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Benchmark 2500DF-3000DF Installation, Operation & Maintenance Manual
NATURAL Gas Combustion Calibration - Continued
BMK 3000DF NATURAL GAS Combustion Calibration Readings
Valve Position
65%
45%
30%
14%
BMK 2500DF NATURAL GAS Combustion Calibration Readings
Valve Position
45%
30%
20%
16%
28. If the oxygen level is too high at the 14% valve position (for the BMK 3000DF) or 16%
position (for the BMK 2500DF) and the Blower voltage is at the minimum value, you can
adjust the idle screw (TAC valve) which is recessed in the top of the Air/Fuel Valve (see
Figure 4-4). Rotate the screw 1/2 turn clockwise (CW) to add fuel and reduce the O
specified level. Recalibration MUST be performed again from 50% down to 14% (for the
BMK 3000DF) or 50% down to 16% (for the BMK 2500DF) after making a change to the
idle screw (TAC valve).
29. This completes the NATURAL GAS combustion calibration procedures.
OMM-0099_0A
GF-145
CHAPTER 4 – INITIAL START-UP
Oxygen (O
) %
Nitrogen Oxide (NOx)
2
5.5% ± 0.3
5.7% ± 0.3
5.6% ± 0.3
6.2% ± 0.3
Oxygen (O
) %
Nitrogen Oxide (NOx)
2
6.2% ± 0.3
6.0% ± 0.3
5.8% ± 0.3
6.0% ± 0.3
Figure 4-4: TAC Valve Adjust (Idle Screw)
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
Ph.: 800-526-0288
Carbon Monoxide (CO)
<30 ppm
<30 ppm
<30 ppm
<30 ppm
Carbon Monoxide (CO)
<20 ppm
<20 ppm
<20 ppm
<20 ppm
<100 ppm
<100 ppm
<100 ppm
<100 ppm
<100 ppm
<50 ppm
<50 ppm
<50 ppm
to the
2
TAC VALVE
IDLE SCREW
Page 59 of 234
PR1: 05/21/2014
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