19
F
IELD
S
UPPLIED
D
RAIN
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, with an open tee
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.
U
PFLOW
M
ODEL
I
NSTALLED
V
ERTICALLY
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 22. Any unused cabinet opening must be
sealed. Do not allow drain hose to sag or trap water.
Side Cut-Out
12”
3”
Right side shown.
Acceptable
area for
drain hole.
Figure 22
D
RAIN
E
XITING
R
IGHT
S
IDE
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 22).
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.
D
RAIN
E
XITING
L
EFT
S
IDE
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 23).
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.
Installer selects right or left side drain
and installs this hose accordingly.
Hose #1
Hose #2
45 degree
barb-pipe
adapter
45 degree
barb-pipe
adapter
Figure 23
U
PFLOW
M
ODEL
I
NSTALLED
H
ORIZONTALLY
WITH
R
IGHT
S
IDE
D
OWN
Minimum 5 ½" clearance is required for the drain trap
beneath the furnace.
1. Remove the clamps from both ends of the drain 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.
5 (Draining the Vent Elbow) Locate hose #2 (factory
installed) and cut 1" away from the 45 degree bend,
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.
6. (Draining the Collector Box) Install the non-grommet
end of hose #11 from outside the cabinet in the bottom
drain hole. Install on collector box and secure with a
silver clamp.
