AERCO BMK 3.0 LN Dual-Fuel Series Gas Fired Low NOx Boiler System - Manual (Page 39)

INITIAL START-UP
4-7
9. Locate the Fuel Selector Switch on the front
of the unit behind the panel door (Figure 4-
3).
10. Set the ON/OFF switch on the unit control
panel to the ON position.
11. Access the Control Panel Configuration
Menu and change the Max Valve Position to
75%. (Refer to Chapter 3, para. 3.3 for
instructions on changing menu options).
12. Change the valve position to 29% using the
▲ arrow key. The unit should begin its start
sequence and fire.
13. Next, increase the valve position to 75%.
Verify that the gas pressure downstream of
the propane SSOV is 2.0” W.C. for both FM
and IRI gas trains. If gas pressure
adjustment is required, remove the brass
hex head cap on the propane SSOV (Figure
4-6). Make gas regulator adjustments using
a flat-tip screwdriver to obtain 2.0” W.C.
NATURAL
GAS SSOV
PROPANE
SSOV BALL
VALVE
PROPANE
INLET
NAT. GAS
INLET
BRASS HEX
HEAD CAP
(REMOVE TO
ADJUST
PROPANE
REGULATOR)
Figure 4-6
Regulator Adjustment Screw Location
14. With the valve position at 75%, insert the
combustion analyzer probe into the flue
probe opening and allow enough time for the
combustion analyzer to settle.
15. 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 at
75% Valve Position
Oxygen %
± 0.2
Carbon
Monoxide NOx
4.0 % <150 ppm <100 ppm
16. If the oxygen level is not within the specified
range, adjust the level using the up (▲) and
down (▼) arrow keys on the VFD. Using the
up (▲) arrow key will increase oxygen level
and the down (▼) arrow key will decrease
the oxygen level.
17. Once the oxygen level is within the specified
range at 75%, lower the valve position to
60%.
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 60%, 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.
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 C-More display.
20. Press the ▲ arrow key until SET Valve
Position appears on the C-MORE display.
21. Press the CHANGE key. SET Valve Position
will begin to flash.
22. Press the ▲ arrow key until the SET Valve
Position reads 60%. Press the ENTER key.
23. Next, press the down (▼) arrow key until
CAL Voltage 60% is displayed.
24. Press the CHANGE key and observe that
CAL Voltage 60% is flashing.
25. The oxygen level at the 60% 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.