Section 2 — Installation
2-8 Part No. 750-363
2.7 GAS CONNECTIONS
2.7.1 General
The ClearFire Model CFLC gas fired condensing boilers use full modulating burners that require appropriate
gas supply pressure and volume for proper operation. The gas requirements specified in this section must
be satisfied to ensure efficient and stable combustion. Installation must follow these guidelines and those
of any local authorities having installation jurisdiction.
2.7.2 Gas Train Components
CFLC boilers are equipped with a gas train that meets the requirements of ASME CSD-1, FM and XL-GAP
(formerly IRI). The gas train and its components have been designed and tested to operate for the highest
combustion efficiency for the CFLC units.
Figure 2-3 CFLC Gas Train (typical)
Manual
shutoff valve
(MSOV)
High pressure
regulator (optional)
Low gas press. switch
High gas press. switch
MSOV
Double-body gas valve
Gas valve, top view
Leak test cocks
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