Reliant FVIR GAS WATER HEATER Technical Information PDF herunterladen (Seite 14)

BASIC INSTALLATION & OPERATION

All Air from Inside the Building: When additional air

is to be provided to the conﬁ ned area from additional

room(s) within the building, the total volume of the

room(s) must be of sufﬁ cient size to properly provide

the necessary amount of fresh air to the water heater

and other gas utilization equipment in the area. Each

of the two openings shall have a minimum free area of

1 square inch per 1,000 BTUH of the total input rating

of all gas utilization equipment in the conﬁ ned area, but

not less than 100 square inches for each opening.

Figure 8

All Air from Outdoors: Outdoor fresh air can be

provided to a confined area either directly or by the use

of vertical and horizontal ducts. The fresh air can be

taken from the outdoors or from crawl or attic spaces

that freely communicate with the outdoors. Attic or

crawl spaces cannot be closed and must be properly

ventilated to the outside.

Ductwork must be of the same cross-sectional area

as the free area of the opening to which they connect.

The minimum dimension of rectangular air ducts

cannot be less than three inches.

The size of each of the two openings is determined by

the method in which the air is to be provided. Refer to

the table below to calculate the minimum free area for

each opening.

Louvers and Grilles: In calculating free area for

ventilation and combustion air supply openings,

consideration must be given to the blocking effect of

protection louvers, grilles, and screens. These devices

can reduce airflow, which in turn may require larger

openings to achieve the required minimum free area.

Screens must not be smaller than 1/4” mesh. If the

free area through a particular design of louver or grille

is known, it should be used in calculating the specified

free area of the opening. If the design and free area

are not known, it can be assumed that most wood

louvers will allow 20 - 25% of free area while metal

louvers and grilles will allow 60 - 75% of free area.

Louvers and grilles must be locked open or

interconnected with the equipment so that they are

opened automatically during equipment operation.

Keep louvers and grilles clean and free of debris or

other obstructions.

Minimum Free Area of Permanent Openings for

Ventilation and Combustion Air Supply - All Air from

Outdoors Only.

Based on total BTUH input rating for all utilizing

equipment within the conﬁ ned space.

Opening Source

Minimum Free Area

Per Opening (sq. in.)

Reference

Drawing

*Direct to outdoors 1 sq. in, per 4000 BTUH Figure 9

Vertical Ducts 1 sq. in, per 4000 BTUH Figure 10

Horizontal Ducts 1 sq. in, per 2000 BTUH Figure 11

Single Opening 1 sq. in, per 3000 BTUH Figure 12

Example: A water heater with an input rating of 50,000 BTUH

using horizontal ducts would require each opening to have a

minimum free area of 25 square inches.

Minimum free area = 50,000 BTUH x 1 sq. in. / 2000 BTUH = 25

sq. in.

These openings connect directly with the outdoors

through a ventilated attic, a ventilated crawl space, or

through an outside wall.

Consult the local codes of your area for specific

ventilation and combustion air requirements

ABLE VENT

TO OUTDOORS

INSTALL ABOVE

INSULATION

CONFINED

SPACE

ALTERNATE

AIR INLET

OUTLET

AIR TO

ATTIC 1 SQ.

INCH PER

4000 BTUH

INLET AIR FROM

THE CRAWL SPACE

OPEN

FOUNDATION

VENT

1 SQ. INCH PER

4000 BTUH

100 SQ. INCH MINIMUM (EACH)

ALL AIR FROM OUTDOORS: INLET AIR FROM VENTILATED

CRAWL SPACE/OUTLET AIR TO VENTILATED ATTIC

GABLE VENT

TO OUTDOORS

INSTALL ABOVE

INSULATION

CONFINED

SPACE

OUTLET AIR TO

ATTIC 1 SQ. INCH

PER 4000 BTUH -

100 SQ. INCH MIN.

(EACH)

INLET AIR DUCT

1 SQ. INCH PER

4000 BTUH - 100

SQ. INCH MIN.

(EACH)

12” MAXIMUM

ALL AIR FROM OUTDOORS THROUGH VENTILATED ATTIC

CONFINED

SPACE

PERMANENT

OPENINGS

1 SQUARE

INCH/1000

BTUH

(MINIMUM

100 SQ. IN.

FOR EACH

OPENING)

Figure 9

Figure 10

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 43 44

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