AERCO BMK 3.0 LN Dual Fuel APRIL 2009 - Manual (Page 35)

INITIAL START-UP
8. Ensure that the Fuel Selector Switch (Figure
4-3 is in the NATURAL GAS position.
9. Locate the Variable Frequency Drive (VFD)
on the front of the unit behind the panel door
(Figure 4-3). Insert the “LogicStick” with the
“NATURAL GAS” label in the slot on the
front of the VFD.
10. Set the ON/OFF switch on the unit control
panel to the ON position.
POWER
BOX
CONTROL
PANEL
I/O BOX
TRANSFORMER
(460 VAC UNITS ONLY)
VFD
FUEL
SELECTOR
SWITCH
Figure 4-3
Front View With Door Removed
11. Access the control panel Configuration
Menu and ensure that the Max Fire Rate is
set to 100%. (Refer to Chapter 3, para. 3.3
for instructions on changing menu options).
12. Change the fire rate to 29% using the ▲
arrow key. The unit should begin its start
sequence and fire.
13. Next, increase the fire rate to 100%. Verify
that the gas pressure downstream of the
SSOV is 5” W.C. for both FM and IRI gas
trains. If gas pressure adjustment is
required, remove the brass hex head cap on
the SSOV (Figure 4-4). Make gas regulator
adjustments using a short, flat-tip
screwdriver to obtain 5” W.C.
Figure 4-4
Regulator Adjustment Screw Location
14. With the firing rate at 100%, 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
oxygen range for the inlet air temperature
shown in Table 4-1. Also, ensure that the
carbon monoxide (CO) and nitrogen oxide
(NOx) readings do not exceed the values
shown.
Table 4-1
Combustion Oxygen Levels for a 100%
Firing Rate
Inlet Air
Temp
Oxygen %
± 0.2
Carbon
Monoxide NOx
>100°F 4.8 % <100 ppm <30 ppm
90°F 5.0 % <100 ppm <30 ppm
80°F 5.2 % <100 ppm <30 ppm
<70°F 5.3 % <100 ppm <30 ppm
4-3