AERCO BMK 6000 Dual Fuel User Manual
Page 66
Benchmark 6000 DF Installation, Operation & Maintenance Manual
CHAPTER 4 – INITIAL START-UP
Page 66 of 219
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
OMM-0096_0B
03/21/2014
Ph.: 800-526-0288
GF-141
Natural Gas Combustion Calibration – Continued
*NOTE
Set the Valve Position at 18% but make adjustments to the Combustion
Calibration value designated as 16%.
NOTE
If NOx readings exceed the target values shown (<20 ppm), increase the O
2
level up to 1% higher than the listed calibration range shown in the table.
Record the increased O
2
value on the Combustion Calibration sheet.
Combustion Calibration Readings
Valve Position
Oxygen (O
2
) %
Nitrogen Oxide (NOx)
Carbon Monoxide (CO)
50%
6% - 7%
<20 ppm
<100 ppm
40%
6% - 7%
<20 ppm
<100 ppm
30%
6% - 7%
<20 ppm
<100 ppm
18%
5% - 7%
<20 ppm
<100 ppm
29.
If the oxygen level at the 18% valve position is too high 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
2
to the specified level. Recalibration MUST be performed again from
50% down to 14% after making a change to the idle screw (TAC valve).
30.
This completes the Natural Gas combustion calibration procedures.
Figure 4-4: TAC Valve Adjust (Idle Screw)
TAC VALVE
IDLE SCREW