Aerco BENCHMARK 2500DF User Manual page 61

Benchmark 2500DF-3000DF Installation, Operation & Maintenance Manual
PROPANE Gas Combustion Calibration - Continued
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 1.6" ±
0.2" W.C. (for the BMK 3000DF) or 2.0" W.C. ±0.2" W.C. (for the BMK 2500DF).
Readjust the gas pressure if necessary.
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
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
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
for the BMK 2500DF.
Model
BMK 3000DF
BMK 2500DF
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.
15. Once the oxygen level is within the specified range at 100%, record the O
naivety CO readings on the Combustion Calibration Data Sheets provided with the unit.
16. Use the ▼arrow key to lower the valve position to the following level:
• BMK 3000DF – 85 %
• BMK 2500DF – 70 %
The remaining combustion calibration steps are performed using
the Combustion Cal Menu included in the C-More Control System.
These steps assume that the inlet air temperature is within the
range of 50°F to 100°F. If NOx readings exceed the target values
shown, increase the O
calibration range. Record the increased O
Combustion Calibration sheet.
OMM-0099_0A
GF-145
CHAPTER 4 – INITIAL START-UP
) at 5.2% ± 0.4% for the BMK 3000DF and 5.0% ± 0.4%
2
Combustion Calibration Readings
Valve Oxygen (O
Position %
100% 5.2% - ± 0.4%
100% 5.0% - ± 0.4%
NOTE
level up to 1% higher than the listed
2
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
Ph.: 800-526-0288
) Nitrogen Oxide
2
(NOx)
<100 ppm
<100 ppm
value on the
2
sensor
2
sensor to
2
Carbon
Monoxide (CO)
<150 ppm
<150 ppm
, NOx and
2
Page 61 of 234
PR1: 05/21/2014