21
When the cleaning process is complete, restore the boiler
components to their original position. Use IS-808 GE
silicone (available from a distributor) to seal around the
fl ue collector and boiler castings.
A visual check of the main burner and pilot fl ames should
be made at the start of the heating season and again in
mid-season. The main burner fl ame should have a well
defi ned inner blue mantel with a lighter blue outer mantel.
Check the burner throats and burner orifi ces for lint or dust
obstruction. Figures 20 and 21.
Figure 20 - Gas Burner Orifi ces
The pilot fl ame should envelop
⅜
to ½ inch of the tip of the
pilot thermocouple, ignition/sensing electrode or mercury
sensor. Figure 21.
Figure 20 - Combustion Chamber
BURNERS
ORIFICES
GAS VALVE
To adjust the pilot fl ame, remove the pilot adjustment
cover screw and turn the inner adjustment screw
counterclockwise
to increase or clockwise
to
decrease pilot fl ame. Be sure to replace cover screw after
adjustment to prevent possible gas leakage. Figures 15 -
17 on previous pages.
The burners and pilot should be checked for signs of
corrosion, rust or scale buildup. The area around the boiler
must be kept clear and free of combustible materials,
gasoline and other fl ammable vapors and liquids.
The free fl ow of combustion and ventilating air to the boiler
and boiler room must not be restricted or blocked.
Inspect fi eld sourced low water cutoffs annually, or as
recommended by low water cutoff manufacturer. Flush
fl oat type low water cutoffs per manufacturer's instructions.
It is recommended that a qualifi ed service agency be
employed to make an annual inspection of the boiler and
heating system. They are experienced in making the
inspections outlined above, and, in the event repairs or
corrections are necessary, trained technicians can make the
proper changes for safe operation of the boiler.
GENERAL INSTRUCTIONS
IGNITION ELECTRODE
3/8” TO 1/2”
IN FLAME
Figure 19 - Gas Burner Flame
Figure 21 - Gas Burner Pilot
