PREVOST LE MIRAGE XLII BUS SHELLS, Руководство по обслуживанию

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Section 22: HEATING AND AIR CONDITIONING
PA1564
42
11.1.4 Soldering
Before soldering any part of the system, make
sure the area is well ventilated. Use (stay clean)
flux sparingly and apply solder (95-5 round wire
1/8 inch [3,1 mm]). After completing repairs, test
for leaks.
When using heat at or near a valve, wrap with a
water saturated rag to prevent overheating of
vital parts.
11.1.5 Driver’s Hot Water Pneumatic valve
Assembly
o
Description
The flow of hot water to the driver’s heater core
is controlled by a pneumatic NO water valve
assembly. The valve, located at the ceiling of the
spare wheel 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
opening or closing the valve.
FIGURE 46: DRIVER'S HOT WATER PNEUMATIC VALVE
ASSEMBLY
22240
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
keeping the water valve open.
The driver’s 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.
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. 47).
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: 871311
™ Actuator Side: 871312
o
Pneumatic Water Valve Reassembly
a) Assemble the actuator casing, tube,
nipple, spindle and closure member.
b) Tighten the nipple in place in the body
cavity as per figure 47. Fasten pilot
solenoid vale to the pneumatic water
valve. Reconnect air supply pressure and
electrical current to the pilot solenoid
valve.
c) Check for proper operation.
o
Pilot Solenoid Valve
a) No maintenance is needed unless a
malfunction occurs.
b) A pilot solenoid valve replacement seal kit
is available: 871313.