AERCO BMK 2000DF - Manual (Page 62)

Benchmark 1500DF - 2000DF Boilers
CHAPTER 4 – INITIAL START-UP
Page 62 of 196 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0098_0A
04/01/2014 Ph.: 800-526-0288 GF-144
PROPANE Combustion Calibration – Continued
23. Next, press the down (▼) arrow key until CAL Voltage 80% is displayed.
24. Press the CHANGE key and observe that CAL Voltage 80% is flashing.
25. The oxygen level at the 80% valve position should be as shown below. Also, ensure that
the nitrogen oxide (NOx) and carbon monoxide (CO) readings do not exceed the
following values:
Combustion Calibration Readings – 80% valve Position
Valve Position Oxygen (O
2
) % Nitrogen Oxide (NOx) Carbon Monoxide (CO)
80% 5.4% ± 0.5% ≤50 ppm <150 ppm
26. If the oxygen level is not within the specified range, adjust the level using the ▲ and ▼
arrow keys. This will adjust the output voltage to the blower motor as indicated on the
display. Pressing the ▲ arrow key increases the oxygen level and pressing the down ▼
arrow key decreases the oxygen level.
27. Once the oxygen level is within the specified range at 80%, press the ENTER key to
store the selected blower output voltage for the 80% valve position. Record all readings
on the Combustion Calibration Sheets provided.
28. Repeat steps 20 through 27 for valve positions of 60%, 45%, 30% and 18% (on the BMK
1500DF only) or 16% (on the BMK 2000DF only). The oxygen (O
2
), nitrogen oxide (NOx)
and carbon monoxide (CO) should remain within the same limits for all valve positions as
shown in the following table.
NOTE
If NOx readings exceed the target values shown (<50 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)
60% 5.5% ± 0.5 <50 ppm <150 ppm
45% 5.5% ± 0.5 <50 ppm <150 ppm
30% 6.3% ± 0.5 <50 ppm <150 ppm
18% BMK 1500DF
6.0% ± 0.5 <50 ppm <150 ppm
16% BMK 2000DF
29. If the oxygen level at the 18% (BMK1500DF) or 16% (BMK2000DF) 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 60% down to 18% (BMK1500DF) or 16%
(BMK2000DF) after making a change to the idle screw (TAC valve).
30. This completes the PROPANE combustion calibration procedure.