AERCO BMK 2.0 LN Dual Fuel Nov 2010 - Manual (Page 40)

INITIAL START-UP
Combustion Oxygen Level at
30% Valve Position
Oxygen %
± 0.2
Carbon
Monoxide NOx
8.4 % <50 ppm <20 ppm
49. 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
▼ arrow key decreases the oxygen level.
50. Once the oxygen level is within the specified
range at 30%, press the ENTER key to store
the selected blower output voltage for 30%
valve position.
51. Press the ▲ arrow key until SET Valve
Position appears on the C-MORE display.
52. Press the CHANGE key. SET Valve Position
will begin to flash.
53. Press the ▼ arrow key until the SET Valve
Position reads 20%, then press the ENTER
key.
54. Press the ▼ arrow key until CAL Voltage
18% is displayed.
55. Press the CHANGE key. CAL Voltage 20%
will begin to flash.
56. The oxygen level at the 20% 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
20% Valve Position
Oxygen %
± 0.2
Carbon
Monoxide NOx
8.8 % <50 ppm <20 ppm
57. 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
▼ arrow key decreases the oxygen level.
58. Once the oxygen level is within the specified
range at 20%, press the ENTER key to store
the selected blower output voltage for 20%
valve position.
59. This completes the Natural Gas combustion
calibration procedure.
IMPORTANT
Refer to Appendix K for switchover
instructions when changing from Natural
Gas to Propane or from Propane to
Natural Gas.
4.4 PROPANE COMBUSTION
CALIBRATION
The Benchmark 2.0LN Dual-Fuel Boiler is
combustion calibrated at the factory prior to
shipping. However, recalibration as part of initial
start-up is necessary due to changes in the local
altitude, gas BTU content, gas supply piping and
supply regulators. Factory Test Data sheets are
shipped with each unit. These sheets must be
filled out and returned to AERCO for proper
Warranty Validation.
Prior to starting these procedures, ensure that
the Benchmark 2.0LN Dual-Fuel Boiler has been
set up as specified in paragraphs 4.2 through
4.2.3.
It is important to perform the following procedure
as outlined. This will keep readjustments to a
minimum and provide optimum performance.
1. Open the water supply and return valves to
the unit and ensure that the system pumps
are running.
2. Open the propane 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 rate in %. Also, the
MANUAL
LED will light.
6. Access the Control Panel Configuration
Menu and ensure that the Fuel Type is set
to Propane.
7. Adjust the valve position to 0% by pressing
the ▼ arrow key.
8. Ensure that the leak detection ball valve
(Figure 4-1) down-stream of the SSOV is
open.
4-6