Schwank premierSchwank IQ - Manual (Page 33)

33
STS-JZ-F / IQ-F I&O Manual
IM101220
RD: AUGUST 2014
RL: 18A
V ERTICAL VENT THROUGH THE ROOF :
It is the sole responsibility of the installer to ad-
here to all current local codes and/or ANSI
Z223.1 / CSA.B149.1 latest editions for all vent-
ing requirements, and practices.
 Use an approved ‘B-vent’ termination cap as
supplied by the manufacturer of the approved
‘B-vent’.
 When vent and combustion air are taken
through the roof, the exhaust vent should al-
ways terminate higher than the combustion
air intake, to prevent recycling the products of
combustion back into the heater
 At most a quantity of three 90° elbows can be
installed in a vertical vent
Approved
Cap
Approved
‘B’ Vent
24” Min
60 cm
12
9
If roof slope exceeds 9:12
consult NFPA-54 ANSI
Z223.1 or CSA-B149.1
FIGURE 22
Up
to
12A. Combined System Length: Tube Heater + Vent + Combustion Air Duct :
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. Vent
Length
Individual: 4ӯ
OR
Combined: 6ӯ
4”
Air Duct 5” Air Duct
4” Ш 5” Ш
45,000
& 60,000
60 ft 80 ft 20 ft 40 ft 20 ft
80,000 70 ft 90 ft 20 ft 40 ft 20 ft
100,000 60 ft 80 ft 30 ft 50 ft 30 ft
110,000
to 150,000
100 ft 120 ft 30 ft 50 ft 30 ft
175,000
& 200,000
120 ft 140 ft 30 ft 50 ft 40 ft
Max. Air Duct
Length
(by Duct Diameter)
Example
150,000 Btuh Heater:
Tube Heater Length 50 ft
1 x 90° elbow (vent) 5 ft
Straight vent 20 ft
1 x 90° elbow (duct) 5 ft
Air Duct: 4” Ø 17 ft
Combined Length 97 ft
Max. Allowed 100 ft
Additional 20’ for 5” Ø Air Duct
INSTALLATIONS UP TO 4500 FEET (Higher altitudes refer to Section 27)