Initial start-up – AERCO BMK 2.0 LN Dual Fuel Nov 2010 User Manual
Page 37
INITIAL START-UP
1. Open the water supply and return valves to
the unit and ensure that the system pumps
are running.
2. Open the natural gas supply valve(s) to the
unit.
3. Set the control panel ON/OFF switch to the
OFF
position.
4. Turn on external AC power to the unit. The
display will show LOSS OF POWER and the
time and date.
5. Set the unit to the Manual Mode by pressing
the AUTO/MAN key. A flashing Manual
Valve Position
message will be displayed
with the present valve position in %. Also,
the MANUAL LED will light.
6. Adjust the air/fuel valve position to 0% by
pressing the ▼ arrow key.
7. Ensure that the leak detection ball valve
down-stream of the SSOV is open.
8. Ensure that the Fuel Selector Switch located
behind the front door of the unit (Figure 4-3)
is in the NATURAL GAS position.
9. Set
the
ON/OFF
switch to the ON position.
10. Change the valve position to 34% using the
▲ arrow key. The unit should begin its start
sequence and fire.
11.
Next, verify that the gas pressure
downstream of the SSOV is 7.3” W.C. for
both FM and IRI gas trains. If gas pressure
adjustment is required, remove the brass
hex nut on the Natural Gas SSOV actuator
containing the gas pressure regulator
(Figure 4-4). Make gas regulator
adjustments using a flat-tip screwdriver to
obtain 7.3” W.C.
12. Increase the valve position to 100% and
verify that the gas pressure downstream of
the SSOV remains at 7.2” W.C. Readjust
pressure if necessary.
13. With the valve position at 100%, 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
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%
Valve Position
Inlet Air
Temp
Oxygen %
± 0.2
Carbon
Monoxide
NOx
>100°F
5.5 %
<100 ppm
<20 ppm
90°F
5.7 %
<100 ppm
<20 ppm
80°F
5.9 %
<100 ppm
<20 ppm
<70°F
6.0 %
<100 ppm
<20 ppm
FRONT VIEW
ADJUSTABLE
TEMPERATURE
LIMIT SWITCH
FUEL
SELECTOR
SWITCH
RESET BUTTON
FOR MANUAL
TEMPERATURE
LIMIT SWITCH
SEE
DETAIL “A”
DETAIL “A”
Figure 4-3
Front View With Door Removed
4-3