Williams 4505622A Owner's Manual page 15

Operating Your Furnace
Operating the Furnace
Always follow the instructions located beneath the furnace grille
when lighting the pilot. To set the thermostat, turn the temperature
selector to the highest setting until the heated area reaches the
desired temperature, then move the selector slowly toward a
lower setting until the furnace control cycles off the burner. At this
setting, the furnace should cycle on and off as required to
maintain the desired temperature.
WARNING: The surface of the furnace is hot during
operation. Keep children, clothing, furniture and
flammable material away from the furnace.
This furnace is equipped with a control that limits the temperature
of the furnace grille by cycling the main burner. This control may
be overridden to allow more heat output from the furnace during
extreme weather when the furnace will not provide sufficient heat
otherwise. The override mechanism is located beneath the grille
on the control end. To override the temperature limit control, pull
up on the chain attached to the grille until the flap bearing
the "Register Hot --" warning is in the horizontal position. Insert
chain through slot to the side of the flap to hold flap in the
horizontal position (see Figure 13). To reactivate the temperature
limit control, remove chain from slot and the flap will hang down.
Do not override the temperature limit control if the furnace is in
an area occupied by children or elderly persons who could
fall on the furnace and be burned.
FIGURE 13
Burner Flame Characteristics
Start the furnace and let it operate for at least 10 minutes. Open
the access door to view the burner flame. Limit your movements
near the furnace 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, for models
equipped with round stainless steel burners.
FIGURE 14 Burner Flame Characteristics
Normal Appearance
Natural Gas:
1. Inner cone- blue color - 3/8 to 5/8-inch above the ports.
2. Secondary inner cone - light blue - 1 to 2-inches above the
ports.
3. Total flame - from blue to nearly invisible - approximately 6-
inches above the ports.
L.P. Gas:
1. Inner cone - blue color - 1/2 to 3/4-inch above the ports.
2. Secondary inner cone - light blue - 1 to 2-inches above the
ports.
3. Total flame - from blue to nearly invisible - approximately 6-
inches above the ports.
Abnormal Appearance
Lazy Flame:
Long soft yellow cones moving around in the combustion chamber
lifting from the ports (insufficient air).
Extremely Fast Flame:
Flame will not hold to the 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.
Care – 15