Page 4
# 44876D006
Unit
Drain Connection
Positive Liquid Seal Required
3.00" Min.
1.00" Min.
12.00"
Max.
Typical Condensate Drain Connection
Figure 1
Condensate Drain Connection
Do not operate unit without a drain trap. The conden-
sate drain is on the negative pressure side of the
blower; therefore, air being pulled through the con-
densate line will prevent positive drainage without a
proper trap.
To avoid drain pan overflow, the web must be re-
moved from inside any threaded drain pan hole to
which a drain line is to be connected. Use care when
removing the web so as to not damage the coil.
On horizontal units, the primary drain connection is flush
with the bottom of the inside of pan. Auxiliary connection
is raised above the bottom of the inside of the pan. Plastic
web covering 3/4" auxiliary connection must be broken out
if used. Do not get primary and auxiliary connections
interchanged.
When making drain fitting connections to the drain pan,
hand tighten only. Overtightening the fittings can split
connections on the drain pan.
The unit is provided with 3/4" FPT condensate drain
connections.
•
Connect the drain lines to the appropriate drain pan
fittings.
•
Secondary drain connections should be connected to
a separate drainage system.
•
Install a trap in the drain line below the bottom of the
drain pan and pitch the drain lines down from the coil
at least 1/4" per foot of run. Horizontal runs over 15'
long must also have an anti-siphon air vent (stand
pipe), installed ahead of the horizontal run. An ex-
tremely long horizontal run may require an oversized
drain line to eliminate air trapping.
•
Route to the outside or to an appropriate drain. Check
local codes before connecting drain line to an existing
drainage system.
•
Insulate drain lines where sweating could cause water
damage.
•
The removal of cabinet knockouts required for drain
connections can be made much easier with the indoor
coil assembly removed from the cabinet.
•
Install drain lines so they do not block service access
to front of unit. A 24" clearance is required for filter,
coil, or blower removal and service access.
•
Make sure unit is level or pitched slightly toward
primary drain connection so that drain pan will empty
completely without water standing in pan.
•
Install a 2" trap in the primary drain line as close to the
unit as practical. Make sure that the top of the trap is
below connection to the drain pan to allow complete
drainage of pan.
•
Auxiliary drain (if used) should be run to a place where
it would be noticeable if it becomes operational. Occu-
pant should be warned that a problem exists if water
should begin running from the auxiliary drain line.
•
Test condensate drain pan and drain line after installa-
tion is complete. Pour several quarts of water into
drain pan, enough to fill drain trap and line. Check to
make sure drain pan is draining completely, no leaks
are found in drain line fittings, and water is draining
from the termination of the primary drain line.
A field fabricated auxiliary drain pan, with a
drain pipe to the outside of the building, is
required
in all installations over a finished living
space or in any area that may be damaged by
overflow from the main drain pan. In some
localities, local codes may require an auxiliary
drain pan for
any
horizontal installation.
CAUTION
