AERCO BMK 2.0 LN Natural Gas (SN G-11-1861 and above) - Manual (Page 59)

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 59 of 170
Table 4-7: Combustion Oxygen Levels for a
100%
Valve Position
Oxygen %
± 0.2
Carbon Monoxide
NOx
4.8 % <100 ppm <100 ppm
14. If necessary, adjust the iris air damper shown in Figure 4-4 until the oxygen level is within
the range specified in Table 4-2.
15. Once the oxygen level is within the specified range at 100%, lower the valve position to
80%.
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 20% 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 4-8: Combustion Oxygen Level at
80%
Valve Position
Oxygen %
± 0.2
Carbon Monoxide NOx
5.0 % <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.