Williams 2001622A Owner's Manual page 17

Operating Your Heater
FIGURE 18 Burner Flame Characteristics
Burner Flame Characteristics
Start the heater and let it operate for at least 10 minutes. Open
the access door to view the burner flame. Limit your movements
near the heater a few more minutes before making your final
observation. The flame may look yellow due to dust particles in
the room air. The flame should change to a nice blue color with
firm inner and secondary cones. An occasional flash of orange
might be seen as dust particles burn in the flame. This is normal.
No burner adjustment is provided, or is necessary. (Figure 18).
Normal Appearance
Natural Gas:
1. Inner cone- blue color - 3/8 to 5/8-inch above ports.
2. Secondary inner cone - light blue - 1 to 2-inches above ports.
3. Total flame - from blue to nearly invisible - approximately 6-
inches above ports.
L.P Gas:
1. Inner cone - blue color - 1/2 to 3/4-inch above ports.
2. Secondary inner cone - light blue - 1 to 2-inches above ports.
3. Total flame - from blue to nearly invisible - approximately 6-
inches above ports.
Abnormal Appearance
Lazy Flame:
Long soft yellow cones moving around in the combustion chamber
lifting from ports (insufficient air).
Extremely Fast Flame:
Will not hold to ports - entire cone sections blow off from noisy
ports (too much pressure).
WARNING: If the flame appears abnormal, contact
the gas company or a qualified service technician
immediately.
WARNING: Natural gas heating value (Btu per cubic
foot) can vary significantly; therefore, it is the installer's
responsibility to see that the Btu input to the heater is
adjusted properly.
combustion chamber failure, asphyxiation, fire or
explosion, resulting in property damage, bodily injury or
death. Refer to the National Fuel Code (NFPA-54) to be
sure the heater is burning fuel at the proper rate.
Failure to do so could cause