Section 22: HEATING AND AIR CONDITIONING
PA1564
30
16
o
F (-11.1 to -8.8
o
C) of superheat at the
evaporator outlet.
This ensures that the refrigerant leaving the
evaporator is in a completely gaseous state
when drawn into the suction side of the
compressor. Liquid would damage the
compressor valve, piston and heads if allowed
to return in the suction line.
FIGURE 35: EXPANSION VALVE
22045
A vapor is said to be superheated when its
temperature is higher than the saturation
temperature corresponding to its pressure. The
amount of the superheat is, of course, the
temperature increase above the saturation
temperature at the existing pressure.
As the refrigerant moves along in the
evaporator, the liquid boils off into a vapor and
the amount of liquid decreases until all the liquid
has evaporated due to the absorption of a
quantity of heat from the surrounding
atmosphere equal to the latent heat of
vaporization of the refrigerant. The gas
continues along in the evaporator and remains
at the same pressure. However, its temperature
increases due to the continued absorption of
heat from the surrounding atmosphere. The
degree to which the gas refrigerant is
superheated is related to the amount of
refrigerant being fed to the evaporator and the
load to which the evaporator is exposed.
Superheat Adjustment
The starting method of adjusting the superheat
is to unscrew completely the main evaporator
expansion valve adjusting screw, then screw in
13 turns clockwise for 134A (Fig. 36).
Afterwards, the following procedure should be
followed:
1. Operate vehicle for at least one-half hour at
fast idle with temperature control set at 82
o
F
(27,7
o
C), Then set temperature to minimum
to keep the compressor on 6 cylinders.
FIGURE 36: SUPERHEAT ADJUSTMENT INSTALLATION
22046
2. Install pressure gauge at the evaporator
suction header. You may install the
pressure gauge at compressor suction, but
then add 3 psi to reading.
3. Install a remote reading thermometer to the
evaporator outlet line near the existing
remote bulb (Fig. 36).
4. Apply thermostatic tape around the bulb
and evaporator outlet line to get a true
reading of the line temperature.
5. Block condenser if necessary to keep
pressure over 150 psi.
6. Check approximately 5 readings of
pressure at 2-minute intervals and convert
to temperature using the temperatures &
Содержание LE MIRAGE XLII BUS SHELLS
Страница 1: ...COACH MANUFACTURER MAINTENANCE MANUAL LE MIRAGE XLII BUS SHELLS PA1564 1ST EDITION...
Страница 12: ...Section 00 GENERAL INFORMATION 10 PA1564 FIGURE 13 METRIC US STANDARD CONVERSION TABLE 00005...
Страница 13: ...Section 00 GENERAL INFORMATION PA1564 11 FIGURE 14 CONVERSION CHART 00006...
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Страница 303: ...SPICER SPECIALITY AXLE DIVISION place product photo here SERVICE MANUAL GENERAL INFORMATION NDS Axle range BACK RETOUR...
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Страница 348: ...Page No 18 Manual No NDS8 Spicer Speciality Axle Division Technical Publications Spicer Speciality Axle Division TP1193...
Страница 379: ...Section 12 BRAKE AND AIR SYSTEM PA1564 21 FIGURE 38 AIR OPERATED BRAKING SYSTEM WE...
Страница 380: ...Section 12 BRAKE AND AIR SYSTEM PA1564 22 FIGURE 39 AIR OPERATED BRAKING SYSTEM W5...
Страница 387: ...Section 12 BRAKE AND AIR SYSTEM PA1564 29 FIGURE 46 ABS 6S 5M CONFIGURATION...
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Страница 782: ...Section 16 SUSPENSION PA1564 22 FIGURE 26 SWAY BAR FRONT SUSPENSION 16138D FIGURE 27 SWAY BAR REAR SUSPENSION 16014...
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Страница 1083: ...Section 22 HEATING AND AIR CONDITIONING PA1564 15 FIGURE 16 REFRIGERANT CIRCUIT CENTRAL SYSTEM 22247...
Страница 1086: ...Section 22 HEATING AND AIR CONDITIONING PA1564 18 FIGURE 17 DOUBLE SWEEP EVACUATION SET UP...
Страница 1106: ...Section 22 HEATING AND AIR CONDITIONING PA1564 38 FIGURE 39 REFRIGERANT CIRCUIT SMALL SYSTEM 22350...
Страница 1108: ...Section 22 HEATING AND AIR CONDITIONING PA1564 40 FIGURE 42 CENTRAL HEATING SYSTEM COMPONENTS 22338...
Страница 1118: ...Section 22 HEATING AND AIR CONDITIONING PA1564 50 FIGURE 54 HEATER LINE SHUTOFF VALVES WE...
Страница 1119: ...Section 22 HEATING AND AIR CONDITIONING PA1564 51 FIGURE 55 SMALL HEATING SYSTEM COMPONENTS 22337...
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Страница 1125: ...Compressor 62 11052 Rev A WORKSHOP MANUAL for MODEL 05G TWIN PORT COMPRESSOR R...
Страница 1126: ...WORKSHOP MANUAL COMPRESSOR MODEL 05G TWIN PORT...
Страница 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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Страница 1205: ...Section 24 LUBRICATION PA1564 5 FIGURE 1 LUBRICATION AND SERVICING POINTS ON INDEPENDENT FRONT SUSPENSION VEHICLES 24036_1...
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Страница 1223: ...Section 26 XLII SLIDE OUT PA1564 11...
Страница 1224: ...Section 26 XLII SLIDE OUT PA1564 12 FIGURE 16 KEYLESS BUSHING INSTALLATION INSTRUCTION...