UTICA BOILERS MGB50 Installation, Operation & Maintenance Manual page 20

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
flue collector and boiler castings.
A visual check of the main burner and pilot flames should
be made at the start of the heating season and again in
mid-season. The main burner flame should have a well
defined inner blue mantel with a lighter blue outer mantel.
Check the burner throats and burner orifices for lint or dust
obstruction. Figures 20 and 21.
Figure 19 - Gas Burner Flame
Figure 20 - Gas Burner Orifices
The pilot flame should envelop ⅜ to ½ inch of the tip of the
pilot thermocouple, ignition/sensing electrode or mercury
sensor. Figure 21.
general InstructIons
Figure 21 - Gas Burner Pilot
3/8" TO 1/2"
IN FLAME
To adjust the pilot flame, remove the pilot adjustment
cover screw and turn the inner adjustment screw
counterclockwise
decrease pilot flame. 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 flammable vapors and liquids.
The free flow of combustion and ventilating air to the boiler
and boiler room must not be restricted or blocked.
Inspect field sourced low water cutoffs annually, or as
recommended by low water cutoff manufacturer. Flush
float type low water cutoffs per manufacturer's instructions.
It is recommended that a qualified 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.
20
IGNITION ELECTRODE
to increase or clockwise to