Amana AMH8 Operations Instructions download pdf (Page 22)

PRODUCT DESIGN

COMBUSTION AND VENTILATION AIR

REQUIREMENTS

WARNING

OSSIBLE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH MAY OCCUR

IF THE FURNACE IS NOT PROVIDED WITH ENOUGH FRESH AIR FOR PROPER

COMBUSTION AND VENTILATION OF FLUE GASES. MOST HOMES REQUIRE

OUTSIDE AIR BE SUPPLIED TO THE FURNACE AREA.

Improved construction and additional insulation in buildings

have reduced heat loss by reducing air infiltration and es-

cape around doors and windows. These changes have

helped in reducing heating/cooling costs but have created

a problem supplying combustion and ventilation air for gas

fired and other fuel burning appliances. Appliances that

pull air out of the house (clothes dryers, exhaust fans, fire-

places, etc.) increase the problem by starving appliances

for air.

If this furnace is to be installed in the same space with

other gas appliances, such as a water heater, ensure there

is an adequate supply of combustion and ventilation air for

the other appliances. Refer to the latest edition of the Na-

tional Fuel Gas Code NFPA 54/ANSI Z223.1 (Section 9.3),

or CAN/CGA B149 Installation Codes (Sections 7.2, 7.3,

or 7.4), or applicable provisions of the local building codes

for determining the combustion air requirements for the

appliances.

Most homes will require outside air be supplied to the fur-

nace area by means of ventilation grilles or ducts connect-

ing directly to the outdoors or spaces open to the outdoors

such as attics or crawl spaces.

The following information on air for combustion and ventila-

tion is reproduced from the National Fuel Gas Code NFPA

54/ANSI Z223.1 Section 9.3.

9.3* Air for Combustion and Ventilation.

9.3.1 General.

9.3.1.1 Air for combustion, ventilation, and dilution of flue gases for

appliances installed in buildings shall be obtained by application of one of

the methods covered in 9.3.2 through 9.3.6. Where the requirements of

9.3.2 are not met, outdoor air shall be introduced in accordance with methods

covered in 9.3.3 through 9.3.6.

Exception No. 1: This provision shall not apply to direct vent appli-

ances.

9.3.1.2 Appliances of other than natural draft design and other than Cat-

egory 1 vented appliances shall be provided with combustion, ventilation,

and dilution air in accordance with the appliance manufacturer’s instruc-

tions.

9.3.1.3 Appliances shall be located so as not to interfere with proper

circulation of combustion, ventilation, and dilution air.

9.3.1.4 Where used, a draft hood or a barometric draft regulator shall be

installed in the same room or enclosure as the appliance served so as to

prevent any difference in pressure between the hood or regulator and the

combustion air supply.

9.3.1.5 Makeup air requirements for the operation of exhaust fans, kitchen

ventilation systems, clothes dryers, and fireplaces shall be considered in

determining the adequacy of a space to provide combustion air require-

ments.

9.3.2 Indoor Combustion Air. The required volume of indoor air shall

be determined in accordance with the method in 9.3.2.1 or 9.3.2.2 except

that where the air infiltration rate is known to be less than 0.40 ACH, the

method in 9.3.2.2 shall be used. The total required volume shall be the

sum of the required volume calculated for all appliances located within

the space. Rooms communicating directly with the space in which the

appliances are installed through openings not furnished with doors, and

through combustion air openings sized and located in accordance with

9.3.2.3, are considered a part of the required volume.

9.3.2.1* Standard Method. The minimum required volume shall be 50

per 1,000/Btu/hour (4.8m

/kW).

9.3.2.2* Known Air Infiltration Rate Method. Where the air infiltra-

tion rate of a structure is known, the minimum required volume shall be

determined as follows:

(1) For appliances other than fan-assisted, calculate using the following

equation:

21 ft

other

Required Volume

other

> ________ _________

ACH 1000 Btu/hr

(2) For fan-assisted appliances, calculate using the following equation:

15 ft

fan

Required Volume

fan

> ________ _________

ACH 1000 Btu/hr

where:

other

= all appliances other than fan-assisted input in Btu per hour

fan

= fan-assisted appliances input in Btu per hour

ACH = air change per hour (percent of volume of space exchanged

per hour, expressed as a decimal)

(3) For purposes of this calculation, an infiltration rate greater than 0.60

ACH shall not be used in the equations in 9.3.2.2(1) and 9.3.2.2(2).

9.3.2.3 Indoor Opening Size and Location. Openings used to connect

indoor spaces shall be sized and located in accordance with the following:

(1)* Combining spaces on the same story. Each opening shall have a

minimum free area of 1 in.

/1000Btu/hr (2200 mm

/kW) of the total

input rating of all appliances in the space but not less than 100 in.

(0.60m

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

top, and one opening shall commence within 12 in. (300 mm) of the

bottom, of the enclosure [see Figure A.9.3.2.3(1)]. The minimum

dimension of air openings shall be not less than 3 in. (80 mm).

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