Watts AERCO Benchmark OMM-0136 - Propane Gas Combustion Calibration

Benchmark Platinum-Edge [II]: Operation-Service Manual
SECTION 4 – INITIAL START-UP
OMM-0137_E • GF-211 • 12/13/2019 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page 45 of 153
NATURAL GAS Manual Combustion Calibration Instructions
TABLE 4-3g: NATURAL GAS Final Valve Positions: BMK6000, Single & DF
Valve Position
Standard NO
x
Ultra-Low NO
x
CO
Single
Fuel
Dual
Fuel
O
2
%
NO
x
O
2
%
NO
x
70%
85%
5.5% ± 0.5%
<20 ppm
6.0% ± 1.0%
≤9 ppm
<100 ppm
50%
65%
5.5% ± 0.5%
<20 ppm
6.0% ± 1.0%
≤9 ppm
<100 ppm
40%
45%
5.5% ± 0.5%
<20 ppm
6.0% ± 1.0%
≤9 ppm
<50 ppm
30%
30%
5.5% ± 0.5%
<20 ppm
6.0% ± 1.0%
≤9 ppm
<50 ppm
18%
18%
6.0% ± 1.0%
<20 ppm
6.5% ± 1.5%
≤9 ppm
<50 ppm
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
2
to the specified level. Recalibration MUST be performed again from 60% or 50%
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:
Note: BMK6000 Low Gas Pressure (LGP) Models do not offer Ultra Low NOx settings.