AERCO BMK 3.0 LN Dual-Fuel Series Gas Fired Low NOx Boiler System - Manual (Page 36)

INITIAL START-UP
4-4
15. If necessary, adjust the iris air damper
shown in Figure 4-5 until the oxygen level is
within the range specified in Table 4-1.
16. Once the oxygen level is within the specified
range at 100%, lower the valve position to
85%.
IRIS AIR
DAMPER
AIR INLET
BLOWER
AIR/FUEL
VALVE
A A
USE 1 /2"
WRENCH TO
INCREASE (CW)
OR DECREASE
(CCW) INLET AIR
IRIS ADJUSTMENT
VIEW A - A
Figure 4-5
Iris Air Damper Location/Adjustment
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 85%, 65%, 45%, 30% and 18% 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 85%. Press the ENTER key.
22. Next, press the down (▼) arrow key until
CAL Voltage 85% is displayed.
23. Press the CHANGE key and observe that
CAL Voltage 85% is flashing.
24. The oxygen level at the 85% 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
85% Valve Position
Oxygen %
± 0.2
Carbon
Monoxide NOx
6.0 % <100 ppm <30 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 85%, press the ENTER key to store
the selected blower output voltage for the
85% valve position.
NOTE
The remaining steps basically repeat the
procedures in steps 20 through 27 for valve
positions of 65%, 45%, 30% and 18%. 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.