Crown Boiler 32 - Manual (Page 53)

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WARNING
FAILURE TO FOLLOW THE FOLLOWING PROCEDURE EXACTLY COULD RESULT
IN OVER-FIRING OF THE BOILER AND A CARBON MONOXIDE HAZARD.
13) Check the manifold pressure and adjust if necessary. To do this, use the following procedure:
a. Connect a manometer to the inlet pressure tap on the gas valve (see Figures 39 - 41).
b. Check the inlet pressure with all gas appliances on and off. The inlet pressure at the inlet of each gas valve
must be within the following limits regardless of what combination of appliances is firing:
Inlet Press (inches w.c.) Natural Gas
Min. 5.0
Max. 14.0
If the inlet 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 on the first base module. See
Figures 39 - 41.
d. Read the manifold pressure. It should be set at 3.5 inches w.c..
e. If a manifold pressure adjustment is needed, make the adjustment by turning the pressure regulator (see Figures
39 - 41) screw clockwise to raise the pressure and counter clockwise to reduce the pressure. If a manifold
pressure adjustment is made, recheck the line pressure at each base module to be certain that it is still within
acceptable limits. Replace the cover screw on the regulator.
f. Repeat steps a - e for the remaining base modules.
14) Test thermostat operation while the boiler is running. Turn the thermostat to the lowest setting. Both pilot
burner and main burners should stop firing. Raise the thermostat back to the highest setting. The pilot burner and
main burners should relight.
15) (Water Boilers) - Verify high limit operation. Allow the boiler water temperature to increase to high limit setting.
The burners should shut down and the circulator continue running. Allow the boiler water temperature to drop
below high limit setting. The pilot burner and main burners should relight.
Figure 37: Pilot Burner Flame Figure 38: Main Burner Flame