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Installation Instructions
CAUTION:
The vent must be installed with the minimum required
f
clearances, and must comply with local codes and
requirements.
CAUTION:
Consideration must be given for degradation of building
f
materials by flue gases. Sidewall termination may require
sealing or shielding of building surfaces with a corrosion
resistant material to protect against combustion product
corrosion. Consideration must be given to wind direction
in order to prevent flue products and/or condensate from
being blown against the building surfaces. If a metal shield
is used it must be a stainless steel material at a minimum
dimension of 20 inches (51 cm). It is recommended that
a retaining type collar be used that is attached to the
building surface to prevent movement of the vent pipe.
8.5 Vent System
This furnace is certified to be installed with one of two possible vent configurations.
1.
Horizontal vent system. This vent system can be installed completely
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 horizontal, vertical, or offset using elbows.
Vent Applications And Termination
When selecting the location for a horizontal combustion air / vent termination, the
following should be considered:
1.
Observe all clearances listed in vent clearances in these instructions.
2.
Termination should be positioned where vent vapors will not damage 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 objectionable.
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 combustion air
pipes terminate in the same atmospheric zone. Refer to Figures 26 or 27.
12" Min.
Exhaust
Figure 25
Termination Configuration - 1 Pipe, No
3 0 |
Maintain 12" minimum
clearance above highest
anticipated snow level.
Maximum 24" above roof.
12" Min.
Exhaust
12" vertical separation
between combustion air
Maintain 12" minimum
intake and vent.
clearance above
highest anticipated
snow level.
Air Intake
Figure 26
Termination Configuration - 2 Pipe
12" MIN.
12" MIN.
Air Intake
Figure 27
Termination Configuration - 2 Pipe Basement
Venting Multiple Units
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 25 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
25. Each furnace must have a separate vent pipe. Under NO circumstances can the
two vent pipes be tied together.
If air from outside is brought in for combustion and ventilation, the confined space
shall be provided with two permanent openings.
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 28 or 29. 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.
Bosch 96% AFUE Condensing Gas Furnace - BTC 770503101 J (06.2023)
12" minimum
below overhang
12" minimum
separation between
bottom of
Exhaust
combustion air pipe
Exhaust
and bottom of vent.
Maintain 12"
minimum clearance
Air Intake
above highest
anticipated snow
level or grade,
whichever is higher.
12" Minimum
below overhang
12" Minimum
separation between
Exhaust
bottom of
combustion air
intake and
bottom of vent
Maintain 12"
Exhaust
minimumclearance
Air Intake
above highest
anticipated snow
level or grade,
whichever is higher
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