PREVOST LE MIRAGE XLII BUS SHELLS User Manual

Section 22: HEATING AND AIR CONDITIONING
PA1553
49
2. Check that there is no
restriction to the air
escaping from the
actuator casing.
3. Make sure that pilot
solenoid valve
operates properly.
11.1.6 Central Hot Water Pneumatic Valve
Assembly
o Description
The flow of hot water to the vehicle's central
heater core is controlled by a 3-way pneumatic
water valve assembly. The valve, located in the
evaporator compartment, is designed so that the
pilot solenoid valve, which is part of the
assembly, opens and closes a port which directs
air pressure to the actuator casing, thereby
allowing the hot water to enter the main heater
core or bypassing it.
When the vehicle is operating with no current to
the pilot solenoid valve, no air pressure is
admitted to the actuator casing, the cylinder
spring pushes up against the cylinder, thereby
allowing the hot water to enter the main heater
core.
The central heater water valve requires a
minimum amount of maintenance. The valve
should be free of dirt sediment that might
interfere with its operation. No other
maintenance is needed unless a malfunction
occurs.
FIGURE 58: CENTRAL HOT WATER PNEUMATIC VALVE
ASSEMBLY
22240
o Pneumatic Water Valve Disassembly
a) Shut off air supply pressure and electrical
current to the pilot solenoid valve.
Disconnect wires.
b) The water valve need not be removed
from the line. Unscrew nipple, the actuator
casing, tube, spindle and closure member
can be removed (Fig. 59).
c) Remove the snap ring using a pair of
pliers.
d) You can now access all seals for
replacement.
Pneumatic water valve replacement seal
kits:
 Water Side: 871389
 Actuator Side: 871388
FIGURE 59: PNEUMATIC WATER VALVE 22241
o Pneumatic Water Valve Reassembly
a) Assemble the actuator casing, tube,
nipple, spindle and closure member.

PREVOST LE MIRAGE XLII BUS SHELLS Specifications

General

Brand	PREVOST
Model	LE MIRAGE XLII BUS SHELLS
Category	Buses
Language	English