P-K Storm
TM
Gas Fired Boiler
Technical Service 1.877.728.5351
Revised: October 2, 2019
Released: October 2, 2019
Patterson-Kelley 2019
All Rights Reserved.
2691000099 P-K Storm Installation and Owners
Manual.docx
Page 44
gas cock, 10012:
“Low Gas Limit”
will remain on the NURO display until the boiler is manually reset
by pressing “Reset Control”.
High Gas Pressure Switch
The boiler is furnished with a high gas pressure switch, installed near the boiler’s main gas
shutoff/control valve. The operation of this switch must be checked as follows:
1. Before starting the boiler, close the
downstream gas cock located inside the boiler’s enclosure.
2. Cycle the boiler on by generating a heat request.
3. Allow the boiler to proceed through prepurge and attempt ignition.
When the main gas shutoff/control valve opens to attempt ignition, the high gas pressure switch will trip,
causing the NURO touchscreen to display 10011:
“High Gas Limit”
. Even after re-opening the
downstream gas cock inside the boiler, 10011:
“High Gas Limit”
will remain on the NURO display until
the boiler is manually reset by pressing “Reset Control”.
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 Section
3.11.2.
NOTE
Make sure to re-open the downstream gas cock (inside the boiler) after a successful test.
Gas Valve
NOTE
Make sure to re-open the main gas cock (external to the boiler) after a successful test.
