Watts Aerco Benchmark OMM-0124 Installation And Start-Up Manual page 54

Benchmark 5000-6000 Boiler Installation & Startup Manual
SECTION 4: INITIAL START-UP
NATURAL GAS Combustion Calibration Instructions
29. Repeat steps 21 through 25 for valve positions shown in Table 4-3a and 4-3b. The O
NOx and CO should stay within the ranges shown in the Tables.
TABLE 4-3a: NATURAL GAS Final Valve Positions: BMK 5000
Valve Position
Single Dual
Fuel Fuel
70%
50%
40%
30%
18%
Note: BMK5000 Low Gas Pressure (LGP) Models do not offer Ultra Low NOx settings.
TABLE 4-3b: NATURAL GAS Final Valve Positions: BMK 6000
Valve Position
Single Dual
Fuel Fuel
70% 85%
50% 65%
40% 45%
30% 30%
18% 18%
Note: BMK6000 Low Gas Pressure (LGP) Models do not offer Ultra Low NOx settings.
NOTE:
If NO readings exceed the target values in Table 4-3a or 4-3b, increase the O
x
1% higher than the range shown in the table. Record the increased O
Combustion Calibration sheet.
30. If the oxygen level at the 18% 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 4-3). 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 50% down to
2
the lowest valve position after making a change to the TAC screw.
This completes the NATURAL GAS combustion calibration procedure.
OMM-0123_E • GF-207 • 12/17/2019
Standard NO
x
O % NO
2 x
5.5% ± 0.5%
<20 ppm
5.5% ± 0.5%
<20 ppm
5.5% ± 0.5%
<20 ppm
5.5% ± 0.5%
<20 ppm
6.0% ± 1.0%
<20 ppm
Standard NO
x
O % NO
2 x
5.5% ± 0.5% <20 ppm 6.0% ± 1.0%
5.5% ± 0.5% <20 ppm 6.0% ± 1.0%
5.5% ± 0.5% <20 ppm 6.0% ± 1.0%
5.5% ± 0.5% <20 ppm 6.0% ± 1.0%
6.0% ± 1.0% <20 ppm 6.5% ± 1.5%
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
Ultra-Low NO
x
O % NO
2
≤9 ppm
6.0% ± 1.0%
≤9 ppm
6.0% ± 1.0%
≤9 ppm
6.0% ± 1.0%
≤9 ppm
6.0% ± 1.0%
≤9 ppm
6.5% ± 1.5%
Ultra-Low NO
x
O % NO
2
≤9 ppm
≤9 ppm
≤9 ppm
≤9 ppm
≤9 ppm
,
2
CO
x
<100 ppm
<100 ppm
<50 ppm
<50 ppm
<50 ppm
CO
x
<100 ppm
<100 ppm
<50 ppm
<50 ppm
<50 ppm
level up to
2
value on the
2
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