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SECTION 20—4-WAY VALVE
Platinum™Series 80 Part No 1110538
28. Check for proper system operation. Refer to Typical Product Parameters on page 9.
29. Re-install cabinet. Refer to Removing Cabinet on page 25.
FIGURE 20.4 Replacing Manifold Assembly (Units Manufactured after 7/24/03)
Replacing Pilot Valve Poppets and O-Rings
ƽ DANGER
To prevent electrical shock, ALWAYS disconnect concentrator from electrical out-
let before servicing.
NOTE: For this procedure, refer to FIGURE 20.5.
1. Unplug unit.
2. Remove cabinet. Refer to Cabinet on page 25.
3. Remove control panel. Refer to Removing Control Panel
on page 62.
4. Locate pilot valve on 4-way valve manifold assembly.
NOTE: Pilot valve can be accessed while the 4-way valve and sieve bed hoses are intact on the
concentrator.
5. Hold pilot valve stem with the flat blade screwdriver and turn the 9/16-inch locknut
counterclockwise one complete turn.
6. Unscrew the pilot valve stem assembly from the manifold while leaving the coil with
yoke and locknut intact on stem.
7. Remove pilot valve poppet from inside the pilot valve stem.
1
2
3
4
Mounting
Screws
NOTE: The numbers indicate the
pre-torque to 10 ± 2 inch-lbs, then
torque to 22 ± 2 inch-lbs.
DETAIL “A” - MOUNTING SCREW
TORQUE SEQUENCE: