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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/no 2.5 allen wrench,
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
level, adjust towards the "+" symbol to increase gas flow.
the O
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: 2.5 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 1%. 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 2 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 ¼
turn at a time before allowing the readings to respond and stabilize.
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 8-25V.
Revised: October 2, 2019
Released: October 2, 2019
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 2019
All Rights Reserved.
P-K Storm
Technical Service 1.877.728.5351
level,
2
table, adjust
/O
level.
2
2
Offset adjustment
2691000099 P-K Storm Installation and Owners
TM
Gas Fired Boiler
Manual.docx
Page 46
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