21
note: I
n
VertIcal
InstallatIons
,
aIr
conDItIonIng
coIl
conDensate
MaY
DraIn
Into
tHe
furnace
traP
as
long
as
tHere
Is
a
traP
Between
tHe
coIl
anD
tHe
furnace
traP
anD
tHe
DraIn
PIPe
Is
not
terMInatIng
Below
tHe
water
leVel
of
tHe
furnace
traP
.
g
eneral
D
raIn
I
nforMatIon
All furnace models come with a factory installed drain trap.
For vertical installations, the trap will remain in the factory
position except for a counterflow when the installer desires
the drain to exit the right side. All furnace models installed
horizontally require the trap to be relocated. Many drain
hoses have a built–in grommet which will provide a cabinet
seal when installed. See instructions below for your model
and installation position.
note: B
otH
sIDes
of
tHe
DraIn
traP
Must
Be
PrIMeD
PrIor
to
InItIal
furnace
start
uP
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.
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 23).
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.
#3
#1
#2
#4
#5
#6
#7
#8
#9
#10
#11
100 Degree
Elbow
Coupling
f
Igure
22
note: D
raIn
coMPonenets
sHown
for
InforMatIon
PurPoses
onlY
.
CONDENSATE DRAIN LINES & DRAIN
TRAP
A condensing gas furnace achieves its high level
of efficiency by extracting heat from the products of
combustion to the point where condensation takes place.
The condensate must be collected in the furnace drain trap
and routed to an appropriate drain location in compliance
with local and national codes.
Follow the bullets listed below when installing the drain
system. Refer to the following sections for specific details
concerning furnace drain trap installation and drain hose
hook ups.
• The drain trap supplied with the furnace must be
used.
• The drain trap must be primed at time of installation.
• The drain line between furnace and drain location
must meet local and nation codes.
• The drain line between furnace and drain location
must maintain a 1/4 inch per foot downward slope
toward the drain.
•
Do not trap the drain line in any other location than at
the drain trap supplied with the furnace.
• If the drain line is routed through an area which may
see temperatures near or below freezing, precautions
must be taken to prevent condensate from freezing
within the drain line.
• If an air conditioning coil is installed with the furnace,
a common drain may be used. An open tee must
be installed in the drain line, near the cooling coil, to
relieve positive air pressure from the coil’s plenum.
This is necessary to prohibit any interference with the
function of the furnace’s drain trap.
