18
Figure 24
Field Supplied Drain
Drain the furnace and air conditioning coil if applicable,
in compliance with code requirements. In horizontal
installations, a field installed rubber coupling will allow
the drain trap to be removed for cleaning. The drain trap
must be primed before initial furnace start up. When
an air conditioning coil drain is connected to the field
supplied furnace drain, it must be vented. An open tee
must be installed at a height no higher than the bottom
of the furnace collector box to prevent air conditioning
condensate from backing up into the furnace, if the
common drain was blocked.
Upflow Model Installed Vertically
The trap and factory installed hoses remain as shipped.
The furnace drain may exit either the right or left side of the
furnace cabinet. Both sides of the cabinet have two .875”
diameter holes which can be used interchangeably for
drain and low voltage wiring purposes. If a higher drain exit
is needed, a .875” diameter hole may be added in the area
shown in Figure 24. Any unused cabinet opening must be
sealed. Do not allow drain hose to sag or trap water.
Hose #1
Hose #2
45
º
barb-pipe
adapter
45
barb-pipe
adapter
º
Installer selects right or left side drain
and installs this hose accordingly
Figure 25
Drain Exiting Right Side
1. Locate and Install the 45º pipe/hose drain coupling
from the outside of the cabinet (barbed end goes
in the cabinet) through hole in the right side of the
cabinet and secure with two field supplied #8 self-
tapping screws (See Figure 25).
2. Locate the long drain hose #3 and cut at line “A”.
3. Install large end of hose #3 to trap outlet and secure
with 1.25” clamp.
4. Install smaller end of hose #3 on 45º elbow and
secure with 1” clamp.
5.
Refer to Field Supplied Drain section for instructions
on field supplied/installed drain on outlet of furnace
trap.
Drain Exiting Left Side
1. Install the 45º pipe/hose drain coupling from the
outside of the cabinet (barbed end goes in the
cabinet) through the hole in the left side of the cabinet
and secure with two field supplied #8 self-tapping
screws (see Figure 25).
2. Locate the long drain hose #3 and cut at “B” line for a
17.5” cabinet; cut at line “C” for a 21” cabinet; do not
cut for a “D” width cabinet.
3. Install large end of hose #3 to trap outlet and secure
with 1.25” clamp.
4. Install smaller end of hose #3 on 45º elbow and
secure with 1” clamp.
5.
Refer to Field Supplied Drain section for instructions
on field supplied/installed drain on outlet of furnace
trap.
