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A.
Gas Control System (continued)
2. Burner Adjustment
a) Erratic main burner flame s~utterina vellow:
1) Incorrect gas pressure
-
check for correct gas pressure coming through main burner orifice;
should be 11
"
WC.
2) Check for blockage or obstruction in main burner orifice. Remove and clean with alcohol
and compressed air. Do not enlarge orifice hole. Clean main burner if necessary.
3) Misalignment of main burner
-
check for correct alignment.
4)
Burner flashback
-
check main burner orifice. Must be properly seated into main burner
-
(straight in line with tube).
5 ) Sooting
-
can be caused by thermostat not shutting off completely or other obstructions or
blockage in flue box.
b) Main burner will not ianite:
1) Incorrect gas pressure
-
check for correct gas pressure coming through main burner orifice;
should be
1 1 "
WC.
2) Main burner orifice could be blocked
-
remove and clean with alcohol or compressed air. Do
not enlarge orifice hole.
3) Lint or dirt in burner tube
-
clean burner tube.
4)
Gas control valve defective
-
no gas flow through valve. Remove and replace.
UNITROL CONTROL
A-BURNER TUBE
B-AIR SHUTTER
C-GAS COCK
D-RESET BUTTON
E-PILOT ADJUSTMENT
F-TEMPERTURE
INDICATOR
G-SPRING
A-GAS COCK
B-TEMPERTURE
INDICATOR
C-PILOT ADJUSTMENT
D-BURNER TUBE
SIT
CONTROL
P ?
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