AERCO BMK 2.0 LN Dual Fuel Nov 2010 - Manual (Page 41)

INITIAL START-UP
9. Set the Fuel Selector Switch (Figure 4-3) 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 regulator (see
Figures 4-1 & 4-3). For IRI gas trains, the
regulator is on the downstream SSOV. Make
gas regulator 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.
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 4-4 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.
Combustion Oxygen Level at
80% Valve Position
Oxygen %
± 0.2
Carbon
Monoxide NOx
4.8 % <150 ppm <100 ppm
25. 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.
26. Once the oxygen level is within the specified
range at 80%, press the ENTER key to store
the selected blower output voltage for 80%
valve position.
NOTE
The remaining steps basically repeat the
procedures in steps 19 through 26 for
valve positions of 60%, 45%, 30% and
21%. 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.
4-7