International comfort products F9MVE, Installation Instructions Manual

INSTALLATION INSTRUCTIONS

Gas Furnace: (F/G)9MVE

440 01 4400 03

9

Specifications subject to change without notice.

Air for Combustion and

Ventilation

Introduction

Direct Vent (2

−

pipe) Applications

When the furnace is installed as a direct vent (2-pipe) furnace,

no special provisions for air for combustion are required.

However, other gas appliances installed in the space with the

furnace may require outside air for combustion. Follow the

guidelines below to insure that other gas appliances have

sufficient air for combustion.

Non

−

Direct Vent (1

−

pipe) Applications

When the furnace is installed as a non-direct vent (1-pipe)

furnace, it will be necessary to insure there is adequate air for

combustion. Other gas appliances installed with the furnace

may also require air for combustion and ventilation in addition

to the amount of combustion air and ventilation air required for

the furnace. Follow the guidelines below to insure that the

furnace and other gas appliances have sufficient air for

combustion.

Ventilated Combustion Air Applications

When the furnace is installed using the ventilated combustion

air option, the attic or crawlspace must freely communicate with

the outdoor to provide sufficient air for combustion. The

combustion air pipe cannot be terminated in attics or

crawlspaces that use ventilation fans designed to operate

during the heating season. If ventilation fans are present in

these areas, the combustion air pipe must terminate outdoors

as a Direct Vent/ 2-Pipe system.
All air for combustion is piped directly to the furnace from a

space that is well ventilated with outdoor air (such as an attic,

crawlspace, or equipment closet) and the space is well isolated

from the living space or garage.  In addition, other gas

appliances installed in the space with the furnace may require

outside air for combustion. Follow the guidelines below to

insure that the roof or crawlspace walls have sufficient free

area to provide sufficient air for combustion and ventilation for

the furnaces. The guidelines below can be used to insure that

other gas appliances have sufficient air for combustion.
Provisions for adequate combustion, ventilation, and dilution air

must be provided in accordance with:



U.S. Installations:

 Section 9.3 of the NFPA 54/ANSI

Z223.1

−

2012 , Air for Combustion and Ventilation and

applicable provisions of the local building codes.



Canadian Installations: 

Part 8 of

CAN/CSA

−

B149.1

−

2010, Venting Systems and Air

Supply for Appliances and all authorities having

jurisdiction.

CAUTION

!

FURNACE CORROSION HAZARD

Failure to follow this caution may result in furnace

damage.
Air for combustion must not be contaminated by halogen

compounds, which include fluoride, chloride, bromide,

and iodide. These elements can corrode heat

exchangers and shorten furnace life. Air contaminants

are found in aerosol sprays, detergents, bleaches,

cleaning solvents, salts, air fresheners, and other

household products.

WARNING

!

CARBON MONOXIDE POISONING HAZARD

Failure to follow this warning could result in personal

injury or death.
The operation of exhaust fans, kitchen ventilation fans,

clothes dryers, attic exhaust fans or fireplaces could

create a NEGATIVE PRESSURE CONDITION at the

furnace. Make

−

up air MUST be provided for the

ventilation devices, in addition to that required by the

furnace. Refer to the Carbon Monoxide Poisoning

Hazard warning in the venting section of these

instructions to determine if an adequate amount of

make

−

up air is available.

The requirements for combustion and ventilation air depend

upon whether or not the furnace is located in a space having a

volume of at least 50 cubic feet per 1,000 Btuh  (4.8 cubic

meters per kW) input rating for all gas appliances installed in

the space.



Spaces having less than 50 cubic feet per 1,000 Btuh  (4.8

cubic meters per kW) require the 

OUTDOOR

COMBUSTION AIR

METHOD

.



Spaces having at least 50 cubic feet per 1,000 Btuh (4.8

cubic meters per kW)  may use the 

INDOOR

COMBUSTION AIR, STANDARD or KNOWN AIR

INFILTRATION

METHOD

.

Outdoor Combustion Air Method

1. Provide the space with sufficient air for proper

combustion, ventilation, and dilution of flue gases using

permanent horizontal or vertical duct(s) or opening(s)

directly communicating with the outdoors or spaces that

freely communicate with the outdoors.

2.

Figure 6

 illustrates how to provide TWO OUTDOOR

OPENINGS, one inlet and one outlet combustion and

ventilation air openings to the outdoors.

a. One opening 

MUST 

commence within 12-in.

(300 mm) of the ceiling and the second opening

MUST commence within 12-in. (300 mm) of the floor.

b. Size openings and ducts per 

Figure 6

 and 

Table 3

.

c. TWO HORIZONTAL DUCTS require 1 square inch

(25.4 square mm) of free area per 2,000 Btuh (1,100

mm

2

/kW) of combined input for all gas appliances in

the space per 

Figure 6

 and 

Table 3

.

d. TWO OPENINGS OR VERTICAL DUCTS require 1

square inch (25.4 square mm)of free area per 4,000

Btuh (550 mm

2

/kW) for combined input of all gas

appliances in the space per 

Figure 6

 and 

Table 3

.

3. ONE OUTDOOR OPENING requires:

a. 1 sq. in. (25.4 square mm)of free area per 3,000 Btuh

(734 mm

2

/kW) for combined input of all gas

appliances in the space per 

Table 3

 and

b. Not less than the sum of the areas of all vent

connectors in the space.

The opening shall commence within 12-in. (300 mm) of the

ceiling. Appliances in the space shall have clearances of at

least 1-in. (25 mm) from the sides and back and 6-in. (150 mm)

from the front. The opening shall directly communicate with the

outdoors or shall communicate through a vertical or horizontal

duct to the outdoors or spaces (crawl or attic) that freely

communicate with the outdoors.