OPERATION AND SERVICE MANUAL Supra 550 650 750 850 & 950

Road KeyThe ROAD key selects the diesel engineoperating mode. The microprocessorretains the last entered setpoint in memoryeven if the unit is shut down or a powerfailure occures.NOTEWhen functional parameter “FN10” is set fortime start, the unit optional auto diesel restart isactive and the Road key will be flashing.Stand-by KeyThe STAND-BY key selects the electricmotor operating mode. The microprocessorretains the last entered setpoint inmemory even if the unit is shut down or a power failureoccures. “NO POWER” will be displayed, if unit isswitched to standby and power is not available.2.3.2 Digital DisplayThe digital display (see Figure 2-1) has nine positions.The default display is setpoint on the left and actualsupply or return air temperature on the right. The readoutmay be set to read in Degrees F or Degrees C.The display also has symbol --type indicators for the followingmodes: Cool, Heat, Defrost, Road (diesel) Operation,Auto Start/Stop mode, Stand-By mode, City Speedmode and Out-Of-Range operation. The indicator is illuminatedto indicate the mode or condition is active.On each power-up, the microprocessor will perform aself test. Errors, if any, will be indicated on the display asan EER.# where “#” is a number corresponding to thenumber of the failed test.ERRORCAUSEERR.1 Processor failureERR.2 Check chip installation or ReplaceERR.3 microprocessor.ERR.4 orDisplayDisplay board to logic board communicationfailure.This can be caused by a defectiveribbon cable or ribbon cable notplugged in properly.2.4 OPERATION2.4.1 Pre-Trip Inspectiona. Pre-Trip Inspection - Before StartingBefore starting engine check the following points:1.Drain water and sediment from fuel tank sump. Thenfill tank with diesel fuel.2.Drain water from fuel filter separator (if applicable).3.Check radiator coolant level. Antifreeze should beadjusted for climate conditions, minimum 50/50 mixture,maximum 60/40 mixture.4.Check condenser/radiator coil for cleanliness.5.Check air cleaner and hoses.6.Check Defrost Air Switch and hoses.7.Check engine oil level.8.Check condition and tension of all belts.9.Check all fan and idler bearings.10.Check door latches and hinges.11. Check condition of condenser fan blades.12.Check battery fluid level (if applicable)13.Check battery cables and terminals14.Check evaporator coil for cleanliness.15.Check evaporator fan16.Check air chute (if applicable)17.Check bulkhead and return air screens (if applicable)18.Check defrost water drains19.Check glow plugsb. Pre-Trip Inspection - StartingStart the unit in continuous run. Refer to Sections 2.4.2or 2.4.4c. Pre-Trip Inspection - After StartingAfter starting engine check the following points:1. Check electric fuel pump.2. Check fuel lines and filters for leaks.3. Check oil lines and filters for leaks.4. Check coolant hoses for leaks.5. Check exhaust system for leaks.6. Check condenser and evaporator fans for proper airflow.7. Initiate Pre-Trip and monitor all operating modes.Check unloader operation (850 and 950).d. After operating unit 15 minutes or more:8. Check water temperature. Should be 160 to 175_F(72to80_C)9. Check refrigerant level. (Refer to section 4.7)10.Check compressor oil level. (Refer to section 4.9)11. Put unit into manual defrost and monitor. Allow unitto terminate defrost automatically.12 Change over to desired operating mode, enter setpoint and change functional parameters as requiredto match the requirements of the load.2--3 62--10828