2. Refer to Section 3, Venting and Air Intake for
information on obtaining vent samples from this
boiler.
25
FUEL PIPING
Natural Gas Propane (LP)
Low Fire High Fire Low Fire High Fire
Carbon
Monoxide
(CO)
< 75 ppm < 200 ppm < 75 ppm < 200 ppm
Carbon
Dioxide
(CO
2
)
8.8% to
11.6%
8.5% to
9.7%
9.8% to
12.5%
9.5% to
10.5%
Table 5.3: Recommended CO
2
Settings
Figure 5.3: PBC-40/52™ Gas Valve and Venturi
Detail
Figure 5.2: PBC-34™ Gas Valve and Venturi Detail
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