PDX SERVICE PROCEDURE V
Blower Temperature Switch Testing
and Replacement
Blower Temperature Switch
Replacement. WARNING
120 volt potential exposure. Use caution
to avoid personal injury.
Step 1. Position gas control power switch to the “OFF” position
and unplug heater from wall outlet.
Step 2. Remove tubing from inle t pressure tap.
Step 3. Remove the three screws (Phi llips screw driver) from the
control access coveron blower and remove cover.
(see photo 20)
20
Step 4. Locate blower temperature switch (see photo 21)
Step 5. Disconnect red and yellow wire leads from switch.
Step 6. With an appropriate tool such as side cutters, snip the
retaining lug from th e blower housing to allow removal of
temperature switch (see photo 22).
Step 7. Remove switch from b lower housing.
Step 8. Install new switch. Be sure switch is properly seated in
mounting area.
Step 9. Reconnect red and yellows wires to new switch. Wires are
interchangeable with either terminal.
Step 10. Position gas control power switch to the “ON” position
and verify proper heater operation.
Step 11. Replace control access cover from step2.
Blower temperatur e
switch location
21
Snip retaining lug
from blower housin g
22
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PDX Series
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