AERCO BMK 2.0 LN Dual Fuel Serial G-11-2402 and UP - Manual (Page 50)

CHAPTER 4: INITIAL START-UP
Page 50 of 160 PR2: 04/22/13
Benchmark 2.0LN Dual-Fuel Low NOx Boiler
Operation and Maintenance Manual
OMM-0052_0E
GF-127
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288
9. Set the Fuel Selector Switch (Figure 4-4) to the PROPANE position.
10. Set the ON/OFF switch to the ON position.
11.
Change the valve position to 34% using the ▲ arrow key. The unit should begin its start
sequence and fire.
12. Next, increase the valve position to 91%. Verify that the gas pressure downstream of the
Propane SSOV is 2.8” W.C. for both FM and IRI gas trains. If gas pressure adjustment is
required, remove the brass hex nut on the Propane SSOV actuator containing the gas
pressure adjustment (see Figures 4-1 & 4-3). For IRI gas trains, the gas pressure adjustment
is on the downstream SSOV. Make gas pressure adjustments using a flat-tip screwdriver to
obtain 2.8” W.C.
13. With the valve position at 91%, insert the combustion analyzer probe into the flue probe
opening and allow enough time for the combustion analyzer to settle.
14. Compare the measured oxygen % level to the range shown below. Also, ensure that the
carbon monoxide (CO) and nitrogen oxide (NOx) readings do not exceed the values shown.
Table 4-7: Combustion Oxygen Level for a
91%
Valve Position
Oxygen %
± 0.2
Carbon Monoxide
NOx
5.3 % <150 ppm <100 ppm
15. If necessary, adjust the iris air damper shown in Figure 4-5 until the oxygen level is within the
range specified above.
16. Once the oxygen level is within the specified range at 91%, 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 21% as
described in the following steps. These steps assume that the inlet air
temperature is within the range of 50°F to 100°F.
17. 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.
18. Press the MENU Key on the front panel of the C-MORE until Combustion Cal Menu appears
on the C-More display.
19.
Press the ▲ arrow key until SET Valve Position appears on the C-MORE display.
20. Press the CHANGE key. SET Valve Position will begin to flash.
21.
Press the ▲ arrow key until the SET Valve Position reads 80%. Press the ENTER key.
22.
Next, press the down (▼) arrow key until CAL Voltage 80% is displayed.
23. Press the CHANGE key and observe that CAL Voltage 80% is flashing.
24. 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.