Condensate Drain Piping - LG MULTI F Engineering Manual

F
MULTI
F
MULTI MAX

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 185 to page 190 for information on outdoor unit placement and condensate drainage.
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.
Table 130:Indoor Unit Drain Piping Specifications.
Indoor Unit
Art Cool Wall-Mounted
Art Cool Gallery
Standard Wall-Mounted
Ceiling-Concealed Ducted
(Low Static and High Static)
Four-Way Ceiling Cassette
Vertical-Horizontal Air Handling Unit
Figure 291:Diagram of an Indoor Unit with a Gravity Drain.
Drain pan
Insulation
Ensure the indoor unit, refrigerant piping, power wiring / communication cables, and drain piping is properly supported with anchor bolts and
clamp hangers positioned at 3.3 to 4.9 foot intervals.
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.
INSTALLATION & LAYOUT BEST PRACTICES
Drain Type
Gravity
Gravity
Gravity
27-1/2 in. Lift Drain Pump,
Factory Installed
27-1/2 in. Lift Drain Pump,
Factory Installed
Gravity
Metal clamp
Flexible drain hose
Insulation
Figure 293:Flexible Drain Hose
Connection.
Clamp the Flexible Drain Hose Connection
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. "LG" is a registered trademark of LG Corp.
Condensate Drain Piping
Drain Pipe Diameter (OD / ID, in.)
13/16 / 5/8
13/16 / 5/8
13/16 / 5/8
Ø1-1/4 / Ø1
Ø1-1/4 / Ø1
Ø3/4 / —
Figure 292: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.
Figure 294:Drain Piping Gradient Recommendation.
Indoor unit
Drain Amount
(gal. / min. at 0.033 ft. height)
—
—
—
0.105
0.105
—
≤11-13/16 in.
PVC elbow
PVC
1/50~1/100 slope
PVC
Flexible hose
Drain pump
Gradient of at least 1/50~1/100
DESIGN & PRACTICES | 209