Gas Piping; General Requirements - Berner GR Series Operating And Service Instructions

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 1/2"-inch 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 USA 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 15, in one plane,
and without sharp bends, kinks or twists. A smooth loop of approximately 12" inches 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.
Series GR
CORRECT POSITIONS
Heater Movement
3" (7.62 cm) Max.
Displacement
12"
(30 cm)
INCORRECT POSITIONS
Heater Movement
WRONG
Heater
Movement
WRONG
Figure 15: Flexible Gas Connection
Vertical
(As Shown Below)
Heater Movement
WRONG
Heater
WRONG
Movement
Page 18
Alternate
Positions
Okay
February 10, 2014