Natural Gas Manual Combustion Calibration - Watts Aerco Benchmark BMK750 Operation And Service Manual

Benchmark with Edge [I]: Operation-Maintenance Manual
SECTION 4 – INITIAL START-UP
IT IS IMPORTANT TO PERFORM THE COMBUSTION CALIBRATION PROCEDURE BELOW
TO PROVIDE OPTIMUM PERFORMANCE AND KEEP READJUSTMENTS TO A MINIMUM.
Figure 4-3: Gas Pressure Adjustment Screw and TAC Screw Location
WARNING:
Combustion calibration and AERtrim can both alter the voltage sent to the blower, and can
thus interfere with each other. If AERtrim is enabled, and a change is made to any calibration
point during combustion calibration, you must make a corresponding change to the same
calibration point in AERtrim (see Section 9.4: AERtrim O
to make the change in AERtrim, AERtrim may ignore the combustion calibration value and
adjust the O to the AERtrim value instead.
2

NATURAL GAS Manual Combustion Calibration

4.5.1
These instructions apply only to units running NATURAL GAS.
NATURAL GAS Manual Combustion Calibration Instructions
1. Ensure the Edge [i] Controller's Enable/Disable switch is set to Disable.
2. Open the water supply and return valves to the unit and ensure that the system pumps are
running.
3. Open the NATURAL GAS supply valve to the unit.
4. Turn external AC power to the unit ON.
5. On the Controller, go to:
enter a technician level password.
6. The first Manual Combustion Calibration screen appears lists the three steps that must
be completed before continuing.
OMM-0145_D • GF-218 •
11/2/2020
BRASS HEX HEAD
(Remove to access
Gas Pressure
Adjustment Screw).
Main Menu → Calibration → Manual
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
TAC SCREW
Sensor Auto Calibration). If you fail
2
Combustion. If necessary,
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