Bradford White EF-100T-399-3X - Manual (Page 64)

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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
between 3/16" - 1/4" (see photo below).
Step 3. If spark gap is not between 3/16" - 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" - 1/4“ after bending.
Step 5. Reinstall the combustion system per “Combustion System Replacement Procedure” and check several
ignitions to ensure the burner lights smoothly.
Spark Rod
Burner Tube
Spark Rod
Hold spark rod
near ceramic
insulator
Bend spark
rod near
burner tube
CAUTION
Use caution while performing these
steps to prevent stressing or cracking
the ceramic insulator.
WARNING
Spark gap must be set to 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 heater.
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