Bradford-White Corp D4504S*F(BN, D4403S*F(BN, SX) Pilot Inspection, Testing and Replacement cont’d

Pilot Maintenance

Pilot Inspection, Testing and Replacement (cont’d)

Step 7. Disconnect the spark igniter/flame sensor wire from gas control.

Gas control

Spark igniter/flame

sensor wire

Step 8. Remove the burner assembly from the combustion chamber.

Burner assembly

Step 9. Remove the pilot assembly from the main feedline using a 1/4" nut driver.

Pilot assembly

1/4” nut driver

Step 10. Visually inspect the spark igniter/flame sense wire for damage. Replace the pilot assembly, if damage is found.

Step 11. With a multi-meter set to the ohms setting, check continuity through the spark igniter/flame sense wire. Replace the pilot, if there is no continuity.

Multi-meter

Step 12. Visually inspect the spark igniter/flame sense electrode for deterioration. Replace the pilot assembly, if necessary. The electrode should not be in contact with pilot hood. If it is in contact with the pilot hood, carefully adjust electrode to a gap distance of 3/32" from the pilot hood.

Step 13. Visually inspect the spark igniter/flame sense electrode for oxidation build up. Carefully clean any oxidation using very fine emery cloth.

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