Product Overview

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16) 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 Figure 25).
b) Check the inlet pressure with all gas appliances on and off. The inlet pressure at the boiler must be within the
followinglimitsregardlessofwhatcombinationofappliancesisring:
Inlet Press (inches w.c.) Natural Gas LP Gas
Min. 5.0 11.0
Max. 14.0 13.0
 Iftheinletpressurefallsoutsideoftheselimits,nd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 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 pressure regulator (see Figure
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.
WARNING
FAILURE TO FOLLOW THE FOLLOWING PROCEDURE EXACTLY COULD RESULT IN OVER-
FIRING OF THE BOILER AND A CARBON MONOXIDE HAZARD.
Figure 22: INTERMITTENT IGNITION PILOT BURNER FLAME
XI. System Start-up (continued)