AERCO BMK 3.0 LN Dual-Fuel Series Gas Fired Low NOx Boiler System - Manual (Page 38)

INITIAL START-UP
4-6
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 18%, then press the ENTER
key.
54. Press the ▼ arrow key until CAL Voltage
18% is displayed.
55. Press the CHANGE key. CAL Voltage 18%
will begin to flash.
56. The oxygen level at the 18% 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
18% Valve Position
Oxygen %
± 0.2
Carbon
Monoxide NOx
6.5 % <50 ppm <30 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 18%, press the ENTER key to store
the selected blower output voltage for the
18% valve position.
IMPORTANT
Repeat steps 18 through 58 until the
blower output voltage does not require
adjustment when sequencing from 85% to
18%.
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 3.0 Dual Fuel Boiler is
combustion calibrated at the factory prior to
shipping. 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.
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 valve position in %. Also,
the MANUAL LED will light.
6. Adjust the valve position to 0% by pressing
the ▼ arrow key.
7. Ensure that the leak detection ball valve
(Figure 4-1) downstream of the propane
SSOV is open.
8. Ensure that the Fuel Selector Switch (Figure
4-3 is in the PROPANE position.