Carrier 59MN7A Instruction Manual download pdf (Page 41)

A furnace shall not be connected to a chimney flue serving a

separate appliance designed to burn solid fuel.

Other gas appliances with their own venting system may also use

the abandoned chimney as a raceway providing it is permitted by

local code, the current edition of the National Fuel Gas Code and

the vent or liner manufacturer’s installation instructions. Care must

be taken to prevent the exhaust gases from one appliance from

contaminating the combustion air of other gas appliances.

Do not take combustion air from inside the chimney when using

ventilated combustion air or single pipe vent option.

These furnaces can be vented as either direct vent furnace or as

ventilated combustion air system. Each type of venting system is

described below. Common venting between furnaces or other

appliances prohibited.

Materials

U.S.A.

Combustion air and vent pipe, fittings, primers, and solvents must

conform to American National Standards Institute (ANSI)

standards and American Society for Testing and Materials (ASTM)

standards. See Table 11 for approved materials for use in the

U.S.A.

Canada

Special Venting Requirements for Installations in Canada

Installation in Canada must conform to the requirements of

CAN/CSA B149 code. Vent systems must be composed of pipe,

fittings, cements, and primers listed to ULC S636.

Venting Systems

A factory accessory KGAVT vent termination kit must be used for

all direct vent terminations. Termination kits are available for 2--in.

or 3--in. pipe. See Table 10 for available options.

Table 10 – Vent Termination Kit for Direct Vent (2--pipe)

Systems

DIRECT VENT

(2 --- PIPE)

TERMINATION KIT

TERMINATION

SYSTEM

DIAM. OF COMB US-

TION AIR AND VENT

PIPES --- IN. (mm)

2 --- i n . ( 5 1 m m )

Concentric Vent Kit

Single Penetration of

Wall or Roof

1, 1---1/2, 2, or 2---1/2

(24, 36, 51, 64 mm)

3 --- i n . ( 7 6 m m )

Concentric Vent Kit

Single Penetration of

wall or Roof

2---1/2, 3 or 4

(64, 76, 102 mm)

2 --- i n . ( 5 1 m m )

Termination Bracket

Kit

2 ---Pipe Termination

System

1, 1---1/2 or 2

(25, 36, 51 mm)

3 --- i n . ( 7 6 m m )

Termination Bracket

Kit

2 ---Pipe Termination

System

2---1/2, 3 or 4

(64, 76, 102 mm)

Direct Vent / 2-Pipe System

In a direct-vent (2-pipe) system, all air for combustion is taken

directly from outdoor atmosphere, and all flue products are

discharged to outdoor atmosphere. Combustion-air and vent pipes

must terminate together in the same atmospheric pressure zone,

either through the roof or a sidewall (roof termination preferred). A

factory accessory vent termination kit MUST be used in a direct

vent (2-pipe) system. See Fig. 44 for required clearances.

Ventilated Combustion Air Systems

In a ventilated combustion air option, the vent terminates and

discharges the flue products directly to the outdoors similar to a

direct vent system. See Fig. 45 for required clearances.

All air for combustion is piped directly to the furnace from a space

that is well ventilated with outdoor air (such as an attic or crawl

space) and the space is well isolated from the living space or

garage. Combustion air requirements for this option are the same as

the requirements for providing outside air for combustion for a

single pipe vent system. Refer to the “Air For Combustion and

Ventilation Section.

Provisions for adequate combustion, ventilation, and dilution air

must be provided in accordance with:

U.S.A. Installations: Section 9.3 NFPA 54/ANSI Z223.1-2009,

Air for Combustion and Ventilation and applicable provisions of

the local building codes.

Canadian Installations: Part 8 of CAN/CSA-B149.1-10. Venting

Systems and Air Supply for Appliances and all authorities having

jurisdiction.

Locating the Vent Termination

General

NOTE: Termination Requirements for the Provinces of

Alberta and Saskatchewan are located at the end of this

section.

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. 44 for Direct

Vent/2--Pipe system and Fig. 45 for Non--direct Vent/1--Pipe

system. For exterior termination arrangements, refer to Fig. 46 for

Direct Vent/2--Pipe system and Fig. 47 for Non-- Direct/1--Pipe

system.

Roof termination is preferred since it is less susceptible to damage

or contamination, and it has less visible vent vapors. Sidewall

terminations 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 Table 10 for available options.

When determining appropriate location for termination, consider

the following guidelines:

1. Comply with all clearance requirements stated in Fig. 44 or

Fig. 45 per application.

2. Termination or termination kit should be positioned where

vent vapors will not damage plants/shrubs or air condi-

tioning 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.

Direct Vent / 2-Pipe System

Direct vent (2--pipe) vent and combustion air pipes must terminate

outside the structure. Follow all clearances as shown Fig. 44.

Allowable vent and combustion air terminations are shown in Fig.

46.

Ventilated Combustion Air

The vent pipe for a Ventilated Combustion Air System must

terminate outdoors. Follow all vent termination clearances shown

in Fig. 45. Allowable vent terminations are shown in Fig. 47. The

combustion air pipe terminates in a well--ventilated attic or crawl

space. Follow the clearances as shown in Fig. 49. When the

furnace is installed in a well ventilated attic or crawlspace, install

the combustion air pipe as shown in Fig. .43

The combustion air pipe cannot terminate in attics or crawl spaces

that use ventilation fans designed to operate in the heating season.

If ventilation fans are present in these areas, the combustion air

pipe must terminate outdoors as a Direct Vent System.

Termination Requirements for the Provinces of Alberta and

Saskatchewan

The Provinces of Alberta and Saskatchewan require a minimum

unobstructed distance of 4 ft. (1.2 M) from the foundation to the

property line of the adjacent lot for vent termination of any

appliance with an input over 35,000 btuh. If there is less than 4 ft.

59MN7A

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Carrier 59MN7A Instruction Manual Page 41

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