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The pilot flame (Figure 11) going to the spark must be large enough
to completely cover the sparking area. With the proper flame, only
2 or 3 sparks will occur. More sparks indicate a small pilot flame
and no ignition with spark stopping after approximately 90 seconds
generally means not enough flame.
To adjust pilot flame remove the pilot cover screw on the control
valve (Figure 3, Page 9), and turn the adjustment screw clockwise
to reduce flame. Replace pilot cover screw to eliminate gas leakage.
The pilot flame will appear large. A blue nearly horizontal flame is
proper. The spark gap must be 1/8". A larger gap can result in the
spark occurring some other place. The pilot flame and the spark
gap are factory checked and tested.
After use, cleaning may be required for the proper flame.
MAIN BURNER FLAME CHARACTERISTICS
The correct flame will be a short blue inner flame with a much
larger light blue outer flame. The main burner (Figure 12) shows
the approximate height of each part of the flame for each gas. The
burner does not have a primary air adjustment. The flame will be
correct if the factory-set pressure and orifice opening are used. After
the furnace has been operating, the burner ports may be blocked
by foreign matter carried in by combustion air. Therefore, cleaning
of the burner may be needed for proper flame.
To clean burner port disconnect the gas supply to the valve, and
remove the eight screws fastening the burner door. After removing the
burner door from the combustion chamber, remove rear burner, pilot
burner and front burner. With front and rear burners removed from
furnace, force water into the ribbon ports and dry with air pressure.
Page 14
PILOT FLAME CHARACTERISTICS
Electrode and pilot burner must be kept clean. Clean through
pilot access hole with a small brush (toothbrush) and water.
Figure 11
Figure 12
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