# 47860A005
Page 11
Horizontal Direct Vent Installation
An inlet air restrictor plate (see Figure 2 on page 5) is supplied
with this furnace and can be found in the plastic bag containing
these Installation Instructions and the User’s Information
Manual.
This restrictor plate is to be used only in non-direct
vent applications.
See the non-direct venting sections on this
page and page 13 for more information on installing the
restrictor plate in non-direct vent applications.
The flue pipe screen (see Figure 2 on page 5) should be
installed at the termination of the flue pipe and is designed
to keep objects out of the flue pipe. An additional screen
should
not
be placed in the intake termination. If a screen is
installed, the air intake may freeze shut.
The 18" dimension shown in Figure 11 on page 12 is the
minimum recommended height for extremely cold areas. In
Upflow Non-Direct Vent Installation
An inlet air restrictor plate (see Figure 2 on page 5) is
supplied with this furnace and can be found in the plastic
bag containing these Installation Instructions and the
User’s Information Manual. This restrictor plate is to be
used only in non-direct vent applications. Place the
restrictor plate into the inlet collar, insert 3" section of PVC
pipe (field supplied), then attach a 90° elbow (field sup-
plied) to the PVC pipe in all non-direct vent installations
(see Figures 9 and 10).
Two inlet air restrictor plates are supplied with each
furnace – a 2" plate and a 3" plate. Use the proper
restrictor plate for the furnace model.
The flue pipe screen (see Figure 2 on page 5) should be
installed at the termination of the flue pipe and is designed
to keep objects out of the flue pipe.
For horizontal venting, refer to Figure 9. For vertical
venting, refer to Figure 10. The vent pipe on horizontal
runs must slope upward, away from the furnace, at a
minimum pitch of 1/4" per foot of run, to prevent accumu-
lation of condensate.
Prime the trap system by slowly pouring 1 cup of water
down the vent pipe. On initial start-up of the unit, some of
the water used to prime the trap system may run down into
the combustion blower and cause noise.
Figure 9
Upflow Non-Direct Vent
Horizontal Venting
Upflow Non-Direct Vent
Vertical Venting
Figure 10
