AERCO BMK 2.0 LN Natural Gas (SN G-11-1861 and above) - Manual (Page 55)

GF-123
Benchmark 2.0LN Low NOx Boiler
Chapter 4
OMM-0046_0E I nstallation, Operation and Maintenance Manual Initial Start-Up
PR1 08/20/12 AERCO International Inc.● 100 Oritani Dr. ● Blauvelt, NY 10913. ● Ph: 800-526-0288 Page 55 of 170
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 air/fuel valve positions of 80%, 60%, 45%,
30% and 16% as described in the following steps. These steps
assume that the inlet air temperature is within the range of 50°F to
100°F.
16. 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.
17. Press the MENU key on the front panel of the C-MORE until Combustion Cal Menu appears
on the C-More display.
18.
Press the ▲ arrow key until SET Valve Position appears on the C-MORE display.
19. Press the CHANGE key. SET Valve Position will begin to flash.
20.
Press the ▲ arrow key until the SET Valve Position reads 80%. Press the ENTER key.
21.
Next, press the down (▼) arrow key until CAL Voltage 80% is displayed.
22. Press the CHANGE key and observe that CAL Voltage 80% is flashing.
23. The oxygen level at the 80% valve position should be as shown below. Also, ensure that the
carbon monoxide (CO) and nitrogen oxide (NOx) readings do not exceed the values shown.
Table 4-2: Combustion Oxygen Levels for a
80% Air/Fuel Valve Position
Oxygen %
± 0.2
Carbon Monoxide NOx
5.2 % <100 ppm <30 ppm
24.
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.
25. 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.
NOTE
The remaining steps basically repeat the procedures in steps 18 through
25 for valve positions of 60%, 45%, 30% and 16%. However, since oxygen
levels vary, these steps are repeated in their entirety. When performing
these steps, also ensure that the carbon monoxide (CO) and nitrogen oxide
(NOx) readings do not exceed the values shown for each valve position.
26.
Press the ▲ arrow key until SET Valve Position appears on the C-MORE display.
27. Press the CHANGE key. SET Valve Position will begin to flash.
28.
Press the ▼ arrow key until the SET Valve Position reads 60% and press the ENTER key.
29.
Press the down ▼ arrow key until CAL Voltage 60% is displayed.
30. Press the CHANGE key. CAL Voltage 60% will begin to flash.