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13) Run gas valve safety shutdown test:
• For standing pilot boiler models, disconnect the thermocouple from gas valve. Both pilot burner and main burners
should stop firing.
• For intermittent ignition boiler models, with main burners firing, disconnect ignition cable from ignition module.
Both pilot burner and main burners should stop firing.
15) Check the manifold pressure and adjust if necessary. To do this, use the following procedure:
a) Connect a manometer to the line pressure tap on the gas valve (see Figures 24 and 25).
b) Check the line pressure with all gas appliances on and off. The line pressure at the boiler must be within the following
limits regardless of what combination of appliances is firing:
Line Press (inches w.c.) Natural Gas LP Gas
Min. 5.0 11.0
Max. 14.0 13.0
If the line pressure falls outside of these limits, find and correct the cause of the problem before proceeding further.
c) Connect a manometer to the manifold (outlet) pressure tap on the gas valve (see Figures 24 and 25).
d) Read the manifold pressure. It should be set at:
Natural Gas LP Gas
Manifold Press. (inches w.c.) 3.5 10.0
e) If a manifold pressure adjustment is needed, make the adjustment by turning the regulator (see Figures 24 and 25)
screw clockwise to raise the pressure and counter clockwise to reduce the pressure. If a manifold pressure
adjustment is made, recheck the line pressure to be certain that it is still within acceptable limits. Replace the
cover screw on the regulator.
16) Test thermostat operation while the boiler is running. Turn the thermostat to the lowest setting. Circulator should stop
running. For standing pilot boiler models, pilot burner should remain lit but the main burners should stop firing. For
intermittent ignition boiler models both pilot burner and main burners should stop firing. Raise the thermostat back to the
highest setting. Circulator should restart. The main burners( for standing pilot boiler models) or pilot burner and main
burners (for intermittent ignition boiler models) should relight.
17) Verify high limit operation. Allow the boiler water temperature to increase to hi limit setting. Circulator should
continue running. For standing pilot boiler models, pilot burner should remain lit but the main burners should stop firing.
For intermittent ignition boiler models both pilot burner and main burners should stop firing.
18) Allow the boiler water temperature to drop below high limit setting.
19) The main burners (for standing pilot boiler models) or pilot burner and main burners (for intermittent ignition boiler
models) should relight.
WARNING
FAILURE TO FOLLOW THE FOLLOWING PROCEDURE EXACTLY COULD RESULT IN OVER-
FIRING OF THE BOILER AND A CARBON MONOXIDE HAZARD.
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