Section 22: HEATING AND AIR CONDITIONING
PA1562
41
* Actuator Side: 871388
9.6.3 Pneumatic Water Valve Reassembly
1. Assemble the actuator casing, tube, nipple,
spindle and closure member.
2. Tighten the nipple in place in the body cavity
as per figure 44. Fasten pilot solenoid vale
to the pneumatic water valve. Reconnect air
supply pressure and electrical current to the
pilot solenoid valve.
3. Check for proper operation.
9.6.4 Pilot Solenoid Valve
1. No maintenance is needed unless a
malfunction occurs.
2. A pilot solenoid valve replacement seal kit is
available: 871390.
FIGURE 44: PNEUMATIC WATER VALVE 22330
9.6.5 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.
2. Check that there is no restriction to the air escaping from the
actuator casing.
3. Make sure that pilot solenoid valve operates properly.
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