Installing Drain System - LG MULTI F Installation Manual

GENERAL INSTALLATION GUIDELINES

Installing Drain System

Installing the Drain System
• The unit uses a drain pump with a height of up to 27-9/16 inches
to remove condensate from the indoor unit to the drainage
system. To ensure proper drainage, the flexible drain piping and
any field-supplied drain piping should be installed below the
maximum height.
• Field-supplied drain piping must have downward gradient of at
least 1/50 to 1/100; to prevent reverse flow, slope should not be
straight up and down.
• Do not damage the drain port on the indoor unit when con-
necting the flexible drain hose or field-supplied drain piping.
• Drain piping specifications:
- Indoor Unit Drain Connection (Flexible Drain Hose): 1-1/4 inch
outside diameter.
Note:
The supplied flexible drain hose should not be installed with a sharp
curve or twist. A curved or twisted hose may become damaged due to
vibration and / or leak.
- Field-Supplied Drain Piping: Polyvinyl chloride piping with 1-inch
inside diameter and pipe fittings.
Note:
Condensate can be drained either directly outside or to a common drain system. For more information regarding the common drain system, see the
Multi F / Multi F MAX Outdoor Unit Engineering Manual
If the field drain piping and / or the common drain sys-
tem is long, it is recommended that clamp hangers be
installed for support.
Table 12: Recommended Drain Piping Support Intervals.
Piping Dia. Ø3/4" ~
(Inch) 1-1/2"
Maximum
Interval <3.3
(feet)
Checking the Drain Pump
The drain pump must be tested before the system operates.
• Connect flexible drain hose to the field-supplied drain piping; leave it as is until the
test is complete.
• Pour water into the flexible drain hose and check for leaks.
• After power wiring installation is complete, operate the drain pump to see if it sounds
and functions properly.
• After the test is complete, connect the flexible drain hose to the indoor unit drain port.
22
Figure 14: Correct (Another View) and Incorrect
Metal Clamp
Ø1-1/2" Ø2-1/2"
~ 2" ~ 5"
Maintenance
<3.9 <4.9
Drain Port
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.
Figure 12: Ceiling Cassette Indoor Unit Drain System.
Drain Slopes.
Indoor Unit
Drain Pump
MULTI
MULTI
≤11-13/16 inches
PVC Elbow
(Field
Supplied)
PVC Piping
(Field Supplied)
Flexible Drain Hose
(Factory Supplied)
Drain pump
Figure 13: Drain Slope.
1/50~
1/100
<27-9/16 inches
Figure 15: Flexible Drain Hose
Connection.
Routing Up
Not Permitted
Clamp the Flexible Drain Hose Connection
Figure 16: Checking the Drain Pump.
Flexible drain hose
(accessory)
Pour Water
Drain
Port
Drain Hose Connection
Use the clip (accessory)
Drain Pan
F
F
MAX
Common Drain Pipe
Field-Installed
Drain Piping
Glue the Joint