ITH-Series Technical Manual
Page 5
Cambridge
Engineering
Inc.
Introduction
Gas Supply Lines
Gas supply pipe sizing must be in accordance with the National Fuel Gas Code, ANSI Z223.1/NFPA 54.
A 1/8" NPT plugged tap must be installed in the gas line connection immediately upstream of the burner
farthest from the gas supply meter to allow checking of system gas pressure.
Electrical
All heaters must be electrically grounded in accordance with the National Electric Code, ANSI/NFPA 70,
and must comply with all local requirements.
Venting
Refer to the National Fuel Gas Code, ANSI Z223.1/NFPA 54 for proper location, sizing and installation
of vents as well as information on clearance requirements when penetrating combustible walls for venting
purposes.
