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Benchmark 2500DF-3000DF Installation, Operation & Maintenance Manual
4.3 NATURAL GAS COMBUSTION CALIBRATION
The Benchmark boiler is combustion calibrated at the factory prior to shipping. For both the BMK 3000DF
and 2500DF, the gas pressure must be within the range of 6.0" W.C. ± 0.2" W.C. 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. Combustion Calibration 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. Set the control panel ON/OFF switch to the OFF position
3. Turn on external ac power to the unit. The display will show loss of power and the time
and date.
4. 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 position in %. Also, the
MANUAL LED will light.
5. Adjust the air/fuel valve position to 0% by pressing the ▼ arrow key.
6. Ensure that the leak detection ball valve downstream of the SSOV is open.
7. Set the ON/OFF switch to the ON position.
8. Change the valve position to 30% using the ▲ arrow key. The unit should begin its start
sequence and fire.
9. Next, verify that the gas pressure downstream of the SSOV is set to 6.0 ± 0.2" W.C. If gas
pressure adjustment is required, remove the brass hex nut on the SSOV actuator to
access the gas pressure adjustment screw (Figure 4-3). Make gas pressure adjustments
using a flat-tip screwdriver to obtain a gas pressure of 6.0" W.C. ± 0.2" W.C.Is
Figure 4-3: Gas Pressure Adjustment Screw Location
Page 56 of 234
05/21/2014
CHAPTER 4 – INITIAL START-UP
.
Natural Gas Combustion Calibration
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
Phone: 800-526-0288
BRASS HEX HEAD
(Remove to access the Gas
Pressure Adjustment Screw)
OMM-0099_0A
GF-145
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