Watts AERCO Benchmark BMK5000 Operation And Service Manual page 44

Benchmark Platinum-Edge [ii]: Operation-Service Manual
SECTION 4 – INITIAL START-UP
NATURAL GAS Manual Combustion Calibration Instructions
16. With the valve position still at 100%, insert the combustion analyzer probe into the exhaust
manifold probe opening (see Figure 4-2a – 4-2c in Section 4.2.3) and allow enough time
for the combustion analyzer reading to stabilize.
17. Compare the combustion analyzer's oxygen (O
column (Figure 4-6). If they differ, go to the
O2 Sensor screen and adjust the O2 Offset parameter, up to ±3%, to make the on-board
O sensor match the value from the combustion analyzer. If your combustion analyzer is
2
correctly calibrated, and the on-board O
the sensor may be defective and need to be replaced.
value in the Target and Reading columns. If they don't match, adjust the
18. Compare the O
2
Blower Voltage until the O
press on the field and type the value directly.
19. If adjusting the blower voltage is not sufficient to get the O
Target column, then repeat Step 15 to adjust the gas pressure up or down within the range
shown in the table, then repeat Step 18. Continue repeating Steps 15 and 18 until the gas
pressure is within the range in Table 4-1 and the O
column.
20. Enter the downstream manometer's gas pressure reading in the Downstream Gas
Pressure field. Note, this field appears only when Valve Position % = 100%.
21. Compare the measured nitrogen oxide (NOx) and carbon monoxide (CO) readings to the
Target values in Table 4-2 (shown as a reference only). If you chose the NOx <=9 ppm in
step 9, 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 O
the Standard NOx column in the table below.
TABLE 4-2: NATURAL GAS Calibration Target Values @ 100% Valve Position
Model
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%
4000/5000N * 5.5% ± 0.2%
5000/6000 5.5% ± 0.5%
* The 4000, 4000DF, 5000N and 5000NDF can operate at 4.5% O
that do not have NOx restrictions
NOTES:
These instructions assume that the inlet air temperature is between 50°F and 100°F
(10°C – 37.8°C). If NOx readings exceed the target values in Table 4-1, above, or Table 4-
3, below, increase the O
the increased O value on the Combustion Calibration sheet.
2
OMM-0137_J •
12/20/2022
sensor cannot be made to match the analyzer,
2
value in both columns match; use either the + or – controls, or
2
Standard NOx
% NOx
2
≤20 ppm
≤20 ppm
≤20 ppm
≤20 ppm
≤20 ppm
≤20 ppm
≤20 ppm
≤20 ppm
≤20 ppm
.
level up to 1% higher than the Target value. You must then record
2
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
) reading to the O
2 2
Main Menu → Calibration → Input/Output →
Reading column to match the
2
Reading column matches the Target
2
Ultra-Low NOx
O % NOx
2
≤9 ppm
6.0% ± 1.0%
≤9 ppm
6.0% ± 1.0%
≤9 ppm
5.7% ± 1.0%
≤9 ppm
6.0% ± 1.0%
- -
- -
- -
≤9 ppm
6.0% ± 0.2%
≤9 ppm
6.0% ± 1.0%
at full fire in jurisdictions
2
value in the Reading
to the value in
2
CO
<100 ppm
<100 ppm
<100 ppm
<100 ppm
<100 ppm
<100 ppm
<100 ppm
<100 ppm
<100 ppm
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