P-K SONIC
TM
Gas Fired Boiler
T
T
T
Technical Service 1.877.728.5351
echnical Service 1.877.728.5351
echnical Service 1.877.728.5351
echnical Service 1.877.728.5351
3.12.4 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”
, 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 the above table
, adjust as follows:
1.
Open the front panel of the
boiler.
2.
Locate the automatic gas valve. Turn the offset screw, located in the bottom center of the side of the
valve, in the direction indicated on the label to increase or decrease the gas.
3.
Increasing the gas concentration decreases the
O
2
, while decreasing the gas concentration increases
the
O
2
.
There will be a slight time delay between the adjustment and the response of the
CO
2
/O
2
measuring
instrument. Adjust the settings in small increments and allow the combustion readings to stabilize before
readjusting. When desired adjustments are complete, check and adjust High Fire if necessary.
3.12.5 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 20-50V.
