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PROCEDURE 16
PROCEDURE 16 (continued) - REPLACING 4-WAY VALVE/MANIFOLD ASSEMBLY/PILOT
VALVES
4
Replacing 4-way Valve Manifold Assembly (continued) (FIGURE 2).
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24. Check for proper system operation. (Refer to the SPECIFICATION section of this manual).
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25. Re-install cabinet (Refer to PROCEDURE 1 - REMOVING CABINET).
Y
Replacing Pilot Valve Poppets and "O" Rings (FIGURES 3 & 4).
V
NOTE: Both pilot valves can be accessed while the 4-way valve and sieve bed hoses are intact on
the concentrator.
A
L
NOTE: DO NOT remove spade connectors from pilot valve coils. Simply lay coils with spade con-
V
nectors aside while performing this installation.
E
1. Hold pilot valve stem with the flat blade screwdriver and turn the 9/16-inch locknut counterclockwise
one (1) complete turn.
2. Unscrew the pilot valve stem assembly from the manifold while leaving the coil with yoke and locknut
intact on stem.
3. Remove pilot valve poppet from inside the pilot valve stem.
STOP!
DO NOT REMOVE THE COIL YOKE FROM THE COIL.
The Washer between the Bottom of the Yoke and the Bottom of Coil
IS NOT DESIGNED TO BE REMOVED and difficulty in reassembly
will be encountered that could cause damage to components.
4. Set aside the coil with yoke and pilot valve stem assembly with the wires still intact.
DO NOT use sharp tools to remove "O" ring from plastic manifold opening. Damage to the
plastic manifold and/or plastic manifold airflow passage could occur (FIGURE 3).
5. Remove "O" ring from manifold opening.
6. Discard old poppet and "O" ring.
7. Install NEW "O" ring into the opening in the plastic manifold housing.
DO NOT overtighten pilot valve stem when installing it into plastic manifold. Damage to the
rubber "O" ring and/or plastic manifold may occur.
8. Install NEW slotted poppet into the bottom of the pilot valve stem with tapered end facing to the bottom
(FIGURE 3).
9. Install pilot valve stem and NEW slotted poppet with coil with yoke and locknut intact into manifold
opening.
CAUTION
"O" Ring
FIGURE 3 - REMOVING/INSTALLING "O" RINGS
CAUTION
Manifold
Opening
Air Flow
Passage
56
4-WAY VALVE
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