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Designs, materials, weights and performance ratings are approximate and subject to change without notice. Visit
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17
Gas Pressure
Test Point
Gas Pressure
Test Point
Gas Pressure
Test Point
Figure 3.4 - Gas Pressure Testing Points
Gas Connection - Continued
Table 3.3 Combustion & Fuel Related Adjustment Table
Natural Gas CO
2
Natural Gas CO ppm
LP Gas CO
2
LP Gas CO ppm
Cover On
Cover Off
Approximate, do not use for setup!
Cover On
Cover Off
Approximate, do not use for setup!
LOW FIRE
8.5%
8.3%
Less than 10
9.6%
9.4%
Less than 15
HIGH FIRE
8.8%
8.6%
Less than 110
10.0%
9.8%
Less than 120
NOTE: All adjustments must be made with the appliance door off, which will lower the CO
2
reading 0.2%. See tables above for
specific readings.
When checking or replacing a gas valve, the CO
2
percentage in the flue gas is the preferred measuring method to insure proper
combustion and firing rate. CO is used as the (temporary) alternate.
Changing incoming air temperature may vary the CO
2
setting slightly (~0.2–0.6%) after initial set up. This is not cause for concern or
reason to set up again. After one year of operation, set up is required again.
If your appliance will be operated in an area that has inlet air temperature variations greater than 80ºF, please use the following table
in adjusting your CO
2
for optimum performance.
Table 3.4 Co2 Adjustment Table
Inlet air
∆
T variation
Setup at minimum incoming
air temperature
Setup at maximum incoming air
temperature
80ºF (26.7ºC)
Reduce CO
2
0.2%
Increase CO
2
0.2%
100ºF (37.8ºC)
Reduce CO
2
0.3%
Increase CO
2
0.3%
120ºF (48.9ºC)
Reduce CO
2
0.4%
Increase CO
2
0.4%