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FUEL PIPING
b. Turning the throttle screw clockwise will decrease
the gas flow (decreasing CO
counterclockwise will increase the gas flow rate
(increasing CO
screw show + and – indicating this operation.
c. The recommended CO
5.4. In no case should the boiler be allowed to
operate with CO emissions above 150 ppm.
Table 5.4: Recommended Combustion Settings
Carbon Dioxide (CO
)
2
Carbon Monoxide (CO)
Excess Oxygen (O
)
2
Excess Air
26
) and turning it
2
). Markings adjacent to the throttle
2
settings are given in Table
2
Natural Gas
Low Fire
8.8% to 10.0%
< 50 ppm
3.4% to 5.4%
17.3% to 31.0%
2. Refer to Section 3, Venting and Air Intake for
information on obtaining vent samples from this boiler.
High Fire
8.5% to 9.5%
9.8% to 11.0%
< 100 ppm
4.2% to 6.0%
4.2% to 6.0%
22.4% to 35.8%
22.4% to 35.8%
LP Gas
Low Fire
High Fire
9.5% to 10.5%
< 50 ppm
< 100 ppm
4.9% to 6.5%
27.3% to 40.1%
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