PDV Series
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Service Procedure III
Pressure Switch Testing and
Replacement
Pressure Switch Replacement
Step 1. Position the gas control power
switch to the “OFF” position.
Step 2. Identify correct pressure switch for replacement (see photo 3).
Step 3. Remove three screws (Phillips screwdriver) from the control access cover
on the blower assembly and remove the cover (see photo 4).
Step 4. Remove the screws (Phillips screwdriver) that attach the switch to housing.
Then carefully remove tubing from pressure switch (see photo 5).
Step 5. Disconnect the wire leads from the pressure switch (see photo 6).
Step 6. Reconnect the wires from Step 5 to the new pressure switch.
Step 7. Carefully position the pressure switch into the blower housing and replace the
screws from Step 4.
Step 8. Replace the control access cover from Step 3 and fasten in place with the
three screws.
Step 9. Reconnect the tubing to the new pressure switch.
Step 10. Position the gas control power switch to the “ON” position and verify proper
heater operation.
EXHAUST PRESSURE SWITCH
INTAKE PRESSURE SWITCH
WARNING
115 volt potential exposure. Use
caution to avoid personal injury.
3
4
5
6
4
6
ESSURE SWITTCH
INTAKE PR
T
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