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18
PIPING INSTALLATION
Indoor Condensate Drain Piping
Observe all local sanitary codes when installing condensate drains.
WARNING
It is recommended to install the condensate drain system with hard polyvinyl chloride (PVC) pipe
and matching connectors. Use piping of the same diameter as the unit connection, or of the same
diameter of the raising section.
The Ceiling Cassette drainage port diameter is 1-in (25 mm) OD.
Pitch the condensate drain pipe at a gradual 2.5% pitch (Example: ¼-in drop over a 10-in length)
without obstructions. Use pipe hanger/brackets to support the condensate drain pipe from dropping.
If a gradual pitch from the drainage port is not obtainable, the Ceiling Cassette contains an internal
condensate drain pump with limited head or lift. The condensate drain pipe may have a vertical
height of 39-in. maximum above the unit drainage port within the first 12-in as long as the remaining
condensate drain pipe gradually descends from that point and is aligned with drainage port.
NOTE: Insulate condensate hose and/or pipes to prevent sweating which may cause
water stains or wall damage.
Ceiling
Hangers
Wall
Ceiling
C
Hangers
Wall
39-in
max
12-in
max
Sealed
Drain
pipe
Clamps
Completing Condensate Drainage Piping
•
Include the exterior section of condensate hose in the
pipe/wire bundle.
•
Fasten the refrigerant and condensate pipe assembly to
the exterior wall for support.
•
The drain pipe should terminate 6 inches above grade.
Use an auxiliary condensate pump with float valve for vertical height greater than 39-in. above the unit
drainage port. A float valve is recommended to shut off the system if the auxiliary pump fails.
Typical Drainage System Vertical Lift Drainage System
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