carrier supra 422 service manual

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carrier supra 422 service manual

Carrier Transicold Division, Carrier Corporation, P.O. Box 4805, Syracuse, N.Y. 13221 U. S. A. Carrier Transicold E.T.O. Boite Postale Nr. 16 Franqueville --- Saint--- Pierre 76520 Boos, FRANCEPageSwitches and Controls Microprocessor Controller.............................Starting and Stopping Instructions ---Standby Motor Drive.....................Starting and Stopping Instructions --- Standby Motor Drive.....................Pumping The Unit Down or Removing the Refrigerant Charge..................PageChecking and Replacing High Pressure Cutout Switch.........................Adjusting the Compressor Pressure Regulating Valve (CPR). Servicing Defrost Damper Solenoid (DDS) --- Optional.......................PageOil Charge vs. Oil Level Increments (York Compressor)...................Compressor Cylinder Head Unloaded Hot Gas Bypass. Compressor Cylinder Head Loaded Hot Gas Bypass. Temperature Controller Operating Sequence --- Engine Drive. Temperature Controller Operating Sequence --- Standby Operation. Temperature Controller Operating Sequence --- Standby OperationTypical Setup for Testing High Pressure Switch. Thermostatic Expansion Valve Bulb and Thermocouple...................Electrical Schematic Wiring Diagram --- Solid State ControllerElectrical Schematic Wiring Diagram --- Multi-Temp......................PageV-belts caused by the thermostat and theThe control system automaticallyThe Supra models also have an optional Solid StateRefer to section 1.10. A remote standby receptacle is standard with allThis manual contains Operating Data, Electrical. Data and Service Instructions for the truck refrigerationThe Supra models are one piece units designed forThe TDB models have aThe evaporator assembly consists of an evaporatorThe standard control system is a microprocessorTable 1-1. Model Chart. Refrigerant. Model. Supra 422. Supra 522. Supra 622. Supra 722. Supra 822. Supra 922. Supra 644. Supra 744. Supra 844. Supra 944. Supra 944,Engine (Refer toTable 1-1).

Compressor (Refer toTable 1-1). Alternator. Electric Standby Motor. Accumulator. Quench Valve (Not Used on Supra 422)Filter-Drier. Receiver. Hot Gas Valve (Three-Way). Condenser. Compressor Pressure Regulating Valve (CPR). Radiator Overflow Reservoir. Figure 1-1. Condensing Section -- Top View Model 722 ShownFuel Filter. Figure 1-2. Unit Curbside ViewFigure 1-3. Unit Roadside ViewRunning Time Meter (RTM). Temperature Control Module (TCM). Cool Light (CL). Heat Light (HL). Defrost Light (DL). Glow-Defrost Switch (GDS). Start-Run-Stop Switch (SRS). Selector Switch (SSW). Standby Motor Contactor (MC). Motor Overload Relay (MOL). Defrost Timer. Fuse (F1 80 amp). Figure 1-4. Electrical Box -- Solid State ControllerRun-Stop Switch (RS). Note: See Figure 1-7 for Cab Command. Figure 1-5. Electrical Box -- Microprocessor ControllerFigure 1-6. Relay ModuleDisplacementNo. CylindersWeightCoolant CapacityOil CapacityHighSUPRA 622: 2050 rpm. SUPRA 722: 2200 rpm. SUPRA 822: 2300 rpm. LowOperating. Speeds. Injection SettingWater Safety Switch. Oil Pressure Safety. SwitchLube Oil Viscosity: (API Classification CD). Outdoor TemperatureCentigradeDisplacement. No. Cylinders. No. Unloaders. Weight. Oil ChargeOpens at: 38 cm (15 in.) hg vacuumUnit shut down at:Refer to Table 1-1CPR SettingSuniso ESSOBearing Lubrication: Factory lubricated,Horsepower. Operating Amps. Speed. VoltagePower Tray to FrameBearing Lubrication: Factory lubricatedCompressor PulleyType of. Connection. PowerTable 1-3. Table 1-2. Safety Devices -- Microprocessor Controller. Unsafe Conditions. Safety Device. Device SettingOil pressure safety switch (OP)Water temperature sensorFuse (F1)Opens at 80 ampsFuse (F2). Opens at 5 ampsFuse (F3). Opens at 25 ampsFuse (F4). Opens at 15 ampsFuse (F5)Fuse (F7, F8, F9). Opens at 20 ampsHigh pressure cutout switch (HP)Refer to Section 1.4.d. Compressor dischargeShuts unit down aboveTable 1-3. Safety Devices -- Solid State Controller.

Device SettingOil pressure safety switch (OP)Water temperature switchFuse (F1). Opens at 80 ampsSolid State controller. Fuse (F2). Opens at 20 ampsFuse (F3). Opens at 20 ampsFuse (F5, F6, F7). Opens at 20 ampsFuse (F8). Opens at 10 ampsFuse (F9). Opens at 15 ampsHigh pressure cutout switch (HP)Refer to Section 1.4.d.City Speed Key. Road Key. Function Key. ON---OFF Key. Cool Mode. Heat ModeFigure 1-7. Cab CommandThe microprocessor controller is housed in theTable 1-4 for Function Codes and Table 1-5 for Unit Data.Processor. BoardTable 1-6.Refer to section 1.8.8The Cab Command is remote mounted in the truck.The Cab Command includes the LCD display, keypadThe unit shall. Under no circumstances should anyone attemptTransicold dealer for replacement.The Carrier Transicold microprocessor controller. Display board to logic boardERR.4 orThis can be caused by a defective. DisplayThe unit data key is used to display the unitRefer to section 1.8.12City Speed Key. The city speed key enables the city speedThe display will indicate whenArrow Keys. The keypad has up and down arrow keysIf the unit isBuzzer Off Key. The buzzer off key will turn off the cabEnter Key. The enter key is used to accept a change inManual Defrost Key. The manual defrost key is used to initiate aRoad Key. Pretrip Check Key. The pretrip check key is used to initiate aStand-by Key. The stand-by key selects the electric motorThe road key selects the diesel engineEach push of the key will alternate the operating modes. The operating status will be stored in memory and isThe digital display willThe controller always retains theIf no setpoint is in memoryThe setpoint may be changed up or down in wholeThe displayDepressing the enter key will cause the new displayedIf the display is flashingTo start the unit in manual start mode, theFunction Change Key. The function change key is used to displayEach time thisThe default display isDegrees F. (See Figure 1-7).

The display also has symbol indicators for the followingOn each power-up, the unit will display a Display TestThe ability to changeThe functional parameters will control selectedThese parameters can beA description of the functionWith each function changeIf the function key isIf the value is changed, theIf the new value is not entered in 5Each time a key isTo select a differentTable 1-4. Function ParametersThe description messages of the functionalEnglish or Codes through this function selection. The twoThis parameter will not changeRefer to each section for theF or C. Temperature UnitRestartingDefrost Interval. The defrost interval is displayed with the description. DEFR or FN0. The data for the interval is displayed withManual Glow Override. The auto start glow time can be manually overriddenThe messages is displayed as. NORM GLOW or ADD GLOW. If the ADD GLOWEnglish selection. Airflow. The status of the speed control solenoid override isThe code displayMinimum Off-Time. The off-time selection for the auto start mode isThe data for theAlarm Reset. Alarms can be reset through this function. TheCLR. If the ALARM RST is displayed then there is atPressing the enter key will clear allSee section 1.8.7. ThisOn-Time. The on-time selection for the auto start mode isThe data for the on-time isWhen the out-of-range temperature is configured. OFF, the controller indicates out-of-range when theControlling Probe. The number of controlling probes is displayed withThe code display is FN4. The 1-probe setting is “A” and the 2-probe setting is “B.”The data values are displayed for 5The followingIf the enter key is pressed, the display time will be set to 30Standard Units Select. The standard unit select will control how all parametersDEGREES C. This parameter also will control units thatC). The code display is FN5. The selections are “F” or “C.”. Maximum Off Time. The description for the maximum off time is TEMP. STRT OR TIME STRT. The code display is FN6 and theTIME STRT.

With the unit in time start, the control willMOP STD --- Future Expansion. This function is not used at this time. The display isSetpoints may be entered through this function forThe setpoint function will beSuction Pressure. The suction pressure is displayed with theThe data is displayed with theCompartment 3 Setpoint. Setpoints may be entered through this function forThe setpoint function will beEngine Hours. The number of diesel engine hours are displayedThe data is displayedThe selection for starting the unit are displayed. AUTO OP (code FN10 ON) for auto start operation or. MAN OP (code FN10 OFF) for manual start operation. To start the unit in manual start mode, theEngine Temperature. The coolant temperature is displayed with theThe data is displayed with theReturn Air Temperature. The return air temperature is displayed with theThe data is displayed with oneOut-of-Range Tolerance. The out-of-range temperature tolerance selection isWhen the out-of-range temperature is configured. ON, the controller indicates out-of-range when theThis unit data is not used at this time. The CodeTable 1-5. Unit Data CodesEngine Hours. Engine Temperature. Return Air Temperature. Supply Air Temperature. Remote Air Temperature. Ambient Temperature. Future Expansion. Discharge Temperature. Battery Voltage. Standby Hours. Software Revision. Serial Number Low. Serial Number Upper. Compartment 2Compartment 3SAS is displayed whenREM is displayed when the REM Probe Function is selected. Compressor Discharge Temperature. The compressor discharge temperature is displayedThe data is displayedBattery Voltage. The battery voltage is displayed with the description. BATT or CD10. The data is displayed with one decimalStandby Hours. The number of electric motor hours are displayedThe data is displayedMod V --- Future Expansion. This unit data is not used at this time. The CodeSoftware Revision. The Eprom software revision number is displayedPressing theSupply Air Temperature.

The supply air temperature is displayed with theThe data is displayed with oneThis unit data will beSerial Number Low. The low serial number of the unit is displayed withThe data is the lower 3SERL 504 or CD14 504). The upper serial number of the unit is displayed withThe data is the upper 3SERH 001 or CD15 001). The remote air temperature is displayed with theThe data is displayed with oneThis unit data will beCompartment 2 Air Temperature. The air temperature for the second compartmentThe code display is CD16. The dataAmbient Temperature. The ambient temperature is displayed with theThe data is displayed with oneIf the sensor is absent,Compartment 3 Air Temperature. The air temperature for the second compartmentThe code display is CD17. The dataThe maintenance hour meter 1 setting is displayedThe maintenanceIf the hourTable 1-6. Alarm DisplayDefrost OverrideSupply Air Sensor. AL11 WT SENSOR Coolant Temperature. SensorTemperature. AL13 CD SENSOR Discharge Temperature. Sensor. AL14 SBY MOTOR ?Standby Motor OverloadMaintenance Hour Meter 2. The maintenance hour meter 2 setting is displayedSwitch On Hour Meter. The number of switch on hours is displayed with theEach item will be displayed for 3See section 1.8.5 for the procedure on resetting alarms. Low Oil Pressure Alarm. The low oil pressure alarm is displayed with theThis alarm is generated ifEngine willHigh Coolant Temperature Alarm. The high coolant temperature alarm is displayedThis alarm isThe fault light (FL) isHigh Battery Voltage Alarm. The high battery voltage alarm is displayed with theThis alarm is generated ifThe fault light (FL) isHigh Pressure Alarm. The high pressure alarm is displayed with theThis alarm is generated ifThe fault light (FL) isDefrost Override Alarm. The defrost override alarm is displayed with theThis alarm is generated ifStart Failure Alarm.

The start failure alarm is displayed with theThis alarm is generatedThe fault light (FL) is turnedIf function MAN OP (manual start mode) is selectedAlternator Auxiliary Alarm. The alternator auxiliary alarm is displayed with theThis alarm is generated ifLow Battery Voltage Alarm. The low battery voltage alarm is displayed with theThis alarm is generatedThe fault lightStarter Motor Alarm. The starter motor alarm is displayed with theThis alarm is generated ifThe out-of-range alarm is displayed with theThis alarm isReturn Air Sensor Alarm. The return air sensor alarm is displayed with theThis alarm isRemote Compartment 2 Out-of-range Alarm. The Code display is AL21. This alarm is generatedSupply Air Sensor Alarm. The supply air sensor alarm is displayed with theThis alarm isRemote Compartment 3 Out-of-range Alarm. The Code display is AL22. This alarm is generatedCoolant Temperature Sensor Alarm. The coolant temperature sensor alarm is displayedThis alarm isNo Power for Standby AlarmCompressor Discharge Temperature Alarm. The compressor discharge temperature alarm isIf the dischargeIf the defrostCompressor Discharge Temperature Sensor Alarm. The compressor discharge temperature sensor alarmThis alarm is generated if the sensor is open or shorted. Standby Motor Overload Alarm. The standby motor overload alarm is displayed withThis alarm isRelay energized). Fuse Alarm. The fuse alarm is displayed with the description. FUSE BAD or AL15. This alarm is generated when the. FUSE input is sensed low. The fault light (FL) is turnedDisplay Alarm. When no communications exist between the mainThere are two control ranges, Frozen and Perishable. The Frozen range is active with set points at or below. The system is configured for cooling mode for engineHot gas heating is applied by energizing the HR1Maintenance Hour Meter 1 Alarm. The maintenance hour meter alarm 1 is displayedThis alarm isMaintenance Hour Meter 2 Alarm.

The maintenance hour meter alarm 2 is displayedThis alarm isIf the run relay isHeating is locked out of operation at setpointDefault ModeThe proper alarmThe defrost terminates with HR1 and speed relayThe main function ofThe engine coolantA defrost timer initiation is a keypad selectionThe controller holdsAn external defrost signal (DA) may be supplied as aA key is provided to select between continuous run. In the continuousThis function also apply toThe defrost cycle may be initiated by pushing theThe defrost mode is initiated upon expiration of theIt may also beThe timer does notA defrost output is energized during defrost mode toThe compressor operates at maximum capacity onIf the unit fails to start, shuts down on a safety, or failsIn continuous run mode, the engine is started but notWhen the starting conditions are met, the startAfter a period of time, theThe engine will crank for 10 seconds or until engineShould the defrost cycle not complete within 45The glow time for the first start attempt will vary inBefore the next starting sequence, the oil pressureFor the second and third startThe controlEngine Coolant Temperature Glow Time. Temperature. SecondsThe engine is allowed to turn off only after aAfter the minimum on-time, the unit will go to fully. The unit will not cycle off if the engine coolantIf all temperatureThe unit will shut down when the box temperature isChecked at CRANKKeypad provision is provided to select the minimumAfter the minimum off-time, the unit will restart forThe minimum off-time is overridden if theProvisions are made to sense when the battery isIf the battery voltage falls below 10v during glowFigure 1-8. Auto Start SequenceGLOW position, energizes (approximately 7.5 amps perTable 1-7. Battery Voltages. Message. Voltage. Description. Display. LevelThis sensor senses engine water temperature.

TheThe sensor is located nearWhen the oil pressure switch is closed it shows thatComponents required for monitoring andThe water temperatureProvision for a keypad selectable feature is providedThe microprocessor controller is equipped with a. RS232 communication port. This port can be used toThere are presently three (3) protocols supported. The protocol for the QualComm transmitter, theCommunication Protocol. The microprocessor willWhen illuminated indicated unit in either high or lowWhen illuminated indicates unit is in defrost modeWhen illuminated indicated unit in either high or lowThese meters designates the total hours and providesSection 4.1.)Components required for monitoring andThe water temperatureThe glow plugs are locatedWhen starting engine, it isWhen placed in the RUN position, this switchThe CPR valveCPR settings refer to section 1.4. The suction pressure is controlled to avoidTo adjust the CPR valve, refer toThis switch is a three position switch, which are. START(momentary contact), RUN and STOP. With theSTOP position.This switch is used to select mode of operation,With the solenoid coil de-energized the valve is in theThis difference inOperation of the hot gas (three-way) valve is governedThe solid state defrost timer is an optional method ofA second jumper shunt located on the timer is used toThe two designations forThe function of the motor overload is to protect theIn this application the settingWhen the hot gas solenoid coil is energized,Reverse polarity will destroy the rectifier diodesConnecting charger inThe pressure on both sides of theIn both the energized andThe alternating current andFigure 1-13)The regulator is an all-electronic, transistorizedThe electronic circuitry should never require adjustmentThe system isFigure 1-10. Hot Gas Valve -- Heat and Defrost. FlowThis is accomplished by the compressor drawing theThis orificeThe regulator is an electronic switching device. ItThe output current is determined by the load.

YellowTerminal (L)When cooling, the unit operates as a vaporThe main components ofThe compressor raises the pressure and temperatureThe condenser fan circulates surrounding air over theHeat transfer is thusThe receiver stores the additional charge necessary forThe refrigerant leaves the receiver and flows throughThe refrigerant then flows through a filter-drierThe compressor draws this vapor out of theThis orifice prevents theThe vapor refrigerant then enters the compressorThe quench valve (not used on Supra 422 or R-404AWhen refrigerant vapor is compressed to a highWhen the controller calls for heating or defrost, theThe main difference between heating and defrostingThe function of the bypass line from the hot gas valveThe quench valve (not used on Supra 422 or R-404AIn R-404A units the refrigerant flows to the. Here the liquid isThe liquid then flows to an externally equalizedThe evaporator tubes have aluminum fins to increaseThis cold air isThe transfer of heat from the air to the lowIn R-22 units this low temperature, low pressureIn R-404A units this low temperature, low pressureExpansion Valve Bulb. Evaporator. External Equalizer Line. Expansion Valve. Filter-Drier. Receiver (King) Valve. Receiver Sight GlassRegulating Valve (CPR)Solid State Control (ETO) OnlySupra 422)Figure 1-14. R-22 Refrigeration CircuitExpansion Valve Bulb. ReceiverRegulating Valve (CPR)Figure 1-15. R-404A Refrigeration CircuitDuring perishable cooling the unloader is energizedThe 05G compressor is equipped with an unloaderThe capacity controlled cylinders are easilyDiesel. During perishable heating the front unloader isNote: These switch points may vary slightlyStandby. During perishable heating the unloader is energizedThere are two modes of unloader operation,Table 1-8. Diesel. During frozen mode, heating is not allowed. TheThe unloader will stay energized until the controlCylinder. Table 1-8. Unloading in Temperature ModeCool Low Speed. Heat Low Speed.

Heat High SpeedDuring frozen mode, heating is not allowed. TheThe unloader will stay energized until the control. Cool High SpeedCool Low SpeedEngine. The microprocessor will monitor suction pressure ofDiesel. During perishable cooling the unloader is energizedIf a supplyIf a supply probe is notR-22 Refrigeration System. When the system is operating at high speed and theWhen the system is operating at low speed and theMotor. The microprocessor will monitor suction pressure ofWhen the system is operating and the suctionWhen the system is operating at high speed and theWhen the system is operating at low speed and theWhen the system is operating and the suctionDischarge pressure bleeds from the dischargePressure from the discharge manifold (Figure 1-16,Unless bledRefrigerant pressure will overcome the bypass valveWith the solenoid valve (1) de-energized the solenoidCylinder discharge pressure will force open theRefrigerantWith the solenoid valve (1) energized the solenoidRefrigerant pressure will be bled to the suctionThe loaded cylinder bank will continue to operateValveValveCheck Valve. AssemblyFigure 1-17. Compressor Cylinder Head Loaded. Hot Gas BypassValveValveCheck Valve. AssemblyFigure 1-16. Compressor Cylinder Head Unloaded. Hot Gas BypassThen fill tank with diesel fuel.ETHYLENE GLYCOL ONLY. (Refer to section 1.2)Whenever starting the engine, in order to reduceAfter first 15 seconds the microprocessor willThe microprocessor willArrow Key and then the Enter Key. Check engine speed. (Refer to section 4.2.3)Place the On-Off Switch (Cab Command) to OFFThese locations have alsoThe controller boards shown on the electricalIf AUTO OP appears:OP appear on the display. Connections to these boards are made through 3The unit is in MANUAL. START mode.START mode. The processor board connections are mainly inputsStart Continuous Run. The relay module, which contains plug-inThere are two control ranges, Frozen and Perishable. Table 2-1. Manual Glow Time. Glow Time in.

SecondsIf the unit is in high speed cool, the microprocessorThe engine will be in highPlace the On-Off Switch (Cab Command) to OFFWhen the unit is running in high speed cool and withThe operator now may verify the pre-trip sequence.The microprocessorAs the box temperature falls toward set point, theThe speed relay (SR) de-energizes to open the circuitEngine speedTo do this, theUnit will remain in various stages of heating until theWhen the defrost air switch contacts close, there is aThe microprocessor looks for voltage at terminal K2. Voltage at K2 indicates that at least one defrostThe unit will shift to theRefer to section 1.16 for description on heating cycle. The unit will only heat when the controller is setIf both defrost thermostats (klixons) are open (noIn defrost the microprocessor pulls terminals X1 and. N3 low to shift the unit into high speed heat. TheThe controller automatically selects the modeAlso N.C. defrost relay contacts open to to stop theThe controller will shift the unit into low speedW3 low to energize damper relay (DPR). This closes. N.O. damper relay contacts to energize (close) defrostWhen the unloader front relay (UFR) energizes, aCompressor will be in 4The unit will remain in defrost until both defrostIf more heating capacity is required, the unit will shiftThe microprocessor energizes the. HR1, and speed relay (SR) coils. Terminals X1 and N3The engine will be in high speed. If the problem corrects itself, (thermostats opens forThe microprocessor will break the ground path toThe defrost termination starts with HR1 and speedRefer to sections 1.8.10 and 1.16 for the heat andThe defrost mode may be initiated by three differentMethod one to initiate defrost is by pressing the. Manual Defrost Key.

Method two is that defrost may be initiatedAir temperature in theThese locations have alsoWhen in Continuous Run, perishable range, theIn frozen range theContinuous Run isFirst the microprocessor will energize (ARR), thisAuto Restart Light (ARL) on the light bar, indicating toAfter a 5 second delay the. Diesel Electric Relay (DER) will be energized, this willRelay (FHR), Fuel Pump (FP) and the Fuel SolenoidContactor (MC). With the motor contactor energized,Motor(SBM) off to conserve energy. The microprocessorAt the same time, (RR) will be energized, closing the. N.O. (RR) contacts supplying voltage to the refrigerationAfter the minimum run time is complete, theWhen the unit is “OFF,” the microprocessor keepsIf after 5 minutes, the batteryA) Battery condition --- Battery voltage must beB) The box temperature (active probe) must beIf ALL of these conditions are not satisfied, theThis preventsStandby defrost operates the same as engine driveModeUnloaded. Off CycleUnloaded. DefrostThis may be overridden by suction pressure.Then fill tank with diesel fuel.UP position until the engine develops sufficientETHYLENE GLYCOL ONLY. (Refer to section 1.2)UP position until the oil pressure safety switch closesTable 3-1. Manual Glow Time. Ambient TemperatureGlow Time inPlace Start-Run-Stop switch in the STOP position. Starting InstructionsV-belts caused by thermostatic cycling of unitStarting InstructionsRefer to section 1.16 for description on heating cycle. STANDBY position.The unit will only heat when the controller is set aboveRUN position. The controller automatically selects the modeHeatingCondenser airTo reverse rotation, stop unit,The heat light will also be illuminated. The controllerFigure 3-3)If more heating capacity is required, the unit will shiftRefer to section 1.16 for the heat and defrost cycle.These locations have alsoThe defrost mode may be initiated by three differentMethod one to initiate defrost is to place the.

The relay module, which contains plug-inMethod two is that defrost may be initiatedThe third means of defrost initiation is by the defrostThere are two control ranges, Frozen and Perishable. The controller automatically selects the modeIn defrost the controller will shift the unit into highIf the unit is in high speed cool, the controller willA set of normally closedAlso N.C. defrost relay contacts open to stop theThe unit will remain in defrost until one defrostAs the box temperature falls toward set point, theFigure 3-1, Figure 3-2, Figure 3-3 or Figure 3-4). The speed relay (SR) energizes to open the circuit toEngine speedUnit will remain in various stages of heating until theHeat Relay (HR) contacts energizing the Cool LightRelay (DTR) terminal (DTR-86), N.O. (DTR) contacts,Voltage will alsoStandby Cool, Standby OFF, Standby Heat. With (MC) energized, the N.O. (MC) contacts close,When (SBM) is turning fast enough to cause the. Alternator (ALT) to charge the system, the (RALT) willDuring Standby operation, there are three operatingOFF. (TCM calling for low speed cool.) When the boxWhen the unit is running on Standby the (TCM) willThis will cycleStandby Cool, Standby Off. When in the frozen range of operation, the unit willThe HEAT output from theWhen (MCP) is de-energized, the N.O. (MCP)Motor.This schematic shows the unit in the standby coolWith (RR) de-energized, the N.O. (RR) contacts willThe (TCM) will remain energized from terminalLooking at the (SRS), potential will be present atAlso voltage willTemperature Control Module (TCM). At the same time,Relay (SBR) contacts, N.C. Oil Pressure Safety switchThis is controlledStandby defrost operates the same as engine driveWhen (RR) energizes, the N.O. (RR) contacts close,Looking back to the N.O. (RR) contacts (energizedOffLow Speed CoolingOff CycleHigh Speed HeatingDefrostI or O I or OBefore servicing unit,Also disconnect the negative battery cable.

Pre-Trip Inspection --- after startingCheck engine speedsBypass Oil FilterBypass Oil FilterSolenoidsThe condenser and radiator assembly is designed withRemove clip (itemRemove mounting hardwareConnect the ground wireThe condenser and radiator can be cleaned at theSlide the solenoid far enoughNever exceed moreIf the engine does notRinse coil with fresh water if a detergent is used.Refill system with water.Control)Figure 4-1. Speed and Run Control SolenoidsDrain systemINTO A HOT ENGINE, however hot water can alwaysAfter warming up the engine, stop engine, removeDisconnect linkageRemove mounting hardwareInstall the replacementConnect theReplace filter(s), lightly oil gasket on filter beforeSlide the solenoid far enoughDump the oil from the oil cups. Remove the inner cup from the oil cup and clean.It is generallyThe engine is in low speed. Refer to section 1.2 for engineRepeat procedure if adjustments need to be made.Energize solenoid for maximum force (pull) and thenWhen to Service: The lower portion of the fixedIf there is any sign of contaminantAt least once a year or atThe oil type air cleaner, hose and connections shouldA damaged air cleaner or hose canWhen inspecting air cleaner housing and hoses, checkWhen leakageSwelled or distortedInstall new air filter.The air cleaner is designed to effectively removeAn excessive accumulation of these contaminants in theWhen to Service: Remove the oil cup at regularHeavily contaminatedFigure 4-2. Electric Fuel PumpThe glow plugs, when energized, draw a nominal 7.0Standby. MotorChecking for a Defective Glow PlugSupra 422 With Evaporator MotorsThe reading shouldMotor. EngineIt is recommended using a belt tension gauge (tester)A belt tension gauge provides an accurate and easySupra 522 to 822 With Evaporator MotorsFigure 4-3. V-Belt Arrangement. The belt tension gauge can be used to adjust all belts.