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3.11 Fuel/Air Adjustments
®
The P-K Storm
boilers are equipped with a gas/air ratio
control valve and a gas safety shut off control valve,
combined into one valve assembly. The valve functions
in series with the variable speed combustion blower to
supply the correct gas/air mixture for optimum firing
performance and efficiency. The combustion blower
speed is controlled automatically by the boiler controller.
The blower speed determines the amount of air flow
and the amount of suction/negative pressure at the gas
valves. The gas valve adjusts gas flow to maintain the
proper delivery pressure at the outlet of the valve.
Gas Pressure Adjustment
See rating plate for the minimum and maximum gas
pressure of the boiler. The supply pressure during main
burner operation must be greater than the minimum
indicated on the rating plate. Nominal gas supply
pressure is 7" W.C. for natural gas. The gas pressure
must not exceed 14" W.C. which is the maximum
allowable pressure on the gas train components. Each boiler is furnished with a manual shut-off valve
which has an integrated test port. This port is located on the upstream side of the valve body for
measuring supply pressure.
The air flow is pre-set at the factory prior to shipment. Gas flow is dependent primarily on fan speed
not upstream gas pressure. The automatic gas valve may have to be adjusted to obtain proper
combustion readings for specific local conditions. A combustion analyzer must be used. Combustion
must be set in accordance with Recommended Combustion Settings for P-K Storm Boilers in
3.11.2.
Revised: February 2, 2024
Released: February 2, 2024
Patterson-Kelley 2024
All Rights Reserved.
P-K Storm
Technical Service 1.877.728.5351
Gas Valve
2691000403 P-K Storm ST2500-ST8000
Installation and Owners Manual Rev G.docx
®
Gas Fired Boiler
Section
Page 57
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