Service Procedure Vii: Spark Rod Gap Adjustment And Replacement - Bradford White UCG100H3993N Service Manual

Spark Rod Gap Adjustment and Replacement
Spark Rod Gap Inspection and Adjustment
Step 1. Remove combustion system as described in
"Combustion System Removal Procedure."
Step 2. Measure spark gap between the spark rod and
burner tube. Acceptable spark gap is from 3/16" to
1/4" (see photo below).
Step 3. If spark gap is not between 3/16" to 1/4", the spark
rod may be carefully bent by supporting the end
near the ceramic insulator with pliers and bending
the end near the burner tube with needle nose
pliers (see photo below).
Step 4. Re-measure and verify spark gap is between 3/16"
to 1/4" after bending.
Step 5. Verify the integrity of all gaskets and replace where required.
Step 6. Reinstall the combustion system per "Combustion System Replacement Procedure" and check several
ignitions to ensure the burner lights smoothly.
Burner Tube
32
Service Procedure VII:
Spark Rod
Spark gap must be set from 3/16" to 1/4". Failure to
set and verify proper spark gap may result in a
delayed ignition resulting in damage to the water
Use caution while performing these steps to
prevent stressing or cracking the ceramic insulator.
Spark Rod
32
WARNING
heater.
CAUTION
Hold spark rod
near ceramic
insulation.
Bend spark rod
near burner tube.