Use and Care Manual

67
CONDENSATE DRAIN DESIGNS
Gravity Drainage Systems
with P-trap & Vent
Pitch the condensate drain pipes at a gradual
2.5% pitch (Example: 1/4-in. drop over a 10-in.
length) without obstructions. Use pipe hanger/
brackets to support the condensate drain pipe
from drooping. Insulate all pipes to prevent
sweating and water damage.
Multiple Units with Common Drain
The following is the recommended condensate
drainage system for multiple units that share a
common drain line. Connecting multiple units
to one trap allows air to be pulled through one
or more of the units, bypassing the trap. An
alternate method is having individual drains
and traps for each unit.
Vertical Lift Drainage System
If a gradual pitch from the drainage port is not
obtainable, the Concealed Duct contains an
internal condensate pump with limited head or
lift. The condensate drain pipe may have a
vertical height of 11-in. (280 mm) maximum
above the unit drainage port within the first
12-in. (300 mm) as long as the remaining
condensate drain pipe gradually descends
from that point and aligns with drainage port.
Use an auxiliary condensate pump with float
valve for vertical height greater than 11-in.
(280 mm) above the unit drainage port. A float
valve is recommended to shut o the system
if the auxiliary pump fails.
It’s recommended to build the condensate drain system with hard polyvinyl chloride (PVC) pipe and matching
connectors. Use pipe with either the same diameter or larger than the unit drainage port.
Ceiling
Ceiling
Ceiling
Ceiling
Hangers
Hangers
Hangers
Wall
Wall
Wall
Wall
11-in
max
12-in
max