17
4. Reinstall the burner being careful to fully engage the back of the burner box into the
retaining slot in the combustion chamber base. Failure to properly locate the burner will
result in erratic flame operation with the possibility of delayed ignition on light off.
5. Restore electrical power and gas supply to the boiler.
•
Following the lighting instructions put the boiler back into operation
•
Check for gas leaks and proper boiler and vent operation.
16.2. PILOT BURNER
Turn the pilot firing valve to off position and allow the boiler to try for ignition. Observe the spark
making sure that it is strong and continuous.
If the spark is not acceptable the igniter will have to be adjusted. This can be readily
accomplished after removing the main burner.
The spark gap should be 1/8” to 3/16”. Make sure that the electrode does not appear
overheated or fouled with carbon. It may be necessary to clean the ignition electrode using steel
wool. Once the pilot appears to be properly set, reinstall it into the appliance making sure to
properly tighten the pilot line connection.
If the pilot is removed from the main burner in the course of servicing the boiler, it is important to
replace all gaskets and seals. These seals are intended to prevent the bypass of air around the
pilot.
Figure 8
Once the spark is satisfactory, open the pilot gas and allow the pilot burner to light. Once air has
been purged from the pilot line, the pilot flame should appear almost instantly at the initiation of
spark. Cycle the pilot several times to confirm reliability. A properly set pilot will appear blue and
will engulf the igniter and ground electrode. (See figure 8)
Open the firing valve and allow the main burner to light. The pilot must not extinguish. After
running for 15 minutes, cycle the boiler to ensure that the pilot remains stable.
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