UTICA BOILERS MGB50 Installation, Operation & Maintanance Manual page 19

National Excelsior Company
www.excelsiorhvac.com
6. With the paper still in place in the base, clean the top of
the boiler castings of the boiler putty or silicone used to
seal between the castings and flue collector. Make certain
that chips are not lodged in the flue passageways.
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 #19 and #20)
Figure #19
Figure #20
GAS VALVE
KNOB
ORIFICES
The pilot flame should envelop ⅜ to ½ inch of the tip of the
pilot thermocouple, ignition/sensing electrode or mercury sen-
sor. (Figure #21)
GENERAL INSTRUCTIONS
3/8" TO 1/2"
IN FLAME
To adjust the pilot flame, remove the pilot adjustment cover
screw (Figures #14 - #16 on previous pages) and turn the
inner adjustment screw counterclockwise
or clockwise
cover screw after adjustment to prevent possible gas leakage.
The burners and pilot should be checked for signs of corro-
sion, 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.
It is recommended that a qualified service agency be em-
ployed to make an annual inspection of the boiler and heat-
ing 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.
BURNER
DOOR
19
Subject to change without notice.
Figure #21
IGNITION ELECTRODE
to decrease pilot flame. Be sure to replace
to increase