AERCO Innovation (G-13-1854 and above) - Manual (Page 54)

Innovation Water Heaters Installation, Operation & Maintenance Manual
CHAPTER 4 – INITIAL START-UP
Page 54 of
196 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
OMM-0078_0J
PRI: 11/22/2013
Phone: 800-526-0288
GF-128
Natural Gas Combustion Calibration - Continued
11.
Next, decrease the valve open position to 16% using the ▼ arrow key. Verify that the gas
pressure at the inlet of the SSOV is 8.0” to 11.0” W.C. Readjust the inlet gas pressure if
necessary.
12. 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.
13. Verify that the oxygen (O
2
) level is within the range shown below. Also, ensure that the
carbon monoxide (CO), nitrogen oxide (NOx) and flame strength readings are within the
values shown.
Combustion Oxygen Level at 16% Valve Position
Oxygen %
± 0.5
Carbon
Monoxide NOx
Flame
Strength
6.5 % <50 ppm <15 ppm >2.0 µA
14. 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 4-4). 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.
15. Once the oxygen level is within the required range listed in step 13, the gas pressure on the
downstream side of the SSOV should be within the appropriate range shown below for the
Innovation Model being tested.
INNOVATION MODEL GAS PRESSURE RANGE
DOWNSTREAM OF SSOV
INN 1350 3.0” – 3.2” W.C.
INN1060 2.6” – 2.8” W.C.
INN800 1.5” – 1.7” W.C.
INN600 0.9” – 1.1” W.C.
16. Replace the brass cap on the SSOV gas pressure adjustment if it was previously removed.
17. Following combustion calibration at the 16% valve position, check the combustion readings
at each of the valve positions listed below and record the readings on the Start-Up &
Registration data sheets provided with the unit. During these checks, DO NOT attempt to
adjust the downstream gas pressure using the SSOV gas pressure adjustment screw.
NOTE
Based on the water heater load, it may not be possible to obtain data at all of
the points listed without encountering an Over-Temp condition.
18. Valve Positions to be checked:
• 20%,
• 30%,
• 40%,
• 50%, • 60%,
• 80%,
• 100%
This completes the Natural Gas combustion calibration procedure.