AERCO BMK 1.5 LN Dual Fuel Feb 2013 - Manual (Page 52)

CHAPTER 4: INITIAL START-UP
Page 52 of 162 PR2: 05/09/12
Benchmark 1.5LN Dual-Fuel Low NOx Boiler
Operation and Maintenance Manual
OMM-0041_0C
GF-121
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288
56. Press the ▼ arrow key until CAL Voltage 16% is displayed.
57. Press the CHANGE key. CAL Voltage 16% will begin to flash.
58. The oxygen level at the 16% 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.
Table 4-1: Combustion Oxygen Levels for a 16% Air/Fuel Valve
Position
Oxygen %
± 0.2
Carbon Monoxide NOx
8.0 % <50 ppm <30 ppm
59. 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.
60. Once the oxygen level is within the specified range at 16%, press the ENTER key to
store the selected blower output voltage for the 16% valve position.
61. 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.
4.5 PROPANE COMBUSTION CALIBRATION
The Benchmark 1.5LN 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.
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 down-stream of the Propane SSOV (Figure
4-1) is open.