750-211 (revised 2009)
Promethean Boilers, Model 4WI Manual
8-13
8.7 — Oil Burner Maintenance
FIGURE 8-15. Back Pressure Orifice
8.7.5 — Ignition System
For best results, maintain the proper gap and dimensions for the ignition electrode(s).
Inspect the electrode tip for signs of pitting or combustion deposits and dress as required with a fine file. Inspect
the porcelain insulator (s) for any cracks that might be present. If there are cracks, replace the electrode since they
can cause grounding of the ignition voltage. Since carbon is an electrical conductor, it is necessary to keep the insu-
lating portion of electrode(s) wiped clean if any carbon is present. Ammonia will aid in removing carbon or soot.
Check ignition cables for cracks in the insulation. Also see that
all connections between the transformer and the electrodes are
tight. Periodically remove the access plug from the gas pilot
aspirator and clean out any accumulated lint or other foreign
material.
FIGURE 8-16. Gas Pilot Electrode and Diffuser Spacing
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