Combined System Length; Heater Expansion / Vent Configuration - Schwank SPW2-JZ Series Installation & Owner's Manual

TABLE 4: COMBINED SYSTEM LENGTH
Installations up to 4500 ft - Higher altitudes refer to Section 27
Do Not Exceed
SPW2-JZ /
Max. Combined
STW2-JZ
System Length*
IWP2 / IW2
With 4" Ø
Model
Air Duct
80 / 60 80 ft
100 ft
110 / 75
100 ft
130 / 90
100 ft
155 / 110
120 ft
175 / 125
200 / 140 120 ft
* Regardless of the allowed maximum length of the individual vent or combustion air duct, do
not exceed the Maximum Combined System Length which includes the length of the tube
heater plus the air duct and the vent.
HEATER EXPANSION AND VENT CONFIGURATION
A radiant tube heater will expand and contract as it heats and cools. Configuration of the vent must
allow for heater expansion.
VERTICAL VENT: Orientation of the vent
at 90° to heater will allow for heater ex-
pansion and contraction.
HORIZONTAL VENT: (See FIG. 17)
Wall Thimble or flashing at wall
◼
that allows movement of the vent
through the opening. Do not seal
the vent to the thimble or flashing
with caulking.
OR
Offset vent with two x 90° elbows.
◼
Install minimum 12 inch [305 mm]
length of straight vent between
elbows. Vent can be sealed with
caulking at non-combustible wall.
Other means of slip fit installation
◼
of the vent are acceptable provid-
ing there is adequate allowance
COMMON VENTING
For vertical vent only, two heaters can be commonly vented using 4"x 6"x 4" Vent Tee JA- 0514-XX.
Both heaters must be operated using one common thermostat. Common vent is 6 inch [150 mm] di-
ameter.
Category III (horizontal vent) heaters cannot be common vented.
Max. Vent
Length*
Individual: 4" Ø
With 5" Ø
Combined: 6" Ø
Air Duct
100 ft Up to 40 ft
120 ft Up to 40 ft
120 ft Up to 40 ft
120 ft Up to 40 ft
140 ft Up to 50 ft
140 ft Up to 50 ft
Max. Air Duct
Length*
(by Duct Diameter)
4" Ø 5" Ø
30 ft 50 ft
30 ft 50 ft
30 ft 50 ft
30 ft 50 ft
30 ft 50 ft
30 ft 50 ft
FIGURE 17: ALLOW FOR HEATER EXPANSION
- HORIZONTAL VENT - TOP VIEW
31
Example
155/110 Model:
Tube Heater Length
1 x 90° elbow (vent)
Straight vent
1 x 90° elbow (duct)
Air Duct: 4" Ø
Combined Length
Max. Allowed
SPW2, STW2(S) / IWP2, IW2(S) I&O Manual
50 ft
5 ft
20 ft
5 ft
17 ft
97 ft
100 ft
IM170629
RL: 03C
RD: APR 2019