Operating Your Furnace
Start-Up Procedure (continued)
CHECK PILOT BURNER
The pilot flame must surround the generator tip from 1/4 to 3/8-
inches. Pilot flame is preset at the factory, so ordinarily it does not
require field adjustment. (Figure 19). On new installations, the
gas lines will be filled with air and may take several minutes to
establish a pilot flame.
BURNER FLAME CHARACTERISTICS
Start the furnace and let it operate at least ten minutes. Open the
access door to view the burner flame. Limit your movements near
the furnace a few more minutes before making your final
observations. 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 20).
NORMAL APPEARANCE
Natural Gas:
1.
Inner cone
blue in color
3/8 to 5/8-inches above ports.
2.
Secondary inner cone
light blue in color
1 to 2-inches
above ports.
3.
Total flame
from blue in color to nearly invisible
approximately 6-inches above ports.
L.P Gas:
1.
Inner cone
blue in color
1/2 to 3/4-inches above ports.
2.
Secondary inner cone
light blue in color
1 to 2-inches
above ports.
3.
Total flame
from blue in color 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
:
Flame will not hold to ports
entire cone sections blow off from
noisy ports (too much pressure).
WARNING:
If flame appears abnormal, contact the
gas company or a qualified service technician
immediately.
FIGURE 19 – Check Pilot Burner
FIGURE 20 – Burner Flame Characteristics
