Whirlpool WGFD293 Instruction Manual download pdf (Page 17)

Direct Vent (Dual Pipe) Piping

The inlet air screens provided in the installation instruction packet

are available for the installer to use in the inlet of the combustion

air pipe to prevent animals from building nests in the combustion

air pipe. Installation of screens, while strongly recommended, is

not required and will not affect performance of the furnace.

Direct vent installations require both a combustion air intake and

a vent/flue pipe. The pipes may be run horizontally and exit

through the side of the building or run vertically and exit through

the roof of the building. The pipes may be run through an existing

unused chimney; however, they must extend a minimum of 12"

(30.5 cm) above the top of the chimney. The space between the

pipes and the chimney must be closed with a weathertight,

corrosion resistant flashing. Both the combustion air intake and

vent/flue pipe terminations must be in the same atmospheric

pressure zone. See “Termination Locations,” or “Concentric Vent

Termination” in this section for specific details on termination

constructions. For details concerning connection of pipes to the

furnace, refer to the “Standard Furnace Connections” or

“Alternate Furnace Connections” in this section.

Vent/Flue and Combustion Air Pipe

Lengths and Diameters

Refer to the following table for applicable length, elbows and pipe

diameter for construction of the vent/flue and combustion air

intake pipe systems of a direct vent (dual pipe) installation. The

number of elbows tabulated represents the number of elbows

and/or tees in each vent/flue and combustion air intake pipe.

Elbows and/or tees used in the terminations must be included

when determining the number of elbows in the piping systems.

If the combustion air intake pipe is to be installed above a

finished ceiling or other area where dripping of condensate will

be objectionable, insulation of the combustion air pipe may be

required. Use ¹⁄₂" (1.3 cm) thick closed-cell foam insulation where

required.

Vent/Flue and Combustion Air Pipe Terminations

The vent/flue and combustion air pipes may terminate vertically, as through a roof, or horizontally, as through an outside wall.

Upflow

Direct Vent (Dual Pipe) Maximum Allowable Length of Vent/Flue and Combustion Air Intake Pipe—ft (m)

Number of Elbows

Unit Input

(Btu)

Termination

Style

Pipe—

in. (cm)1 2 3 4 5678

45,000 Standard 2 or 2¹⁄₂

(5.12 or 6.4)

71 (21.6) 68 (20.7) 65 (19.8) 62 (18.9) 59 (18) 56 (17.1) 53 (16.2) 50 (15.2)

Alternate 2 or 2¹⁄₂

(5.12 or 6.4)

58 (17.7) 55 (16.8) 52 (15.8) 49 (14.9) 46 (14) 43 (13.1) 40 (12.2) 37 (11.3)

70,000 Standard 2 or 2¹⁄₂ (5.12

or 6.4)

49 (14.9) 46 (14) 43 (13.1) 40 (12.2) 37 (11.3) 34 (10.4) 31 (9.5) 28 (8.5)

3 (7.6) 71 (21.6) 68 (20.7) 65 (19.8) 62 (18.9) 59 (18) 56 (17.1) 53 (16.2) 50 (15.2)

Alternate 2 or 2¹⁄₂ (5.12

or 6.4)

36 (11) 33 (10.1) 30 (9.2) 27 (8.2) 24 (7.3) 21(6.4) 18 (5.5) 15 (4.6)

3 (7.6) 57 (17.4) 54 (16.5) 51 (15.5) 48 (14.6) 45 (13.7) 42 (12.8) 39 (11.9) 36 (11)

90,000 Standard 3 (7.6) 71 (21.6) 68 (20.7) 65 (19.8) 62 (18.9) 59 (18) 56 (17.1) 53 (16.2) 50 (15.2)

Alternate 3 (7.6) 57 (17.4) 54 (16.5) 51 (15.5) 48 (14.6) 45 (13.7) 42 (12.8) 39 (11.9) 36 (11)

115,000 Standard 3 (7.6) 49 (14.9) 46 (14) 43 (13.1) 40 (12.2) 37 (11.3) 34 (10.4) 31 (9.5) 28 (8.5)

Alternate 3 (7.6) 35 (10.7) 32 (9.8) 29 (8.8) 26 (7.9) 23 (7) 20 (6.1) 17 (5.2) 14 (4.3)

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 51 52

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Whirlpool WGFD293 Instruction Manual Page 17

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