Pressure Switch Replacement - Bradford White M1TW40S Series Service Manual

Pressure Switch Replacement

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 3).
Step 3. Carefully remove pressure
switch from blower
housing (see photo 4)
Step 4. Disconnect tubing from
pressure switch.
(see photo 5)
Step 5. Disconnect yellow wires
from pressure switch
(see photo 6)
Step 6. Reconnect wires from step 5 to new pressure switch.
Step 7. Reconnect tubing to new pressure switch.
Step 8. Carefully position pressure switch into blower housing.
Step 9. Position gas control power switch to "ON" position and verify proper heater operation.
Step 10. Replace control access cover from step 2.
115 volt potential exposure. Use caution
3
TTW SERVICE PROCEDURE III
Pressure Switch Testing and
Replacement
WARNING
to avoid personal injury.
4
Slide pressure switch in direction
of arrow while tilting slightly away
from blower housing.
5
Pressure Switch
6
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