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Benchmark 750-3000 Boiler Installation & Startup Manual
SECTION 4 – INITIAL START-UP
NATURAL GAS Combustion Calibration Instructions
26.
With the valve position at 100%, if the oxygen level is still not within the required tolerance
after adjusting the blower voltage, then the gas pressure on the downstream side of the
SSOV must be adjusted using the gas pressure adjustment screw on the SSOV (Figure 4-
3). Slowly rotate the gas pressure adjustment in 1/4-turn increments) Clockwise to reduce
O
level or counterclockwise to increase it. Allow the combustion analyzer to stabilize
2
following each adjustment.
27.
Once the oxygen level is within the specified range at 100%, record the O
readings on the Combustion Calibration Data Sheets provided with the unit.
Press the Up ▲ arrow key until SET Valve Position appears and then press CHANGE.
28.
Use the Down ▼arrow key to lower the valve position to one of the following:
29.
•
BMK 750 & 1000: 80%
•
BMK 1500 – 3000: 70%
NOTE:
Remaining combustion calibration steps are performed using the Combustion Cal menu in
the C-More Controller. The combustion calibration control functions will be used to adjust
the oxygen level (%) at valve position percentages described in the steps below. These
instructions assume that the inlet air temperature is between 50°F and 100°F (10°C –
37.8°C). If NO
readings exceed the target values in Table 4-2, above, increase the O
x
up to 1% higher than the listed calibration range. Record the increased O
Combustion Calibration sheet.
30.
Repeat steps 21 through 25 for valve positions shown in Table 4-3a through 4-3d,
depending on the model you are calibrating. The O
ranges shown in these tables.
TABLE 4-3a: NATURAL GAS Final Valve Positions: BMK 750 – 1000
Standard NO
Valve
Oxygen (O
Position
%
80%
5.5% ± 0.2%
60%
5.5% ± 0.2%
45%
5.5% ± 0.2%
30%
5.5% ± 0.2%
18%
5.5% ± 0.2%
TABLE 4-3b: NATURAL GAS Final Valve Positions: BMK 1500 – 2000
1500 & 2000 – Single Fuel Units
Valve Position
1500
2000
O
70%
6.0% ± 0.2%
50%
6.3% ± 0.2%
40%
7.0% ± 0.2%
30%
7.0% ± 0.2%
16%
18%
7.0% ± 0.2%
OMM-0121_D • GF-205 • 5/9/2019
x
)
Nitrogen
2
Oxygen (O
Oxide (NO
)
x
≤20 ppm
6.0% ± 1.0%
≤20 ppm
6.0% ± 1.0%
≤20 ppm
6.0% ± 1.0%
≤20 ppm
6.0% ± 1.0%
≤20 ppm
6.0% ± 1.0%
Standard NOx
%
NOx
2
≤20 ppm
≤20 ppm
≤20 ppm
≤20 ppm
≤20 ppm
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
, NO
and CO should stay within the
2
x
Ultra-Low NO
x
Nitrogen
) %
2
Oxide (NO
x
≤9 ppm
≤9 ppm
≤9 ppm
≤9 ppm
≤9 ppm
Ultra-Low NOx
O
%
NOx
2
≤9 ppm
5.5% ± 1.0%
≤9 ppm
5.8% ± 1.0%
≤9 ppm
6.0% ± 1.0%
≤9 ppm
6.0% ± 1.0%
≤9 ppm
8.0% ± 1.0%
, NO
and CO
2
x
level
2
value on the
2
Carbon
Monoxide
(CO)
)
<100 ppm
<100 ppm
<50 ppm
<50 ppm
<50 ppm
CO
<100 ppm
<100 ppm
<50 ppm
<50 ppm
<50 ppm
Page 65 of 122
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