Replacing Pilot Valve Poppets And O-Rings - Invacare Perfecto 2 Series Service Manual

Replacing Pilot Valve Poppets and O-Rings

To prevent electrical shock, ALWAYS disconnect concentrator from electrical outlet
before servicing.
NOTE: For this procedure, refer to FIGURE 20.2 on page 71.
1. Unplug unit.
2. Remove cabinet. Refer to Cabinet on page 23.
3. Remove the 4-way valve/manifold assembly. Refer to Replacing 4-Way Valve and/or
Manifold Assembly on page 66.
4. Locate pilot valve on 4-way valve/manifold assembly.
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 20.2.
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.
Part No 1148070
SECTION 20—4-WAY VALVE/MANIFOLD ASSEMBLY
DANGER
CAUTION
WARNING
CAUTION
69
™
Perfecto
2