PREVOST X3-45 COMMUTER User Manual

SECTION 22: HEATING AND AIR CONDITIONING
24
DOB 1300-1556 | X3-45 Commuter PA-1648 Maintenance Manual First release Oct 2020
FIGURE 31: REFRIGERANT CIRCUIT SHUTOFF VALVE
FIGURE 32: REFRIGERANT CIRCUIT SHUTOFF VALVE
4.8 LIQUID REFRIGERANT SOLENOID
VALVE
The flow of liquid refrigerant to the driver’s unit
evaporator, passengers’ unit evaporator (main
evaporator) and overhead compartment
evaporator is controlled by one NC (normally
closed) solenoid valve on each circuit, for a total
of three solenoid valves.
The driver’s unit solenoid valve is located on the
ceiling of the spare wheel compartment (
FIGURE
33
) and is accessible through the reclining
bumper.
Two identical NC (normally closed) refrigerant
solenoid valves are found in the condenser
compartment (FIGURE 34). One is used to
control flow of refrigerant to the overhead
compartments evaporator while the other is
used to control flow to the driver’s and
passenger’s main evaporators.
FIGURE 33: DRIVER'S UNIT LIQUID SOLENOID VALVE
FIGURE 34: LIQUID REFRIGERANT SOLENOID VALVES
IN CONDENSER COMPARTMENT (X-SERIES)
4.8.1 Typical malfunctions
Faulty control circuit: Check the electric system
by energizing the solenoid with 24 V DC. A
metallic clicking noise indicates that the solenoid
is operating. Absence of clicking indicates a loss
of power or a defective solenoid. Check for
open breakers, open-circuit or grounded coils,
broken lead wires.
Burned-out coils: Check for open-circuit coil.
Replace coil if necessary.
Low voltage: Check voltage across the coil
leads. Voltage must be at least 85% of the
nameplate rating.
Excessive leakage: Disassemble valve and
clean all parts. Replace worn or damaged parts
with a complete repair kit for best results.

PREVOST X3-45 COMMUTER Specifications

General

Engine	Volvo D13
Transmission	Allison B500
Fuel Type	Diesel
Length	45 ft (13.7 m)
Width	102 in (2.6 m)
Horsepower	500 hp
GVWR	54, 000 lbs
Height	141 in