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Benchmark 750-3000 Boiler Installation & Startup Manual
SECTION 4 – INITIAL START-UP
PROPANE Combustion Calibration Instructions
Valve Position
Oxygen (O
BMK 3000
85%
5.2% ± 0.2%
65%
5.4% ± 0.2%
45%
6.0% ± 0.2%
30%
6.4% ± 0.2%
18%
6.4% ± 0.2%
* NOTE:
Set the Valve Position at 18% but make adjustments to the Combustion Calibration value
designated as 16%.
NOTE:
If NO
readings exceed the target values in Table 4-6, increase the O
x
than the listed calibration range shown in the table. Record the increased O
Combustion Calibration sheet.
31.
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 4-4). Rotate the TAC screw 1/2 turn clockwise (CW) to add fuel and
reduce the O
to the specified level. Recalibration MUST be performed again from 60%
2
down to the lowest valve position after making a change to the TAC screw.
This completes the PROPANE gas combustion calibration procedure.
OMM-0121_D • GF-205 • 5/9/2019
) %
Nitrogen oxide (NO
2
≤100 ppm
<100 ppm
<100 ppm
<100 ppm
<100 ppm
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
)
Carbon Monoxide (CO)
x
<150 ppm
<150 ppm
<150 ppm
<100 ppm
<100 ppm
level up to 1% higher
2
value on the
2
Page 70 of 122
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