the purge moduleand a pumpout cycle begins. Non-condensables in the purge tank arethen evacuated with a vacuumpump. As the non-condensables areremoved from the purge tank, thecondensing unit compressor suctiontemperature increases. Thiscondensing temperature is againsensed at the purge module that willterminate the pumpout cycle whenthis temperature rises sufficiently.The pumpout suction temperaturevaries in relationship to the unitscondensing temperature. Thisallows purge operation withcondensing temperatures from 50°Fto 180°F [10°C to 82°C].


Figure 16 – Purifier Purge Refrigerant Circuit

1

2

34

6

5 7

Legend for Figure 16:1. Purge Tank (with Spiral Evaporator Coil2. Temperature Sensor3. Compressor4. Condenser5. Purge Tank (Gaseous Refrigerant from Chiller Condenser)6. Expansion Device (Suction Pressure Regulating Type)7. Purge Tank Outlet (Liquid Refrigerant Returned to Chiller Condenser)

ABS-M-10A-E4 31

Using the Control Panel

This section provides detail of theoperator interface display,operation, keypad key functions,display group menus-report andsettings, and how to use thesefunctions.

Operator Interface (LocalClear Language Display –LCLD)

The operator interface (LCLD)provides a method to communicatewith the chiller. The operator selectsinformation to be displayed fromeight group keys that havepredetermined menus. All operatorselections and monitoredinformation are entered and/ordisplayed from this device. Theoperator interface obtains theselected setup values and data fromthe interprocessor communications(IPC) link. The settings andtemperatures will not be displayeduntil they have been read by way ofthe IPC. Displayed items, such astemperature, will be updated everytwo seconds. Service mode menusprovide machine setup, servicetests, and manual control operation.

DisplayFigure 17 illustrates the operatorinterface that features a two-line,forty-character display, an alarmindicator (LED), and a keypad for theselection of specific formatted chillerinformation menus. The display hasbacklighting for legibility in low lightconditions. This backlight is alsoused to maintain the operatingtemperature of the display. Duringlow ambient temperature periodsthe backlight will illuminate. This isdone by the control modulecontrolling the backlight current,based on the equipment roomambient temperature.

MenusThe display includes all operationstatus, reports, settings, service, anddiagnostic messages. Details ofthese menus are discussed later inthis section

Alarm LED

1. The single red LED located to theright of the display will BLINKwhenever a machine manual reset(MMR) diagnostic exists andmanual machine reset is requiredto restore operation.

2. The alarm LED will illuminatecontinuously when a service testitem is placed into manual modeoperation. The LED serves as areminder that something remainsin manual mode.

Normal machine operation does notrequire manual mode operation ofany service tests (passwordprotected) items.

OperatorGuide

Figure 17– Operator Interface

Unit Is Running

CustomReport

ChillerReport

CycleReport

Pump/PurgeReport

OperatorSettings

ServiceSettings

ServiceTests

Diagnostics

Previous Enter Auto

Next Cancel Stop

Alarm

ABS-M-10A-E432

Operator Interface (LCLD)Operation

KeypadFigure 17 illustrates the operatorinterface keypad. The keypad is asealed membrane type with 16 keysarranged 4 by 4. The keys areseparated into three fields:

1. Report keys are located across thetop row and are used for viewingof preformatted informationmenus.

2. The second row of keys aresetting’s group menus.

3. Functional keys are located acrossthe bottom two rows and are usedto input changes.

The functional keys are discussednext since the operation determineshow the user communicates withthe report and setting’s menus.

Functional KeysThe Next and Previous keys causethe display to step through thevarious menus within a group. Thereport group will sequence aroundto the top or bottom of the groupwhen the end or beginning isreached, respectively. The (+) and (-)keys cause the setting beingdisplayed to increase or decrease,respectively. If the (+) or (-) key isheld down for more than 1/2 secondit will increment or decrement thesetting continuously at 10 countsper second, until the key is released.(Settings do not wrap around whenthe end of range is reached.) Oncethe (+) or (-) key has been pressed toselect a particular setting, the Enterkey or Cancel key must be pressed.(The Next or Previous keys will notadvance until Enter or Cancel ispressed.) A Setting is not changeduntil the Enter key is pressed. TheCancel key is pressed if a changedsetting should not be saved. Whenthe Enter key is pressed the displaywill blank out momentarily toindicate to the operator that thekeystroke was recognized.

If the boundaries of a specificselection are exceeded the operatorinterface will display out of rangeand will not allow that selection tobe entered.

When Auto is pressed the chiller willenter an auto mode of operation.When Stop is pressed the chiller willstop, entering the “Unit is Preparingto Shutdown” mode.

During the five-second period amessage indicating the optionalemergency stop command will bedisplayed. The Stop key is located inthe lower right hand corner.

IMPORTANT

If the Stop key is pressed a secondtime within five seconds animmediate “Panic Stop” will beexecuted, overriding the normal“Unit is Preparing to Shutdown”mode.

To restart the dilution cycle, pressthe Stop key. To reenter auto modepress Auto. If the leaving watertemperature does not exceed thedifferential, to start the dilution cycleis entered for the duration of thetimer, and “Auto waiting need tocool” will be displayed along withdilution cycle time remaining. If theleaving water temperature is greaterthan differential to start, then therestart auto sequence will occur.

When the Auto or Stop key ispressed the display will go to thefirst display of the Chiller Reportindicating the current operatingmode.

OperatorGuide

ABS-M-10A-E4 33

Using Group Menus

1. Select one of the group keyslabeled Chiller, Cycle, or Purge-Pump since these groups containpreformatted report menus. Thiswill bring up the respectiveheader display. Pressing CustomReport will bring up its headerdisplay however; there may notbe any items within this group atthis time. Pressing OperatorSettings, Service Settings, ServiceTests, or Diagnostics will bring upits header display. See theoperator interface overview for alisting of display headers and themenu items.

2. Press the Next key to advance, orpress the Previous key to backup,while scrolling through thedisplays within each group menu.(To quickly go to the last menuitem press the Previous key at thedisplay header.)

To Create the Custom Report:

1. Go to one of the Report Groups(Chiller, Cycle, Pump/Purge) andselect the desired menu item toadd to the Custom Report.

2. Press the (+) key. The item is nowentered into the Custom Reportgroup.

3. To add another repeat step 1 and2.

4. Up to twenty items can be enteredinto the Custom Report group.When there are twenty items inthe report no more can be addeduntil one is removed.

5. To remove an item from theCustom Report, press the (-) key,while it is displayed.

To Change Settings

1. Press the appropriate settingsgroup key.

2. Press the Next key at the headerdisplay.

3. Enter password if required.

4. Use the Next/Previous key tobring up the item to be changed.

5. When the item to be changed ison the display press the (+)(-) tobring up the new value.

6. Press Enter to enter the newvalue. Press Cancel to keep theprevious value.

To Reset the Chiller

1. Press the Diagnostics group key.

2. The Diagnostics display headerwill be shown. Press the Next key.

3. Enter password if required.

4. View all active diagnosticsdisplayed. Investigate and correctthe problem that caused the shutdown, before proceeding torestart the chiller.

5. To reset the chiller press Nextuntil the diagnostics clearingdisplay stating “Press (Enter) toclear all diagnostics and resetsystem” is displayed. Press Enter.When the diagnostic is cleared thechiller will return to theoperational mode that wasinterrupted by the diagnostic. Thechiller must not be reset until thediagnostic condition is addressed,and corrected. If required, contactthe local Trane service agency forassistance.

6. Chiller may restart if in “auto”and differential to start issatisfied. Press stop to preventstarting, if desired.

To Change Set point

1. Press Operator Settings key.

2. Using the Next key, advance to“Front Panel Chilled Wtr Setpt.”

3. Using the +/- keys, change the Setpoint as desired. Press Enter.

PurgingThe purge operation mode isnormally set to “on“ mode.

While in on, purging will occurduring machine auto and stopmodes of operation. To check or setto on:

1. Press Operator Settings key.

2. Press Next to advance to “PurgeOperating Mode” display.

3. Use +/- keys to toggle betweenmodes. Select On. Press Enter.

For manual on purging seemaintenance section.

Operator Interface (LCLD)Overview

The following is a listing ofpreformatted menu informationcontained in the operator interface,including options.

Menu items are listed in sequenceand in columns under each groupkey. See Fogire 18 through Figure23.

OperatorGuide

ABS-M-10A-E434

Figure 18 – Custom Report, Chiller Report, Cycle Report

OperatorGuide

User Defined Custom Report

Press Next or Previous toContinue

Chiller StatusWater Temps & Setpts

Press (Next) (Previous) to Continue

Operational Mode Line 1Operational Mode Line 2

Chilled-Water Setpt (Source)xxx.x f/c

Evap Leaving Water Temperaturexxx.x f/c

(source) CWS: xxx.x f/c

(settings source) CWS: xxx.x f/c

Evap Entering Water Temp:xxx.x f/c

Evap Leaving Water Temp:xxx.x f/c

Absorber Entering Water Temp:xxx.x f/c

Absorber Leaving Water Temp:xxx.x f/c

Cond Leaving Water Temp:xxx.x f/c


Approx. Evaporator Water Flow:xxxxx gpm/lpm

Approx. Absorber/Cond Water Flow:xxxxx gpm/lpm

Approximate Chiller Capacity:xxx Tons

Press (Next) or (Previous) to Continue

Outdoor Air Temp: xxx.x f/cPress (Next) (Previous) to Continue

Cycle ReportPress (Next) (Previous) to Continue

Solution Temp Leaving Absorber:xxx.x F/C

Solution Temp entering GEN:xxx.x F/C

Solution Temp Ent Absorber:xxx.x F/C

Absorber Spray Temp::xxx.x F/C

Supply Steam Pressure:xxx.x psig/kpa

Generator Steam Press:xxx.x psig/kpa

SDR Temp: xxx.x F/C

Trip Temperature: xxx.x F/C

Solution Temp Leaving LTG:xxx.x F/C

Saturated Cond Rfgt Temp:xxx.x F/C

Absorber Ent Concentration:xxx.xx% LiBr

LiBr Crystallization Filtered Margin:xxx.x f/c

Saturated Evap Rfgt Temp:xxx.x F/C

Evap Leaving Water Temp:xxx.x F/C

Evap Entering Water Temp:xxx.x F/C

Absorber Entering Water Temp:xxx.x F/C

Absorber Leaving Water Temp:xxx.x F/C

Condenser Leaving Water Temp:xxx.x F/C

Soln Pump AFD Auto Speed Cmd:xxx.x

Press (Next)(Previous) to Continue

AND

Energy Input Auto Cmd: xxx.x


Custom Report

Chiller Report

Cycle Report

If no Items are Selected forcustom Report see OperationManual to Select Entries

OR

OR

OR

OR

Steam Condensate Temp Leaving:xxx.x F/C


Generator Entrg Hot Wtr Temp:xxx.x F/C

Generator Lvg Hot Water Temp:xxx.x F/C

Energy Input Auto Cmd: xxx.x

(Limit Mode)

Energy Input Manual Cmd: xxx.x


Energy Input Manual Cmd: xxx.x

Limited Manual Cmd: xxx.x

Energy Valve Position: xxx


ABS-M-10A-E4 35

OperatorGuide

Figure 19 – Purge Pump Report

Pump/Purge Hours, Starts &AmpsPress (Next) (Previous) toContinue

Purge/PumpReport

Purge Operating Mode: (Mode)

Purge Status: (Status)

Purge Refrigerant Suction Temp: xxx.x F/CPress (Next) (Previous) toContinue

Purge Pumpout Rate:xxx.x Min/24 Hrs

Purge Max Pumpout Rate:xxx.x Min/24 Hrs

Purge Total Pumpout Time:xx,xxx.x Min

Purge Total Run Time:xx,xxx.x Hrs

Service Log, Pumpout Time:xx,xxx.x Min

Service Log, Time Since Reset:xxx Days

30 Day Purge Pumpout Avg:xxx.x Min

Chiller Average Run Time:xxx.x Hr/Day

Total Motor Phase Currents:% RLA

A xxxx% B xxxx% C xxxx%

Motor Phase Currents - Amps

A xxxx Amps B xxxx AmpsC xxxx Amps

Motor Voltages

AB xxxx Volts BC xxxx VoltsCA xxxx Volts

Chiller Starts: xxxx

Accumulated Run Time:HRS: MIN:SEC

If Below Allowable Purge Oper. range:

Purge refrigerant Suction Temp:xxx.x F/C

Inhibited, Low Cond Temp.

If Above Allowable Purge Oper. range:

Purge refrigerant Suction Temp:xxx.x F/C

Inhibited, High Cond Temp.

ABS-M-10A-E436

OperatorGuide

Figure 20 – Operator Settings

Chilled-Water Setpts & PurgeControl


OperatorSettings

Settings in the Menu are (Status)

(Password Message)

Purge Operating Mode: (Mode)

Press (+) (-) to Change Settings

Current Time/Date HH:MM xmMon,

xx xxxx(Enter) to Change: (Next) toContinue

Current Time/Date HH:MM xm Mon

xx, xxxxTo Change Hour, Press (+) (-) &(Enter)

Front Panel Chilled-Water Setpt:xxx.x F/C

Press (+) (-) to Change Setting

(Default) Chilled-Water SetpointSource:

(Source)

Chilled-Water Reset Type:(type)


(Type) Reset Ratio: xxx%


(Type) Start Reset Setpoint: xxx.x F


(Type) Max Reset Setpoint: xxx.x F


Chilled-Water Flow Pretest (status)

Press (+) (-) to Continue

Setpoint Source Override:

(Source)

Press (Enter) to Print Report

Press (+) (-) to Continue


xx, xxxxTo Change Minute, Press (+) (-) &(Enter)


xx, xxxxTo Change Month, Press (+) (-) &(Enter)


xx, xxxxTo Change Day, Press (+) (-) &(Enter)


xx, xxxxTo Change Year, Press (+) (-) &(Enter)

Enter

Next

ABS-M-10A-E4 37

OperatorGuide

Figure 21 – Service Settings

ServiceSettings

Service Settings: BASIC SETUPS


If Keypad lock passwordfeature disabled

If menu settings passwordfeatured disabled

If keypad lock passwordfeature enabled

Press (Enter) to Lock Display &Keypad

Password will be required to unlock

**Display & Keypad are Locked**

***Enter Password to Unlock***

(PRESS PREVIOUS & ENTER)

Ifpressenter

Upon entering password goes to chillermode display (exits service setting)

Next

“Chiller Operating Mode”If menu settingspassword featureenabled

(Unlocked)

Settings in this Menu are (Unlocked)

Press (Enter) to Lock

Settings in this Menu are (Locked)

Enter password to unlock(- +- +- +)

If pressentered

If enterpasswordNext

Next

(If Locked)

Language: xxxxxxxx


Display Units: (Type)


Decimal Places Displayed: (Status)


Display Menu Headings: (d/e)


Press (Enter) to

Clear the Custom Report Menu

Custom Menu has been Cleared

Enter

Press (Enter) to

Reset Purge Service Log

Purge Service Log has beenReset

Print time interval: xxx HoursPress (+) (-) to Change Setting

Printer Setups(Enter) to Change, (Next) toContinued

Print on Time Interval: (Status)Press (+) (-) to Change Setting

* Note: Service level passwordsecured, press (next) (previous) tocontinue.

Evap Pump Off Delay: xxx min


Differential to Stop Setpoint:xxx.x f/c


Differential to Start Setpoint:xxx.x f/c


Next

“Pswd Reqd to Access Field Start-Up Group”

Please Enter Password*

Next

Enter

Next

Next

Press (Enter) To Access field start-Up Group

“Pswd Reqd to AccessMachineConfig Group”

Please Enter Password*

Press (Enter) To Access MachineConfiguration Group

ABS-M-10A-E438

OperatorGuide

Figure 22 – Service Tests

Service Tests

Password required to access servicetools group

Please enter password (+ + - - + +) andpress enter

Service tests and overrides

Press (Next) (Previous) to continue

Chilled-Water Pump: (Auto or On)

Press (+) or (-) to change setting

Chilled water flow switch status:

Flow switch is open/no flow or flow switch is closed/flow

Absorber/condenser water pump (Auto or On)

(Message)

Absorber/condenser water flow switch status:

Flow switch is open/no flow or flow switch is closed/flow

LTG Solution pump control: (XXX)


Absorber pump control: (Auto, Off, On)


Refrigerant pump control: (Auto, Off, On)


Solution pump AFD speed control:(Auto of Manual)


Differential Water PressureSensing Options (if installed)

Abs/Cond differential wtr press: xx.x psid/kPaPress (Next) (Previous) to continue

Differential Water PressureSensing Options (if installed)

Evap differential wtr press: xxx.x psid/kPaPress (Next) (Previous) to continue

* Note: When in the manual mode,the “Alarm” LED illuminates toindicate that the manual modehas been selected.

* Normal operation does not require use ofService Tests (password access only).Service Tests should only be performedby knowledgeable personnel if tests arerequired.

Next

Enter

Next

Next

Next

Next

Next

Soln pump AFD (status) speed Cmd: xxx

(Message)

Service Test Continued

Energy input control: (status)

Press (+) (-) to change setting

Energy input (Status) Cmd: xxx

(Message)

Press enter to display software

Revision levels or (Next) tocontinue

Chiller (Revision level)Circuit (Revision level)

Starter (Revision level)Options (Revision level)

Stepper (Revision level)

TCI (Revision level)Purge (Revision level)

LCLD (Revision level)RCLD (Revision level)

ABS-M-10A-E4 39

OperatorGuide

Figure 23 – Diagnostics

Diagnostics

Press Diagnositc Key

Diagnostic Occurs

Header Screens

New Diagnostic Screen

Operating Mode at Last Diagnostic

Set of Screens for FirstDiagnostic

Set of Screens for First Historic Diagnostic

Screen(s) to Clear Diagnostics

Up to 20 Sets Total

Up to 20 Sets Total

ABS-M-10A-E440

Operator Interface Detail

This section provides detailed menuinformation.

Report Menus

The Report Keys (top row) allow theoperator to access four reportgroups that are labeled CUSTOM,CHILLER, CYCLE, and PUMP/PURGE.The CUSTOM report is formatted bythe machine operator. The reportgroups (CHILLER, CYCLE, andPURGE/PUMP) have preformattedmenus.

When a report group key is pressedthe menu header is displayed. Theheader display indicates the title ofthe report group and a briefsummary of the reports contained inthe group. This enables a user toquickly review each report header todetermine if the desired informationis in the group. The header alsoserves as the top of the reportindicator.

Custom ReportThe Custom Report containsinformation selected by theoperator. The custom report sectionallows the user to select and displayup to twenty items of their choiceselected from the CHILLER, CYCLE,and/or PUMP/PURGE report groups.The Custom report is the only reportwhere the displayed information isselected by the user.

The custom report can easily beprogrammed by the followingsequence:

Menu Items can be duplicated in thecustom report by pressing the (+)key, when the desired report isbeing displayed from one of theother report menus. The customreport group can contain up totwenty entries. Attempting to enteranother report when the usercustom report is full results in thedisplay indicating “User Report ->Full.” To change or remove reportsin the custom report group, simplypress the (-) key while it is beingdisplayed and the report item isremoved.

The custom report sequence startswith the following header display:

User Defined Report


If no entries are selected and thenext key is pressed the following isdisplayed:

No Items are Selected for CustomReport

See Operators Manual to Select Entries

If entries exist they will be displayedin the order that they were selectedfrom the other report groups.

The Chiller Report, Cycle Report,and Pump/Purge Report groupscontain preformatted informationthat cannot be changed.

Chiller ReportThe Chiller Report contains unitoperating condition information.Status, water temperature, and setpoints.

Chiller Operating Mode: Two lines ofdisplay indicate the ChillerOperating Mode depending uponmachine status, various chilleroperation modes that can bedisplayed is illustrated in the columnto the right. In the case of timingfunctions, line 2 indicates theassociated timer information. Timerfunctions are displayed and informthe operator of expected delayswithin the sequence of operation.

Operating Mode Line 1 and Line 2(Two Lines Describing OperatingConditions)Press (Next) or (Previous) to Continue

Cycle ReportThe CYCLE REPORT is used todisplay machine temperatures andpressures.

Purge/Pump ReportThe PUMP/PURGE REPORT is usedto display run time informationregarding pumps in the machine.

OperatorGuide

CustomReport

ChillerReport

CycleReport

Pump/PurgeReport

CustomReport

ChillerReport

CycleReport

Pump/PurgeReport

CustomReport

ChillerReport

CycleReport

Pump/PurgeReport

CustomReport

ChillerReport

CycleReport

Pump/PurgeReport

ABS-M-10A-E4 41

Table 4 – Chiller Operation Mode DisplaysMachine Condition Displayed Message (First Line/Second Line)Reset ResettingStop Local Stop: Cannot be overridden by any External or Remote DeviceRemote Stop Remote Display Stop: Chiller may be set to Auto by any External or Remote DeviceExternal Unit Stop Remote Run Inhibit from External SourceUnit Remote Stop Remote Run Inhibit from TracerStart InitializingStart Starting is Inhibited by Staggered StartTime Remaining: Minute/SecondStart StartingStart Starting

Waiting for Chilled Water FlowAuto Waiting for Tracer Communications to Establish Operating StatusAuto Auto

Waiting for a Need to CoolStart Starting

Absorber/Condenser Water FlowStart Starting Solution PumpsStart Starting - Pre-heating Solution

Spray Pumps OffStart Starting - Pre-heating Solution

Spray Pumps OnRun: Normal Cooling Only Unit is CoolingRun: Low Cooling Unit is Running: Water Temperature Limit Low Absorber/Condenser Temperature LimitRun: Evap Limit Unit Is Running

Low Evaporator Refrigerant Temperature LimitRun: Crystallization Sensing Solution Recovery Pump OffDetection and Recovery Time Remaining Minute/Second Run: Crystallization Sensing Solution Recovery Pump OnDetection and Recovery Time Remaining Minute/SecondDilution Cycle Dilution Cycle Remaining:

Minute/SecondWaiting for a Need to Cool

Dilution Cycle Dilution Cycle Remaining: Minute/SecondDiagnostic Shutdown Auto

Dilution Cycle Dilution Cycle Remaining: Minute/SecondDiagnostic Shutdown Stop

Dilution Cycle Dilution Cycle Remaining: Minute/SecondLocal Stop

Dilution Cycle Dilution Cycle Remaining: Minute/SecondRemote Stop

Dilution Cycle Dilution Cycle Remaining: Minute/SecondRemove Run Inhibit from External Source

Dilution Cycle Dilution Cycle Remaining: Minute/SecondRemote Run Inhibit from Tracer

Stop: Transitioning to Stop Transitioning to StopPanic Shutdown Panic Shutdown Sequence Complete

Press Auto/Stop to ContinueDiagnostic Shutdown Diagnostic Shutdown Stop

Stop ModeDiagnostic Shutdown Diagnostic Shutdown AutoAuto from Auto Mode

OperatorGuide

ABS-M-10A-E442

Settings Menus

Operator Settings The Settings keys (second row)allow the operator to select fromfour menu groups. Entering a groupallows the operator to select anyitems contained within the group. Asetting’s group starts at a headerdisplay when the selected setting’skey is pressed.

Operator Level PasswordThe operator settings, servicesettings (basic setup), anddiagnostics group menu items canbe secured by an operator levelpassword.

This feature is predetermined andset at the factory. If operatorpassword is desired contact yourlocal Trane service company. On allmachines, this feature is selectedwithin a higher level securityaccessible within the service levelpassword field start-up group.

When this feature is enabled, thedisplay following the header willstate either “Settings in this menuare LOCKED or UNLOCKED.” IfLOCKED, the second line will state“Enter password to unlock.”Operator level password is

(-+-+-+ & Enter). An incorrectpassword will result in the message“access denied.” If UNLOCKED, thesecond line will state “Press (Enter)to lock.” Pressing ENTER will lock allthe settings within the three groups(operator settings, service settings(basic setup), and diagnosticgroups). When locked, menu itemscan be viewed, however, the secondline of the displays will not indicate“Press +/- to change setting” andany attempt to change a setting willcause the second line tomomentarily indicate “setting islocked.” To UNLOCK, sequence backto the screen that states enterpassword to unlock the three groups(operator settings, service settings(basic setup), and the diagnosticsgroups).

When “Service Settings, Field Start-up” selection of this feature isdisabled the previous operatorpassword displays and indicationsof locked or unlocked is bypassedand is not shown.

The Service Settings menu hasthree submenus within it. The first isnon-password protected andconsists of all the settings, featureenables, set points, and so forth.While they are seldom changed by auser, changes in them do notseriously effect the protection orreliability of the chiller.

The other submenus (field start-upand machine configuration) areprotected, each with a separateservice level password. These arefor changing parameters andsettings regarding fieldcommissioning and fundamentalprotection and control of the chillersubsystems (Field Start-up) or forprogramming of the unit controlmodule (UCM) as to how thespecific chiller was built in theFactory (Machine Configuration).

Once properly set, these menusshould never be changed againwithout specific knowledge of theeffects of the changes. In rareinstances, certain field problemsmay be corrected by makingchanges in these protected menusbut certain aspects of chillerreliability may be compromised. Themain reason these are accessible atall is for field commissioning and toallow for the programming ofservice replacement modules.

Service Tests The Service Test menu providesaccess to screens used to changefrom “Auto” mode to Manual mode.Manual mode control overridesspecific auto control functions. Testsand status screens provide a meansto check the operation of someoutput and input devices.

Anytime a manual mode is selectedthe alarm light will remain on.

Normal machine operation does notrequire the use of any service testitems; therefore they remain withina password-protected (+ + - - + +)menu. Manual operation of theseitems will effect chiller operationand will cause unreliable operation,if left in manual mode. It is thereforerecommended that only qualifiedpersonnel use service tests.

Diagnostics MenuThe Diagnostics Menu contains bothactive and historical information.The menu also contains the facilityto clear active diagnostics, historicdiagnostics, and purge diagnosticsas individual groups. To clearlyenunciate the occurrence of adiagnostic, the display willautomatically go to this menu anddisplay certain messages asexplained below.

New Diagnostic Display SequenceWhen a new diagnostic is sensed bythe system, the display will reset tothe diagnostic menu. A “one-time”screen will be displayed to informthe user that a new diagnostic hasbeen detected.

This “one-time” screen will varydepending on the type of diagnosticdetected. The two major categoriesof diagnostics are those which areinformational warning only (IFW),and those which have resulted inmachine shutdown; machineshutdown manual reset required(MMR) and machine shutdown autoreset (MAR).

OperatorGuide

OperatorSettings

ServiceSettings

ServiceTests Diagnostics

OperatorSettings

ServiceSettings


OperatorSettings

ServiceSettings


OperatorSettings

ServiceSettings


ABS-M-10A-E4 43

Adjustable Frequency Drive (AFD)KeypadFigure 24 illustrates the AFD keypad.Machine operation does not requireusing this keypad. The AFD willnormally operate in “auto” mode.Only in the case of abnormalcondition for reset, or by servicepersonnel, will this keypad requireusage.

CCAAUUTTIIOONN

The AFD is factory programmed foruse in this application. Do notattempt to reprogram anyparameter as this may jeopardizemachine operation and reliability.

OperatorGuide

Figure 24 – AFD Keypad Overview (Model JVOP-130P Illustrated)

Operation Mode indicators:DRIVE: Lit when in operation mode.FWD: Lit when there is a forward run

command input.REV: Lit when there is a reverse run

command input.SEQ: Lit when the run command from the

control circuit terminal or serialcommunication is enabled.

REF: Lit when the frequency reference fromcontrol circuit terminals FV or FI, orserial communication is enabled.

Display (LCD)Displays set value of each function ormonitoring values such as output frequencyand current (2 line x 16 characteralphanumeric).

Enter KeyDisplays the current value of each parameterand allows new values to be entered.

Increase/Decrease KeysChanges set values or parameter numbers.

: Increment key: Decrement key

<

<

Operation Command KeysOperation command keys operate the inverter.STOP/RESET: Red LED lights after depressingSTOP key. Inverter operation is stopped. (resetsoperation after faults; reset is disabled whilerun command is ON)RUN: Red LED lights after depressing RUN key.Inverter operation begins.

Operation Mode Selection KeyAlternate between REMOTE and LOCAL (digitaloperator) operation.Display Key

Scrolls through displaymonitors and Quick-Startparameters, and allows accessto all parameters.

ABS-M-10A-E444

Pressing the “DSPL” key advancesthe Digital Operator through theMenus illustrated in Figure 25.

Figure 25 – LED Description

OperatorGuide

Description Key Sequence Digital Operator Display Remarks

Power ON

DSPL

DSPL

DSPL

DSPL

DSPL

DSPL

DSPL

DSPL

DSPL

DSPL

DSPL

DSPL

DSPL

DSPL

DSPL

DSPL

Frequency Ref0.0 Hz

Output Freq0.0 Hz

Output Amps0.0 A

Output Power0.0 kW

Forward/ReverseFor

Monitor U-01Frequency Ref

Accel Time 110.0 Sec

Decel Time 110.0 Sec

Input Voltage230.0 Vac

V/f Selection6-Hz Preset

Terminal FV Gain100%

Terminal FV Bias0%

Motor Rated FLA19.6 A

PID ModeDisabled

Energy Sav SelDisabled

Parameter n0002Oper mode Select

Depress[ENTER] keyto displaydata

Set/read isenabledonly duringstop

Depress[ENTER] keyto display themonitorvalue

Frequency Referencesetting/monitoring

Output Frequencymonitor

Output current monitor

Output Powermonitor

FWD/REV runcommand selection

Monitor selection

Acceleration Time

Deceleration Time

Input Voltage

V/f pattern selection

Frequence referencegain

Frequency referencebias

Motor rated current

PID selection

Energy Saving selection

Parameter number/data

ABS-M-10A-E4 45

Maintenance

This section contains maintenanceinformation for the Steam or HotWater Absorption Chiller.

Daily MaintenanceTo ensure reliable, safe and efficientoperation the following itemsshould be checked daily as routinemaintenance. This will avoidunnoticed problems that could leadto down time, and provides dailydata that can highlight trends,locating potential problems beforethey occur:

1. Record and review operatingdata. Use the operating log foundon the next page and log thepoints suggested.

Familiarization with the daily logtemperatures and other itemsallows the operator to identifywhen a change occurs, possiblyindicating an abnormal condition.Review the daily operating historywith the service personnel asnecessary or at the nextinspection. (Verify temperaturesand pressure gauges foroperation.)

2. Make sure the machine isoperating properly. Cycle themachine on and off periodically tomake sure it starts and stopsproperly. This allows safetydevices to sequence through astart-up to confirm operation.

3. Check the cooling tower forcorrect water treatment, machineinlet temperature and flow, andcheck system chilled water(Evaporator Circuit). Check waterflow pressure drop daily. Cleanstrainers yearly.

The owner should engage theservices of a qualified watertreatment specialist to obtain thetreatment needed to control tubefouling and maintain machineefficiency. Untreated orimproperly treated water willreduce machine efficiency, andmay require extensive tubecleaning or possible tubereplacement, if the chemicalbalance of the water is notcontrolled.

CCAAUUTTIIOONN

Always allow the chiller to completea dilution cycle beforedisconnecting the chiller powersource.

Maintenance

ABS-M-10A-E446

Figure 26

Horizon – Absorption Operating Log

Job Name _______________________________________________ Serial Number _____________________________________

Machine Model Number __________________________________ Date - Month: ___________Week: _____________________

Maintenance

Sunday Monday Tuesday Wednesday Thursday Friday SaturdayItem AM PM AM PM AM PM AM PM AM PM AM PM AM PM

Evaporator PressureIN

OUT

Absorber/Condenser PressureIN

OUT

Accumulated Run Time

Solution Cycle Data Items

SDR Temperature

Solution Leaving Low Temperature Generator

Saturated Condenser Refrigerant Temperature

Absorber Entering Concentration

LiBr Crystallization Margin

Solution Temperature Entering Absorber

Absorber Spray Temperature

Solution Temperature Leaving Absorber

Solution Entering Low Temperature Generator

Saturated Evaporator Refrigerant Temperature

Evaporator Leaving Water Temperature

Evaporator Entering Water Temperature

Absorber Entering Water Temperature

Absorber Leaving Water Temperature

Condenser Leaving Water Temperature

Steam: Supply Pressure

Steam: Generator Pressure

Solution Pump AFD Auto Speed

Energy Input Command

Purge Status

Suction Temperature

Pump Out Rate

Pump Out Time

Time Since Pump Out Time Reset

Chiller Average Run Time

ABS-M-10A-E4 47

Seasonal Maintenance

Cooling Season PreliminaryReminders

The following items should bechecked before seasonal start-up.Contact you local Trane servicerepresentative to perform theservice.

1. Check unit vacuum. Check theactual unit internal vacuum todetermine if purging is required,before the unit can be safelystarted after extendedshutdown. See unit vacuumcheckout. The maximum internalpressure is dependent on themachine temperature. If purgingis required follow purginginstructions (Purge section).

2. Determine the purge pumpcondition. Run the pump andverify performance. Check theultimate pressure performanceand change oil/repair pump ifrequired.

3. Prepare machine for cooling. Fillcondenser, vent air from thecondenser water boxes. Ventingwill remove air from within thepiping and avoid nuisance tripsof the condenser flow switchinput.

4. Check all piping connections forpossible water leakage. Checkabsorber, condenser, evaporatorwater piping. Assure that any offseason work and reassembly iscomplete.

5. Check pressure drop across thechiller evaporator and condensersections. Compare to unit designconditions.

6. Visually inspect electricalsystem. Look for signs of anyalterations performed since thelast operational season, andverify wiring is intact. CleanAFD’s of dust and grime.

7. Confirm the chilled/hot waterpump, cooling water pump andcooling tower is interlocked.Check the field proof ofoperation interlocking wiring forthe chilled/water flow, and forcondenser water flow.

8. Determine electrical condition ofpump motor contactors.

9. Test run the unit. Check machinecontrol sequence.

10. Replace bromide filter.

11. Purge the machine of non-condensibles. Check purge rateafter the machine is started.Keep machine energy ratereduced until purge ratediminishes during unit operation

12. Log unit-operating data. Checktemperatures and pressuresthroughout the fluid cycle. Checkthat LTSP, ASP, and RP Ampdraw and voltages are normaland not excessive.

13. Water treatment It isrecommended that all tubes betested periodically by a qualifiednondestructive tube testingservice. This testing will confirmtube condition and identifypotential problems.

Extended Shutdown

Drain water circuits (evaporator,condenser, and absorber)completely, and blow out all waterfrom tubes and water boxes.

Main power must remain applied tothe unit to allow automatic purging.

Maintenance

ABS-M-10A-E448

Seasonal Start-Up UnitVacuum Check

Start-up after extended shutdownshould not be attempted until theunit vacuum is measured andcompared with Chart 1. Anycombination of temperature andpressure that falls on or below theline of Chart 1 indicates a safecondition. The unit purging isrequired before start-up if themeasured vacuum is above theacceptable limit.

Check unit internal vacuum at theabsorber service valve located onthe side of the absorber shell. Thisvalve is above the liquid level in thechiller.

Maintenance

Chart 1 – Shutdown Machine Vacuum Chart

Maximum Internal Pressurefor Safe Machine Start

CM HgGauge

MM HgGauge

PressureMM Hg

Absolute

20 30 40 50 60 70 80 90 100 120 140[-6.7] [-1/2] [4.4] [10] [15.6][21.1][26.7][32.2] [37.8] [49.9] [60]

Machine Temperature °F [°C]

ABS-M-10A-E4 49

Purging During Extended UnitShutdownDuring periods of extended shutdown, when chiller will not beoperated, the operator can open anadditional hand valve to provide apath for non-condensables betweenthe evaporator/absorber section andthe generator/condenser section.Reclose this manual valve before thechiller is placed into operation.

Purifier Purge Service PumpoutOperation Servicing may require continuouspumping out of non-condensables.In this case, “service pumpout”mode can be used.

To enter Service pumpout modeselect “Service Pumpout - ON” atthe purge screen within theOperators Settings group. Thecondensing unit, vacuum pump, andvalve all turn “on.” Service pumpoutwill run continuously until manuallyselected to another mode. Nominutes will accumulate on thepumpout timer in the servicepumpout mode.

Auxillary Absorber Pumpout -ManualThe absorber is automaticallydepleted of non-condensablesduring chiller operation by theeductor operation, and the absorbermotorized valve. If manual pumpoutis desired, this can be accomplishedby way of the manual hand valveand the temporary connection of anauxiliary vacuum pump. Manualpurging the absorber must only beperformed during machineoperation when the dilute solutionlevel is below the top of theabsorber.

Purge as a Maintenance ToolPurge activity indicates non-condensables within the chiller.Excessive purging activity mayindicate an air leak or unusualinhibitor consumption. An inhibitoranalysis may be required. The 24hour fault timer monitors the totalpumpout time within any 24 hourperiod, and if it exceeds the presettimer setting a fault signal isgenerated to alert the operator thatpurge activity is excessive. Theoperator interface provides accessto this data in the pump/purgereport group.

Note: The pumpout time onlyaccumulates the minutes ofpumpout activity of the automaticpumpout operation. It does notaccumulate the time of pumpout forservice pumpout operation or timedpumpout operation.

Maintenance

ABS-M-10A-E450

Machine Checkout

GeneralTo assure machine reliability, safety,and efficiency, routine maintenanceof the chiller/control system isrequired.

During servicing, always operate thechiller from the unit local controlpanel. Always allow the chiller tocomplete a dilution cycle beforedisconnecting power. See sequenceof operation for dilution cycle detailslocated in the controls section.

CCAAUUTTIIOONN

Always turn electrical powersupply(s) off before undertaking anymaintenance that does not requiremachine operation.

Machine inspections should beperformed periodically. Someinspection is recommended every 3months, whereas others are at 6and/or 12 months.

Inspection FrequencyRecommendations Table 5 illustrates machine relatedinspection items and the appropriatefrequency. Performing themaintenance at the intervalssuggested will provide the basis formachine reliability.

When appropriate, contact yourlocal Trane service representativeand follow component manufacturerrecommendations in all cases, andcheck local codes for any additionalregulations that may be required.

Service FrequencyRecommendationsThese recommendations may varywhen unusual machine roomconditions exist. Lithium bromideanalysis is recommended yearly.The purpose is to determinesolution inhibitor levels and replaceas needed to control solutionquality.

System Chilled Water (Evaporator)Circuit and Water Treatment

It is recommended that the ownerengage the services of a qualifiedwater treatment specialist to maketests and recommend the treatmentnecessary to control anycontaminating material from thewater.

THE TRANE COMPANY ASSUMESNO RESPONSIBILITY FOREQUIPMENT FAILURE RESULTINGFROM UNTREATED ORIMPROPERLY TREATED WATER.

It is further recommended that alltubes be tested periodically by aqualified nondestructive tube testingservice. This testing will confirmtube condition and identify potentialproblems.

Check water flow pressure dropdaily. Clean strainers yearly.

The system water circuit is a closedcircuit and normally will notaccumulate an appreciable amountof sludge or scale. However, ifcleaning should be required, use thesame method outlined for thecooling water circuit.

Maintenance

Table 5 – Machine Inspection RecommendationsMonths

3 6 121) Analyze unit solution to determine inhibitor consumption X2) Check unit control panel Sequence of operation X

Check all wire terminal connections for tightnessCheck AFD’s for cleanliness. Follow the corrective action in Table 12. XAlways keep cover(s) closed on control panel and connection boxes.

3) Check unit safeties setting and function – Contact a Trane service technician. X4) Check purge system: X• Checking belt tension and condition. X• Check purge pump - ultimate pressure. X• Replacement or overhaul purge pump – Contact a Trane service technician. 3 years• Check for leaks, purge valves – Contact a Trane service technician. X• Clean condensing unit coil – Contact a Trane service technician. X X• Check condition of purge vacuum pump oil – Contact a Trane service technician. X X X5) Check volts and amps of solution pumps and refrigerant pump. X6) Clean tubes. X• Brush tubes. X• Check water quality analysis of evaporator water and cooling water. X*• Eddy current tube inspection should be conducted every third year of operation. 3 years7) Solution Pumps: Verify amps, Listen to operation. X*Or as directed.

Machine Inspection Items

For the following Machine Items, refer to the applicable section in this Manual and/or contact a Trane service technician.

ABS-M-10A-E4 51

Condenser and AbsorberTube Care

Internal fouling of the condenserand absorber tubes will seriouslyreduce their ability to transfer heatto the cooling water.

The resulting higher temperatureand pressure have severalundesirable effects.

1. The refrigerant condensingcapability of the condenser isreduced.

2. The absorber saturation pressureis increased because the solutionis not cooled.

3. The higher condenser saturationtemperature may cause theformation of hydrogen gas, whichmust be purged from theabsorber.

NOTE: To insure reliable andefficient machine operation, thecooling water must be properlytreated. The Trane Companyassumes no responsibility forequipment failure resulting fromuntreated or improperly treatedwater.

Cleaning the Tower WaterCircuit

Check water flow pressure dropdaily. Clean strainers yearly or asconditions require.

Water available for coolingfrequently contains minerals thatwill precipitate out on the walls ofthe tower water circuit in the form ofa carbonate scale. Cooling towerscollect foreign material that willdeposit in the tubes and limitmachine efficiency. At a minimum,condenser and absorber tubesshould be brushed after eachcooling season.

To insure maximum efficiency, thecooling water circuit must be keptfree of both sludge and scale. Even avery thin coating of scale will greatlydecrease the heat transfer capacityof the absorber and condenserbundles. The condenser tubesshould be inspected once a year todetermine if mechanical cleaning isrequired and if the water treatmentis effective.

Two methods for cleaning the tubesare:1. Mechanical2. Chemical

The mechanical method is used toremove sludge and loose materialfrom the tubes. Access to the tubesis obtained by removing theabsorber and condenser waterheaders. To loosen the material,work a nylon or brass bristle brushthrough the tubes (a brass brush isrecommended). After the materialhas been loosened, flush the tubeswith clear water.

Scale deposits are best removed bychemical means. The tower watercircuit is constructed of copper, steeland cupro-nickel.

Figure 27 illustrates a typicalchemical-cleaning hookup. Thecleaning hookup is made to pipefittings installed in the absorbersupply and condenser return piping.

All materials used in the externalcirculation system, quantity ofsolution, duration of cleaning periodand any required safety precautionsshould be approved by the companyfurnishing the materials orperforming the cleaning. Table 6lists the liquid volume (ingallons/liters) of the tubes and waterboxes.

Table 6 – Tube and Water Box LiquidVolumes (Gallons/Litres)

Tube and Water Box Volumes (US Gallons/Litres)

Absorber/Unit Size Evaporator Condenser

500 164 / 622 328 / 1241600 189 / 717 375 / 1419700 244 / 923 435 / 1648800 273 / 1032 481 / 1820975 300 / 1137 570 / 2158

1100 325 / 1231 612 / 23171225 350 / 1325 654 / 24761350 375 / 1419 696 / 2635

Maintenance

Figure 27 – Tube Cleaning Arrangements

Shutoff Valves

Circulator Pump

Cleaning Solution

ABS-M-10A-E452

Water Box Cover BoltingRequirements(Refer to Table 7)

To insure gasket sealing, the boltingprocedure of covers must be asfollows:• Use anti-seize compound on all

bolts before installing water boxcovers.

• Insert and snug up the first 6 to 10bolts towards the centerline ofeach cover. Insure the cover is flatagainst the mating surface and thebolts are just more than fingertight.

• Tighten bolts starting from the centerat top and bottom of each cover andworking outwards to the corners.

Table 7 – Bolt Torque RequirementsBolt Size Torque

(Inch) [mm] (Ft. Lbs.) N-M1/4 6 7 9.55/16 8 15 20.03/8 10 40 54.07/16 11 52 70.01/2 13 100 135.05/8 16 160 216.03/4 19 295 400.07/8 22 410 555.01 25.4 550 745.0

Note: General bolt torque’s requirements forgrade 5 zinc-plated course threaded bolts arelisted above.

Cooling TowerTemperature Control

Control

1. Cooling tower water temperaturesmust be maintained at or above65 F for reliable operation. Controlpanel logic circuits allow start-upat temperatures well below thedesign selection temperature andwill protect against unsafeconditions.

2. To avoid oscillatory effects oftower water fluctuations beinginfluenced on the leaving chilledwater temperature entering towerwater temperature control shouldbe kept constant.

Any time tower enteringtemperature is at or below design,the potential for “Low coolingentering water temperature limit”exists. Depending on the chillerload, the actual temperature of thewater will determine the likelihoodto see this limit actively limitingmachine capacity. The further awayfrom design that the watertemperature deviates the morelimiting potential exists. This controlsystem logic feature is built in toassure continued machine operationand machine reliability, and tocontrol the potential for saltcarryover and/or crystallization.

The maximum rate of towertemperature change must be kept toa minimum. Inherent problems withlarger tower water fluctuations are:

• First, the potential to drop theleaving water temperature to thechillers differential to stop Setpoint.

• Second, cause a crystallizationdetection and recovery cycle to beentered (typically lastsapproximately 11 minutes afterwhich the chiller will restart andproceed to reestablish chilledwater temperature control).

• Inefficient operation becauseunable to maintain margin.

A cooling tower bypass or variablespeed fan is recommended forstable control of the chilled watercircuit.

See Figure 28.

Maintenance

Figure 28 – Typical Piping Instrumentation

Expansion Tank

Air Vent ValveAir Vent Valve

ABSMachine

GateValve

Pressure Gauge

Thermometer

Balance Valve

TowerBypass

Cooling Tower

TemperatureController

CondenserWater Pump

Sump

TemperatureControl

Valves forChemical Cleaning

GateValveDrain

Valve

Pressure Relief Valves

Flow Switches By Others

DrainValve

ChilledWaterPump

ABS-M-10A-E4 53

Tube Support LocationsTable 8 identifies the location of the internal tube supports.

Table 8 – Tube Support Locations (Inches) (See next page for millimeters)

Unit Size Bundle 1-2 2-3 3-4 4-5 5-6 6-7 7-8 8-9 9-10 10-11 11-12 12-13 13-14

500 Absorber 42 7/8 42 7/8 42 7/8 42 7/8 na

Evaporator 42 7/8 42 7/8 42 7/8 42 7/8 na

Condenser 42 7/8 42 7/8 42 7/8 42 7/8 na

Generator 21 3/8 21 3/8 21 3/8 21 3/8 21 3/8 21 3/8 21 3/8 21 3/8 na

600 Absorber 40 5/8 40 5/8 40 5/8 40 5/8 40 5/8 na

Evaporator 40 5/8 40 5/8 40 5/8 40 5/8 40 5/8 na

Condenser 40 5/8 40 5/8 40 5/8 40 5/8 40 5/8 na

Generator 20 3/8 20 3/8 20 3/8 20 3/8 20 3/8 20 3/8 20 3/8 20 3/8 20 3/8 20 3/8 na

700 Absorber 39 ¼ 39 ¼ 39 ¼ 39 ¼ 39 ¼ 39 ¼ na

Evaporator 39 ¼ 39 ¼ 39 ¼ 39 ¼ 39 ¼ 39 ¼ na

Condenser 39 ¼ 39 ¼ 39 ¼ 39 ¼ 39 ¼ 39 ¼ na

Generator 19 5/8 19 5/8 19 5/8 19 5/8 19 5/8 19 5/8 19 5/8 19 5/8 19 5/8 19 5/8 19 5/8 19 5/8 na

800 Absorber 38 ¼ 38 ¼ 38 ¼ 38 ¼ 38 ¼ 38 ¼ 38 ¼ na

Evaporator 38 ¼ 38 ¼ 38 ¼ 38 ¼ 38 ¼ 38 ¼ 38 ¼ na

Condenser 38 ¼ 38 ¼ 38 ¼ 38 ¼ 38 ¼ 38 ¼ 38 ¼ na

Generator 19 1/8 19 1/8 19 1/8 19 1/8 19 1/8 19 1/8 19 1/8 19 1/8 19 1/8 19 1/8 19 1/8 19 1/8 19 1/8 19 1/8

975 Absorber 35 3/8 35 3/8 35 3/8 35 3/8 35 3/8 35 3/8

Evaporator 46 38 44 ½ 38 46 na

Condenser 52 7/8 53 53 52 7/8 na

Generator 23 3/8 26 ½ 26 ½ 26 ½ 26 ½ 26 ½ 26 ½ 23 3/8 na

1100 Absorber 35 ¼ 35 ¼ 35 ¼ 24 ½ 35 ¼ 35 ¼ 35 ¼ na

Evaporator 47 3/8 47 ¼ 47 ¼ 47 ¼ 47 3/8 na

Condenser 47 1/8 47 47 47 47 1/8 na

Generator 23 5/8 23 ½ 23 ½ 23 ½ 23 ½ 23 ½ 23 ½ 23 ½ 23 ½ 23 5/8

1225 Absorber 35 35 24 7/8 35 35 24 7/8 35 35 na

Evaporator 47 5/8 47 ¼ 47 ¼ 35 ¼ 35 ¼ 47 5/8 na

Condenser 43 1/8 43 1/8 43 1/8 43 1/8 43 1/8 43 1/8 na

Generator 21 9/16 21 9/16 21 9/16 21 9/16 21 9/16 21 9/16 21 9/16 21 9/16 21 9/16 21 9/16 21 9/16 21 9/16

1350 Absorber 35 3/8 35 ½ 35 ½ 35 ½ 35 ½ 35 ½ 35 ½ 35 3/8 na

Evaporator 47 5/8 47 ¼ 47 ¼ 47 ¼ 47 ¼ 47 5/8 na

Condenser 47 3/8 47 47 47 47 47 5/8 na

Generator 23 ¾ 23 5/8 23 ½ 23 ½ 23 ½ 23 ½ 23 ½ 23 ½ 23 ½ 23 ½ 23 5/8 23 ¾Table of Tube support locations. Column 1 indicates (inches) from left hand tube sheet to the 1st tube support, column 2 indicates inches between 1stand 2nd supports, column 3 indicates inches between 2nd to 3rd support, and so forth.

Maintenance

Left-Hand TubeSheet to 1st

ABS-M-10A-E454

Table 8 – Tube Support Locations (millimeters)

Unit Size Bundle 1-2 2-3 3-4 4-5 5-6 6-7 7-8 8-9 9-10 10-11 11-12 12-13 13-14

500 Absorber 1089 1089 1089 1089 na

Evaporator 1089 1089 1089 1089 na

Condenser 1089 1089 1089 1089 na

Generator 543 543 543 543 543 543 543 543 na

600 Absorber 1032 1032 1032 1032 1032 n/a

Evaporator 1032 1032 1032 1032 1032 n/a

Condenser 1032 1032 1032 1032 1032 n/a

Generator 518 518 518 518 518 518 518 518 518 518 na

700 Absorber 997 997 997 997 997 997 n/a

Evaporator 997 997 997 997 997 997 n/a

Condenser 997 997 997 997 997 997 n/a

Generator 498 498 498 498 498 498 498 498 498 498 498 498 na

800 Absorber 972 972 972 972 972 972 972 na

Evaporator 972 972 972 972 972 972 972 na

Condenser 972 972 972 972 972 972 972 na

Generator 486 486 486 486 486 486 486 486 486 486 486 486 486 486

975 Absorber 899 899 899 899 899 899

Evaporator 1168 965 1130 965 1168 n/a

Condenser 1343 1346 1346 1343 na

Generator 594 673 673 673 673 673 673 673 na

1100 Absorber 895 895 895 622 895 895 895 na

Evaporator 1203 1200 1200 1200 1203 na

Condenser 1197 1194 1194 1194 1197 na

Generator 600 597 597 597 597 597 597 597 597 600

1225 Absorber 889 889 632 889 889 632 889 889 na

Evaporator 1210 1200 1200 895 895 1210 na

Condenser 1095 1095 1095 1095 1095 1095 na

Generator 548 548 548 548 548 548 548 548 548 548 548 548

1350 Absorber 899 902 902 902 902 902 902 902 na

Evaporator 1210 1200 1200 1200 1200 1210 na

Condenser 1203 1194 1194 1194 1194 1210 na

Generator 603 600 597 597 597 597 597 597 597 597 600 603Table of Tube support locations. Column 1 indicates (mm) from left hand tube sheet to the 1st tube support, column 2 indicates mm between 1st and2nd supports, column 3 indicates mm between 2nd to 3rd support, and so forth.

Maintenance

Left-Hand TubeSheet to 1st

ABS-M-10A-E4 55

Periodic PurgeMaintenance

The following information describesthe maintenance requirements ofthe purge system. To assure efficientand reliable machine operation,perform all inspections andprocedures at the prescribedintervals. Keep a record of allinspection results to establishproper service intervals anddocument changes that occur inpurge activity that could reflect onchiller performance.

Purifier Purge The following sections describe therequired periodic maintenance:

WeeklyCheck the vacuum pump oil quality.

Semi-AnnuallyInspect the air-cooled condensingunit coil and clean as needed. Cleanthe coil from the fan side usingcompressed air or coil cleaner. Afouled coil will reduce purgeefficiency and capacity.

Purge Vacuum Pump and MotorAssembly

Drive Belt Checkout and Adjustment

WWAARRNNIINNGG

Do not touch the belt while it isrotating.

Serious personal injury can resultfrom contact with rotating parts.Turn power OFF before servicingbelt.

CCAAUUTTIIOONN

Belt tension maintenance isimportant. Too tight or looseadjustment can cause damage tothe shaft bearings. Too loose anadjustment allows the belt to slipand shorten the lifetime of the belt.

1. Check pulley alignment and V-belttension. The belt should depressabout 1/2 to 3/4" [13 to 19 mm]under light hand pressure appliedto midway between the pulleys.Belt adjustments are made byloosening the motor hold-downbolts and sliding the motortoward or away from the vacuumpump as required.

2. Adjust the tension of the belt onceagain a week after unit operationto compensate for stretch due tobreak-in.

3. The adjustment of the belt tensionshould be made by parallelshifting of the motor. Tightenadjusting nuts or bolts securelyafter adjustments.

4. If required, clean the purge drivebelts with an approved beltcleaner.

Periodic Checking

Check the following pointsperiodically.

1. Check if bolts and nuts are tight.

2. Check to see if the gas ballastvalve and solenoid valve isoperable.

3. Check for leakage of oil from theshaft seal or pump casing.

4. Replace vacuum pump oilperiodically to maintain pumpperformance. Check the oilturbidity through the oil levelwindow.

Oil ReplacementReplace oil when the ultimatepressure of the pump itself isunsatisfactory or the oil becomestoo dirty. Although the oil becomessomewhat dirty during operation,the pump can be operated providingan adequate suction vacuum isobtained. Milky oil indicates highmoisture content. Excessivepumping and/or purging whennoncondensables are not presentwill cause water vapor to be drawnfrom the chiller which condensesinto the oil. Limit the use of servicepumpout and verify correct ballastsettings, and verify timed pumpoutsettings.

Replace the oil using the followingprocedures:

1. Warm the oil by operating thepump for approximately fifteenminutes with the intake closed.Stop the purge operation fromoperator setting group menu.Open the drain oil cock and drain,almost all the oil. Most of the oilwill drain out freely.

WWAARRNNIINNGG

Do not touch the belt while it isrotating.

Serious personal injury can resultfrom contact with rotating parts.Turn power OFF before servicingbelt.

The small residue remaining in thepump can be forced out by turningthe pump pulley by hand, with theexhaust port closed and the intakeopen. The oil will spurt out suddenlyand should be deflected into thedrain pan. Avoid extensive operationwith the exhaust port sealed;excessive internal pressure mayloosen the shaft seal.

WWAARRNNIINNGG

Use extreme care. The oil will behot and can cause severe burns.

Maintenance

ABS-M-10A-E456

Oil Filling

2. After removing all oil, close thedrain and pour three or fourounces of clean Duo-seal oil intothe intake port. Open the exhaustport and run the pump for a shortperiod to completely circulate thenew oil. Drain the oil and forceout the residue as above. Repeatflushing with new Duo-seal oiluntil flushing remains clean andfree of color and foreign matter.One or two flushings normallycleans accumulated residue andprotects the pump.

Operate the pump and check theultimate vacuum achievable.

3. Repeat steps 1 - 2 several times ifthe pump does not perform.

4. Replace the dust cap. Start thepurge pump with the manualhand valve closed and allow it tooperate one hour to warm the oil.Recheck the oil level with the oilat operating temperature.

Recommended OilWelch Duo Seal Oil, Oil-1

Once a YearLubricate the purge pump motorwith a good grade of machine oil.

Solution Maintenance

To maintain machine efficiency, thelithium bromide solution must beanalyzed periodically to determine ifthe inhibitor levels are withinacceptable limits. A laboratory testis required to determine theinhibitor level (and other additivelevels), and any necessaryadjustments. To maintain the correctlevels, additive and inhibitor mustbe added periodically to the lithiumbromide solution. It isrecommended that the solution beanalyzed once a year if the machineis used for comfort cooling andtwice a year if it is in continuous orcritical. (Monitor the lapse timemeter and provide this informationwhen lithium bromide analysis isperformed). Contact your local TraneService Agency for qualified labtesting.

Air leaks will accelerate inhibitordepletion resulting in excessivehydrogen production. Sinceabsorption machines are unable tocool effectively when excessivehydrogen is formed, machineoperation under these conditions isnot recommended until the leak iseliminated.

Note: This machine uses lithiumbromide inhibited with lithiummolybdate and lithium hydroxide.Lithium bromide that contains otherinhibitors cannot be used in thisequipment.

Solution Filter

Rinsing the FilterAs the filter is used to remove solidsfrom the lithium bromide solution,some inhibited solution (lithiummolybdate in the lithium bromide)will be collected with the solids.Periodically this inhibited solutionmust be returned to the solution forproper filter operation and beforeany time the filter is cleaned.Introducing refrigerant water todilute the brine solution will returnthe lithium molybdate inhibitedsolution but not remove the filteredout solids and particles. Also, thiswill allow for easier filter elementcleanup or changeout since theservicer will be dealing withprimarily refrigerant water versus astronger lithium bromideconcentration.

The filter assembly should not beused for continuous operation. Itshould be periodically valved intooperation as needed for cleanuppurposes only. If the filter has beenin operation for more than onemonth, the following proceduremust be completed to insure properoperation and solution maintenance.

ProcedureBefore opening the filter to clean orexchange elements, the followingshould be completed:

1. Close the inlet feed valve (LTSP onHorizon) stopping the flow ofLithium Bromide to the filter.

2. Open the refrigerant pumpdischarge service valve and theservice valve from step 1. Thepurpose is to provide refrigerantflow through the filter assembly.

3. Operate the refrigerant pump forapproximately 5 minutes. Do notexceed 10 minutes as this maycause excessive lost of refrigerantwater. The refrigerant flow will bethrough the filter and returning tothe brine side of the chiller.Operation of the pump for toolong a period could deplete allrefrigerant water. Continueprocedure until the entire filtercanister feels cold.

4. Close the refrigerant pumpdischarge valve and the filterassembly service valve.

5. Change or clean filter elements asneeded. Refer to Cleaning theFilter.

Maintenance

ABS-M-10A-E4 57

Cleaning the FilterPeriodic cleaning of the filter isnecessary. Experience has shown anew filter, versus a full or pluggedfilter, will have negligible differentialpressure between the inlet andoutlet; therefore other means ofdetermining flow can be used, forexample, a sight glass, flow meters,and so forth. The particle size ratingfor the cleanable filter isapproximately 150 micron. Thedisposable filter is rated atapproximately 30 microns. Whilethese should not be consideredabsolute values, they do provide arange of cleanliness that thesolution can attain. These ratingsare based on nominal flow and willvary as flow rates vary.

To clean the filter, follow the givenprocedure.

Precaution: As will all chemicals,avoid getting the solution ON YOUor IN YOU. Do not eat or drink whilehandling the Lithium Bromidesolution. The technician should usepersonal protective handlingequipment. This should include, butnot limited to, gloves for handprotection, splash goggles or safetyglasses, and an apron or equivalentfor body protection.

CCAAUUTTIIOONN

LITHIUM BROMIDE!

LITHIUM BROMIDE IS NORMALLYNONTOXIC; HOWEVER, OTHERCHEMICALS MIXED WITH THESOLUTION CAN CAUSE IRRITATIONAND ADDITIVE VAPORS CANCAUSE NAUSEA. ALWAYS PROVIDEVENTILATION TO REMOVEACCUMULATED VAPORS.

In case of accidental contact with thesolution, wash the affected area withwater immediately.

Precaution: Make certain thatappropriate application equipmentis locked and tagged-out safely, asapplicable. This should include, butnot limited to, pumps, motors andother devices that may affectsolution flow or pressure.

1. Close the filter system isolationvalves. This isolates the filtersystem from the unit. Servicingthe filter will not affect unitoperation.

2. Remove the pipe plug from theservice valve locatedimmediately next to the filter.Open the valve to break thevacuum in the filter system. Acontainer may be necessary tocatch solution draining from thevalve.

3. Open the filter assembly byloosening the filter assemblybolt located in the center of thefilter head. The filter may bedrained prior to disassembly viathe drain bolt located on thebottom of the filter tank.

4. Remove the filter tank from thefilter head.

5. Clean the filter tank and thereusable filter element. Theelement is most effectivelycleaned by backwashing with ahigh-pressure spray device.

6. Place the clean element in thefilter tank.

7. Reassemble the filter, makingsure that the o-rings are properlyseated. A thin layer of siliconegrease applied to the o-ringsassures a leaktight seal.

8. Tighten the filter assembly bolt.This should be torqued to 50-55ft-lbs.

9. Use the service valve locatedimmediately next to the filter toevacuate the filter system. Afterevacuation, close and plug thevalve.

10. Open the filter system isolationvalves.

Maintenance

ABS-M-10A-E458

Pump Operational Careand Maintenance

OperationFirst time operation — on initialoperation or after installation oroverhaul, make the following checksbefore putting the unit back intooperation. Be sure pump iscompletely filled with liquid. Rununit for only a few seconds to makesure it operates smoothly. Thereshould be no unusual vibration,grinding, or scrapping noises.

CCAAUUTTIIOONN

Do not run this unit dry. Evenmomentary operation withoutpump and motor casing filled withliquid will damage bearings.

If pump trips on overload currentperform the following checks:

a. Note discharge pressure with thepump running.

b. Stop motor, but do not close oradjust valves.

c. Disconnect all power.

d. Reverse any two line leads atmotor starter to reverse directionof rotation.

e. Start motor and note dischargepressure. The direction of rotationthat provides the higher dischargepressure is the correct rotation.

Pump MaintenanceThe solution pump should bedisassembled and inspected atroutine intervals. The need toinspect or service the pumps areexpected to be very infrequent. Theexpected interval between start-upand the first parts replacement isapproximately 50,000 hours ofnormal operation. This assumesproper solution analysis andmaintenance is performed. Highamounts of suspended solids mayreduce the design life. Parts shouldbe replaced as determined by aqualified Trane Service Engineer.

Since the interval betweeninspection and repair is quite long itis logical to replace the wearingcomponents to a like new conditionanytime that the pumps are opened.Therefore pump parts should beordered and on hand any time thepumps are opened. Table 9 indicatesitems that should be inspected andthe action to be taken, whenever thepumps are opened. For cutawayview of pump see Figure 29.

WWAARRNNIINNGG

Certain procedures common torefrigeration system service mayexpose operating and/or servicingpersonnel to liquid and/or vaporousrefrigerant. To avoid injury or deathdue to skin exposure or inhalationof refrigerant, closely follow allsafety procedures described in thematerial safety data sheet, and to alllabels on refrigerant containers.

Only certified service personnelshould service the refrigerantsystem. To avoid injury or death dueto electrical shock, never openaccess panels to inspect or servicethe unit without first opening alldisconnect switches.

Use caution when working oncertain areas of this unit. Surfacetemperatures may exceed 150°F[65.1°C] on the condensing unit.Contact with bare skin could resultin burns and injuries.

Maintenance

Table 9 – Pump Inspection ItemsItem Inspection Action ReplaceImpeller Balance Remove Material to Balance If RequiredWearing Rings Clearance .006/.009” Nominal Replace if 2 times nominal

[.15/.23 mm] NominalBearings Axial Wear 3/16” [4.8 mm] Maximum Allowed XRotor/Journal Scoring Visual Check If Scored Replace with new motorRotor/Stator Liners Wear/Scrapping Adjust/Repair/Replace If Cannot RepairCirculation Passages (Clean) Clean Check/Clean N/AMotor Lead Insulation Abrasion Shrink-wrap/Tape If RequiredMotor Windings Megohm Dry Out in Oven If RequiredCheck All Parts Check for Cracks/Wear Repair or Replace N/A

ABS-M-10A-E4 59

Solution Pumps

This section provides detail of thethree pumps located on themachine. Also, this section includesmotor and pump construction andpump motor cooling and lubrication.

PumpsThere are three individual pumpsoperating within the absorptioncycle. Refer to the absorption cyclefluid schematic, Figure 3, whichillustrates the fluids and pipingarrangements associated with eachpump.

• The low temperature solutionpump (LTSP) supplies dilutelithium bromide solution from theabsorber through the heatexchanger then to the lowtemperature generator forconcentration.

• The absorber spray pump (ASP)supplies intermediate solution,which is a mixture of dilute andconcentrated to the absorbersprays.

• The refrigerant pump (RP) suppliesrefrigerant to the evaporatorsprays.

The (LTSP) and (ASP) operate atvariable speeds. A solid-stateadjustable frequency drive (AFD)controls motor speed in response toan analog signal provided by theunit control module. The AFD alsoserves as the start/stop andovercurrent device for theassociated pump motors.

The refrigerant pump (RP) operatesat constant speed controlled bymotor starter contactors. Therefrigerant pump circuit has anindividual current overloadprotection device, and each pumphas a winding temperaturethermostat.

Motor and Pump ConstructionThe pump is a single stage,hermetically sealed, centrifugalpump designed for Absorptionapplication. The pump and motorconsists of two sections: the motorstator shell, and the pump casing.The motor and impeller can beremoved from the pump casingwithout disturbing suction anddischarge piping by first separatingthe two sections, then removing themotor rotor and impeller with themotor stator shell as an assembly.The rotor is supported with two self-centering bearings that areinternally tapered to mate withcomplimentary shaped journals onmotor shaft. A coil spring holds thebearings in firm contact with thejournals and compensatesautomatically for wear.

Motor Cooling and LubricationPart of the pumped liquid flows fromthe casing volute through a spacingbetween the wearing ring housingand the attached bearing cap in thewearing ring housing assemblythrough the bearing cap flange tothe cavity between the welded statorliner and rotor liner. The liquidreturns to the pump suction throughthe hollow shaft. The liquid coolsand lubricates the bearings, andcarries away heat generated by themotor rotor and stator.

Maintenance

ABS-M-10A-E460

Pump Identification and Parts List2 Casing3 Impeller9 Casing Wearing Ring10 Motor Side Wearing Ring15A Impeller Locking Screw16B Impeller Locking Washer17 Feather Key (Impeller)65 Casing Gasket107 Stud109, 109A Nut124, 224 Lockwasher201 Motor Field Shell202 Adapter Flange205 Bearing Cap

208 Wearing Ring Housing209 Terminal Box Cover210 Bearing (Front End)210A Bearing211 Bearing Journal212 Rotor end Plate216 Stator Liner (Can)220 Nameplate221 Rotor Liner222 Stator Core (Winding)223 Rotor Core229 Rotor Shaft231 Terminal Box250 Coil Spring

Maintenance

Figure 29 – Typical Pump Assembly and Recirculation Liquid Flow

ABS-M-10A-E4 61

AFD Maintenance

Periodically, inspect the AFD asdescribed in Table 10, to preventaccidents and to ensure highperformance reliability.

Table 10 – AFD Component Check and Corrective ActionExternal Terminals, Connectors, Mounting Screws, and so forth Loose screws or connectors Securely tighten.Heat Sink Build-up of dust and dirt

Printed Circuit Board (PCB) Accumulation of conductive dust or oil

Cooling Fan For abnormal noise and vibration Replace the cooling fan.Cooling Fan Debris on fan blades. Blow off and wipe, if necessary.Power Components Accumulation of dust and dirt

Smoothing Capacitor Discoloration or odor Replace the capacitor or the AFD.

Maintenance

Blow with dry, compressed air [39.2x104 to 58.8x104 Pa(4 to 6 kg cm2) pressure]Blow with dry, compressed air 39.2x104 to 58.8x104 Pa(4 to 6 kg cm2) pressure]. If dust and oil cannot beremoved, replace the board.

Blow with dry, compressed air [39.2x104 to 58.8x104 Pa(4 to 6 kg cm2) pressure].

WWAARRNNIINNGG

To prevent electrical shock,disconnect all power beforeservicing the inverter and then waitat least five minutes after the powersupply is disconnected and all LED’sare extinguished.

ABS-M-10A-E462

General Information

The following section containsgeneral troubleshootinginformation. When an abnormalmachine condition exists, the unitcontrol panel clear language display(CLD) will indicate the condition anda brief message. Always determinethe cause and perform correctiveaction before you restore fullmachine operation.

Review the indicated message andproceed to the appropriate sectiondefined below.

Control Panel OperatorInterface (Clear LanguageDisplay) Diagnostics

There are three types of diagnosticsscreens. They are:

“Informational Warning Only” (IFW)diagnostics that do not shutdownthe chiller.

“Machine Shutdown AutomaticReset” (MAR); This diagnostic turnsthe MAR alarm relay ON, howeverthe machine will automatically resetand allow restart when the conditioncorrects itself.

“Machine Shutdown ResetRequired” (MMR); This diagnosticturns the MMR alarm relay “ON”.The alarm relay turns “OFF” whenthe diagnostic is manually reset.

The second line of the diagnostictypically identifies additionalinformation intended to assist theoperator to define and correctproblems. Contact the local TraneService Representative forassistance when necessary.

The reason for all diagnostic mustbe determined and corrected. Do notreset and restart the chiller as thiscan cause a repeat failure.

After corrective action, the chillercan be reset and/or restarted. In thecase of “Unit Shutdown - ResetRequired” diagnostic types, thechiller will have to be manually resetthrough the Diagnostics groupmenu.

Note: For more information and anoverview of the various types ofscreens see “Operators Guide:Using the control panel” (wherediagnostics group menu of the clearlanguage display (CLD) is explained.

Adjustable FrequencyDrive – AFD

AFD Self-DiagnosticsThe AFD controls frequency driveoperation. In the case of an AFDabnormal fault conditions, theChiller clear language display willindicate absorber spray pump, orlow temp generator pump “DriveFault.” The AFD display will indicatethe current fault condition. If a faultcondition occurs, use the referenceinstruction manual and/or call thelocal Trane Service agency todiscuss the fault and determine thecause.

Pump Troubles andCorrections

In the event that trouble occurs referto the Troubleshooting Chart, Table11, for a listing of the more commonpump troubles and probable causes.

CCAAUUTTIIOONN

If the pump has stopped forunknown reasons, the motor maybe grounded to full line voltage.Disconnect primary power beforeproceeding.

Troubleshooting and Diagnostics

ABS-M-10A-E4 63

Probable Causes

1. Motor Incorrectly Wired. Refer tounit wiring diagram and motorwiring diagram on inside ofmotor terminal box cover.

2. Incorrect Motor Voltage. Voltageat motor terminals must bewithin 10% of motor nameplatevoltage. Check voltage at load-side terminals on motoroverload.

3. Fuses Blown. Replace usingcorrect fuse size. See panelnameplate.

4. Thermal Overload ProtectionOpen. With power removed,remove the wires from K1 andK2 and check for continuity fromK1 and K2 of the motor. If circuitis open, allow motor to cool andcheck continuity again. If stillopen, call service to checkmotor.

5. No Current In One Line To Motor.Check voltage on all lines.Voltages must be within 10% ofnameplate voltage and (current)not more than 20% unbalanced.

6. Motor Winding Grounded ToMotor Frame. REMOVE ALLPOWER. Contact you local Traneservice representative.

7. Motor Windings Open. REMOVEALL POWER. With motor leadsdisconnected, check each motorwinding resistances. Valuesshould be within 10%.

8. Foreign Object in Motor orPump. REMOVE ALL POWER.Reconnect motor leads with anytwo leads interchanged: trystarting the motor in reversedirection. If pump runs,reconnect to original connectionand determine if pump nowruns. This procedure willsometimes remove a smallobstruction blocking the unit.

9. Pump Not Running. Check powersupply to assure power is at lineside of motor starter.

10. Impeller Clogged. Inspectimpeller and removeobstructions.

11. Pump Not Completely Primed.Completely fill pump andsuction line, and purge unit.

12. Air Leaks In Suction Piping.Inspect suction piping, gaskets,and fittings. Repair or replace asnecessary.

13. Air Or Gases In Liquid. Purgeunit, repair system to excludenon-condensables.

14. Motor Overheating. Investigateand eliminate cause ofoverheating.

15. System Temperature HigherThan Design Temperature. Checkand correct temperature. Checkmachine cycle temperatures.

16. Wrong Direction Of Rotation.Reverse direction of rotation.

17. Obstruction In Piping System.Inspect piping, removeobstruction.

18. Mechanical Defects. Check forworn wearing rings, damagedimpeller, worn or seizedbearings, or damaged springs.

19. Speed Too Low. Check powersupply and control, or excessmechanical or hydraulic loads.

20. Speed Too High. Check powersupply and control, or loss ofmechanical or hydraulic loads.

21. Foreign Material In CloseRunning Fits Of Unit.Disassemble and cleanthoroughly.

22. No Fluid Flowing Through Motor.Fluid must circulate throughwearing ring-housing spacingand holes in wear ring (208) andback through hollow shaft (229)to the pump suction.

23. Noise Caused By OtherEquipment. Investigate andcorrect.

24. Loose Parts. Inspect pump.Tighten, repair, and replace asnecessary.

25. Magnetic Hum Due To ElectricalInput. Check for high orunbalanced voltage or brokenline. Voltage must be within 10%of motor nameplate voltage and(current) not more than 20%unbalanced.

26. Mechanical Unbalance. Checkwith a vibration meter or bypIacing hand on unit. Dismantleand correct balance.

27. External Loading On Pump.Check for external mechanicalstress on pump from suctionand discharge piping. Adjust oradd support if necessary.

28. Bearing or Spring DamagedCausing Binding. Remove,disassemble, and inspect parts.

29. Condensate Due To Change InTemperature. When subjected tochanges in temperature, liquidcondenses on the encapsulatedstator windings and must bepermitted to drain out of thecondensate drain holes providedin the stator housing.

30. Hole In Stator Can. If liquiddraining from pump is pumpagerather than condensate, theremay be a hole in the stator can.Disassemble and inspect.

TroubleshootingChecklist

Table 11 – Troubleshooting ChartTrouble Probable Cause (Item Number)Pump will not start 1 2 3 4 5 6 7 8Pump will not deliver liquid 9 10 11 12 13 14 15 17Pump loses prime after starting 10 11 12 13 14 15 17Capacity too low 10 11 12 13 14 15 16 17 18 19Discharge pressure too low 10 11 12 13 14 15 16 17 18 19Pump motor overload 1 2 5 8 10 15 16 18 20, 21Motor overheats 1 8 15 16 17 18 19 20 21 22Noisy installation 11 12 13 14 15 17 18 20 23 24 25 26 27 28Excessive vibration 24, 26, 28Excessive maintenance 2 10 11 12 13 14 15 16 17 18 20 21 22 24 26 27 28Leakage from motor frame 29 30

ABS-M-10A-E464

External ElectricalConnections

The electrical wiring in this sectionis intended to show the relationshipbetween externally connecteddevices that are needed by thecontrol panel to sequence themachine.

If there is a machine diagnosticcondition occurring the main controlpanel clear language display willprovide a message, and basictroubleshooting can be performed.The local Trane service agency canprovide qualified personnel forassistance to test appropriate pointswithin the electrical system; fieldwiring to the machine, or machinewiring.

Required

Inputs and outputs that must beprovided are identified as Required.Required wiring is used to providereliable machine operation. Failureto provide this wiring may causemachine failure.

Acronyms

1. Binary Output (contact closure)(BO)

2. Binary Input (BI)

3. Analog Input (4-20 mA or 2-10Vdc) (AI)

4. Analog Output (AO)

External

The electrical connections betweenthe machine and external devicesthat are not machine mounted areillustrated in Figure 30.

The chiller control system must befield wired to the items identified asREQUIRED. Other items areidentified as recommended oroptional.

Unit WiringDiagrams

ABS-M-10A-E4 65

Required Wiring includes:Chilled water pump control (start and stop) 1U3-J12-1-2 BOChilled water pump flow switch 1TB3-9-10 BICondenser water flow control (start and stop) 1U3-J14-1-2 BOCondenser water flow switch 1TB3-11-12 BIEnergy Valve 1U5-J8-1-4 BOSteam transducer 1U3-J9-1-10 AI

OptionalOptional use inputs and outputs are identified Optional. These connection points are not required because thecondition of use does not effect machine reliability or operation. Note: 1U7, 1U8, 1U9 and 1U10 are optional modulesthat are provided when specified on the sales order.

Optional Status Wiring (Standard):Limit Warning status 1U3-J20-1-2 BOAlarm, Manual Reset required status (MMR) 1U3-J18-1-3 BOAlarm, Auto Restart status (MMR) 1U3-J22-1-2 BOAlarm, Purge Status 1U4-J16-1-3 BO

Output SignalHot water pump flow control (start and stop) 1U3-J10-1-2 BO

Optional Input Signals (Standard):External auto start and stop N.C. (local auto mode required) 1U3-J5-1-2 BIEmergency Stop N.C. (Manual reset required) 1U3-J5-3-4 BIOutdoor air temperature sensor for CWR 1U3-J5-5-6External Chiller Capacity Limit Enable (Jumper

(1U3-J7 1 to 2) Closed = Enable) BI

External Chiller Capacity Limit Analog Input 1U3-J711 (-) to 12 (+) AI

Optional Modules not Provided Unless Specified on the Sales Order1U7 – Options Module1U8 – Tracer Communications Module

Options Module required for the following:

Optional Status:Maximum Capacity status 1U7-J14-1-2 BO

Optional Control:Tracer controlled relay 1U7-J18-1-3 BOTower Temporary Low Relay 1U7-J20-1-2 BO

Optional Inputs:Tracer temperature sensor 1U7-J7-7-8External Chiller water Set point isolated 2-10 Vdc or 4-20 mA 1U7-J9-4-5 AI

Optional OutputSteam or Hot Water Valve Energy Valve Monitor Output 1U7-J7-1-2 AO

Optional modules for communications outside of main unit control panel.

1U8 Tracer Communications moduleRequired for Comm. with Tracer 1U8-J3-1-2

Unit WiringDiagrams

ABS-M-10A-E466

Figure 30 – Field Wiring Connection Diagram – Detail of Control Panel Connection Points

Unit WiringDiagrams

ABS-M-10A-E4 67

Unit WiringDiagrams

ABS-M-10A-E468

Unit WiringDiagrams

ABS-M-10A-E4 69

Unit WiringDiagrams

ABS-M-10A-E470

The chiller control panel requiresproof of water flow for bothevaporator (chilled) and absorbercondenser circuits. A flow switchand motor starter auxiliary contactconnections satisfy thisrequirement. This input must behard wired to the chiller controlsystem. The flow switch must be setto open when flow drops to 70% orbelow of design evaporator flow.

CCAAUUTTIIOONN

The control panel is designed with acontact closure used for control ofthe water pump operation. Theevaporator and condenser waterpumps are electrically interlockedand sequenced by the control panel.Proof of both chilled and condenserwater flow must be provided to thecontrol panel. Under no conditionscan chiller operation be terminatedby stopping chilled water flow.Under no situation can condenserwater flow exist without chilledwater flow.

The above interlocking arrangementassures proper sequence ofoperation, and helps provideprotection against mechanicalfailure from improper operation.

Required Absorber and CondenserWater Flow ControlThe chiller requires start and stopcontrol of the absorber andcondenser water flow. Thecondenser pump motor starter andwater flow control signal must behard wired in series with the chillerpanel output contacts provided.Condenser water flow must startand stop as determined by thecontrol panel. Failure to stop flowrisks evaporator freeze-up.

CCAAUUTTIIOONN

Damage caused by operationwithout proper water pump andflow sensing interlocking is notwarranteed.

Required Chilled Water Flow ControlThe chiller requires start and stopcontrol of the chilled water flow. Thechiller controls also provide a chilledwater pump off delay feature. Underno conditions can chiller operationbe terminated by stopping chilledwater flow. For remote start/stopcontrol, always use theauto/start/stop input of the chillerand allow chilled water flow tocontinue up to thirty minutes aftertermination of the machine dilutioncycle.

Table and FiguresTables 12 and 13 provide electricaldata by voltage and unit size.

Table 14 identifies electrical devicesand their description.

Figures 32 to 35 illustrate typicalmachine wiring and field connectedwiring. These schematics are typical,therefore, refer to the schematicdiagrams supplied with theparticular chiller control panel thatreflect the actual wiring “as built.”

Figures 36 to 40 illustrate connectionpoints of unit and control panelwiring.

Unit WiringDiagrams

ABS-M-10A-E4 71

Table 12 – ABSD 500-1350 Ton – 50 Hertz Electrical Data

Voltage FLA HP KW FLA HP KW FLA HP KW FLA HP KW190 12.0 3.0 2.3 25.0 5.0 3.7 25.0 5.0 3.7 62.0 13.0 9.7 10.5 79 80

500 220 10.4 3.0 2.3 21.0 5.0 3.7 21.0 5.0 3.7 52.4 13.0 9.7 9.1 67 70380 6.0 3.0 2.3 12.0 5.0 3.7 12.0 5.0 3.7 30.0 13.0 9.7 5.3 38 40415 5.5 3.0 2.3 11.0 5.0 3.7 11.0 5.0 3.7 27.5 13.0 9.7 4.8 35 35190 12.0 3.0 2.3 25.0 5.0 3.7 25.0 5.0 3.7 62.0 13.0 9.7 10.5 79 80

600 220 10.4 3.0 2.3 21.0 5.0 3.7 21.0 5.0 3.7 52.4 13.0 9.7 9.1 67 70380 6.0 3.0 2.3 12.0 5.0 3.7 12.0 5.0 3.7 30.0 13.0 9.7 5.3 38 40415 5.5 3.0 2.3 11.0 5.0 3.7 11.0 5.0 3.7 27.5 13.0 9.7 4.8 35 35190 12.0 3.0 2.3 30.0 7.5 5.6 25.0 5.0 3.7 67.0 15.5 11.6 10.5 85 90

700 220 10.4 3.0 2.3 26.0 7.5 5.6 21.0 5.0 3.7 57.4 15.5 11.6 9.1 73 80380 6.0 3.0 2.3 15.0 7.5 5.6 12.0 5.0 3.7 33.0 15.5 11.6 5.3 42 45415 5.5 3.0 2.3 14.0 7.5 5.6 11.0 5.0 3.7 30.5 15.5 11.6 4.8 39 40190 12.0 3.0 2.3 30.0 7.5 5.6 25.0 5.0 3.7 67.0 15.5 11.6 10.5 85 90

800 220 10.4 3.0 2.3 26.0 7.5 5.6 21.0 5.0 3.7 57.4 15.5 11.6 9.1 73 80380 6.0 3.0 2.3 15.0 7.5 5.6 12.0 5.0 3.7 33.0 15.5 11.6 5.3 42 45415 5.5 3.0 2.3 14.0 7.5 5.6 11.0 5.0 3.7 30.5 15.5 11.6 4.8 39 40190 25.0 5.0 3.7 25.0 5.0 3.7 30.0 7.5 5.6 80.0 17.5 13.0 10.5 98 100

975 220 21.0 5.0 3.7 21.0 5.0 3.7 26.0 7.5 5.6 68.0 17.5 13.0 9.1 84 90380 12.0 5.0 3.7 12.0 5.0 3.7 15.0 7.5 5.6 39.0 17.5 13.0 5.3 48 50415 11.0 5.0 3.7 11.0 5.0 3.7 14.0 7.5 5.6 36.0 17.5 13.0 4.8 44 45190 25.0 5.0 3.7 30.0 7.5 5.6 30.0 7.5 5.6 85.0 20.0 14.9 10.5 103 110

1100 220 21.0 5.0 3.7 26.0 7.5 5.6 26.0 7.5 5.6 73.0 20.0 14.9 9.1 89 90380 12.0 5.0 3.7 15.0 7.5 5.6 15.0 7.5 5.6 42.0 20.0 14.9 5.3 51 60415 11.0 5.0 3.7 14.0 7.5 5.6 14.0 7.5 5.6 39.0 20.0 14.9 4.8 47 50190 25.0 5.0 3.7 30.0 7.5 5.6 30.0 7.5 5.6 85.0 20.0 14.9 10.5 103 110

1225 220 21.0 5.0 3.7 26.0 7.5 5.6 26.0 7.5 5.6 73.0 20.0 14.9 9.1 89 90380 12.0 5.0 3.7 15.0 7.5 5.6 15.0 7.5 5.6 42.0 20.0 14.9 5.3 51 60415 11.0 5.0 3.7 14.0 7.5 5.6 14.0 7.5 5.6 39.0 20.0 14.9 4.8 47 50190 25.0 5.0 3.7 30.0 7.5 5.6 30.0 7.5 5.6 85.0 20.0 14.9 10.5 103 110

1350 220 21.0 5.0 3.7 26.0 7.5 5.6 26.0 7.5 5.6 73.0 20.0 14.9 9.1 89 90380 12.0 5.0 3.7 15.0 7.5 5.6 15.0 7.5 5.6 42.0 20.0 14.9 5.3 51 60415 11.0 5.0 3.7 14.0 7.5 5.6 14.0 7.5 5.6 39.0 20.0 14.9 4.8 47 50

Unit WiringDiagrams

UnitSize


4B2 Absorber SprayPump Motor

4B3 Low TemperatureSolution Pump Motor

Total Motor Rating

ControlCircuitAmps

MinimumCircuit

Ampacity

MaximumFuse Size

ABS-M-10A-E472

Unit WiringDiagrams

Table 13 – ABSD 500-1350 Ton – 60 Hertz Electrical Data

Voltage FLA HP KW FLA HP KW FLA HP KW FLA HP KW200 13.0 3.0 2.3 28.0 5.0 3.7 28.0 5.0 3.7 69.0 13.0 9.7 10.0 86 90

500 230 12.0 3.0 2.3 24.0 5.0 3.7 24.0 5.0 3.7 60.0 13.0 9.7 8.7 75 80460 6.0 3.0 2.3 12.0 5.0 3.7 12.0 5.0 3.7 30.0 13.0 9.7 4.4 37 40575 5.0 3.0 2.3 10.0 5.0 3.7 10.0 5.0 3.7 25.0 13.0 9.7 3.5 31 35200 13.0 3.0 2.3 28.0 5.0 3.7 28.0 5.0 3.7 69.0 13.0 9.7 10.0 86 90

600 230 12.0 3.0 2.3 24.0 5.0 3.7 24.0 5.0 3.7 60.0 13.0 9.7 8.7 75 80460 6.0 3.0 2.3 12.0 5.0 3.7 12.0 5.0 3.7 30.0 13.0 9.7 4.4 37 40575 5.0 3.0 2.3 10.0 5.0 3.7 10.0 5.0 3.7 25.0 13.0 9.7 3.5 31 35200 28.0 5.0 3.7 34.0 7.5 5.6 28.0 5.0 3.7 90.0 17.5 13.0 10.0 109 110

700 230 24.0 5.0 3.7 30.0 7.5 5.6 24.0 5.0 3.7 78.0 17.5 13.0 8.7 94 100460 12.0 5.0 3.7 15.0 7.5 5.6 12.0 5.0 3.7 39.0 17.5 13.0 4.4 47 50575 10.0 5.0 3.7 12.0 7.5 5.6 10.0 5.0 3.7 32.0 17.5 13.0 3.5 39 40200 28.0 5.0 3.7 34.0 7.5 5.6 28.0 5.0 3.7 90.0 17.5 13.0 10.0 109 110

800 230 24.0 5.0 3.7 30.0 7.5 5.6 24.0 5.0 3.7 78.0 17.5 13.0 8.7 94 100460 12.0 5.0 3.7 15.0 7.5 5.6 12.0 5.0 3.7 39.0 17.5 13.0 4.4 47 50575 10.0 5.0 3.7 12.0 7.5 5.6 10.0 5.0 3.7 32.0 17.5 13.0 3.5 39 40200 28.0 5.0 3.7 28.0 5.0 3.7 34.0 7.5 5.6 90.0 17.5 13.0 10.0 109 110

975 230 24.0 5.0 3.7 24.0 5.0 3.7 30.0 7.5 5.6 78.0 17.5 13.0 8.7 94 100460 12.0 5.0 3.7 12.0 5.0 3.7 15.0 7.5 5.6 39.0 17.5 13.0 4.4 47 50575 10.0 5.0 3.7 10.0 5.0 3.7 12.0 7.5 5.6 32.0 17.5 13.0 3.5 39 40200 28.0 5.0 3.7 34.0 7.5 5.6 34.0 7.5 5.6 96.0 20.0 14.9 10.0 115 125

1100 230 24.0 5.0 3.7 30.0 7.5 5.6 30.0 7.5 5.6 84.0 20.0 14.9 8.7 100 110460 12.0 5.0 3.7 15.0 7.5 5.6 15.0 7.5 5.6 42.0 20.0 14.9 4.4 50 60575 10.0 5.0 3.7 12.0 7.5 5.6 12.0 7.5 5.6 34.0 20.0 14.9 3.5 41 45200 28.0 5.0 3.7 34.0 7.5 5.6 34.0 7.5 5.6 96.0 20.0 14.9 10.0 115 125

1225 230 24.0 5.0 3.7 30.0 7.5 5.6 30.0 7.5 5.6 84.0 20.0 14.9 8.7 100 110460 12.0 5.0 3.7 15.0 7.5 5.6 15.0 7.5 5.6 42.0 20.0 14.9 4.4 50 60575 10.0 5.0 3.7 12.0 7.5 5.6 12.0 7.5 5.6 34.0 20.0 14.9 3.5 41 45200 28.0 5.0 3.7 34.0 7.5 5.6 34.0 7.5 5.6 96.0 20.0 14.9 10.0 115 125

1350 230 24.0 5.0 3.7 30.0 7.5 5.6 30.0 7.5 5.6 84.0 20.0 14.9 8.7 100 110460 12.0 5.0 3.7 15.0 7.5 5.6 15.0 7.5 5.6 42.0 20.0 14.9 4.4 50 60575 10.0 5.0 3.7 12.0 7.5 5.6 12.0 7.5 5.6 34.0 20.0 14.9 3.5 41 45

UnitSize


4B2 Absorber SprayPump Motor

4B3 Low TemperatureSolution Pump Motor

Total Motor Rating

ControlCircuitAmps

MinimumCircuit

Ampacity

MaximumFuse Size

ABS-M-10A-E4 73

Unit WiringDiagrams

Figure 32 – ABSD Horizon Single-Stage Steam or Hot Water Absorption with Adjustable Frequency Drives – Main PowerConnection, Starter Control Module and Pump Motors

ABS-M-10A-E474

Unit WiringDiagrams

Table 14

ABS-M-10A-E4 75

Unit WiringDiagrams

Figure 33 – ABSD Horizon Single-Stage Steam or Hot Water Absorption with Adjustable Frequency Drives – Circuit and ChillerControl (See Notes Table 14)

ABS-M-10A-E476

Unit WiringDiagrams

Figure 34 - ABSD Horizon Single-Stage Steam or Hot Water Absorption – Purge and Stepper Control Modules and Local ClearLanguage Display Panel (See Notes Table 14)

ABS-M-10A-E4 77

Unit WiringDiagrams

Figure 35 – ABSD Horizon Single-Stage Steam or Hot Water Absorption – Options Control Module and/or Communication ControlModules (See Notes Table 14)

ABS-M-10A-E478

Figure 36 – Connections: Main Unit Control Panel (Left Side)

Unit WiringDiagrams

6

ABS-M-10A-E4 79

Unit WiringDiagrams

Figure 37 – Connections: Unit Control Panel (Right Side)

ABS-M-10A-E480

Figure 38 – Connections: Unit Control Panel

Unit WiringDiagrams

ABS-M-10A-E4 81

Figure 39 – Connection Diagram – Unit Mounted Controls

Unit WiringDiagrams

ABS-M-10A-E482

Figure 40 – Connection Diagram – Unit Mounted Controls

Unit WiringDiagrams

ABS-M-10A-E4 83

Sensors

The table below Indicates unit sensors, primary function control or monitor, connection points, and the normaloperation temperature range.

Control sensor abnormal will cause a diagnostic shutdown. Monitor sensor abnormal will generate an informationalwarning message only, allowing chiller operation to continue.

Table 15Sensor Application Sensor Primary Function Module

1 Evaporator Entering Water Temperature LCWT Control Chiller2 Evaporator Leaving Water Temperature LCWT Control Chiller3 Absorber Entering Water Temperature ELWT-Fdfwd and Low Tower Limit Chiller4 Absorber Leaving Water Temperature Monitor Chiller5 Cond Leaving Water Temperature Monitor Chiller6 Solution Temperature Leaving Low Temperature Generator Concentration Calculation (LTG) Stepper7 Saturated Evaporator Refrigerant Temperature Evaporator Limit Stepper8 Saturated Condenser Refrigerant Temperature Concentration Calculation (LTG) Stepper9 Differential Evaporator Water Pressure (Optional) Monitor TBD

10 Differential Tower Water Pressure (Optional) Monitor TBD1112131415 Solution Temperature Entering Absorber Control T-Margin Stepper16 Solution Temperature Leaving Absorber Monitor Stepper17 Solution Temperature Entering Low Temperature Generator Monitor Stepper18 Absorber Spray Temperature Monitor Stepper1920 SDR Temperature SDR Logic Circuit21 Supply Steam Pressure (4R2) Control Chiller22 High Temperature Steam Pressure (4R3) Control Chiller23 Entering Steam Temperature or Hot Water Entering Monitor Circuit24 Steam Condensate Leaving CHX or Hot Water Leaving Monitor Circuit

Unit WiringDiagrams

The Trane Company

An American Standard Company

www.trane.com

For more information contactyour local sales office ore-mail us at [email protected]

Since The Trane Company has a policy of continuous product and product data improvement, itreserves the right to change design and specifications without notice.

Only qualified technicians should perform the installation and servicing of equipment referred to inthis publication.

Société Trane – Société Anonyme au capital de 61 005 000 Euros – Siège Social: 1 rue des Amériques – 88190Golbey – France – Siret 306 050 188-00011 – RSC Epinal B 306 050 188Numéro d’identification taxe intracommunautaire: FR 83 3060501888

Literature Order Number

File Number

Supersedes

Stocking Location

ABS-M-10A-E4

SV-RF-000-ABS-M-10A-E4-0901

New

La Crosse

operation maintenance horizon - homesteadhvacrknowlagecenter.homestead.com/abswringdiagram.pdf ·...

Documents