Watts AERCO Edge [ii] Operation Manual page 63

Edge [ii] Controller Operation Manual
SECTION 3: CALIBRATION
6. The NOx Requirements screen appears. Choose the NOx target: 9 ppm, 20 ppm or None.
The combustion calibration target table for the BMK model and the selected NOx
requirement is loaded into the Controller.
NOTE:
The 9-ppm option is only available for BMK750 – 2000 and BMK4000 – 6000 models.
Figure 3.1-2: Assisted Combustion: NOx Requirement Screen
7. The unit is put in Manual mode (but is not yet firing) and a message appears saying O2
Sensor Calibration in Progress. Wait 1 to 2 minutes for this step to complete.
8. The unit now begins the ignition sequence (see Section 7.1 for details) and continues until
the unit is firing at full valve position (max fire rate). This step may take a minute or more.
9. When the ignition sequence is complete, the Downstream Gas Pressure screen appears.
Enter the manometer's gas pressure reading. The allowable gas pressure range varies by
model. See the Benchmark Pre-Installation Gas Supply Guide, TAG-0047 (GF-2030) for
specifications.
Figure 3.1-3: Assisted Combustion: Downstream Gas Pressure Screen
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OMM-139_E 8/25/2020
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