Schwank builderSchwank S100U - Manual (Page 52)

52
S100-F / ITB-F I&O Manual
IM101230
RD: SEP 2014
RL: 11A
26. 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 LP: Minimum 8 ft (244 cm)
MAXIMUM SYSTEM LENGTH (includes:
Tube Heater length + combustion air duct + vent
):
 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
Input
(Btuh)
Do Not Exceed
Maximum Combined
System Length
Max. Air Duct
Length (ft)
(by Duct Diameter)
Max. Vent
Length (ft)
Individual: 4ӯ
Combined: 6ӯ
4”
Air Duct 5” Air Duct
4” Ш 5” Ш
45,000
& 60,000
40 ft 60 ft 20 ft 40 ft 20 ft
80,000 50 ft 70 ft 20 ft 40 ft 20 ft
100,000 40 ft 60 ft 30 ft 50 ft 30 ft
110,000
to 150,000
80 ft 100 ft 30 ft 50 ft 30 ft
175,000
& 200,000
100 ft 120 ft 30 ft 50 ft 40 ft
Example
150,000 Btuh Heater:
Tube Heater Length 40 ft
1 x 90° elbow (vent) 5 ft
Straight vent 15 ft
1 x 90° elbow (duct) 5 ft
Air Duct: 4” Ø 13 ft
Combined Length 78 ft
Max. Allowed 80 ft
Additional 20’ for 5” Ø Air Duct
TOTAL SYSTEM LENGTH RESTRICTIONS:
INSTALLATIONS ABOVE 4500 FEET (Lower altitudes refer to Section 12A)