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12821-2-0903
PILOT FLAME CHARACTERISTICS
The correct flame will be almost horizontal, blue and will extend
past the thermocouple 1/4" (6mm). The flame will surround the
thermocouple just below the tip.
On Propane (LP-gas) slight yellow might occur where the pilot
flame and the burner flame meet.
Natural gas pilots require adjusting when the inlet pressure is
above 5" w.c. (1.25kPa) Remove pilot adjustment cover. Turn
adjustment screw clockwise to reduce flame.
Propane (LP-gas) will not require adjusting.
After use, cleaning of the pilot burner may be required for the
proper flame. The pilot orifice can be cleaned with high pressure
air or by placing under running water. Pilot orifice must be dry
before replacement. Use a pipe cleaner to clean inside the pilot
after the pilot orifice has been removed.
To Remove Pilot Orifice
1. Disconnect the pilot supply line at the pilot burner.
2. Remove pilot orifice from pilot burner.It may be necessary to
tap on pilot burner in order to remove the pilot orifice.
Figure 5
MAIN BURNER FLAME CHARACTERISTICS
There will be a short blue inner flame with a larger, lighter blue
secondary flame. The burner flame may have yellow tips when
hot. Dust in the combustion air will produce an orange or red
flame. Do not mistake the orange or red flame for an improper
yellow flame.
Attention: On Propane gas, if a whistling noise (resonation)
occurs close the air shutter on the main burner in order to reduce
the amount of primary air. The reduction in primary air will soften
the main burner flame and will eliminate the whistling noise
(resonation).
On Propane or Natural gas if a yellow flame occurs open the air
shutter on the main burner in order to increase the amount of
primary air. The increase in primary air will sharpen the main
burner and will eliminate the yellow flame.
After use, cleaning of the main burner may be required for the
proper flame. The main burner may be cleaned by forcing water
into the ports and the throat of the burner. The burner should be
blown dry or heated to remove all water before replacement.
Figure 6
On Propane Gas, if a whistling noise (resonation) occurs
a. Close the air shutter on the main burner in order to reduce
the amount of primary air.