AERCO Innovation (G-10-1350 to G-11-0563) - Manual (Page 44)

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Innovation Series Water Heaters Chapter 4
OMM-0079_0B USER MANUAL Initial Start-Up
Page 44 of 200 AERCO International, Inc. · 100 Oritani Dr. · Blauvelt, NY 10913 · Ph.: 800-526-0288
07/21/11
10. Next, verify that the gas pressure downstream of the SSOV is within the range of 2.6” to 2.8” W.C. If
gas pressure adjustment is required, remove the brass hex nut on the SSOV actuator to access the
gas pressure adjustment screw (Figure 4-3). Make gas pressure adjustments using a flat-tip
screwdriver to obtain a gas pressure within the required range of 2.6” to 2.8” W.C.
Figure 4-3. Gas Pressure Adjustment Screw Location
11.
Using the ▲ arrow key, Increase the valve open position to 100%. Verify that the gas pressure at the
inlet of the SSOV is 7.0” W.C. Readjust the inlet gas pressure if necessary
.
12.
Next, decrease the valve open position to 16% using the ▼ arrow key.
13. Insert the combustion analyzer probe int the 1/8” port at the rear of the exhaust manifold. Allow
enough time for the combustion analyzer to settle.
14. Verify that the oxygen (O
2
) level is within the range shown below Also, ensure that the carbon
monoxide (CO) and nitrogen oxide (NOx) readings do not exceed the values shown.
Combustion Oxygen Level at
16% Valve Position
Oxygen %
± 0.5
Carbon
Monoxide NOx
6.5 % <50 ppm <15 ppm
15. If the oxygen level is not within the required tolerance, the gas pressure on the downstream side of the
SSOV must be adjusted using the adjustment screw on the SSOV regulator (Figure 4-3). Slowly rotate
the gas pressure adjustment (approximately 1/4-turn increments). Allow the combustion analyzer to
stabilize following each adjustment. Clockwise rotation reduces the oxygen level, while
counterclockwise rotation increases the oxygen level.
16. Once the oxygen level is within the required range, the gas pressure on the downstream side of the
SSOV should be within the range of 2.6” to 2.8” W.C. at the 16% valve position.
17. Replace the brass cap on the SSOV gas pressure adjustment if it was previously removed.
18. This completes the combustion calibration procedure.