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Adjusting High Fire
NOTE: ALWAYS adjust high fire combustion first!
Start the boiler and observe proper operating parameters for the system.
Access the "Manual Control Firing Rate", as described above, and
increase the firing rate to 100%. Check combustion readings using the
combustion analyzer. If the combustion readings are not in accordance
with Section 3.11.2, adjust as follows:
Required Tools: Flat head screwdriver, Combustion analyzer and
water tube manometer.
1. Using a slotted screw driver, set the maximum restrictor (high fire
screw) on the outlet/shutter flange of the combination gas safety
shut off / control valve by turning clockwise or counterclockwise to
achieve the desired CO
adjust towards the "-" symbol to decrease gas flow. To decrease
the O
level, adjust towards the "+" symbol to increase gas flow.
2
2. There will be a slight time delay between the adjustment and the
response of the CO
decreases gas flow. Counterclockwise rotation increases gas flow.
Adjusting Low Fire
Required Tools: 4 mm hex wrench and combustion analyzer.
Start the boiler and observe proper operating parameters for the system.
Set boiler to the
Manual Control Firing Rate
"
and decrease the firing rate to 0%. Once the boiler has reached low fire
operation, check combustion readings using the combustion analyzer. If
combustion readings are not in accordance
as follows:
1. Using a 4 mm hex wrench, adjust the pressure regulator offset
adjustment (pictured above) to achieve the desired CO
To increase the O2 level, adjust towards the "-" symbol to decrease
gas flow. To decrease the O2 level, adjust towards the "+" symbol
to increase gas flow.
2. Adjustments to the offset pressure regulator should not exceed 1/2
of a hash mark turn at a time before allowing the readings to
respond and stabilize. (NOTE: Offset adjustment is extremely
sensitive, make small adjustments).
Following all gas valve adjustments, check for proper light-off and verify
correct fuel/air mix and combustion quality throughout the entire firing rate
(from low to high fire).
Checking Flame Signal
Touch the "Info" button in the lower left corner of the NURO display to load
the "Information" menu which shows real-time read-only boiler values such
as temperatures, relay states, etc. Scroll down the "Information" menu to
find the "Flame Signal" value. This value displays the strength of the combustion flame (units = V) as
measured by the ignition electrode/ionization probe. When the boiler is in standby, prepurge, or
postpurge the flame signal should read 0V. During main flame, a strong flame signal should read
between 8-30V.
Revised: February 2, 2024
Released: February 2, 2024
or O
level. To increase the O
2
2
/O
measuring instrument. Clockwise rotation
2
2
mode, as described above,
"
with the above
Patterson-Kelley 2024
All Rights Reserved.
P-K Storm
Technical Service 1.877.728.5351
level,
2
Offset adjustment
table, adjust
/O
level.
2
2
2691000403 P-K Storm ST2500-ST8000
Installation and Owners Manual Rev G.docx
®
Gas Fired Boiler
Page 59
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