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3.12.2 Combustion Setup and Adjustment
To adjust/tune combustion, use the NURO's "Manual Control Firing Rate" mode. To access, touch the "Info"
button in the lower left corner of the screen, and then touch "Service" in the lower left. Next, touch "Press to
Activate Manual Control" which will open the "Manual Control Firing Rate" mode. This test mode should be
used when adjusting or tuning the gas safety shut off/control valve on the
In this mode a heat request is required. Once the boiler cycles on and is running in "Manual Control Firing
Rate", use the UP and DOWN arrow keys or the slider to force the boiler to operate at low fire or high fire (or
anywhere in-between). To prevent the boiler from cycling off prematurely during adjustment, ensure that any
load devices (air handlers, control valves, radiators, etc.) are in operation and able to shed/dump the heat
load created by the boiler.
Recommended Combustion Settings for P-K MACH® Boilers
Fuel
Nominal Gas Pressure
Natural Gas
7" w.c.
Propane Gas
11" w.c.
3.12.3 Adjusting High Fire
Required Tools: Flat head screwdriver and combustion analyzer.
Start the boiler and observe proper operating parameters for
the system. Set boiler to the
described above, and increase the firing rate to 100%.
Check combustion readings using the combustion analyzer.
If combustion readings do not agree with the above table,
adjust as follows:
1. Open the front panel of the boiler.
2. Locate the automatic gas valve.
3. Turn the orifice adjusting screw, located on the
downstream side of the valve, in the direction indicated
on the sticker to increase or decrease the gas flow.
4. Increasing the gas flow decreases the combustion
exhaust
, while decreasing the gas flow increases the
O
2
combustion exhaust
There will be a slight time delay between the adjustment and
the response of the
CO
settings in small increments and allow the combustion
readings to stabilize before readjusting. When desired
adjustments are complete, check and adjust low fire if
necessary.
High Fire Setting
% O
2
4.8
0.2
±
4.8
0.2 10.4
±
"Manual Control Firing Rate"
.
O
2
measuring instrument. Adjust the
/O
2
2
T T T T echnical Service 1.877.728.5351
echnical Service 1.877.728.5351
echnical Service 1.877.728.5351
echnical Service 1.877.728.5351
Low Fire Setting
% CO
% O
% CO
2
2
9.2
0.1
5.0
0.2
9.1
±
±
±
0.3 5.0
0.2 10.3
±
±
±
, as
TM
P-K SONIC
Gas Fired Boiler
C750-C900-C1050
2
0.1
0.3
boilers.
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