Whirlpool WFCU Installation Instructions Manual page 13

Direct Vent Installation—Upflow Installations
Refer to the appropriate vent table for proper pipe size, vent
length and the number of elbows allowed, and air intake
length and the number of elbows allowed.
Refer to "Materials" in "Plan Vent System" 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" in "Venting Requirements") supplied with
this furnace is to be used only in nondirect vent applications.
The flue pipe screen, designed to keep objects out of the flue
pipe (see "Flue Pipe Screen" in "Venting Requirements"),
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.
Direct Vent—Upflow (Horizontal Venting)
A
L
K
Overhead View
D
F
¹⁄₄
A. Run pitch = " (6.4 mm) per foot
minimum
B. Optional piece
C. Flue pipe screen (inside flue pipe)
D. Flue pipe
E. 18" (45.7 cm)
F. Air intake pipe
G. 6" (15.2 cm)
B
C
D
E
F
G
H
I
I
B
J
H. 12" (30.5 cm) minimum
clearance. Adjust height to
expected snow level based on
local conditions.
I. Wall
J. 3" (7.6 cm) minimum to 48"
(121.9 cm) maximum
K. Condensate collar
L. Air intake pipe
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" (45.7 cm) dimension shown below 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" (15.2 cm).
Height may be increased as needed provided total length of
pipe to furnace is not exceeded.
Direct Vent—Upflow (Vertical Venting)
H
G
A. 6" (15.2 cm) minimum clearance. Adjust height
to expected snow level based on local
conditions.
¹⁄₂
B. 6 " (16.5 cm) minimum to 24" (61 cm) maximum
C. Flue pipe screen (inside flue pipe)
D. Storm collars
E. Flashing
B
A
I
F. Air intake pipe
G. Condensate collar
H. Flue pipe
I. Run pitch =
(6.4 mm) per foot
minimum
C
D
E
F
¹⁄₄
"
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