Section 22: HEATING AND AIR CONDITIONING
PA1564
12
Problem/Symptom
Probable Causes
Actions
Select FAULT DIAGNOSTIC and
ELECTRICAL SYSTEM. The message
“Voltage Module A52, Value too Low,
Active” confirms a power problem on the
module
2. Check / reset circuit breaker CB7
3. Check / replace fuse F65
Evaporator fan not
functioning
Circuit breaker CB4 tripped
Module A54 is not powered or is
faulty
Faulty brushes
1. Check / reset circuit breaker CB4
2. Check the SYSTEM DIAGNOSTIC menu
of the message center display (MCD).
Select FAULT DIAGNOSTIC and
ELECTRICAL SYSTEM. The message
“Voltage Module A54, Value too Low,
Active” confirms a power problem on the
module
3. Check / reset circuit breaker CB4
4. Check / replace fuse F67 , F68
8. CENTRAL HVAC SYSTEM - AIR
CONDITIONING
The schematic of Figure 16 shows the central A/C
system and its components. The central system is
equipped with a 6 cylinder, 05G-134A Carrier
compressor with an air conditioning capacity of
7½ tons. The receiver tank and filter dryer are
mounted inside the condenser compartment.
XLII Converted vehicles may be supplied with a
central or small A/C system (Fig. 16 and 40). For
vehicles equipped with a small A/C system, refer
to paragraph 10: SMALL HVAC SYSTEM – AIR
CONDITIONING COMPONENTS further in this
section.
8.1 A/C
CYCLE
Refrigeration may be defined as "the transfer of
heat from a place where it is not wanted to a
place where it is unobjectionable". Components
required for a closed circuit refrigeration system
are shown in Figures 16 and 41.
The air conditioning system used on XLII series
vehicle is of the
"Closed"
type using
"R-134a".
1. The refrigerant flowing to the compressor is
compressed to high pressure and reaches a
temperature higher than the surrounding air.
It is passed through the air-cooled fins and
tubes of the condenser causing the hot, high
pressure gas to be condensed into a liquid
form.
2. The liquid refrigerant flows to the receiver
tank, then back to the condenser sub-
cooler. It leaves the condenser and passes
through a filter dryer where moisture, acids
and dirt are removed and then through a
moisture indicator which indicates if any
moisture is present in the system.
3. By its own pressure, the liquid refrigerant
flows through a thermal expansion valve
where the pressure drop causes the
refrigerant to vaporize in a vapor-liquid state
at a low temperature pressure.
4. The cold low pressure refrigerant passes
through the main and the driver’s
evaporator coils which absorbs heat from
the air passing over the fins and tubes, and
changes into gas. In this form, the
refrigerant is drawn into the compressor to
repeat the air conditioning cycle.
5. The success of the air conditioning system
depends on retaining the conditioned air
within the vehicle. All windows and intake
vents should be closed. An opening of
approximately 8 in
2
(5162 mm
2
) could easily
neutralize the total capacity of the system.
6. Other causes of inadequate cooling are
dirty coils or filter. Dirt acts as insulation and
is also serves as a restriction to the air flow.
Summary of Contents for LE MIRAGE XLII BUS SHELLS
Page 1: ...COACH MANUFACTURER MAINTENANCE MANUAL LE MIRAGE XLII BUS SHELLS PA1564 1ST EDITION...
Page 12: ...Section 00 GENERAL INFORMATION 10 PA1564 FIGURE 13 METRIC US STANDARD CONVERSION TABLE 00005...
Page 13: ...Section 00 GENERAL INFORMATION PA1564 11 FIGURE 14 CONVERSION CHART 00006...
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Page 63: ...SECTION 01 ENGINE PA1564 33 FIGURE 13 POWER PLANT CRADLE INSTALLATION 01140...
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Page 229: ...FAULT CODE MANUAL Created on 00 04 25 15 30 1 FAULT CODE MANUAL B7L B7TL B12...
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Page 379: ...Section 12 BRAKE AND AIR SYSTEM PA1564 21 FIGURE 38 AIR OPERATED BRAKING SYSTEM WE...
Page 380: ...Section 12 BRAKE AND AIR SYSTEM PA1564 22 FIGURE 39 AIR OPERATED BRAKING SYSTEM W5...
Page 387: ...Section 12 BRAKE AND AIR SYSTEM PA1564 29 FIGURE 46 ABS 6S 5M CONFIGURATION...
Page 418: ...16 BW2158 Honeywell Commercial Vehicle Systems Company 4 2001 Printed in USA...
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Page 926: ...PROCEDURE NO SAV00044 REVISION 00 Page 2 of 2 Slide out...
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Page 1086: ...Section 22 HEATING AND AIR CONDITIONING PA1564 18 FIGURE 17 DOUBLE SWEEP EVACUATION SET UP...
Page 1118: ...Section 22 HEATING AND AIR CONDITIONING PA1564 50 FIGURE 54 HEATER LINE SHUTOFF VALVES WE...
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Page 1125: ...Compressor 62 11052 Rev A WORKSHOP MANUAL for MODEL 05G TWIN PORT COMPRESSOR R...
Page 1126: ...WORKSHOP MANUAL COMPRESSOR MODEL 05G TWIN PORT...
Page 1149: ...Compressor 62 11053 Rev B SERVICE PARTS LIST for MODEL 05G TWIN PORT COMPRESSOR 1 2 3 4 5 6 R...
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Page 1223: ...Section 26 XLII SLIDE OUT PA1564 11...
Page 1224: ...Section 26 XLII SLIDE OUT PA1564 12 FIGURE 16 KEYLESS BUSHING INSTALLATION INSTRUCTION...