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Field Supplied Drain
Drain the furnace and air conditioning coil if applicable,
in compliance with code requirements. In horizontal or
counterflow 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.
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 24).
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.
45 degree
barb-pipe
adapter
Installer selects right or left side drain
and installs this hose accordingly.
Figure 24
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 45 degree 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 24).
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.
Upflow Model Installed Horizontally with Right
Side Down
Minimum 5 1/2" clearance is required for the drain trap
beneath the furnace.
Hose #1
1. Remove the clamps from both ends of the drain
Hose #2
hoses.
2. Remove the two screws holding the drain trap to the
blower deck.
3. Remove the trap and two hoses from the blower
deck
4. Remove the two plugs from the right side of the
cabinet and install them in the blower deck.
45 degree
5. (Draining the Vent Elbow ) Locate hose #2 (factory
barb-pipe
installed) and cut 1" away from the 45 degree bend,
adapter
discard the 45 degree section. Insert hose #2 from
outside the cabinet through the cabinet drain hole
nearest the top, secure it to the barbed fitting in the
elbow with a red clamp.
21
Hose #2
Hose #11
Figure 25
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