4. The unit is put in Manual mode and the Combustion Calibration screen now appears. It
provides two methods to ramp the unit’s valve position up or down:
• Method 1: Toggle through the pre-set calibration points till you reach the desired
valve position, then press Go to go to that point (left image below).
• Method 2: Enable Fine VP Step, then manually press the + or – buttons once per
1% to bring the unit to the desired valve position (right image below).
Figure 3.2-3: Manual Combustion: Manual Combustion Calibration Screen
5. First change the valve position to 30%, press the Go button, verify that the unit has ignited
and is operating as expected, then use (Right) arrow key to change the valve position to
100% and press Go.
6. Record the downstream manometer’s gas pressure reading in the Downstream Gas
Pressure field, which appears only when Valve Position = 100%.
7. Enter O
2
, NOx, CO and flame strength values from the combustion analyzer and multi-meter
at the 100% fire rate in the Reading cells.
8. If the O
2
% Reading value doesn’t match the Target value, use the Blower voltage control to
adjust the combustion process, then repeat this step as needed until the Reading and
Target values are a close match.
9. After completing the steps above at 100%, use either method (see Step 4) to reduce the
valve position to the next step.
10. Repeat Steps 7 – 9 until you reach the last (lowest) calibration point. At the lowest valve
positions, small changes to blower voltage have a large effect.
11. You can press Back and re-calibrate one or more points or view the Combustion
Calibration Complete screen by going to Main Menu → Calibration → Combustion
Summary. See Section 3.5 for instructions on accessing this screen.
![Watts AERCO Edge [ii]](https://data.easymanua.ls/products/808371/200x200/watts-aerco-edge-ii.webp)
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