Propane Gas Combustion Calibration - Watts AERCO Benchmark BMK750 Operation And Service Manual

Benchmark with Edge [I]: Operation-Maintenance Manual
SECTION 4 – INITIAL START-UP
NATURAL GAS Manual Combustion Calibration Instructions
TABLE 4-3g: NATURAL GAS Final Valve Positions: BMK6000, Single & DF
Valve Position
Single Dual
Fuel Fuel
5.5% ± 0.5%
70% 85%
5.5% ± 0.5%
50% 65%
40% 45% 5.5% ± 0.5%
30% 30% 5.5% ± 0.5%
18% 18% 6.0% ± 1.0%
26. If the oxygen level at the lowest 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 4-3). Rotate the screw 1/2 turn clockwise (CW) to add fuel and reduce
the O to the specified level. Recalibration MUST be performed again from 60% or 50%
2
down to the lowest valve position after making a change to the TAC screw.
This completes the NATURAL GAS combustion calibration procedure.

PROPANE GAS COMBUSTION CALIBRATION

4.4.2
These instructions apply only to units running PROPANE gas.
PROPANE Combustion Calibration Instructions
1. Set the Edge [i] Controller's Enable/Disable switch to Disable.
2. Open the water supply and return valves to the unit and ensure that the system pumps are
running.
3. Open the PROPANE supply valve to the unit.
4. Turn external AC power to the unit ON.
27. On the Controller, go to:
enter a technician level password.
5. The first Manual Combustion Calibration screen appears lists three steps that must be
completed before continuing:
Figure 4-7: First Manual Combustion Calibration Screen
6. Connect the gas pressure manometer to the upstream side of the gas train's SSOV, as
shown in Section 4.2.2 and connect the Combustion Analyzer and Multimeter, as shown in
Section 4.2.3, and ensure that the heating loop is capable of dissipating sufficient heat at
full fire.
OMM-0145_A99 • GF-218 •
Standard NO
x
O % NO
2 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 6.5% ± 1.5%
Main Menu → Calibration → Manual
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
9/18/2019
Ultra-Low NO
x
O % NO
2 x
≤9 ppm
≤9 ppm
≤9 ppm
≤9 ppm
≤9 ppm
Combustion. If necessary,
CO
<100 ppm
<100 ppm
<50 ppm
<50 ppm
<50 ppm
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