PREVOST X3-45 Multiplex - Page 1143

SECTION 22: HEATING AND AIR CONDITIONING
PA1562
1
CONTENTS
1. HEATING AND AIR CONDITIONING...................................................................................................4
2. AIR CIRCULATION...............................................................................................................................4
2.1 DRIVER’S AREA.................................................................................................................................4
2.2 PASSENGERS’ AREA..........................................................................................................................4
3. CENTRAL HVAC SYSTEM OPERATION............................................................................................5
3.1 DRIVER’S SECTION OPERATION .........................................................................................................5
3.2 PASSENGERS’ SECTION OPERATION ..................................................................................................6
3.3 OVERHEAD COMPARTMENT A/C ........................................................................................................7
4. HVAC UNIT MAINTENANCE................................................................................................................7
4.1 COIL CLEANING.................................................................................................................................7
4.2 DRIVER'S SECTION AIR FILTERS ........................................................................................................8
4.3 PASSENGERS’ SECTION AIR FILTER ...................................................................................................8
4.4 OVERHEAD COMPARTMENT FAN AIR FILTER.......................................................................................9
5. HVAC SYSTEM PARTICULARITIES, TESTING AND TROUBLESHOOTING...................................9
5.1 HVAC SYSTEM AND TEST MODE FOR SWITCHES AND SENSORS .........................................................9
5.2 HVAC SYSTEM AND TEST MODE FOR ELECTRIC MOTORS .................................................................10
5.3 PARTICULARITIES............................................................................................................................10
5.4 HVAC SYSTEM TROUBLESHOOTING..................................................................................................11
6. CENTRAL AIR CONDITIONING SYSTEM.........................................................................................12
6.1 A/C CYCLE .....................................................................................................................................12
6.2 REFRIGERANT.................................................................................................................................13
6.2.1 Procurement..........................................................................................................................13
6.2.2 Precautions in Handling Refrigerant .....................................................................................13
6.2.3 Treatment in Case of Injury...................................................................................................13
6.2.4 Precautions in Handling Refrigerant Lines............................................................................15
6.2.5 Auxiliary System Refrigerant Lines .......................................................................................15
6.3 PUMPING DOWN .............................................................................................................................15
6.4 ADDING REFRIGERANT (VAPOR STATE)............................................................................................16
6.5 EVACUATING SYSTEM .....................................................................................................................16
6.5.1 Double Sweep Evacuation Procedure ..................................................................................17
6.6 CHARGING SYSTEM.........................................................................................................................18
6.7 REFRIGERANT SYSTEM CLEAN-OUT AFTER COMPRESSOR FAILURE...................................................18
6.7.1 Determining Severity of Failure.............................................................................................19
6.7.2 Clean-out after Minor Compressor Failure............................................................................19
6.7.3 Clean-out After Major Compressor Failure ...........................................................................19
7. CENTRAL A/C SYSTEM COMPONENTS..........................................................................................19
7.1 COMPRESSOR (CENTRAL SYSTEM) ..................................................................................................19
7.1.1 Belt Replacement..................................................................................................................19
7.1.2 Belt Play ................................................................................................................................20
7.1.3 Pulley Alignment....................................................................................................................21
7.1.4 Longitudinal Compressor Alignment .....................................................................................21
7.1.5 Horizontal Compressor Alignment ........................................................................................21
7.1.6 Vertical Compressor Alignment.............................................................................................21
7.1.7 Compressor Maintenance.....................................................................................................21
7.1.8 Troubleshooting Guide..........................................................................................................21
7.2 MAGNETIC CLUTCH .........................................................................................................................22
7.3 EVAPORATOR MOTOR .....................................................................................................................22