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Inlet Pressure Switch
Replacement
WARNING
120 volt potential exposure. Use caution
to avoid personal injury.
Step 7. Reconnect wires from step 5 to new pressure switch.
Step 8. Reconnect tubing to new pressure switch.
Step 9. Replace control access cover from step 2.
Step 10. Position gas control power switch to “ON” position and verify proper heater operation.
Step 1. Position gas control power switch
to “OFF” position.
Step 2. Remove the three screws (Phillips screw driver) from control access cover on blower assembly and
remove cover (see photo 8).
Step 3. Disconnect the tubing from the pressure switch (see photo 9).
Step 4. Remove inlet pressure
switch from blower access
cover. (see photo 10).
Step 5. Disconnect yellow wires
from pressure switch (see
photo 11).
Step 6. Attach new inlet pressure
switch to blower control
access cover.
PDX SERVICE PROCEDURE III
Pressure Switch Testing and
Replacement
Page 20
8 9
PDX Series
10
Remove screws
to remove inlet
pressure switch
11
20