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GF-127
OMM-0052_0E
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 the 20% valve position.
59. This completes the natural gas combustion calibration procedure.
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.
Adjust the valve position to 0% by pressing the ▼ arrow key.
7.
8.
Ensure that the leak detection ball valve (Figure 4-1) down-stream of the SSOV is open.
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288
PR2: 04/22/13
Benchmark 2.0LN Dual-Fuel Low NOx Boiler
Operation and Maintenance Manual
Oxygen %
Carbon Monoxide
± 0.2
8.8 %
IMPORTANT!
NOx
<50 ppm
<20 ppm
CHAPTER 4: INITIAL START-UP
Page 49 of 158
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