AERCO BMK 6000 Dual Fuel - Manual (Page 64)

Benchmark 6000 DF Installation, Operation & Maintenance Manual
CHAPTER 4 – INITIAL START-UP
Page 64 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
Figure 4-3: Gas Pressure Adjustment Screw Location
11.
Using the ▲ arrow key, increase the valve open position to 100%. Verify that the gas
pressure on the downstream side of the SSOV settles within the required range of 7.9 ±
0.4” W.C. Readjust the gas pressure if necessary.
NOTE
Record this value as it will be used in the low & high pressure gas tests, in
sections 6.3 and 6.4.
12. With the valve position at 100%, insert the combustion analyzer probe into the flue probe
opening and allow enough time for the combustion analyzer reading to stabilize.
13. Compare the oxygen readings on the combustion analyzer to the on-board O
2
sensor value
displayed in the Operating Menu of the C-More Control Panel. If the values differ by more
than ±1.5% and your combustion analyzer is correctly calibrated, the on-board O2 sensor
may be defective and need to be replaced.
14. Compare the measured oxygen level to the oxygen range shown below. Also, ensure that
the nitrogen oxide (NOx) and carbon monoxide (CO) readings do not exceed the values
shown. If you are not in a “NOx-limited” area and/or do not have a NOx measurement in
your analyzer, set the oxygen (O
2
) at 5.1% ± 0.5%.
Combustion Calibration Readings
Valve Position Oxygen (O
2
) % Nitrogen Oxide (NOx) Carbon Monoxide (CO)
100% 5.4% - 6.3% <20 ppm <100 ppm
15. If the oxygen level is not within the required tolerance, the gas pressure on the
downstream side of the SSOV must be adjusted using the gas pressure adjustment screw
on the SSOV (see Figure 4-3). Slowly rotate the gas pressure adjustment (approximately
1/4-turn increments). Allow the combustion analyzer to stabilize following each adjustment.
Clockwise rotation reduces the oxygen level, while counterclockwise rotation increases the
oxygen level.
BRASS HEX HEAD
(Remove to access the Gas
Pressure Adjustment Screw)