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The pilot flame is blue and goes toward the main burner and thermopile
horizontally. A slight yellow tip on the flame is normal. The pilot
flame must surround and extend approximately 1/4" (6mm) beyond
the thermopile, and must extend beyond the first row toward the
second row of main burner ports.
THERMOPILE
PILOT
FLAME
PILOT ASSEMBLY
MAIN BURNER
CARRYOVER PORTS
Figure 7
PILOT FLAME CHARACTERISTICS
1. Lit match goes out as it enters lighter port.
a. Certain wind conditions will blow out match. Ignite
match, and as it flares, thrust match through opening.
b. Open nearby door or window and relight pilot.
2. Pilot flames but goes out when knob is released.
a. See Lighting Instructions. Relight Pilot.
b. Relight the pilot and hold knob down longer and harder.
Close lighter hole cover just after igniting. Check for a
good pilot flame.
c. Defective thermopile or defective magnet in safety section
of valve. Replace.
3. Yellow pilot flame.
a. Obstruction at pilot orifice.
b. Clean and properly size orifice.
4. Pilot and main burner go out during normal operation.
a. Check millivolts.
b. Check for proper size of pilot flame.
c. Check for defective or weak thermopile.
d. Check input, reduce as needed.
e. Cover on pilot lighter hole must be air tight.
f. Check for tight fit of air and flue tubes at both ends of vent
assembly. No obstruction around vent that would prevent
the wind from hitting all of the vent equally.
5. Yellow main burner flame soot on the vent cap.
a. Remove main burner to check for obstructions in throat,
ports and orifices.
b. Install new main burner orifice and pilot orifice. Refer to
Parts List on Page 14.
TROUBLESHOOTING
On the main burner, the burning gas forms a primary flame and a
secondary flame. The primary flame is blue and about 3/16" (5mm)
high. The secondary flame is very pale blue, 3 inches (76mm) to
5 inches (127mm) high. Dust in the combustion air will produce
an orange flame. Do not mistake it for an improper yellow flame.
PRIMAR
Y
FLAME
SECONDAR
Y
FLAME
Figure 8
MAIN BURNER FLAME CHARACTERISTICS
