Section 22: HEATING AND AIR CONDITIONING
PA1553
48
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. 54).
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 54. 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.
FIGURE 57: PNEUMATIC WATER VALVE 22241
o Valve Troubleshooting
PROBLEM PROCEDURE
Valve fails to
close.
1. Check electrical supply
with a voltmeter. It
should agree with
nameplate rating.
2. Check pressure at pilot
solenoid valve inlet. It
must be at least equal
to the minimum
pressure stamped on
the nameplate. It
should not go below
minimum while valve is
operating.
Valve fails to open. 1. Check that the closure
member assembly,
and that main actuator
and cylinder springs
are free to travel.
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