Instruction Manual

Benchmark 750/1000 Boiler Installation, Operation & Maintenance Manual
CHAPTER 4 – INITIAL START-UP
Page 60 of 192 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0082_0J
05/21/2014 Ph.: 800-526-0288 GF-130
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 values
shown, 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.
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 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:
Natural Gas Combustion Calibration Readings
Valve Position Oxygen (O
2
) %
Nitrogen Oxide
(NOx)
Carbon Monoxide
(CO)
80% 5% - 6% <20 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.