# 47904K005
Page 14
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.
Horizontal Non-Direct Vent Installation
An inlet air restrictor plate (see Figure 2 on page 6) is
supplied with this furnace and can be found in the plastic
bag containing these Installation Instructions. 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 supplied) to the PVC pipe in all non-direct
vent installations (see Figures 12 and 13).
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 6) 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 13. For vertical venting,
refer to Figure 14. 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 accumulation 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.
Airflow Right to Left
Figure 14
Horizontal Non-Direct Vent –
Vertical Venting
Airflow Left to Right
Inlet Air Restrictor Plate
(inside inlet coupler)
Vent
Pipe
Height to
provide 12
clearance
to average
snow level
"
Drain Tee
(supplied)
3 Long Piece of 2 Diameter Pipe
(supplied)
"
"
See table for
vent length
and number
of elbows
allowed
Airflow Left to Right
Airflow Right to Left
3 Long Piece of
2 Diameter Pipe
(supplied)
"
"
6
"
Drain Tee
(supplied with unit)
Inlet Air Restrictor Plate
(inside inlet coupler)
Vent
Pipe
Height to
provide 12
clearance
to average
snow level
"
Figure 13
Horizontal Non-Direct Vent –
Horizontal Venting
