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Installation Manual
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.
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Drain Pipe Insulation
Drain piping must have insulation a minimum of 7/32 inches thick.
1. Overlap the insulation at the connection of the field-installed piping and the indoor unit piping. Tape together so that no gaps exist.
2. Secure insulation to the rear piping housing section with vinyl tape.
3. Bundle the piping and drain hose with tape where they meet at the back of the indoor unit frame. Position the drain hose at the bottom of
the bundle (positioning the drain hose at the top of the bundle may cause the drain pan to overflow inside the indoor unit).
Drain Piping
Checking the Drainage System
Drain pan
Drain
hose
Drain hose
connection
Check for
leaks
Check for
leaks
Figure 46: Flexible Drain Hose
Connection.
Drain Slope
Drain hose should point down so water can flow away easily. 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.
1. Pour water on the indoor unit evaporator.
Do not use any
other liquid to test the drain.
2. Ensure the water flows through and out of the hose and away
from the indoor unit without leaking.
PIPING CONNECTIONS
Drain Piping
Indoor unit
Gradient of at least 1/50~1/100
Figure 47: Indoor Unit with Gravity Drain.
Clamp the Flexible Drain Hose Connection
The standard wall-mounted indoor units have a factory-provided flexible pipe (13/16” O.D./ 5/8” I.D.) to drain condensate water. The flexible
pipe connects to field-provided drain pipe. Use materials that comply with local codes for drain pipe and insulation.
1. Install the flexible drain pipe as straight as possible; sharp angles may cause the pipe to deteriorate and may crack over time.
2. Connect the flexible drain pipe with a round clamp. If the flexible drain pipe is not installed properly, water will leak from the connection.
3. Do not include a reverse slope in the drain connection.
Figure 48: Drain Piping Gradient Recommendation.
Metal clamp
Drain pan
Insulation
Flexible drain hose
Insulation
Figure 49: Checking the Drainage System.
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