Bradford White EF120T4003NA3 Service Manual page 29

Combustion System Testing and Replacement
Combustion System Replacement Procedure
1. Fully inspect burner mounting insert gasket for the following:
a. Tears
b. Missing material
c. Cracks
If gasket is NOT affected by any of the above, gasket replacement is not required.
2. Install combustion assembly using new gasket or fully inspected gasket from Step 1. Secure combustion
assembly at the burner mounting insert using screws from Step 6 on previous page. Tighten bolts evenly.
3. Reconnect high voltage cable to spark rod, flame sensor, blower, and gas valve.
4. Reconnect intake venting, gas supply, and silicone tubing to gas valve. Turn ON gas supply to heater and check
for gas leaks. Repair any gas leaks found.
5. Restore 120 volt power supply to water heater and confirm proper operation following the lighting instructions on
the lighting instruction label, or the lighting instructions located in the Installation and Operating Manual.
6. Replace surround cover on top of water heater.
Service Procedure II:
d. Dirt or debris
e. Other imperfections that would inhibit proper seal
120T400
29
120T500
29