Carrier operating and Service Manual

Transport Air ConditioningT--336 05/09OPERATION AND SERVICEforEM--17Large Split SystemsDC12174 & DC12175

T--3361--305/091.2 SYSTEM OPERATING CONTROLS ANDCOMPONENTS1 Electronic Thermostat (TH)The system is equipped with an electronicthermostat which operat

T--3361--4 05/09SOCKETFigure 1--3 Relay Board1.4 REFRIGERANT SYSTEM COMPONENTSPECIFICATIONSa. Refrigeration ChargeApproximate R134a refrigerant charge

T--3361--505/091.5 SAFETY DEVICESSystem components are protected from damagecaused by unsafe operating conditions with safetydevices listed in Table 1

T--3361--6 05/091.9 SAFETY DEVICESSystem components are protected from damagecaused by unsafe operating conditions with safetydevices.Safetydeviceswit

T--3361--705/09111234567891011121314EM--17 EVAPORATORCM--5 CONDENSERUPS1UPS2CFS1UPS3CFS21 Compressor2 Discharge Line3 Discharge Line Check Valve4 Cond

T--3361--8 05/09CONDENSERKR--4EM--17 EVAPORATOR131212, 34567891011141516UPS3CFS1CFS2UPS2UPS117, 181. Compressor2. Discharge Service Port3. High Pressu

T--3362--105/09SECTION 2OPERATION2.1 STARTING ANDSTOPPING INSTRUCTIONS2.1.1 Startinga. Start the vehicle engine. The evaporator (interior)fans will st

T--3362--205/09a. Temperature ControlThe unloaders are operaed as follows for temperaturecontrol:1 CompressorUnloaderUV1.Whenreturnairtemper-ature fal

T--3362--305/09Once the temperature approaches set point, thethermostat will call for the system to unload. With thethermostat calling for unloading,

T -3363--105/09SECTION 3TROUBLESHOOTINGTable 3-1 General System Troubleshooting ProceduresINDICATION/TROUBLEPOSSIBLE CAUSESREFERENCESECTION3.1 System

OPERATION & SERVICEMANUALMODELEM--17Large Split SystemDC12174DC12175BUSAIR CONDITIONINGEQUIPMENT

3--2T--33605/09Table 3-1 General System Troubleshooting Procedures - ContinuedINDICATION/TROUBLEPOSSIBLE CAUSESREFERENCESECTION3.4 Abnormal Noise Or V

T -3364--105/09SECTION 4SERVICEWARNINGBesureto observe warningslisted in thesafety summary in thefrontof thismanual beforeperform-ing maintenance on t

T -336 4--205/09backseated positions, the suction or discharge gaugeport is open to both the compressor and the line.SERVICEPORT (R-22)VALVE STEM CAPV

T -3364--305/09Opened(Backseated )Hand ValveClosed(Frontseated)Hand ValveTo Low SideAccess ValveTo High SideAccess Valve(Red Knob)(Blue Knob)143YELLOW

T -336 4--405/0921. Filter-Drier OutletService Valve2. Manifold GaugeSet3. Filter-Drier4. Filter-Drier InletService Valve5. Thermistor VacuumGauge6. V

T -3364--505/09g. Oncevacuumismaintained,re-connect lowpressureswitch.Backseatcompressor servicevalves anddis-connect manifold gauge set.h. Check refr

T -336 4--605/09f. Break the vacuum with nitrogen. Raise system pres-sure to approximately 2 psig.g. Purge the nitrogen from the system.h. Repeat step

T -3364--705/094.7 ADDING REFRIGERANT TO SYSTEM4.7.1 Checking Refrigerant ChargeThe following conditions must be met to accuratelycheck the refrigeran

T -336 4--805/091. Cylinder Valve and Gauge2. Pressure Regulator3. Nitrogen Cylinder4. Pressure Gauge (0 to 400 psig = 0 to27.22 bar)5. Bleed-Off Valv

T -3364--905/09WARNINGThe filter-drier may contain liquid refriger-ant. Slowly loosen theflarenutsto avoidre-frigerant contact with exposedskin oreyes

iT -30805/09TABLE OF CONTENTSSection Page...SAFETY SUMMARY Safety--1...

T -336 4--1005/091. Power HeadAssembly2. Equalizer Connection3. Bulb4. Gasket5. Cage Assembly6. Body Flange7. Cap screw12345674Figure 4--12 Thermostat

T -3364--1105/09filter will restrict air flow over the evaporator coil whichmay cause insufficient cooling or heating and possiblefrost buildup on the

T -336 4--1205/09atecompressorto500microns.Front seat bothman-ifold valves to isolate the pump.m.Open compressor service valves.n. Start unit and chec

T -3364--1305/09WARNINGExtreme care must be taken to ensure thatall the refrigerant has been removed fromthe compressor crankcase or the resultantpres

T -336 4--1405/094.17 REPLACING SENSORSa. Place mainbattery disconnect switch in OFFpositionand lock.b. Tag and disconnect wiring from defective senso

T -3364--1505/09Table 4--2 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 0.42-30 -

T--3365--105/09SECTION 5ELECTRICAL5--1 INTRODUCTIONThis section contains electrical wiring schematics covering the models listed in Table 1--1. The sc

T--3365--2 05/09SYMBOL DESCRIPTIONACMS A/C MODE SWITCHACR A/C RELAYACSL A/C STOP LIGHTACSR1 A/C STOP RELAY #1 (TIME DELAYED)ACSR2 A/C STOP RELAY #2 (T

T--3365--305/09Reference 98--62158/98--62678F8 AND CF3 ONDC12175 ONLYOPEN P--RISE 360 + /-- 10CLOSE P--DROP 285 +/-- 15OPEN P--DROP 6 +/-- 3CLOSE P--R

T--3365--4 05/09Reference 98--62158/98--62678Figure 5--2 Schematic(Sheet 3 of 3)

iiT -30805/09TABLE OF CONTENTS -- Continued:4.4 PUMPING THE SYSTEM DOWN OR REMOVING THE REFRIGERANT CHARGE 4--3...4.4.1 System Pump Down For Low Si

INDEXIndex 1T--33605/09AAir Filter, 4--10Ambient Lockout, 1--6CClutch, 2--2, 4--12Compressor, 4--11Condenser Fan, 2--2Cooling Mode, 2--1DDESCRIPTION,

INDEXIndex 2T--336 05/09TTemperature Control, 2--1, 2--2Temperature Pressure Chart, 4--15Temperature Sensor , 1--5, 4--13, 4--14Thermostatic Expansion

©2009 Carrier Corporation D Posted in U. S. A. 0509Carrier Transport Air Conditioning50 Grumbacher RoadYork PA 17406 USATel: 1--800--673--2431Fax: 1--

iiiT -30805/09LIST OF ILLUSTRATIONSFigure Page...Figure 1--1 Coach Cutaw

Safety-- 1T--33605/09SAFETY SUMMARYGENERAL SAFETY NOTICESThe following general safety notices supplement the specific warnings and cautions appearing

Safety-- 2T--33605/09SAFETY SUMMARYSPECIFIC WARNINGS AND CAUTIONSWARNINGBesureto observe warningslisted in thesafety summary in thefrontof thismanual

T--3361--105/09SECTION 1DESCRIPTION1.1 INTRODUCTIONThis manual contains Operating Instructions, ServiceInstructions andElectrical Data for the Model D

T--3361--2 05/09123456Figure 1--1 Coach Cutaway View1Drivers Control2CM--5 Condenser (DC12175)3KR--4 Rooftop Condenser (DC12174)4EM--17 Evaporator Ass