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27. HIGH ALTITUDE INSTALLATION
Canada: Heaters can be installed to an altitude of 4500 ft without revision.
To install above 4500 feet refer to recommendation of local authority having jurisdiction.
•
USA: The factory installed orifice is approved for normal altitude up to 2000 ft.
When this appliance is installed above an altitude of 2000 feet in the USA , the input must be
de-rated by 4% for each 1000 ft . Refer to the table next page for orifice sizing and restrictions
that apply to high altitude installation. Check with your local authority regarding de-rating.
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 Propane: Minimum 8 ft
•
(244 cm)
MAXIMUM SYSTEM LENGTH (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-
mum length of individual vent or combustion air duct
TABLE 8: TOTAL SYSTEM LENGTH RESTRICTIONS:
INSTALLATIONS ABOVE 4500 FEET (Lower altitudes refer to Section 12A)
Do Not Exceed
Maximum Combined
System Length
Model
With 4" Ø
Air Duct
80/60
50 ft
110/75
80 ft
to 155/110
175/125
100 ft
& 200/140
Tube Heater length + combustion air duct + vent
Max. Air Duct
Length (ft)
(by Duct Diameter)
With 5" Ø
4" Ø
Air Duct
70 ft
20 ft
100 ft
30 ft
120 ft
30 ft
Max. Vent
Length (ft)
Individual: 4"Ø
Combined: 6"Ø
5" Ø
40 ft
20 ft
50 ft
40 ft
50 ft
50 ft
53
Example
155/110 Model:
Tube Heater Length 40 ft
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
SPW2, STW2(S) / IWP2, IW2(S) I&O Manual
RD: APR 2019
):
5 ft
15 ft
5 ft
13 ft
78 ft
80 ft
IM170629
RL: 03C
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