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PROPER MAIN BURNER FLAME
The correct flame will be a short blue inner flame with a much
larger light blue outer flame. The burner does not have a primary
air adjustment. The flame will be proper if the factory-set pressure
and orifice are used. After the furnace has begun operating, cleaning
of the burner may be needed for proper flame, examine at least 2
times per season.
Service must be performed by a Qualified Installer, Service
Agency, or the Gas Supplier.
To clean burner ports, disconnect the gas supply to the valve. Remove
the burner assembly from the combustion chamber. Remove pilot
burner from main burner and then remove the main burner. Force
water into the ports and blow dry with vacuum cleaner air, or low
pressure compressed air.
Figure 42
PROPER PILOT FLAME
The correct flame will be blue, extending past the thermopile. The
flame will surround the thermopile just below its tip.
Natural gas pilots require adjusting when the inlet gas pressure is
above 5" w.c. (1.245kPa). Remove the pilot cover screw on the
control valve and turn the adjustment screw clockwise to reduce
flame. Replace pilot cover screw to eliminate gas leaking at that
control valve opening.
LP gas (propane) will not require adjustment.
After use, cleaning may be required for the proper flame.
Examine the pilot flame before and during each heating season.
Figure 43
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