Owner`s manual

GP-MSJW-CX-07B
STW-JZ / IW Manual
RD: Sept, 2005
RL: 7B
KH
14. HEATER EXPANSION
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 155,000 2 1/2”
40 ft / 50 ft / 60 ft 175,000 2 3/4”
50 ft 200,000 2 3/4”
60 ft 130,000 2 1/2”
60 ft 200,000 3 1/4”
10 ft / 20 ft 45,000 1”