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Whirlpool WFCU Installation Instructions Manual page 13

90+ gas furnace
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Non-Direct Vent Installation- Counterflow Models
Refer to appropriate tables for proper pipe size, vent length
and the number of elbows allowed.
Refer to the "Materials" section for the proper venting
material.
An inlet air restrictor plate found in the plastic bag containing
these Installation Instructions and the Use and Care Guide
must be installed in all non-direct vent installations. See the
"Inlet Air Restrictor Plate" section. Attach a 90° elbow (not
supplied) to the inlet coupler and install the inlet air restrictor
plate inside the elbow.
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.
Non-Direct Vent Counterflow - Horizontal Venting
Run Ptich = 1/4"
Per Foot Min.
1
2
3
4
1. Inlet coupler
4. Condensate collar
2. PVC collars
5. Flue pipe screen (inside flue pipe)
3. Flue pipe
6. Inlet air restrictor plate
6"
Height to Provide
12" Clearance to
Max. Snow Level.
(inside intake pipe or elbow)
Non-Direct Vent Counterflow - Vertical Venting
5
1
6
2
3
1. Flue pipe
2. PVC collars
3. Condensate collar
4. Flue pipe screen
(inside flue pipe)
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. Straight inlet pipe
2. 22.5° Elbows
10 Ft.
Min.
2 Ft.
Min.
Run Pitch = 1/4"
Per Foot Min.
5. Storm collar
6. Flashing
7. Inlet air restrictor plate
(inside intake pipe or elbow)
8. Air intake pipe
1
2
3
3. Burner box
4
5
6
7
8
13

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