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3. On each of the gas control valves turn clockwise or counterclockwise to achieve the desired
CO
or O
level; see table for Combustion Exhaust Settings for correct settings.
2
2
There will be a time delay between the adjustment and the response of the CO
analyzer.
4. Adjust the settings in small increments. When desired adjustments are complete, reinstall the
blue plastic cap on the gas valve.
There will be a slight time delay between the adjustment and the response of the
instrument. Adjust the settings in small increments and allow the combustion readings to stabilize
before readjusting. When desired adjustments are complete, check and adjust low fire if
Adjusting Low Fire (C750-C900-C1050 (All Models))
Start the boiler and observe proper operating parameters for the system. Set boiler to the "Manual
Control Firing Rate", as described above, 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 with Table of Combustion Exhaust Settings, adjust as follows:
1. Remove the gray cap on the gas regulator using a slotted screwdriver. This will expose the low
fire adjustment screw.
2. Using a TORX T40, adjust the low fire screw on the pressure regulator (see the figure above) to
achieve the correct CO
3. Adjustments to low fire should not exceed ¼ turn at a time before allowing the readings to
respond and stabilize. Clockwise rotation increases gas flow. Counterclockwise rotation
decreases gas flow.
4. After the low fire adjustment is made, reinstall the slotted cap on the regulator.
The rotation of the Low Fire adjustment screw is opposite to the High Fire adjustment screw.
Following all gas valve adjustments, check for proper light-off and verify correct fuel/air mix and
combustion quality throughout the entire firing range (from low fire to high fire).
3.11.4 Checking Flame Signal
Press the "Info" button on the NURO touch screen to load the Information Screen and scroll down to
view the flame signal measured in Volts. Typical flame signals should read between 20-50V. If the
flame signal is below 20V, the ignition electrode may need to be replaced.
Revised: January 3, 2020
Released: January 3, 2020
N
OTICE
/O
level.
2
2
N
OTICE
Patterson-Kelley 2020
All Rights Reserved.
P-K MACH
Technical Service 1.877.728.5351
!
!
1004905980 P-K MACH CM300-CM500&C750-C1050
Installation and Owners Manual (Rev F Jan-2020).docx
®
Gas Fired Boiler
/O
combustion
2
2
measuring
CO
/O
2
2
necessary.
Page 48
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