Propane Gas Combustion Calibration - Watts Aerco Benchmark Series Operation And Service Manual

Benchmark Platinum-Edge: Operation-Service Manual
SECTION 4 – INITIAL START-UP
NATURAL GAS Manual Combustion Calibration Instructions
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.

4.4.2 PROPANE GAS COMBUSTION CALIBRATION

These instructions apply only to units running PROPANE gas.
PROPANE Combustion Calibration Instructions
1. Set the Edge 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.
5. On the Controller, go to: Main Menu  Calibration  Manual Combustion. If necessary,
enter a technician level password.
6. The first Manual Combustion Calibration screen appears lists three steps that must be
completed before continuing:
Figure 4-7: First Manual Combustion Calibration Screen
7. 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.
8. Verify that the incoming gas pressure to the unit is within the allowable range (see the
Benchmark Pre-Installation Gas Supply Guide (TAG-0047, GF-2030)).
9. Once you have completed the previous step, move the manometer (or use a secondary
one) to the the downstream side of the SSOV and press Next to continue.
OMM-0137_D • GF-211 • 7/16/2019
<20 ppm 6.0% ± 1.0%
<20 ppm 6.5% ± 1.5%
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
≤9 ppm
<50 ppm
≤9 ppm
<50 ppm
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