Bryant Condensing Gas 355CAV User Manual

Page 37

HORIZONTAL TO ROOF

HORIZONTAL TO SIDEWALL

VERTICAL TO SIDEWALL

VERTICAL TO ROOF

VENT PIPE

COMBUSTION-AIR PIPE

VENT PIPE

COMBUSTION-AIR PIPE

VENT PIPE

COMBUSTION-AIR PIPE

VENT PIPE

″ MIN

(304.8mm)

″ MIN

(304.8mm)

NOTE: A 12-in. (304.8mm) minimum offset pipe section is

recommended with short (5 to 8 ft) vent systems. This
recommendation is to reduce excessive condensate droplets

A96230

Fig. 44 -- Short Vent (5 to 8 Ft or 1.5M -- 2.4M) System

NOTE: Starting at furnace, slope vent pipe a minimum of
1/4--in. (6.4mm) per linear ft back toward furnace with no sags
between hangers.

VENT TERMINATION

General
Combustion--air (direct vent/2--pipe system only) and vent pipe

must terminate outside structure, either through sidewall or roof.
For vent termination clearance, refer to Fig. 34 for Direct Vent/2--

Pipe system and Fig. 35 for Ventilated Combustion Air option.
Roof termination is preferred since it is less susceptible to damage
or contamination, and it has less visible vent vapors. Sidewall

termination require sealing or shielding of building surfaces with
a corrosive resistance material due to corrosive combustion

products of vent system.
NOTE: (Direct Vent/2--Pipe system ONLY) A factory accessory
termination kit MUST be used. See section “Vent Termination Kit
(Direct Vent/2--Pipe System Only)” in this instruction.
When determining appropriate location for termination, consider
the following guidelines:

1. Comply with all clearance requirements stated in Fig. 34

or Fig. 35 per application.

2. Termination or termination kit should be positioned where

vent vapors will not damage plants/shrubs or air
conditioning equipment.

3. Termination or termination kit should be positioned so that

it will not be affected by wind eddy, such as inside

building corners, nor by recirculation of flue gases,
airborne leaves, or light snow.

4. Termination or termination kit should be positioned where

it will not be damaged by or subjected to foreign objects
such as stones, balls, etc.

5. Termination or termination kit should be positioned where

vent vapors are not objectionable.

Extended Exposed Sidewall Pipes
Sidewall combustion air pipe termination (direct vent/2--pipe
system only) and vent pipe termination may be extended beyond

area shown in Fig. 36 or in Fig. 37 per application in outside

ambient by insulating pipe as indicated in Table 6.

1. Determine combustion

air pipe

diameter (direct

vent/2--pipe system only) and vent pipe diameter, as stated
above, using total pipe length and number of elbows.

2. Using winter design temperature (used in load

calculations), find appropriate temperature for your
application and furnace model.

3. Determine required insulation thickness for exposed pipe

length(s).

NOTE: Pipe length(ft) specified for maximum pipe lengths
located in unconditioned spaces cannot exceed total allowable
pipe length as specified in Table 6.

355C