SECTION 22: HEATING AND AIR CONDITIONING
PA1621 Maintenance Manual All Series | Section Revised November 2017
25
Compressor unable to pull extremely low
vacuum with suction service valve
frontseated.
Cause:
Repeated liquid refrigerant floodback.
Flooded starts.
Overcharge of oil.
Discharge valves not seated properly (liquid
drainback during shutdown).
Expansion valve not controlling properly.
Unloader Valve Stuck Open
Symptom:
Loss of unit capacity at all temperatures.
Higher than normal suction pressure.
Even cylinder head temperature.
Cause:
Unloader body stem bent.
Foreign material binding unloader piston or
plunger.
4.1.5 Electro-Magnetic Clutch
Refer to Lang Electromagnetic clutch
mounting-dismounting and Bitzer
Maintenance Instruction kw-540-1 provided
with the technical publications in PDF format for
further details on electro-magnetic clutch
removal and installation.
4.2 COMPRESSOR – SMALL HVAC
SYSTEM
Consult Ice Compressor Service Manual, found
on your Technical Publications USB flash drive.
WARNING
Read the cautionary information in the small
Compressor Service Manual included at the
end of this section.
4.2.1 Removal - When the Compressor Is
Operational
Perform the “OIL RETURN OPERATION” (Refer
to paragraph 7.9).
NOTE
Belts specifications may vary. For proper belt
selection, always consult your vehicle Coach
Final Record.
4.2.2 Removal - When the Compressor Is
Inoperable
Perform the “Refrigerant Recovery” operation
(paragraph7.5).
Remove any tension on the belts
Slacken bolts fixing small compressor.
(FIGURE 32 and Figure 33)
Remove the compressor.
Reinstall following system clean-out
recommendations (Paragraph 7.6)
FIGURE 32: COMPRESSOR MOUNTING H-SERIES
FIGURE 33: COMPRESSOR MOUNTING X-SERIES
4.3 BRUSHLESS EVAPORATOR MOTOR
The brushless evaporator motor is installed in
the evaporator compartment (Figure 34). It is a
27.5 volt, 2HP (1,5 kW) motor which activates a
double blower fan unit.
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