Instruction Manual

Benchmark 750/1000 Boiler Installation, Operation & Maintenance Manual
APPENDIX M – ULTRA-LOW NOx CALIBRATION
OMM-0082_0J AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 187 of 192
GF-130 Ph.: 800-526-0288 05/21/2014
Ultra-Low NOx Natural Gas Combustion Calibration – Continued
NOTE
The remaining combustion calibration steps are performed using the
Combustion Cal Menu included in the C-More Control System. The combustion
calibration control functions will be used to adjust the oxygen level (%) at valve
positions of 80%, 60%, 45%, 30% and 18% as described in the following steps.
These steps assume that the inlet air temperature is within the range of 50°F to
100°F. If NOx readings exceed the target value of 9 ppm, increase the O
2
level
up to 1% higher than the listed calibration range. Record the increased O
2
value
on the Combustion Calibration sheet.
17. Lower the valve position to 80% using the ▼arrow key.
18. Press the MENU key on the front panel of the C-MORE and access the Setup menu. Enter
password 6817 and then press the ENTER key.
19. Press the MENU key on the front panel of the C-MORE until Combustion Cal Menu
appears on the display.
20. Press the ▲ arrow key until SET Valve Position appears on the display.
21. Press the CHANGE key. SET Valve Position will begin to flash.
22. Press the ▲ arrow key until SET Valve Position reads 80%. Press the ENTER key.
23. Next, press the
down (▼) arrow key until CAL Voltage 80% is displayed.
24. Press the CHANGE key and observe that CAL Voltage 80% is flashing.
25. The oxygen level at the 80% valve position should be as shown below. Also, ensure that the
nitrogen oxide (NOx) and carbon monoxide (CO) readings do not exceed the following
values:
Ultra-Low NOx Combustion Calibration Readings
Valve Position Oxygen (O
2
) %
Nitrogen Oxide
(NOx)
Carbon Monoxide
(CO)
80%
5% - 7%
<9 ppm
<100 ppm
26. If the oxygen level is not within the specified range, adjust the level using the ▲ and ▼
arrow keys. This will adjust the output voltage to the blower motor as indicated on the
display. Pressing the ▲ arrow key increases the oxygen level and pressing the down ▼
arrow key decreases the oxygen level.
27. Once the oxygen level is within the specified range at 80%, press the ENTER key to store
the selected blower output voltage for the 80% valve position. Record all readings on the
Combustion Calibration Sheets provided.
28. Repeat steps 20 through 27 for valve positions of 60%, 45%, 30% and 18%* (see *NOTE
below). The oxygen (O
2
), nitrogen oxide (NOx) and carbon monoxide (CO) should remain
within the same limits for all valve positions as shown in the following table.
*NOTE
Set the Valve Position at 18% but make adjustments to the Combustion
Calibration value designated as 16%.