PREVOST LE MIRAGE XLII BUS SHELLS User Manual

SECTION 22: HEATING AND AIR CONDITIONING
PA1553
1
CONTENTS
1. HEATING AND AIR CONDITIONING...................................................................................................5
2. AIR CIRCULATION WITH CENTRAL HVAC SYSTEM.......................................................................5
2.1 DRIVER’S AREA.................................................................................................................................5
2.2 CABIN AREA .....................................................................................................................................5
3. AIR CIRCULATION WITH SMALL HVAC SYSTEM............................................................................5
4. SMALL HVAC SYSTEM OPERATION.................................................................................................6
5. CENTRAL HVAC SYSTEM OPERATION............................................................................................6
5.1 DRIVER’S UNIT OPERATION ...............................................................................................................6
5.2 CABIN UNIT OPERATION ....................................................................................................................7
6. HVAC UNIT MAINTENANCE................................................................................................................8
6.1 COIL CLEANING.................................................................................................................................8
6.2 DRIVER'S HVAC UNIT & CABIN HVAC UNIT AIR FILTERS ......................................................................9
7. HVAC SYSTEM PARTICULARITIES, TESTING AND TROUBLESHOOTING.................................10
7.1 HVAC SYSTEM AND TEST MODE FOR SWITCHES AND SENSORS .......................................................10
7.2 HVAC SYSTEM AND TEST MODE FOR ELECTRIC MOTORS .................................................................11
7.3 PARTICULARITIES............................................................................................................................11
7.4 HVAC SYSTEM TROUBLESHOOTING..................................................................................................12
8. CENTRAL HVAC SYSTEM - AIR CONDITIONING ...........................................................................13
8.1 A/C CYCLE .....................................................................................................................................13
8.2 REFRIGERANT.................................................................................................................................14
8.2.1 Procurement..........................................................................................................................14
8.2.2 Precautions in Handling Refrigerant .....................................................................................14
8.2.3 Treatment in Case of Injury...................................................................................................14
8.2.4 Precautions in Handling Refrigerant Lines............................................................................15
8.3 PUMPING DOWN .............................................................................................................................17
8.4 ADDING REFRIGERANT (VAPOR STATE)............................................................................................18
8.5 EVACUATING SYSTEM .....................................................................................................................18
8.5.1 Double Sweep Evacuation Procedure ..................................................................................18
8.6 CHARGING SYSTEM.........................................................................................................................20
8.7 REFRIGERANT SYSTEM CLEAN-OUT AFTER COMPRESSOR FAILURE...................................................20
8.7.1 Determining Severity of Failure.............................................................................................20
8.7.2 Clean-out after Minor Compressor Failure............................................................................20
8.7.3 Clean-out After Major Compressor Failure ...........................................................................21
9. CENTRAL HVAC SYSTEM – AIR CONDITIONING COMPONENTS ...............................................21
9.1 COMPRESSOR (CENTRAL SYSTEM)..................................................................................................21
9.1.1 Belt Replacement..................................................................................................................21
9.1.2 Pulley Alignment....................................................................................................................22
9.1.3 Longitudinal Compressor Alignment .....................................................................................22
9.1.4 Horizontal Compressor Alignment ........................................................................................22
9.1.5 Vertical Compressor Alignment.............................................................................................22
9.1.6 Compressor Maintenance.....................................................................................................23
9.1.7 Troubleshooting Guide..........................................................................................................23
9.2 MAGNETIC CLUTCH.........................................................................................................................23
9.3 EVAPORATOR MOTOR .....................................................................................................................23
9.3.1 Removal ................................................................................................................................24

PREVOST LE MIRAGE XLII BUS SHELLS Specifications

General

Brand	PREVOST
Model	LE MIRAGE XLII BUS SHELLS
Category	Buses
Language	English