Special Vent Systems (Svs) - Rheem 801S Series Installation Instructions Manual

Upflow/horizontal single stage gas furnaces

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Table of Contents

COMBUSTION AND VENTILATION AIR (cont.)

VERTICAL VENT SYSTEMS:

1. A gas vent shall terminate above the roof surface with a listed

cap or listed roof assembly. Gas vents 12 inches in size or

smaller with listed caps shall be permitted to be terminated in

accordance with Figure 15, provided they are at least 8 feet

from a vertical wall or similar obstruction. All other gas vents

shall terminate not less than 2 feet above the highest point

where they pass through the roof and at least 2 feet higher

than any portion of a building within 10 feet.

2. A type B-1 gas vent shall terminate at least 5 feet in vertical

height above the highest connected equipment draft hood or

flue collar.

3. Must rise

" per foot away from the furnace on horizontal runs

and be supported with straps or hangers so it has no sags or

dips. Supports at 4 foot intervals and at all elbows are recom-

mended.

4. The vent connector must be mechanically fastened to the out-

let collar of the furnace with at least (2) sheet metal screws ex-

cept vent connectors that are B-1 material. These shall be

assembled in accordance with the manufacturer's instructions.

See Figures 16 and 17.

5. Any angle greater than 45 degrees from the vertical is consid-

ered horizontal. The total horizontal distance of a vent plus the

horizontal vent connector serving draft-hood equipped appli-

ances shall not be greater than 75 percent of the vertical

height of the vent.

FIGURE 15

TYPICAL VENTING WITH "B-1" VENT

LISTED CAP

LISTED GAS VENT

- MINIMUM ALLOWABLE HEIGHT

FROM ROOF TO DISCHARGE OPENING

ST-A1220-24

ROOF PITCH = X/12

ROOF PITCH

"H" (MIN.) FT.

FLAT TO 6/12

1.0

OVER 6/12 TO 7/12

1.25

OVER 7/12 TO 8/12

1.5

OVER 8/12 TO 9/12

2.0

OVER 9/12 TO 10/12

2.5

OVER 10/12 TO 11/12

3.25

OVER 11/12 TO 12/12

4.0

OVER 12/12 TO 14/12

5.0

OVER 14/12 TO 16/12

6.0

OVER 16/12 TO 18/12

7.0

OVER 18/12 TO 20/12

7.5

OVER 20/12 TO 21/12

8.0

Single appliance venting of a fan assisted furnace into a tile-lined

masonry chimney is prohibited. The chimney must be lined with

either Type B vent or with a listed, single wall, metal lining sys-

tem. Reference National Fuel Gas Code, ANSI Z223.1. See Fig-

ure 18 for typical B-1 vent chase.

NOTE: A chimney adapter is available as an accessory (see ac-

cessory section of this manual). Follow manufacturer's instruc-

tions.

WARNING

DO NOT CONNECT THIS FURNACE TO A CHIMNEY USED

TO VENT A SOLID FUEL APPLIANCE (WOOD OR COAL).

VENTING WITH A SOLID FUEL APPLIANCE CAN LEAD TO

IMPROPER FUNCTIONING OF THE UNIT, AND DUE TO

SOOTING, THE POSSIBILITY OF FIRE RESULTING IN

PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.