Truck/Trailer Refrigeration Unit - Sunbelt Transport Refrigeration

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4.6 SERVICING CLUTCH (Trailer)Theclutchmustbeinspectediftheclutchslipsorgrabs. The clutch automatically engages (clutchengagement 550 ¦50 rpm) during starting cycle of theengine as the engine accelerates to low speed. The clutchdoes not engage during standby motor operation.1234a. Remove the two rear compressor bracket mountingbolts (compressor shockmount end).b. Block up engine.56c. Remove clutch V-belts.d. Pump down the unit.e. Remove suction and discharge service valve.f. Attach sling or other device to the compressor.g. Slide compressor enough to remove clutch.h. Remove six (6) 5/16-18 capscrews from rotorassembly (Item 2, Figure 4-9).i. Using three of the capscrews as jacking screws,remove the center section of the clutch housing. This willexpose the snap ring holding the housing to the drive hub.Remove snap ring and housing.8j. After replacing necessary parts, reassemble byreversing above steps.7k. Startunitandcheckoperation.15141213101191. Rotor Plate2. Friction Shoe3. Delta Bridge4. Spring, Leaf5. Screw6. Washer7. Coupling, Adapter8. Housing Assembly9. Housing10. Screw11. Washer12. Ball Bearing Assembly13. Snap Ring14. Retaining Plate15. Snap Ring, ExternalFigure 4-9. Clutch Assembly (Trailer)4-9 62-02884
4.7 PUMPING THE UNIT DOWN ORREMOVING THE REFRIGERANT CHARGENOTETo avoid damage to the earth’s ozone layer, use arefrigerant recovery system whenever removingrefrigerant.a. Pumping the Unit DownTo service the filter-drier, expansion valve, liquid linesolenoid valve, CPR valve or evaporator coil, pump mostof refrigerant into condenser coil and receiver as follows:1. Backseat suction and discharge service valve(turn counterclockwise) to close off gauge connectionand attach manifold gauges to valves.2. Open valves two turns (clockwise). Purge gaugeline.3. Close the receiver outlet (king) valve by turningclockwise. Start unit and run in high speed cooling. PlaceRun-Stop switch in the STOP position when unit reaches0.1 kg/cm@ (1 psig).4. Frontseat (close) suction service valve and therefrigerant will be trapped between the compressorsuction service valve and the manual shutoff (king) valve.5. Before opening up any part of the system, aslight positive pressure should be indicated on thepressure gauge.6. When opening up the refrigerant system, certainparts may frost. Allow the part to warm to ambienttemperature before dismantling. This avoids internalcondensation which puts moisture in the system.7. Open (backseat) king valve and midseat suctionservice valve.8. Leak check connections with a leak detector.(Refer to section 4.8)9. Start the unit in cooling and check fornoncondensibles.10. Check the refrigerant charge. (Refer to section4.10.1)NOTEStore the refrigerant charge in an evacuatedcontainer if the system must be opened betweenthecompressordischargevalveandreceiver.Whenever the system is opened, it must beevacuated and dehydrated. (Refer to section 4.9)b. Removing the Refrigerant ChargeConnect a refrigerant recovery system to the unit toremove refrigerant charge. Refer to instruction providedby the manufacture of the refrigerant recovery system.4.8 REFRIGERANT LEAK CHECKINGIf system was opened and repairs completed, leakcheck the unit.a. The recommended procedure for finding leaks in asystem is with a electronic leak detector for HFC.b. If system is without refrigerant, charge system withrefrigerant to build up pressure between 2.1 to 3.5 kg/cm@(30 to 50 psig). Remove refrigerant cylinder and leakcheck all connections.NOTEIt must be emphasized that only the correctrefrigerant cylinder be connected to pressurizethe system. Any other gas or vapor willcontaminate the system which will requireadditional purging and evacuation of the highside (discharge) of the system.c. Remove refrigerant using a refrigerant recoverysystem and repair any leaks. Evacuate and dehydrate theunit. (Refer to section 4.9) Charge unit with refrigerant.(Refer to section 4.10)4.9 EVACUATION AND DEHYDRATION4.9.1 GeneralMoisture is the deadly enemy of refrigerant systems.Thepresenceofmoistureinarefrigerationsystemcanhave many undesirable effects. The most common arecopper plating, acid sludge formation, “freezing-up” ofmetering devices by free water, and formation of acids,resulting in metal corrosion.4.9.2 Preparationa. Evacuate and dehydrate only after pressure leak test.(Refer to section 4.8)b. Essential tools to properly evacuate and dehydrateany system include a good vacuum pump (5 cfm = 8m#Hvolume displacement, CTD P/N 07-00176-01) and a goodvacuum indicator such as a thermocouple vacuum gauge(vacuum indicator). (Available through RobinairManufacturing, Montpelier, Ohio, Part Number 14010.)NOTEIt is not recommended using a compound gaugebecause of its inherent inaccuracy.c. Keep the ambient temperature above 15.6_C(60_F)to speed evaporation of moisture. If ambienttemperature is lower than 15.6_C (60_F), ice may formbefore moisture removal is complete. Heat lamps oralternate sources of heat may be used to raise systemtemperature.4.9.3 Procedure for Evacuating andDehydrating Systema. Remove refrigerant using a refrigerant recoverysystem.b. There are two methods to evacuate and dehydratethe system with one or two vacuum pumps as shown inFigure 4-10 or Figure 4-11. One is to connect threeevacuation hoses (Do not use standard service hoses, as62-028844-10
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TABLE OF CONTENTS (CONT’D)Section
Page 7 and 8:
LIST OF ILLUSTRATIONSFigurePage4-18
Page 9 and 10:
61 2 3 4 57 811 1091. Muffler2. Eng
Page 11 and 12: 213 4 58 106793 41. Run-Stop Switch
Page 13 and 14: 113214345678910151617111812191. Mai
Page 15 and 16: 1231. Fault Light2. Standby Power L
Page 17 and 18: e. EvaporatorsThe compartments of t
Page 19 and 20: 1.2 ENGINE DATAEngine Model CT4-134
Page 21 and 22: 1.7 SAFETY DEVICESSystem components
Page 23 and 24: 2 3 4 5 6 7 8 9 101FUNCTIONO ISETPO
Page 25 and 26: 1.8.6 FUNCTIONAL PARAMETERSThe func
Page 27 and 28: Engine HoursThe number of diesel en
Page 29 and 30: Coolant Temperature Sensor AlarmThe
Page 31 and 32: g. Minimum On-TimeThe engine is all
Page 33 and 34: 1.12.3 Hot Gas Bypass Unloadera. Ma
Page 35 and 36: 1.14 REFRIGERANT CIRCUIT DURINGCOOL
Page 37 and 38: 1614513LSV31715HGV31614513LSV21715H
Page 39 and 40: 1614513LSV3 (NC)1715HGV3 (NC)161451
Page 41 and 42: 2.2.2 MANUAL STARTINGa. Starting In
Page 43 and 44: 2.6 CONTROL CIRCUIT OPERATION --STA
Page 45 and 46: FALLING TEMPERATURERISING TEMPERATU
Page 47 and 48: 62-028842-8Table 2-3. 3 Compartment
Page 49 and 50: INDICATION/TROUBLEPOSSIBLE CAUSESRE
Page 55 and 56: 4.2 MAINTENANCE SCHEDULE (TRAILER)U
Page 57 and 58: 1105432shaft). Energize solenoid fo
Page 59 and 60: . Electrical Pump (See Figure 4-4)T
Page 61: a. Alternator V-Belts (Trailer Unit
Page 65 and 66: 1. Suction Line2. Equalizer Line3.
Page 67 and 68: k. Slide compressor enough to clear
Page 69 and 70: . Solenoid Coil ReplacementNOTEThe
Page 71 and 72: 4.18.2 Solenoid Valve -- Sporlana.
Page 73 and 74: 4.22 CONFIGURATION OF MICROPROCESSO
Page 75 and 76: 4.25 5KW GENERATOR -- TRAILERThe 5K
Page 77 and 78: 4.27 SERVICING PHASE SEQUENCEWARNIN
Page 79 and 80: 4.30 THERMOSTATIC EXPANSION VALVETh
Page 81 and 82: Table 4-7. R-404A Pressure -- Tempe
Page 83 and 84: 62-028845-2Figure 5-1. Truck Units
Page 85 and 86: 5-4Figure 5-2. Truck Units --- Elec
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Truck/Trailer Refrigeration Unit - Sunbelt Transport Refrigeration

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