Watts Aerco Benchmark OMM-0116 Installation And Start-Up Manual page 66

Benchmark 750-3000 Installation & Startup Manual
SECTION 4 – INITIAL START-UP
NATURAL GAS Combustion Calibration Instructions
TABLE 4-3c: NATURAL GAS Final Valve Positions: BMK 1500DF-2000DF
BMK 1500
Dual Fuel Units
Valve %
70%
50%
40%
30%
16%
BMK 2000
Dual Fuel Units
70%
50%
40%
30%
16%
TABLE 4-3d: NATURAL GAS Final Valve Positions: BMK 2500 & 3000
BMK 2500
Single Fuel
Valve % O
2
70% 5.9% ± 0.2%
50% 6.0% ± 0.2%
40% 6.3% ± 0.2%
30% 6.3% ± 0.2%
16% 6.0% ± 0.2%
BMK 3000
70% 5.1% ± 0.2%
50% 6.1% ± 0.2%
40% 5.0% ± 0.2%
30% 6.4% ± 0.2%
14% 6.4% ± 0.2%
NOTE:
If NO readings exceed the target values in Table 4-3a through 4-3d, increase the O
x
up to 1% higher than the listed calibration range shown in the table. Record the increased
O value on the Combustion Calibration sheet.
2
31. If the oxygen level at the lowest valve position is too high, and the Blower voltage is at the
minimum value, you can adjust the TAC screw, 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 to the specified level. Recalibration MUST be performed again from 60% down to
2
the lowest valve position after making a change to the TAC screw.
This completes the NATURAL GAS combustion calibration procedure.
• •
OMM-115_D GF-200 5/9/2019
O %
2
6.0% ± 0.2%
6.3% ± 0.2%
7.0% ± 0.2%
7.0% ± 0.2%
8.0% ± 0.2%
6.5% ± 0.2%
6.5% ± 0.2%
6.5% ± 0.2%
6.5% ± 0.2%
5.5% ± 0.2%
Dual Fuel
% Valve %
70% 5.9% ± 0.2%
45% 6.2% ± 0.2%
30% 6.0% ± 0.2%
20% 5.8% ± 0.2%
16% 6.0% ± 0.2%
85% 5.4% ± 0.2%
65% 5.5% ± 0.2%
45% 5.7% ± 0.2%
30% 5.6% ± 0.2%
14% 6.2% ± 0.2%
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
NOx
≤20 ppm
≤20 ppm
≤20 ppm
≤20 ppm
≤20 ppm
≤20 ppm
≤20 ppm
≤20 ppm
≤20 ppm
≤20 ppm
NO
x
O %
2
≤20 ppm
≤20 ppm
≤20 ppm
≤20 ppm
≤20 ppm
≤20 ppm
≤20 ppm
≤20 ppm
≤20 ppm
≤20 ppm
126
CO
<100 ppm
<100 ppm
<50 ppm
<50 ppm
<50 ppm
<100 ppm
<100 ppm
<50 ppm
<50 ppm
<50 ppm
CO
<100 ppm
<100 ppm
<50 ppm
<50 ppm
<50 ppm
<100 ppm
<100 ppm
<50 ppm
<50 ppm
<50 ppm
level
2
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