GP-MSJV-BX-07A
STV-JZ Manual
RD: MAR 2009
RL: 07A - BA
Page 21
The Btu/hr input and the tube length determine the overall expansion that occurs in a tube
system. A typical infrared tube installation will expand toward both the Burner and the vent
end. In order to address this issue it is suggested that the gas line, flue vent, and combustion
air intake (if used) shall be installed in such a manner that the normal expansion of the
heater will be accommodated.
Tube Length in Feet
Btu/Hr Input Rating
Approximate
Overall Expansion
20 ft / 30 ft
60,000
1 1/2”
20 ft / 30 ft / 40 ft
80,000
1 3/4
20 ft / 30 ft / 40 ft / 50 ft
110,000
2”
30 ft / 40 ft / 50 ft
130,000
2”
40 ft / 50 ft / 60 ft
155,00
2 1/2”
14. HEATER EXPANSION
