Midco Unipower MPG Series - Manual (Page 3)

The opening should be located at least six feet above ground level to prevent accidental
obstruction. If a direct opening to the outside air is not available, an amply sized air duct can be
run to the nearest outside air source or if practical, open stairwells or building corridors
connecting to an outside wall having a ventilating opening can be used for this purpose, provided
that no possibility of accidental closure exists.
While the spark ignition pilot system performs successfully under moderate or momentary
back draft conditions, it is not intended for operation under sustained reverse draft, for example,
in a building with large ventilating fans but with insufficient make-up air. Even if burner operation
is successful under these conditions, they must be corrected to prevent the hazard of drawing
flue gases into the building. Consult your local gas company when doubt exists concerning boiler
room ventilation.
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The heating system, both the gas utilization equipment and the distribution system, should be
in good operating conditions and sufficient to properly heat the building. It should be determined if
any serious faults are present that would cause excessive fuel consumption, unsafe operation or
improper heating, and measures taken to correct them.
Firing door catches should be filed off or otherwise arranged so that the door will open easily
to relieve pressure. No positive catches should be used. The use of a spring-type door holder is
recommended.
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Mount the burner to the gas utilization equipment. A tight seal between the mounting flange
and the front plate should be accomplished using the supplied high temperature rope. When
installing the gas burner the distance from the flange to the blast tube edge should be the same
as the gas utilization equipment wall thickness plus the flange gasket or rope thickness. That
means the burner blast tube will be flush with the inner chamber wall after the burner has been
installed. If the blast tube is extended into the combustion chamber possible damage to the
burner may happen. See Figure 1 & 2 for reference.
3
Part 1 Installation
II Preparation of
the Gas Utilization
Equipment
III Combustion
Chamber
Figure 1: Dry Base Boiler with Combustion
Chamber Liner (Warm Air Furnace
Construction is Similar)
Figure 2: Wet Base Boiler with Unlined
Combustion Chamber
Figure 3: Scotch Marine Boiler
Figure 4: Warm Air Furnaces
I Ventilation
Continued