Replacing Pilot Valve Poppets And O-Rings - Invacare Platinum IRC5LXO2AW Service Manual

SECTION 20—4-WAY VALVE

Replacing Pilot Valve Poppets and O-Rings

To prevent electrical shock, ALWAYS disconnect concentrator from electrical
outlet before servicing.
1. Turn power Off (O) and unplug the unit.
2. Remove cabinet. Refer to Cabinet on page 25.
3. Remove control panel. Refer to Removing Control Panel on page 50.
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.
NOTE: DO NOT remove spade connectors from pilot valve coils. Simply lay coils with spade
connectors aside while performing this installation.
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.
DO NOT remove the coil yoke from the coil. The washer between the bottom of
the yoke and the bottom of the coil MUST not be removed. Otherwise, components
may be damaged in reassembly.
8. 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 may occur. Damage
to airflow may result in improper oxygen delivery and harm to the user. Refer to
Detail "A" in FIGURE 20.3.
9. Remove poppet and O-ring from manifold opening (Detail "A").
10. Discard old poppet and O-ring.
11. Install new O-ring into the opening in the plastic manifold housing (Detail "A").
DO NOT overtighten pilot valve stem when installing it into plastic manifold.
Damage to the rubber O ring and/or plastic manifold may occur.
®
Platinum Oxygen
DANGER
CAUTION
WARNING
CAUTION
64
Part No 1118396