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INSTALLATION & LAYOUT BEST PRACTICES
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.
Condensate Drain 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 —
Low Wall Console 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. (9,12MBh) or
31-1/2 in (18MBh) Lift Drain Pump,
Factory Installed
Ø1-1/4 / Ø1 0.105
Vertical-Horizontal Air Handling Unit Gravity Ø3/4 / — —
Table 129:Indoor Unit Drain Piping Specications.
Flexible hose
Drain pump
PVC elbow
PVC
PVC
1/50~1/100 slope
≤Max. 27-1/2 in. (Ducted and
9/12MBh Cassette)
≤Max. 31-1/2 in. (18MBh Cassette)
≤11-13/16 in.
Metal clamp
Drain pan
Insulation
Flexible drain hose
Insulation
Figure 280:Diagram of an Indoor Unit with a Gravity Drain. Figure 281:Diagram of an Indoor Unit with a Drain Pump.
Due to our policy of continuous product innovation, some specications may change without notication.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
DESIGN & PRACTICES | 225
Refrigerant Piping Design and Best Practices
MULTI
F
MAX
MULTI
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