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Burner Flames
Prior to completing the start-up, check the
appearance of the main burner flame. See
Figure 37 - 1.2" w.c. Manifold and Figure
38 - 3.5" w.c. Manifold for flame
characteristics of properly adjusted natural
gas systems.
Figure 37 - 1.2" w.c. Manifold Natural Gas
Figure 38 - 3.5" w.c. Manifold Natural Gas
66
1.
The
burner
predominately blue in color and well defined
and centered at the tube entry as shown in
Figure 37 - 1.2" w.c. Manifold and Figure
38 - 3.5" w.c. Manifold. Distorted flame or
yellow tipping of natural gas flame, or a
long yellow flame on propane, may be
caused by lint and dirt accumulation inside
burner or at burner ports, at air inlet between
burner and manifold pipe, or debris in the
main burner orifice. Soft brush or vacuum
clean
affected
areas
Shutdown procedure.
2. Poorly defined, substantially yellow
flames, or flames that appear lazy, indicate
poor air supply to burners or excessive
burner input. Verify gas supply type and
manifold pressure with rating plate.
3. Poor air supply can be caused by
obstructions or blockage in heat exchanger
tubes or vent discharge pipe. Inspect and
clean as necessary by to eliminate blockage.
Vacuum any dirt or loose debris found in the
tubes or vents. Clean heat exchanger tubes
with stiff brush after performing Shutdown
procedure. Poor flame characteristics can
also be caused by undersized combustion air
openings or flue gas recirculation into
combustion air supply. Increase air opening
size or re-direct flue products to prevent re-
circulation.
4. Reduced air delivery can also be the result
of fan blade slippage, dirt accumulation the
fan blade or low voltage to draft inducer
motor. Inspect draft fan assembly and be
sure fan blade is secure to motor shaft.
Check line voltage to heater.
WARNING
Do not store or use gasoline or other
flammable vapors and liquids in the
vicinity of this or any other appliance.
flame
should
be
after
performing
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Troubleshooting
