Bryant 345MAV User Manual

Page 24

CAUTION:

When vent pipe is exposed to temperatures

below freezing, such as when it passes through an
unheated space or when a chimney is used as a raceway,
pipe must be insulated as described in Table 5 with
Armaflex-type insulation.

WARNING:

Vent pipes must be airtight and watertight.

Failure to follow this warning could result in property
damage, personal injury, or death.

NOTE:

The minimum vent pipe length for these furnaces is 5 ft.

Short pipe lengths (5-8 ft) may discharge water droplets. These
droplets may be undesirable, and a 12-in. minimum offset pipe
section is recommended to reduce excessive droplets from exiting
vent pipe outlet. (See Fig. 32.)

NOTE:

Do not count elbows or pipe sections in terminations or

within furnace. See shaded areas in Fig. 34.

EXAMPLE:

An 036080 size furnace located in Indianapolis, elevation 650
ft above sea level, could be installed in an application requiring
3 elbows and 32 ft of vent pipe. Table 4 indicates this
application would allow a 2-in. diameter vent pipe. At 0-2000
ft elevation, 2-in. pipe is good for up to 35 ft with 3 elbows. If
same installation were in Albuquerque, elevation 5250 ft above

sea level, installation would require 2-1/2 in. vent pipe. At
5001- to 6000-ft elevation, 2-in. pipe is allowed for up to 23 ft
with 3 elbows, but 2-1/2 in. pipe can be used for up to 70 ft with
3 elbows.

Install vent pipe as follows:

1. Determine location of vent pipe connection to inducer

housing as shown in Fig. 28 for application.

2. Reposition neoprene inducer housing outlet cap and clamp

to appropriate unused inducer housing connection. Tighten
clamp.

WARNING:

Inducer housing outlet cap must be in-

stalled and fully seated against inducer housing. Clamp
must be tightened to prevent any condensate leakage.
Failure to follow this warning could result in electrical
shock, fire, personal injury, or death.

3. Install pipe support (factory-supplied in loose parts bag)

into selected furnace casing vent pipe hole. Pipe support
should be positioned at bottom of casing hole.

4. Insert 2-in. diameter pipe into inducer housing through

neoprene coupling and clamp in inducer housing. Tighten
clamp.

Fig. 32—Short Vent (5 to 8 Ft) System

A96189

HORIZONTAL TO ROOF

HORIZONTAL TO SIDEWALL

VERTICAL TO SIDEWALL

VERTICAL TO ROOF

VENT PIPE

″

MIN

″

MIN

″

MIN

″

MIN

NOTE: A 12-In. minimum offset pipe section is recommended with

short (5 to 8 ft) vent systems. This recommendation is to reduce
excessive condensate droplets from exiting the vent pipe.

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