Install Instructions

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107750-01 - 9/17
Model Size
Max. (Natural & LP),
in. wc
Min. (Natural),
in. wc
Min. (LP),
in. wc
320-399 14.0 (3.5 kPa) 3.5 (0.88 kPa) 8.0 (2.0 kPa)
Table 8.2: Minimum and Maximum Inlet Pressures
VIII. Gas Piping (continued)
CAUTION
Support the weight of the gas line piping independently from the boiler gas connection tting located on the
left side of the boiler.
If an additional regulator is used to reduce boiler inlet pressure below 1/2 psig (3.5 kPa) it must be at least 6
to 10 ft. upstream of the boiler.
It is very important that the gas line is properly purged by the gas supplier or utility company.
Figure 8.1: Gas Connection to Boiler