LG AR-DR11-08A Installation And Operation Manual page 38

GAS HEATER CONNECTION AND STARTUP
Burner Flames
Before completing the startup, check the appearance of the main burner flame. See figures for flame characteristics of properly adjusted
natural gas systems.
Figure 47: Burner Flame at Startup.
1. The burner flame must be predominately blue in color and well defined and centered at the tube entry as shown in the figures above. Dis-
torted 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.
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 neces-
sary to eliminate blockage. Vacuum any dirt or loose debris. Clean heat exchanger tubes with stiff brush. 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 the heater.
Shutdown
1. Set unit controller to lowest discharge air set-point (no call for
heat).
2. Turn OFF electrical supply at unit disconnect.
3. Turn off gas supply valve.
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Figure 48: Burner Flame at High Fire.
4. Disconnect manifold and inlet pressure taps and re-install tap
plugs.
5. Replace vestibule access panel and close door.