Allowances For Expansion - Brant Radiant Heaters DES3-20-50 Owner's Manual

DES3 Series

Allowances for Expansion

Allowances must be made for the system to expand as detailed in the Heater Expansion Chart below.
The supplied Type 1 hose gas connector is recommended. If, however, local codes require rigid piping to
the heater, a swing joint can be used.
Chart 3.9 • Heater Expansion Chart
Exchanger length and gas input will determine overall expansion. Heaters in a typical installation will
expand towards both the burner and vent ends. Review for proper flexible gas connection.
Exchanger Length
Feet
20
20
20
20
20
30
30
30
30
30
40
40
40
40
40
40
50
50
50
50
50
60
60
60
60
70
Fixed or High-Fire
Meters Gas Input BTU/h
6.1 40,000
6.1 50,000
6.1 60,000
6.1 65,000
6.1 75,000
9.2 50,000
9.2 60,000
9.2 65,000
9.2 100,000
9.2 125,000
12.2 65,000
12.2 75,000
12.2 100,000
12.2 125,000
12.2 150,000
12.2 175,000
15.3 100,000
15.3 125,000
15.3 150,000
15.3 175,000
15.3 200,000
18.3 125,000
18.3 150,000
18.3 175,000
18.3 200,000
21.4 200,000
3.0 Installation
Inches
1
1 1/4
1 1/2
1 5/8
1 3/4
1 1/4
1 1/2
1 5/8
1 7/8
2
1 5/8
1 3/4
1 7/8
2
2 1/2
2 3/4
1 7/8
2
2 1/2
2 3/4
2 3/4
2
2 1/2
2 3/4
2 3/4
2 3/44
41
• Allowances for Expansion
Expansion Length
Millimeters
25.4
31.8
38.1
41.275
44.5
50.8
38.1
41.275
47.6
50.8
41.275
44.5
47.6
50.8
63.5
69.9
47.6
50.8
63.5
69.9
69.9
50.8
63.5
69.9
69.9
69.9