Watts Aerco INN 1060N - Page 62

Innovation - Edge [i] Installation, Operation, Maintenance Manual
CHAPTER 4 – INITIAL START-UP
OMM-0143_A • GF-216 • 9/6/2019 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page 62 of 170
Combustion Calibration Instructions
• Verify that the gas supply conforms to the requirements in the Innovation-Edge Gas
Supply Design Guide (TAG-0091, GF-5036).
• Verify that the regulator (if one is used) is properly sized.
• Verify that there was no sudden drop in gas pressure or that gas pressure is steady,
with no variations or pulsations.
• Verify that venting is conforms to the requirements in the Innovation-Edge Venting and
Combustion Air Design Guide (TAG-0090, GF-5056).
• Verify that condensate is draining properly.
19. Repeat the previous step for the remaining valve positions in Table 4.3-2.
TABLE 4.3-2: Combustion Calibration Readings – All Models
Valve
Position
Oxygen (O
2
) %
Nitrogen Oxide
(NOx)
Carbon
Monoxide (CO)
Flame µA
100%
6.0% ± 0.2%
<20 ppm
<100 ppm
> 7
90%
6.0% ± 0.2%
<20 ppm
<100 ppm
> 7
80%
6.0% ± 0.2%
<20 ppm
<100 ppm
> 7
60%
6.0% ± 0.2%
<20 ppm
<100 ppm
> 7
50%
6.0% ± 0.2%
<20 ppm
<100 ppm
> 7
40%
6.0% ± 0.2%
<20 ppm
<100 ppm
> 7
30%
6.0% ± 0.2%
<20 ppm
<100 ppm
> 7
20%
5.5% ± 0.2%
<20 ppm
<100 ppm
> 7
20. If the oxygen level at the lowest valve position is too high, and the Blower voltage is at the
minimum value, you can adjust the TAC screw, which is recessed in the bottom of the
Air/Fuel Valve. Rotate the screw 1/2 turn clockwise (CW) to add fuel and reduce the O
2
to the specified level. Recalibration MUST be performed again from 60% or 50% down to
the lowest valve position after making a change to the TAC screw.
VIEWED FROM BELOW LOOKING STRAIGHT UP
Figure 4.3-5: TAC Screw Location
21. Once combustion calibration has been completed, you can view the results by going to
TAC Screw