AERCO Innovation (G-14-2265 and above) - Manual (Page 58)

Innovation Water Heaters Installation, Operation & Maintenance Manual
CHAPTER 4 – INITIAL START-UP
Page 58 of
206 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
OMM-0078_0L
PRI: 11/25/2014
Phone: 800-526-0288
GF-128
NATURAL GAS Combustion Calibration - Continued
Figure 4-4. Gas Pressure Adjustment Screw Location
13. Replace the brass cap on the SSOV gas pressure adjustment if it was previously removed.
14. With the valve position at 100%, insert the combustion analyzer probe into the 1/8” port at
the rear of the exhaust manifold. Allow enough time for the combustion analyzer to settle.
15. Compare the oxygen (O
2
) level, carbon monoxide (CO), nitrogen oxide (NOx) and flame
strength readings with the range shown in step 19, below. You may need to adjust O
2
%
above this range to meet ultra-low NOx requirements or to avoid combustion tone issues.
16. Press the MENU key on the front panel of the C-More until Combustion Cal Menu appears
on the display.
17.
Press the ▲ arrow key until SET Valve Position reads 100%. Press the ENTER key.
18. Press the CHANGE key and observe that CAL Voltage 100% is flashing.
19. The oxygen level at the 100% valve position should be as shown below. Also, ensure that
the nitrogen oxide (NOx), carbon monoxide (CO) and flame strength readings match the
following values:
Combustion Calibration Readings at 100% Valve Position
Valve
Position
Oxygen (O
2
)
%
Nitrogen Oxide
(NOx)
Carbon Monoxide
(CO)
Flame µA
100% 6.0% ± 0.25% <20 ppm <100 ppm > 6 µA
20. If the oxygen level is not
within the specified range, adjust the level using the ▲ and ▼
arrow keys. This will adjust the output voltage to the blower motor as indicated on the
display. Pressing the ▲ arrow key increases the oxygen level and pressing the down ▼
arrow key decreases the oxygen level.
21. Once the oxygen level is within the specified range at 100%, press the ENTER key to store
the selected blower output voltage for the 100% valve position. Record all readings on the
Combustion Calibration Sheets provided.
22. Repeat steps 16 through 21 for the following valve positions (see NOTE below):
• 80%, 60%, 40%, 30%, 24%, 20%, 16%
NOTE
If NOx readings exceed the target values shown (<20 ppm), increase the O
2
level up to 25% higher than the listed calibration range shown in the table.
Record the increased O
2
value on the Combustion Calibration sheet.
BRASS HEX
HEAD CAP
(Remove to access gas pressure
adjustment screw)