17
#
3
#1
#2
#4
#5
#6
#7
#8
#9
#10
#11
100 Degree
Elbow
Coupling
Figure 22
NOTE: Drain components shown for information purposes only.
General Drain Information
All furnace models come with a factory installed drain trap.
For vertical installations, the trap will remain in the factory
position. 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: Both sides of the drain trap must be primed prior
to initial furnace start up
Field Supplied Drain
Drain the furnace and air conditioning coil if applicable, in
compliance with code requirements. In horizontal installa
-
tions, 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”
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.
NOTE:
In vertical installations, air conditioning coil conden
-
sate 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.
