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6 CHECK PILOT FLAME. Flame should be a blue
medium hard fl ame enveloping approximately 3/8” of
the end of the sensing probe, see Figure 14.
7 CHECK THERMOSTAT OPERATION. Raise and
lower thermostat setting as required to start and stop
burners.
8 CHECK HIGH LIMIT CONTROL. Allow boiler to
operate until burners are shut down by limit control
(approximately 235°F). If burners are not shut down by
limit control, determine cause of malfunction. Replace
control if necessary and check its operation.
9 CHECK IGNITION SYSTEM SAFETY SHUTOFF
DEVICE. Remove pilot ground lead from electrical
junction block. If burners are not shut down by
module, determine cause of malfunction. Replace
module or gas valve if necessary.
10 MAIN BURNER FLAMES should have a clearly
defi ned inner cone, see Figure 15, with no yellow
tipping. Orange-yellow streaks caused by dust should
not be confused with true yellow tipping.
11 CHECK LWCO OPERATION (if so equipped). Drain
boiler water below LWCO set point. Burners should
shutdown. If burners do not shut down determine cause
of malfunction and repair.
12 WARNING – BEFORE INSTALLATION OF THE
BOILER IS CONSIDERED COMPLETE, THE
OPERATION OF THE BOILER CONTROLS
SHOULD ALL BE CHECKED, PARTICULARLY
THE LOW WATER CUT-OFF AND THE HIGH
LIMIT CONTROL.
Figure 15
MAIN BURNER FLAME
Figure 14
TYPICAL PILOT FLAME