5715184-BIM-A-0519
Johnson Controls Ducted Systems
21
VENT SYSTEM
This furnace is certified to be installed with one of two possible vent
configurations.
•
Horizontal vent system. This vent system can be installed com-
pletely horizontal or combinations of horizontal, vertical, or offset
using elbows.
•
Vertical vent system. This vent system can be installed com-
pletely vertical or a combination of horizontal, vertical, or offset
using elbows.
VENT APPLICATIONS AND TERMINATION
When selecting the location for a combustion air/vent termination, the
following must be considered:
1.
Observe all clearances listed in vent clearances in these instruc-
tions.
2.
Termination must be positioned where vent vapors will not damage
plants or shrubs or air conditioning equipment.
3.
Termination must be located where it will not be affected by wind
gusts, light snow, or airborne leaves or allow recirculation of flue
gases.
4.
Termination must be located where it will not be damaged or
exposed to flying stones or balls, for example.
5.
Termination must 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 Fig-
ures 23 or 24.
VENTING MULTIPLE UNITS
Multiple units can be installed in a space or structure as a two-pipe con-
figuration.
The combustion air side of the two-pipe configuration shown in Figures
23 and 24 can be installed so the combustion air pipe terminates as
described in outdoor combustion air or ventilated combustion air sec-
tions in these instructions. Follow the instructions for outdoor combus-
tion air or ventilated combustion air and the instructions for installing the
vent system with the vent terminating as shown in Figures 25 or 26. The
two-pipe system must have a separate combustion air pipe and a sepa-
rate 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.
WARNING
Condensation in Intake Pipe
Installations where the furnace and intake pipe are to be located in a
conditioned space and in a region that may have hot, humid weather
extending several consecutive days will have condensate form in the
intake pipe. Use of the supplied intake drain will ensure that any con-
densate will be safely diverted away from the internal components of
the furnace. Proper venting installation (of both intake and exhaust)
and sealing any equipment air leaks that might contact the intake pipe
will help reduce condensation.
FIGURE 23:
Termination Configuration - 2 Pipe
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FIGURE 24:
Termination Configuration - 2 Pipe Basement
FIGURE 25:
Double Horizontal Combustion Air Intake and Vent
Termination
FIGURE 26:
Double Vertical Combustion Air Intake and Vent
Termination
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