SECTION 22: HEATING AND AIR CONDITIONING
DOB 2490-2789 | X3-45 Commuter PA1605 Maintenance Manual (Final Version – Rev.1 Feb 2015)
45
When using heat at or near a valve, wrap with
water saturated rag to prevent overheating of
vital parts.
8.5
DRIVER’S HOT WATER PNEUMATIC
VALVE ASSEMBLY
Description
The flow of hot water to the driver’s heater core
is controlled by a normally open (N.O.)
pneumatic 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.
When the vehicle is operating without electrical
supply 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.
Air pressure at port + 24-V signal at coil =
valve closed
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.
FIGURE 54: TYPE 1 (UP TO VIN F-7014) DRIVER'S UNIT
HOT WATER PNEUMATIC VALVE ASSEMBLY
FIGURE 55: TYPE 2 (FROM VIN F-7015) DRIVER'S UNIT
HOT WATER PNEUMATIC VALVE ASSEMBLY
8.5.1 Pneumatic Water Valve Disassembly
1. Shut off air supply pressure and electrical
current to the pilot solenoid valve.
Disconnect wires.
2. The water valve need not be removed from
the line. Unscrew nipple, the actuator
casing, tube, spindle and closure member
can be removed (Figure 56).
3. Remove the snap ring using a pair of pliers.
4. You can now access all seals for
replacement. See your vehicle Parts
Manual for replacement parts availability.
8.5.2 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 56. 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.
