PREVOST X3-45 COMMUTER User Manual

SECTION 22: HEATING AND AIR CONDITIONING
DOB 1300-1556 | X3-45 Commuter PA-1648 Maintenance Manual First release Oct 2020
1
CONTENTS
SECTION CHANGE LOG ....................................................................................................................................... 3
1. TORQUE TABLES ......................................................................................................................................... 4
1.1 HIGH CAPACITY COMPRESSOR (CENTRAL HVAC SYSTEM) ............................................................................. 4
1.2 HIGH/LOW PRESSURE SERVICE AND RECEIVER TANK VALVES ...................................................................... 5
1.3 IDLERS & TENSIONERS ................................................................................................................................... 5
2. HVAC SYSTEM OVERVIEW ........................................................................................................................... 6
2.1 CENTRAL HVAC SYSTEM EVAPORATOR COMPARTMENT ARRANGEMENT ................................................... 6
2.2 CENTRAL HVAC SYSTEM ................................................................................................................................. 7
3. HVAC SYSTEM BASIC MAINTENANCE .......................................................................................................... 9
3.1 COIL CLEANING .............................................................................................................................................. 9
3.1.1 Driver’s Unit ........................................................................................................................................... 9
3.1.2 Passenger’s Unit .................................................................................................................................... 9
3.2 DRIVER’S UNIT AIR FILTER ............................................................................................................................ 10
3.3 PASSENGER’S UNIT AIR FILTER .................................................................................................................... 10
3.4 EVAPORATOR DOOR FRESH AIR INTAKE FILTER .......................................................................................... 11
3.5 OVERHEAD COMPARTMENT FAN AIR FILTER .............................................................................................. 11
3.6 COMPRESSOR BELTS .................................................................................................................................... 12
3.6.1 Belt Replacement – Central System ..................................................................................................... 12
3.6.2 Belt Tension Adjustment – Central System .......................................................................................... 12
3.7 TORCH BRAZING .......................................................................................................................................... 13
3.8 SOLDERING .................................................................................................................................................. 13
4. HVAC SYSTEM COMPONENTS .................................................................................................................... 14
4.1 COMPRESSOR – CENTRAL A/C SYSTEM ....................................................................................................... 14
4.1.1 Suction and Discharge Hose Connection .............................................................................................. 14
4.1.2 Electro-Magnetic Clutch ....................................................................................................................... 14
4.1.3 Maintenance - Shaft Seal Oil Collecting tube Drain ............................................................................. 14
4.1.4 Maintenance - Oil Color & Level Check ................................................................................................ 15
4.1.5 Maintenance - Compressor oil Change ................................................................................................ 16
4.1.6 Troubleshooting Guide ......................................................................................................................... 17
4.2 BRUSHLESS EVAPORATOR MOTOR .............................................................................................................. 18
4.2.1 Removal ............................................................................................................................................... 18
4.2.2 Installation ........................................................................................................................................... 19
4.3 CONDENSER (CENTRAL A/C) ........................................................................................................................ 20
4.3.1 Condenser Fan Control ......................................................................................................................... 20
4.3.2 Condenser Fan Removal ....................................................................................................................... 21
4.4 RECEIVER TANK ............................................................................................................................................ 21
4.5 FILTER DRYER ............................................................................................................................................... 22
4.5.1 Replacement of the Filter-Dryer After Pumping Down ........................................................................ 22
4.6 MOISTURE INDICATOR ................................................................................................................................. 23
4.7 SHUTOFF VALVE WITH SERVICE PORT ......................................................................................................... 23
4.8 LIQUID REFRIGERANT SOLENOID VALVE ..................................................................................................... 24
4.8.1 Typical malfunctions ............................................................................................................................ 24
4.8.2 Electrical Bypass/On Demand Opening of liquid refrigerant solenoid valves ...................................... 25
4.8.3 Coil Replacement ................................................................................................................................. 25
4.8.4 Valve Disassembly ................................................................................................................................ 25
4.8.5 Valve Reassembly ................................................................................................................................ 25
4.9 THERMOSTATIC EXPANSION VALVE ............................................................................................................ 26

PREVOST X3-45 COMMUTER Specifications

General

Engine	Volvo D13
Transmission	Allison B500
Fuel Type	Diesel
Length	45 ft (13.7 m)
Width	102 in (2.6 m)
Horsepower	500 hp
GVWR	54, 000 lbs
Height	141 in