Engineering Manual

INSTALLATION & LAYOUT BEST PRACTICES
Condensate Drain Piping
Outdoor Units
Outdoor unit requires condensate drain piping. Condensate drain pipe is constructed with materials approved by local code. See “Placement
Considerations” on page 176 to page 185 for information on outdoor unit placement and condensate drainage.
Condensate Drain Piping
Indoor Units
All indoor units generate water during cooling operation, therefore, how to properly handle this condensation must be considered. Some
indoor units include factory-installed drain pumps; others apply the gravity drain method.
Depending on the location of the indoor unit, condensation can be drained directly to the outside of the building, or a common indoor unit
drainage piping system can be installed, both incorporating PVC piping.
Indoor Unit Drain Type Drain Pipe Diameter (OD / ID, in.)
Drain Amount
(gal. / min. at 0.033 ft. height)
Art Cool Wall-Mounted Gravity 13/16 / 5/8 —
Art Cool Gallery Gravity 13/16 / 5/8 —
Standard Wall-Mounted Gravity 13/16 / 5/8 —
Ceiling-Concealed Ducted
(Low Static and High Static)
27-1/2 in. Lift Drain Pump,
Factory Installed
Ø1-1/4 / Ø1 0.105
Four-Way Ceiling Cassette
27-1/2 in. Lift Drain Pump,
Factory Installed
Ø1-1/4 / Ø1 0.105
Vertical-Horizontal Air Handling Unit Gravity Ø3/4 / — —
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Flexible hose
Drain pump
PVC elbow
PVC
PVC
1/50~1/100 slope
≤Max. 27-1/2 in.
≤11-13/16 in.
Metal clamp
Drain pan
Insulation
Flexible drain hose
Insulation
Figure 285: Diagram of an Indoor Unit with a Gravity Drain. Figure 286: Diagram of an Indoor Unit with a Drain Pump.
Drainage Gradient
The gradient for drain piping should be at least 1/50 to 1/100.
Ensure any holes through ceilings, walls, etc., are large enough to
accommodate both the drain piping and any insulation.
Indoor unit
Gradient of at least 1/50~1/100
Figure 287: Flexible Drain Hose
Connection.
Clamp the Flexible Drain Hose Connection
Figure 288: Drain Piping Gradient Recommendation.
Flexible Drain Hose
Some indoor units include a
factory-provided flexible drain
pipe for installation.
• Install the flexible drain pipe
as straight as possible; sharp
angles may cause the pipe
to deteriorate and may crack
over time.
• Connect the flexible drain pipe
with a round clamp. If the flex-
ible drain pipe is not installed
properly, water will leak from
the connection.
• Do not include a reverse slope
in the drain connection.
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DESIGN & PRACTICES | 205
Refrigerant Piping Design and Best Practices
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