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AERCO BMK 6000 Dual Fuel User Manual

Page 68

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Benchmark 6000 DF Installation, Operation & Maintenance Manual

CHAPTER 4 – INITIAL START-UP

Page 68 of 219

AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913

OMM-0096_0B

03/21/2014

Ph.: 800-526-0288

GF-141

PROPANE Gas Combustion Calibration – Continued

Figure 4-5: Gas Pressure Adjustment Screw Location

10.

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 3.8”
W.C. ± 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.

11.

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.

12.

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 ±0.5%, have your combustion analyzer calibration checked as soon as possible. If the
readings differ by more than ±1.5%, use the on-board O

2

sensor to calibrate the unit. Have

your combustion analyzer serviced.

13.

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 4.3% ± 0.3%.

Combustion Calibration Readings

Valve Position

Oxygen (O

2

) %

Nitrogen Oxide (NOx)

Carbon Monoxide (CO)

100%

4.3% ± 0.3%

<200 ppm

<200 ppm

14.

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 (Figure 4-5). 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)