AERCO BMK 1500-2000 - Manual (Page 59)

Benchmark 1500 - 2000 Boilers
CHAPTER 4 – INITIAL START-UP
OMM-0097_0D AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 59 of 188
GF-142
Ph.: 800-526-0288
BMK 2000 Natural Gas Combustion Calibration (Cont.)
15. If the oxygen level is not within the required tolerance, the gas pressure on the
downstream side of the SSOV must be adjusted using the gas pressure adjustment
screw on the SSOV (Figure 4-3). Slowly rotate the gas pressure adjustment
(approximately 1/4-turn increments). Allow the combustion analyzer to stabilize following
each adjustment. Clockwise rotation reduces the oxygen level, while counterclockwise
rotation increases the oxygen level.
16. Once the oxygen level is within the specified range at 100%, record the O
2
, NOx and CO
readings on the Combustion Calibration Data Sheets provided with the unit.
17. Lower the valve position to 80%
using the ▼arrow key.
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%, 50%, 40%, 30%
and 14% 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 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 the 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:
Combustion Calibration Readings @ 80% Valve Position
Valve Position Oxygen (O
2
) % Nitrogen Oxide (NOx) Carbon Monoxide (CO)
80% 5.9% ± 0.5%
≤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.