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Benchmark 5000-6000 Boiler Installation & Startup Manual
SECTION 4: INITIAL START-UP
NATURAL GAS Combustion Calibration Instructions
20. Compare the measured oxygen level to the oxygen range shown in Table 4-2. Also, ensure
that the nitrogen oxide (NOx) and carbon monoxide (CO) readings do not exceed the
values shown in Table 4-2. If your target NOx value is 9 ppm or less, use the values in the
Ultra-Low NOx columns. If you are not in a "NOx-limited" area and/or do not have a NOx
measurement in your analyzer, set the oxygen (O
TABLE 4-2: NATURAL GAS Calibration Reading at 100% Valve Position
Standard NO
Nitrogen Oxide
Oxygen (O
) %
2
5.5% ± 0.5%
21. Next, press the Down ▼ arrow key until CAL Voltage 100% is displayed.
22. Press the CHANGE key and observe that CAL Voltage 100% is flashing.
23. The oxygen level at the 100% valve position should match the value in Table 4-2. Also,
ensure that the NOx and CO readings do not exceed the values in Table 4-2.
24. 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 Up ▲ arrow key increases the oxygen level and pressing the down
▼ arrow key decreases the oxygen level.
25. Once the oxygen level is within the specified range at 100%, press the ENTER key to store
the selected blower output voltage for the 100% valve position. Record all readings on the
Combustion Calibration Sheets provided.
26. With the valve position at 100%, if the oxygen level is 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 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.
28. Lower the valve position to 70% using the ▼arrow key.
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.
OMM-0123_E • GF-207 • 12/17/2019
x
Oxygen (O
(NO
)
x
≤20 ppm
6.0% ± 1.0%
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
) at 5.5% ± 0.5%.
2
Ultra-Low NO
x
Nitrogen Oxide
) %
2
(NO
)
x
≤9 ppm
Carbon Monoxide
(CO)
<100 ppm
2
, NOx and CO
2
level
2
value on the
2
Page 53 of 95
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