Series TA/TX/TXR
Page 30
Jan 07, 2015
Gas Piping
General Requirements
The gas meter and service must be sufficiently large to supply gas to the connected building gas load
including the heating equipment and any other gas fired equipment. Additionally, the gas
distribution piping must be designed according to local and national ordinances. Generally (low
pressure) systems designed with a maximum ½" W.C. total pressure drop meet this requirement.
Gas supply pipe sizing must be in accordance with the
National Fuel Gas Code,
ANSI Z223.1
(NFPA 54) in the US and CAN/CGA B149.1 and B149.2
Installation Codes
in Canada.
Before connecting burners to the gas supply system, verify that high pressure testing of the system
has been completed. Failure to do so may expose the burner components to damaging high
pressure, requiring replacement of key components.
Flexible gas connectors of approved type must be installed as shown in Figure 29, in one plane, and
without sharp bends, kinks or twists. A smooth loop of approximately 12" in diameter is best. Failure to
install the gas connection in the approved manner will result in a hazardous and potentially deadly
situation due to the movement of the heat exchanger and burner in the normal course of operation.
Figure 29: Flexible Gas Connections
CORRECT POSITIONS
INCORRECT POSITIONS
WRONG
WRONG
WRONG
WRONG
Heater Movement
Heater
Movement
Heater Movement
Heater
Movement
Shut-Off Valve
Flexible Gas Connector
Heater Movement
Air Flow Direction
12"
0 - 180°
3" (7.62 cm) Max.
Displacement
