Installation Guide

20
I&O manual
1. Horizontal vent system. This vent system can be installed com-
pletely horizontal or combinations of horizontal, vertical, or offset
using elbows.
2. Vertical vent system. This vent system can be installed completely
vertical or a combination of hori zontal, vertical, or offset using
elbows.
tions.
2. Termination should be positioned where vent vapors will not dam-
age plants or shrubs or air conditioning equipment.
3. Termination should be located where it will not be affected by wind
gusts, light snow, airborne leaves or allow recirculation of flue
gases.
4. Termination should be located where it will not be damaged or
exposed to flying stones, balls, etc.
5. Termination should be positioned where vent vapors are not objec-
tionable.
6. Horizontal portions of the vent system must slope upwards and be
supported to prevent sagging.
7. Direct vent systems must be installed so the vent and the combus-
tion air pipes terminate in the same atmospheric zone. Refer to
Figures 21 or 22.
Fig 20: Termination Configuration - 1 Pipe
Fig 21: Termination Configuration - 2 Pipe
12” Min.
12” Min.
Maintain 12” minimum clearance
above highest anticipated snow level.
Maximum 24” above roof.
Maintain 12” minimum
clearance above
highest anticipated
snow level.
12” vertical separation
between combustion air
intake and vent.
12” minimum
below overhang
12” minimum
separation between
bottom of
combustion air pipe
and bottom of vent.
Maintain 12”
minimum clearance
above highest
anticipated snow
level or grade,
whichever is higher.
Fig 22: Termination Configuration - 2 Pipe Basement
Fig 23: Double Horizontal Combustion Air Intake and Vent
Termination
Fig 24: Double Vertical Combustion Air Intake and Vent
Termination
12” MIN.
12” MIN.
12” Minimum
below overhang
12” Minimum
separation between
bottom of
combustion air
intake and
bottom of vent
Maintain 12”
minimumclearance
above highest
anticipated snow
level or grade,
whichever is higher
VENT
2”
MIN.
COMBUSTION AIR
MIN.
6”
Multiple units can be installed in a space or structure as either a
single pipe configuration or a two-pipe configuration.
The combustion air side of the single pipe configuration shown in
Figure 20 is referred to in these instructions as ambient combustion
air supply. Follow the instructions for ambient combustion air
installations, paying particular attention to the section on air source
from inside the building. The vent for a single pipe system must be
installed as specified in the venting section of these instructions with
the vent terminating as shown in Figure 20. Each furnace must have
a separate vent pipe. Under NO in Figure 20. Each furnace must
have a separate vent pipe. Under NO circumstances can the two
vent pipes be tied together.
The combustion air side of the two-pipe configuration shown in
Figure 21 can be installed so the combustion air pipe terminates as
described in outdoor combustion air or ventilated combustion air
sections in these instructions. Follow the instructions for outdoor
combustion air or ventilated combustion air and the instructions for
installing the vent system with the vent terminating as shown in
Figures 23 or 24. The two-pipe system must have a separate
combustion air pipe and a separate vent pipe for each furnace.
Under NO circumstances can the two combustion air or vent pipes
be tied together. The combustion air and vent pipes must terminate
in the same atmospheric zone.
1. Observe all clearances listed in vent clearances in these instruc-
This furnace is certified to be installed with one of two possible
vent configurations.
7.5 Vent System
Vent Applications And Termination
Venting Multiple Units
When selecting the location for a horizontal combustion air / vent
termination, the following should be considered: