Carrier operating and Service Manual Page 1

Transport Air ConditioningT--356 03/11OPERATION AND SERVICEfor68RM35--610MICROMAX / MCHXRear Mount Air Conditioning UnitR

1--1T--35603/11SECTION 1DESCRIPTION1.1 INTRODUCTIONThis manual contains Operating Instructions, ServiceInstructions and Electrical Data for Model 68RM

1--2T--35603/11Table 1 -1. Model Number ChartMODELNUMBERBATTERY COOLER CONTROL CONDENSERMOTOREVAPORATORMOTORFILTER68RM35--610--1 NO Reheat Wound Field

1--3T--35603/111. Condenser Fan Motor (CM1)2. Filter--Drier Outlet Valve3. Filter--Drier4. Ambient Temperature Sensor5. Filter--Drier Inlet Valve6. Co

1--4T--35603/1121ROADSIDE(RS)CURBSIDE(CS)734561. Electrical Control Panel (See Figure 1-4.)2. Liquid Line Solenoid Valve3. Thermostatic Expansion Valv

1--5T--35603/111. Relay Board2. Logic Board3. CB5 -- Condenser Motor #14. CB4 -- Condenser Motor #25. CB3 -- Evaporator Motor #16. CB2 -- Evaporator M

1--6T--35603/111.3 RELAY BOARD (12--00371--01)a. RelaysK1 Energizes evaporator fans in low speedK2 Energizes evaporator fans in high speed(not energiz

1--7T--35603/111.4 LOGIC BOARDJ1 Logic board power in.J2 Micromate Display interface.J3 Manual control inputs.J4 Interlock Inputs(WTS, low pressure sw

1--8T--35603/111.6 CONTROL PANEL (Full Function Controller)1. Display2. DOWN Button -- decrease selection3. UP Button -- increase selection4. VENT (On

1--9T--35603/111.8 ELECTRICAL SPECIFICATIONS CONDENSER MOTORSMOTOR TYPE(refer to Table 1-1)WOUND FIELD PERMANENT MAGNET* BRUSHLESSVoltage 27 VDC 27 VD

1--10T--35603/111.12 AIR CONDITIONING REFRIGERATIONCYCLEWhen air conditioning (cooling) is selected by thecontroller, the unit operates as a vapor com

SERVICE MANUALOPERATION ANDRearmount68RM35--610Micromax / MCHXBUSAIR CONDITIONINGEQUIPMENT

1--11T--35603/118112109111327262524232220191817161465432152171. Expansion Valve2. Expansion Valve Equalizer Line3. Liquid Line Solenoid Valve4. Expans

2--1T--35603/11SECTION 2OPERATION2.1 STARTING, STOPPING AND OPERATINGINSTRUCTIONS2.1.1 Power to Logic BoardBefore starting, electricalpower must be av

2--2T--356 03/112.1.4 StoppingPlacing the ON/OFF switch in the OFF position orpressing the Micromate ON/OFF button will stop thesystem operation by re

2--3T--35603/112.3.1 Temperature ControlTemperature is controlled by maintaining the return airtemperature measured at the return air grille.2.3.2 Coo

2--4T--356 03/112.3.8.1 Fan MotorOperation Sequence,PermanentMagnet and Wound Field MotorsWhen condenser fan operation is required, themicroprocessor

2--5T--35603/112.4 MICROPROCESSOR DIAGNOSTICSThe Micromate allows the user to interface with themicroprocessor based control. This allows systemparame

2--6T--356 03/11Table 2-2. Parameter CodesCODECODE NAME DESCRIPTIONP1 Return AirTemperatureThis value is the temperature measured by the return air se

2--7T--35603/11Table 2 -2. Parameter Codes -- ContinuedCodeCode Name DescriptionP20 Compressor HoursHighThis is the number of hours of operation that

3--1T--35603/11SECTION 3TROUBLESHOOTINGCAUTIONDo not under any circumstances attempt to service the microprocessor. Should a problem developwith the m

3--2T--356 03/113.3.1 Troubleshooting CAN CommunicationNOTEOn the 12--00693--00 board the CAN commu-nication line pins are on J4--PIN 14(CAN High,CAN_

Safety -- 1 T--35603/11SAFETY SUMMARYGENERAL SAFETY NOTICESThe following general safety notices supplement the specific warnings and cautions appearin

3--3T--35603/11Table 3 -2 Alarm CodesALARMNO.TITLE CAUSE REMEDY CONTROLLERRESPONSEA11 Coil Freeze Coil temperature isless than 32°F andthe compressor

3--4T--356 03/11Table 3 -2. Alarm Codes -- ContinuedALARMNOTITLE CAUSE REMEDY CONTROLLERRESPONSEA21 High Discharge Pressure High discharge pres-sure s

3--5T--35603/11Table 3 -3. General System Troubleshooting ProceduresINDICATION/TROUBLEPOSSIBLE CAUSESREFERENCESECTION3.3.3 System Will Not CoolCompres

3--6T--356 03/11Table 3 -3 General System Troubleshooting Procedures -- ContinuedINDICATION/TROUBLEPOSSIBLE CAUSESREFERENCESECTION3.3.6 Abnormal Noise

T3564--103/11SECTION 4SERVICEWARNINGBesureto observewarningslisted in the safetysummary inthefrontof thismanual beforeperform-ing maintenance on the h

T -3564--203/11VALVE STEM CAPVALVESTEMTO DISCHARGE ORFROM SUCTION LINEPORT TOCOMPRESSORService ValveFrontseated(clockwise)Service ValveBackseated(coun

T3564--303/114.4 PUMPING THE SYSTEM DOWN OR REMOV-ING THE REFRIGERANT CHARGENOTEToavoiddamagetotheearth’sozonelayer ,usearefrigerantrecoverysystemwhen

T -3564--403/11DS71234561. Discharge ServiceValve and Port2. Suction ServiceValve and Port3. Manifold GaugeSet4. Vacuum Pump5. Reclaimer6. Refrigerant

T3564--503/11e. Remove test gas and replace filter--drier .f. Evacuate and dehydrate the system. (Refer to para-graph 4.6.)g. Charge the unit. (Refer

T -3564--603/11g. Preparethecylinderasrequiredtoallowvaporcharg-ing. Backseat the manifold suction valve and chargevapor to build 30 psig pressure on

T--35603 /11Safety - 2SPECIFIC WARNING AND CAUTION STATEMENTSThe statements listed below are applicable to the refrigeration unit and appear elsewhere

T3564--703/114.10 FILTER--DRIER4.10.1 To Check Filter--DrierThe filter--drier (see Figure 4-7) must be changed if thedrierispartiallyrestrictedorservi

T -3564--803/114.1 1.3.Replace Entire V alvea. Perform a low side pump down, refer to paragraph4.4.1. Remove coil and plunger assembly and un--braze v

T3564--903/114.12.2 Superheat MeasurementNOTEAll readings must be taken from the TXV bulblocation and out of the direct air stream.123451. Suction Lin

T -3564--1003/114 Check oil level in service replacementcompressor. (Refer to paragraphs 1.7 and4.14.4.)23457891011121311. Electric UnloaderValve2. Su

T3564--1103/11g. Notingthe positionofthe wire, removethe three boltsholding the coil to the compressor.h. Remove every other bolt from the seal cover

T -3564--1203/11h. Disconnection of the suction pressure transducer willcause an “A15” alarm. Once the transducer is recon-nected, the alarm will go t

T3564--1303/11Table 4-2. Pressure T ransducer Voltage“/hg Voltage Psig Voltage Psig Voltage Psig Voltage Psig Voltage Psig Voltage20” 0.369 40 0.858 9

T -3564--1403/114.19.2 Routine Examination and Cleaninga. At regular maintenance periods, remove brushcovers and clean and examine motor interior.b. R

T3564--1503/114.20SERVICING THE REHEAT COOLANT VALVEThe reheat coolant valve (RCV) requires nomaintenance unless a malfunction of the internal partsor

T -3564--1603/114.21 LOGIC BOARD REPLACEMENTControl configuration is preset at the factory and resetting of the parameters is not advised. If a replac

i T--35603/11TABLE OF CONTENTSPARAGRAPH NUMBER PageSAFETY SUMMARY Safety--1...GENERAL

T3564--1703/11Table 4-4. R--134a Temperature -- Pressure ChartTemperatureVacuum°F °C“/hg Kg/cm@ Bar-- 40 -- 40 14.6 37.08 0.49.35 .37 12.3 31.25 0.42-

5--1T--35603/11SECTION 5ELECTRICAL5--1 INTRODUCTIONThis section includes electrical wiring schematics covering the models listed in Table 1-1. For app

5--2T--356 03/1198--03319 AFigure 5--1. Wiring Schematic -- Legend -- 68RM35--610 (All)

5--3T--35603/1198--03319 ACONTROL CIRCUIT -- ALL MOTORSFigure 5 --2. Wiring Schematic -- Control Circuit -- 68RM35--610 (All)

5--4T--356 03/11‘98--03319 APOWER CIRCUIT -- PERMANENT MAGNET MOTORSFigure 5--3. Wiring Schematic -- Power Circuit -- 68RM35--610--3, --4, --5

5--5T--35603/11‘98--03319 APOWER CIRCUIT -- WOUND FIELD MOTORSFigure 5 --4. Wiring Schematic -- Power Circuit -- 68RM35--610--1, --2

5--6T--356 03/11‘98--03319 APOWER CIRCUIT -- BRUSHLESS MOTORSFigure 5--5. Wiring Schematic -- Power Circuit -- 68RM35--610, 6, --7, --8, --9

INDEXIndex--1T--35603/11AAir Filter , 4--9Alarm, 2--4, 3--1Alarm Clear , 3--1Alarm Codes, 3--1Alarm Queue, 3--1Ambient Lockout, 1--9BBoost Pump, 2--3C

INDEXIndex--2T -356 03/11PPre--Trip Inspection, 2--2Pressure T ransducer, 1--9, 4--12Pump Down, 4--3, 4--4RRefrigerant Charge, 1--8, 4--3, 4--4, 4--5,

Carrier Transport Air Conditioning50 Grumbacher RoadYork PA 17406 USATel: 1--800--673--2431Fax: 1--717--764--0401A member of the United Technologies C

iiT--35603/11TABLE OF CONTENTS -- ContinuedPARAGRAPH NUMBER Page2.3.6 Compressor Unloader Control 2--3...

iii T--35603/11TABLE OF CONTENTS -- ContinuedPARAGRAPH NUMBER Page4.6 EVACUATION AND DEHYDRATION 4--5...

ivT--35603/11LIST OF ILLUSTRATIONSFIGURE NUMBER PageFigure 1-1. A/C Component Identification 1--1.....

v T--35603/11LIST OF TABLESTABLE NUMBER PageTable 1-1. Model Number Chart 1--2................Table 1