PREVOST X3-45 Multiplex, Руководство по обслуживанию

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Section 22: HEATING AND AIR CONDITIONING
PA1562
24
For details about electrical wiring, refer to “A/C
and Heat system” in the master wiring diagram.
FIGURE 28: CONDENSER FAN MOTOR
22322
7.4.2 Condenser Fan Motor Removal
1. Set the battery master switch to the “Off”
position.
2. Disconnect wiring from terminals on motor.
Tag each wire to aid in identification at time
of reconnection.
3. Remove the four hexagonal head cap
screws retaining the fan motor assembly to
the mounting support.
4. Remove the motor.
7.5 RECEIVER TANK
The receiver tank is located in the condenser
compartment (Fig. 29). The function of the
receiver tank is to store the liquid refrigerant.
During normal operation, the level of the
refrigerant should be approximately at the mid-
point of the lower sight glass.
FIGURE 29: A/C CONDENSER COMPARTMENT
22323
In case of extreme pressure there will be a rise
in the liquid receiver tank. A pressure relief valve
will break at 450 psi (3103 kPa) and relieve the
receiver tank pressure.
The receiver tank incorporates an inlet valve on
the inlet side (upper section) which allows the
tank to be isolated or serviced. An outlet valve
on the outlet side (lower section) permits
complete isolation from the rest of the system.
7.6 FILTER DRYER
A filter dryer, also located in the condenser
compartment, is installed on the liquid
refrigerant line after the receiver tank. It is used
to absorb moisture and foreign matter from
refrigerant before it reaches the expansion
valves.
The filter should be replaced if the system has
been opened or after a prolonged exposure,
when the moisture indicator sight glass turns to
pink.
A filter dryer, located close to the engine
compartment L.H. side rear door, is installed on
vehicles equipped with an auxiliary A/C system.
Its function is similar to that of filter used on main
systems. Replace only when system is opened or
a problem occurs.
7.6.1 Replacement
The filter is of the disposable type. When
replacement is required, remove and discard the
complete unit and replace with a new unit of the
same type according to this procedure:
1. Isolate the refrigerant in the receiver tank by
following the “Pumping Down” procedure
explained in this section
2. Change the filter dryer as a unit.
3. Add a small quantity of refrigerant R-134a to
the low side of the system. Check for leaks.
Return the system to normal operation.
CAUTION
Do not use carbon tetrachloride or similar
solvents to clean parts. Do not use steam
guns. Use mineral spirits or naphtha. All parts
should be thoroughly cleaned. Use a stiff
brush to wash dirt from grooves, holes, etc.