Harsco Industrial SC-2000 Installation & Owner's Manual page 35

Recommended Combustion Settings for SONIC Boilers
Table 3.11.2:
Fuel Nominal Gas Pressure
7" w.c.
Natural Gas
11" w.c.
Propane Gas
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
follows:
Open the front panel of the boiler. Locate the automatic gas
valve. 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. Increasing the gas
flow decreases the combustion exhaust
the gas flow increases the 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.
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
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
follows:
Open the front panel of the boiler. 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. Increasing
the gas concentration decreases the
There will be a slight time delay between the adjustment and the response of the
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.
3.11.3 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.
Harsco Industrial, Patterson-Kelley Technical Service 1.877.728.5351
High Fire Setting
% O
2
9.2
4.8 0.2
±
4.8 0.2 10.4
±
"Manual Control Firing Rate"
3.11.2, adjust as
Table
, while decreasing
O
2
measuring instrument. Adjust the
/O
2 2
"Manual Control Firing Rate"
3.11.2, adjust as
Table
, while decreasing the gas concentration increases the
O
2
Low Fire Setting
% CO % O % CO
2 2
0.1
5.0 0.2 9.1 0.1
± ± ±
0.3 5.0 0.2 10.3
± ± ±
Figure 3.11.2
, as
.
O
2
, as
35
2
0.3
measuring instrument.
CO /O
2 2
Gas Fired Boiler
.
O
2