Schwank infrasave SET Series Installation & Owner's Manual page 50

27.HIGH ALTITUDE INSTALLATION - Total System Length Restrictions
NOTE: Installations above 4,500 ft: Restrict the Total Combined System Length as indi-
cated in the TOTAL SYSTEM LENGTH RESTRICTIONS Table below.
MINIMUM VENT LENGTH: (Vented or Unvented [indirect mechanical ventilation])
Minimum vent length of 3 ft (91 cm) is required (NOTE: 200,000
•
cm)
HIGH ALTITUDE MAXIMUM SYSTEM LENGTH (above 4,500 ft) :
Tube Heater length + combustion air duct + vent
includes:
Each 90° elbow in the system has an equivalent length of 5 ft.
•
A maximum of 2 elbows are allowed in any portion (duct, tube heater, vent) with the ex-
•
ception of up to three 90° elbows in a vertical vent run through the roof
Combustion air duct may be 4" or 5" diameter and is not to exceed lengths in table below
•
• Exceeding the allowable lengths in the table below can create combustion and/or conden-
sation problems and will void CSA Certification and the heater warranty.
• Do not exceed the Maximum Combined System Length regardless of the allowed maxi-
TOTAL SYSTEM LENGTH RESTRICTIONS:
INSTALLATIONS ABOVE 4,500 FEET (Lower altitudes refer to Section 11A)
Do Not Exceed
Max. Combined
SET / ITT
System Length*
Model
With 4" Ø
Air Duct
80 / 60 60 ft
110 / 75 80 ft
130 / 90 80 ft
155 / 110 80 ft
175 / 125 100 ft
200 / 140 100 ft
SET(U) / ITT(U) Manual
IM091221
RD: APR 2019
RL: 13C
Max. Vent
Length*
Individual: 4" Ø
With 5" Ø
Combined: 6" Ø
Air Duct
80 ft Up to 20 ft
100 ft Up to 30 ft
100 ft Up to 30 ft
100 ft Up to 30 ft
120 ft Up to 40 ft
120 ft Up to 40 ft
:
Max. Air Duct
Length*
(by Duct Diameter)
4" Ø 5" Ø
20 ft 40 ft
20 ft 40 ft
20 ft 40 ft
30 ft 50 ft
30 ft 50 ft
30 ft 50 ft
50
: Minimum 8 ft (244
Propane
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
Up To Additional 20' if 5"Ø Air
40 ft
5 ft
15 ft
5 ft
13 ft
78 ft
80 ft
Duct