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Whirlpool WFCU Installation Instructions Manual page 12

90+ gas furnace
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Direct Vent Installation - Counterflow Models
Refer to appropriate tables for proper pipe size, vent length
and the number of elbows allowed, and air intake length and
the number of elbows allowed.
Refer to the "Materials" section for the proper venting
material.
Do not install the inlet air restrictor plate in any direct vent
installation. The inlet air restrictor plate (see "Inlet Air
Restrictor Plate" section) supplied with this furnace is to be
used only in non-direct vent applications.
The flue pipe screen, designed to keep objects out of the flue
pipe (see "Flue Pipe Screen" section), should be installed at
the termination of the flue pipe.
NOTE: Do not place an additional flue pipe screen in the
intake termination because the air intake may freeze shut.
For proper operation, the vent and air intake pipe must be
installed in the same pressure zone. Therefore, in horizontal
venting applications they must be on the same side of the
house within the parameters as shown.
NOTE: The 18 in. dimension shown in "Direct Vent
Counterflow - Horizontal Venting" is the minimum
recommended height for extremely cold areas. In these
areas, moisture in the flue gases may condense and freeze on
the air intake if this height is reduced. In milder climates, this
may be reduced to a minimum of 6 in. Height may be
increased as needed provided total length is not exceeded.
Direct Vent Counterflow - Horizontal Venting
Run Ptich = 1/4"
Per Foot Min.
1
2
3
Overhead View
5
6
1. PVC collars
2. Flue pipe
3. Condensate collar
4. Optional piece
12
4
5
18"
6
6"
Height to Provide
12" Clearance to
Max. Snow Level.
7
4
3" Min. - 48" Max.
5. Flue pipe screen
(inside flue pipe)
6. Air intake pipe
7. Wall
Direct Vent Counterflow- Vertical Venting
1
10 Ft.
Min.
Run Pitch = 1/4"
Per Foot Min.
2
3
4
1. Flue pipe screen
(inside flue pipe)
2. Flue pipe
3. PVC collars
4. Condensate collar
The 45,000 and 67,000 BTU per hour models contain an inlet
air assembly that uses two 22.5° elbows that attach
separately from the straight inlet pipe, as shown. This allows
the inlet pipe assembly to be removed if needed for service.
Inlet Air Assembly- 45,000 & 67,000 BTU/HR Units
1
2
3
1. Straight inlet pipe
2. 22.5° Elbows
6.5" Min. - 24" Max.
2 Ft.
Min.
5. Storm collars
6. Flashing
7. Air intake pipe
3. Burner box
5
6
7

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