Carrier 68RF50 Neoplan-LA Service Manual

T- 271Bus AirConditioningUnitModel68RF50NEOPLAN-LA

1-51.2 REFRIGERATION SYSTEM COMPONENTSPECIFICATIONSa. Refrigeration ChargeR-134a:16lb.(7.3 kg)b. CompressorModel: 05GNo. of Cylinder: 6Weight (Dry): 1

1-61.3 ELECTRICAL SPECIFICATIONSa. Evaporator Blower MotorEvaporator MotorBrushlessBearing LubricationFactory Lubri-cated (addi-tional greasenot requi

1-71.5 SYSTEM OPERATING CONTROLS ANDCOMPONENTSa. Temperature Controller (Thermostat)The Temperature Controller is a thermostat thatsenses and controls

1-8Clutch Relay (CR)The Clutch Relay (CR) is located in the electricalcontrol panel. When the CR relay is energized, a set ofinternal contacts will cl

1-91.6 REHEAT COOLANT VALVEThe Reheat Coolant Valve (RCV) i s located in theevaporatorsectionoftheunitontheroofofthebus.(SeeFigure1-1.)Thevalveisanele

1-101.10 REFRIGERATION FLO W CYCLEFigure 1-6. Refrigeration Cycle Diagram1234567 89111213141618192010151. Evaporator Coils2. Inline Sight Glass3. Low

2-1SECTION 2OPERATION2.1 ST ARTING AND STOPPING INSTRUCTIONSa. Starting1. Start the vehicle engine.2. Switch the driver’s A/C Switch (ACS) to thedesir

2-2Speed Relay (CSR) opens a set of normally closedcontacts toswitchtolowspeedcondenserfanoperation.At this point, the thermostat also applies power t

2-32.3.3 Heat Operation (See Figure 2-3.)Thedriver’sA/CSwitch(ACS)isplacedintheHEATposition to activate the heatingcycle. With this switchinthe HEAT p

2-4Figure 2-4. Cooling Cycle---High Speed Vent Mode OperationEnergized CircuitDe-energized Circuit

OPERATION ANDSERVICE MANUALCarrier Transicold Division, Carrier Corporation, P.O. Box 4805, Syracuse, N.Y. 13221Carrier Corporation 1996 D Printed in

2-5Figure 2-5. High Speed Unloaded (2-cylinder operation) Cool Mode OperationEnergized CircuitDe-energized Circuit

2-6Figure 2-6. High Speed Semi-Loaded (4-cylinder operation) Cool Mode OperationEnergized CircuitDe-energized Circuit

2-7Figure 2-7. High Speed Fully Loaded (6-cylinder operation) Cool Mode OperationEnergized CircuitDe-energized Circuit

2-8Figure 2-8. High Speed Unloaded (2-cylinder operation) Cool with Reheat Mode OperationEnergized CircuitDe-energized Circuit

2 --- 9/2 --- 10Figure 2-9. Heating Cycle --- Low Speed Heat Mode OperationEnergized CircuitDe-energized Circuit

SECTION 3TROUBLESHOOTING3-1INDICATION/ REFERENCETROUBLE POSSIBLE CAUSES SECTION3.1 UNIT WILL NOT COOLCompressor will not run V-Belt broke or defecti v

INDICATION/ REFERENCETROUBLE POSSIBLE CAUSES SECTION3-23.3 ABNORMAL PRESSURE CONT’DLow suction pressure Suction service valve partially closed OpenFil

3 --- 3/3 --- 43.6 NO EVAPORATOR AIR FLOW OR RESTRICTED AIR FLOWNo evaporator air flow Motor burnout 4.18Fan damage 4.18Return air filter dirty Check/

4-1SECTION 4SERVICEWARNINGBEWARE OF ROTATING FAN BLADES ANDUNANNOUNCED STARTING OF FANS.4.1 MAINTENANCE SCHEDULEUNITOPERATIONREFERENCEON OFFOPERATIONR

4-2hoses are common with the center hose as well as eachother.Whenthe lowandhigh sidevalvesarefrontseated(closed), the high and low side hoses are iso

iTABLE OF CONTENTSSection Page1 DESCRIPTION 1-1...1.1 Introduction 1-1...

4-3To remove the refrigerant charge:a. Install a manifold gauge set as outlined insection 4. 3.b. Connect evacuated refrigerant cylinder to theliquid

4-45. Evacuation Manifold --- A evacuationmanifoldisrecommended for connecting the equipment needed fora proper evacuation. The evacuation manifold ca

4-51234 5671. Condenser Coils2. Filter-Drier Outlet Service Valve3. Filter-Drier4. Filter-Drier Inlet Service Valve5. Receiver6. Thermostatic Expansio

4-64.10 FILTER-DRIER REMOVALIfthesightglassonthereceiverappearstobeflashingor ex cessive bubbles are constantly moving through thesight glass, the uni

4-7WARNINGDo not use a nitrogen cylinder without apressureregulator.Cylinderpressure isapprox-imately2350psi(165kg/cm@).Donotuseoxygeninorneararefrige

4-87. Note the temperature of the suction gas at t hesensor bulb.8. Subtract the saturation temperature determinedinStep6fromtheaveragetemperaturemeas

4-94.15 SERVICING THE REHEAT COOLANT VALVEThe coolant valve requires no maintenance unless amalfunction to the internalpartsor coiloccurs. Thismaybe c

4-104.16 SERVICING THE LIQUID LINE SOLENOIDVALVEThe Liquid line solenoid valve is very similar to thecoolant valve. It requires no maintenance unless

4-114.18 SERVICING THE EVAPORATOR FANBLOWER MOTOR ASSEMBLYa. Removing and Disassembling1. Place run control switch to the OFF position.2. Disconnect t

4-12b. InstallingNOTES1. It is important to check the compressor oillevelof the new compressor and fillifnecessary.2. The service replacement compress

iiTA BLE OF CONTENTS (CONT’D)Section Page4 SERVICE (CONT’D) 4-1...4.17 Removing the Conde nser Fan M

4-136. Backseat valve t o remove hose f rom suctionservice valve and replace service valve caps.GaugeManifoldCompressorOilContainerSuctionServiceValve

4-14Table 4-2. R-134a Temperature---Pressure ChartBOLD NO. = Inches Mercury Vacuum (cm Hg Vac)TemperaturePressure Temperature Pressure_F _C Psig Kg/cm

5-1SECTION 5ELECTRICAL5.1 INTRODUCTIONThis section includes electrical wiring schematics for model 68RF50 for NEOPLAN-LA. The schematic shown inthis s

5-2Figure 5-1. Electric al Wiring Schemat ic Diagram (68RF50 with Rotron Brushless Motors),Dwg. No. C-070-935, Rev C (Sheet 1 of 2)

5 --- 3/5 --- 4Figure 5-1. Electrical Wiring Schematic Diagram (68RF50 with Rotron BrushlessMotors),Dwg. No. C-070-935, Rev C (Sheet 2 of 2)

iii/ivLIST OF TABLESTable Page1-1 Model Chart 1-1...1-2 Additional Support Manuals 1-1...

1-1SECTION 1DESCRIPTION1.1 INTRODUCTIONThismanualcontainsoperatingdata,electricaldata,and service instructions for the 68RF50 NEOPLAN-LAair conditioni

1-21234567891011181213141516171. Liquid Line Solenoid Valve2. Thermal Expansion Valves3. Hot Water Valve4. Condenser Fan Switch5. Evaporator Blower6.

1-31. Receiver2. Fusible Plug3. Condenser Coil4. Condenser Fan and Motor5. DischargeLineValve6. Discharge Check Valve7. Ambient Air Switch8. Filter-Dr

1-41. Booster Pump Relay (BPR)2. A/C Relay (ACR)3. Heat Relay (HR)4. Heat Relay #2 (HR2)5. Fault Relay (FR)6. Clutch Relay (CR)7. Terminal Block “C” (