Schwank ultraSchwank EIH - Manual (Page 25)

25
UHE-F / EIH-F I&O Manual
IM100205
RD: MAY 2014
RL: 06A
V ERTICAL VENT THROUGH THE ROOF :
It is the sole responsibility of the installer to
adhere to all current local codes and/or ANSI
Z223.1 / CSA.B149.1 latest editions for all
venting requirements, and practices.
 Use an approved ‘B-vent’ termination cap
as supplied by the manufacturer of the ap-
proved ‘B-vent’.
 When vent and combustion air are taken
through the roof, the exhaust vent should
always terminate higher than the combus-
tion 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
A p p r o v e d
‘B’ Vent
24”
60 cm
12
9
If roof slope exceeds 9:12
consult NFPA-54 ANSI
Z223.1 or CSA-B149.1
FIGURE 17
Up
to
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
60,000 60 ft 80 ft 30 / 50 30
90,000 80 ft 100 ft 30 / 50 40
130,000 100 ft 120 ft 30 / 50 40
160,000 100 ft 120 ft 30 / 50 40
200,000 120 ft 140 ft 30 / 50 50
Example
160,000 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
11A. 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
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 maximum
length of individual vent or combustion air duct