Heater Expansion & Vent Config; Common Venting - Schwank STS-JZ Installation & Owner's Manual

TABLE 4 COMBINED SYSTEM LENGTH: TUBE + AIR DUCT + VENT
Installations up to 4500 ft - Higher altitudes refer to Section 27
Do Not Exceed
Maximum Combined
High
System Length
Input Rate
(Btuh)
Using
4" Air
Duct
45,000
60 ft
& 60,000
80,000 70 ft
110,000
100 ft
to 150,000
175,000
120 ft
200,000
-
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 expansion and
contraction.
HORIZONTAL VENT: (See FIG. 4)
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
for free expansion and contraction
of the system, and free flow of
vent gases.

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. Air Duct
Length
(by Duct Diameter)
Using
5" Air 4" Ø
Duct
80 ft 20 ft
90 ft 20 ft
120 ft 30 ft
140 ft 30 ft
130 ft Use 5"Ø
FIGURE 4: ALLOW FOR HEATER EXPANSION
Max. Vent
Length
Individual: 4"Ø
OR
Combined: 6"Ø
5" Ø
from each
heater
40 ft 20 ft
40 ft 20 ft
50 ft 30 ft
50 ft 40 ft
30 ft 40 ft
- HORIZONTAL VENT - TOP VIEW
17
Example
150,000 Btuh Heater:
Tube Heater Length
1 x 90° elbow (vent)
Straight vent
1 x 90° elbow (duct)
Air Duct: 4" Ø
Combined Length
Max. Allowed
Additional 20' for 5" Ø Air Duct
STS-JZ-F / IQ-F I&O Manual Z83.20-2016
RD: APR 2019
50 ft
5 ft
20 ft
5 ft
17 ft
97 ft
100 ft
IM101220
RL: 20C