Gree MULTI21 CAS12HP230V1AC Technical Product Manual - Page 14
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CONDENSATE DRAIN DESIGNS
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.
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 Ceiling Cassette 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 off the system if the auxiliary pump fails.
Ceiling
Ceiling
13
Hangers
Hanger
Ceiling
Hangers
11-in
max
12-in
max