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Benchmark 750-3000 Installation & Startup Manual
SECTION 4 – INITIAL START-UP
NATURAL GAS Combustion Calibration Instructions
15.
On Benchmark 3000 units only, once the manifold gas pressure is within the range in
table 4-1, record this value; it will be used later, in Section 5.2.2: Low Pressure Gas Test,
and Section 5.3.2: High Pressure Gas Test.
Press the Down▼ arrow key until SET Valve Position appears on the display, then press
16.
CHANGE.
Press the Up ▲ arrow key until the SET Valve Position reads 100%, then press ENTER.
17.
18.
With the valve position at 100%, insert the combustion analyzer probe into the exhaust
manifold probe opening (see Figure 4-2a or 4-2b in Section 4.2.3) and allow enough time
for the combustion analyzer reading to stabilize.
Compare the combustion analyzer's oxygen readings to the O
19.
the Operating menu on the C-More Controller. The offset value in the Calibration menu can
be adjusted by ±3% to make the on-board O
analyzer. If the values differ by more than ±3% and your combustion analyzer is correctly
calibrated, the on-board O
20.
Compare the measured oxygen level to the oxygen range shown in Table 4-2. Also, ensure
that the nitrogen oxide (NO
values shown in Table 4-2. If your target NO
columns. If you are not in a "NO
Ultra-Low NO
x
measurement in your analyzer, set the oxygen (O
TABLE 4-2: NATURAL GAS Calibration Readings 100% Valve Position
Model
Oxygen (O
%
750
5.5% ± 0.2%
1000
5.5% ± 0.2%
1500
5.2% ± 0.2%
2000
6.0% ± 0.2%
2500
5.6% ± 0.2%
3000
5.1% ± 0.2%
3000 DF
5.3% ± 0.2%
Next, press the Down ▼ arrow key until CAL Voltage 100% is displayed.
21.
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 NO
If the oxygen level is not within the specified range, adjust the level using the ▲ and ▼
24.
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.
•
•
OMM-115_D
GF-200
5/9/2019
sensor may be defective and need to be replaced.
2
) and carbon monoxide (CO) readings do not exceed the
x
Standard NO
x
)
Nitrogen
2
Oxide (NO
)
x
≤20 ppm
≤20 ppm
≤20 ppm
≤20 ppm
≤20 ppm
≤20 ppm
≤20 ppm
and CO readings do not exceed the values in Table 4-2.
x
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
2
sensor match the value from the combustion
2
value is 9 ppm or less, use the values in the
x
-limited" area and/or do not have a NO
x
) at 5.5% ± 0.5%.
2
Ultra-Low NO
x
Oxygen (O
)
Nitrogen
2
%
Oxide (NO
≤9 ppm
6.0% ± 1.0%
≤9 ppm
6.0% ± 1.0%
≤9 ppm
5.7% ± 1.0%
≤9 ppm
6.0% ± 1.0%
-
-
-
-
-
-
126
Sensor value displayed in
Carbon
Monoxide (CO)
)
x
<100 ppm
<100 ppm
<100 ppm
<100 ppm
<100 ppm
<100 ppm
<100 ppm
Page 64 of
x
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