Trane GAF2A0A36M31EC Installer's Manual page 22

STEP 4 - Install a clean-out tee in the primary drain
line for future maintenance. It is recommended that
you install a cap on the top of the tee.
STEP 5 - Insulate the primary drain line to prevent
sweating where dew point temperatures may be
met. (Optional depending on climate and application
needs.)
Provide a means of drainage to prevent winter freeze-
up of condensate line. (Optional depending on climate
and application needs.)
STEP 6 - Support the condensate piping outside the
unit per local codes for proper drainage and to prevent
sagging.
Allow 1/4" of downward slope for each foot of pipe.
22
1.5" minimum
clearance is
recommended
from cabinet to
inside edge of
tubing
Condensate
Piping
Supports
Cap
1.5" min.
Tee
Insulation