Multi F Ceiling Cassette Installation Manual

22
Multi F Ceiling Cassette Indoor Unit
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.
MA
X
MUL
TI
F
MUL
TI
F
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 exible drain piping and
any eld-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 ow, slope should not be
straight up and down.
• Do not damage the drain port on the indoor unit when con-
necting the exible drain hose or eld-supplied drain piping.
• Drain piping specications:
- Indoor Unit Drain Connection (Flexible Drain Hose): 1-1/4 inch
outside diameter.
The supplied exible 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.
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
Pour Water
Drain Pump
Drain Pan
Flexible drain hose
(accessory)
Field-Installed
Drain Piping
Glue the Joint
Drain
Port
Drain Hose Connection
Use the clip (accessory)
Checking the Drain Pump
The drain pump must be tested before the system operates.
• Connect exible drain hose to the eld-supplied drain piping; leave it as is until the
test is complete.
• Pour water into the exible 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 exible drain hose to the indoor unit drain port.
Clamp the Flexible Drain Hose Connection
Maintenance
Drain Port
Routing Up
Not Permitted
Metal Clamp
Indoor Unit
Piping Dia.
(Inch)
Ø3/4" ~
1-1/2"
Ø1-1/2"
~ 2"
Ø2-1/2"
~ 5"
Maximum
Interval
(feet)
<3.3 <3.9 <4.9
Figure 14: Correct (Another View) and Incorrect
Drain Slopes.
Figure 15: Flexible Drain Hose
Connection.
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.
GENERAL INSTALLATION GUIDELINES
Installing Drain System
Figure 16: Checking the Drain Pump.
1/50~
1/100
<27-9/16 inches
Figure 12: Ceiling Cassette Indoor Unit Drain System.
Flexible Drain Hose
(Factory Supplied)
Drain pump
PVC Elbow
(Field
Supplied)
PVC Piping
(Field Supplied)
Maximum
27-9/16 inches
≤11-13/16 inches
Common Drain Pipe
Figure 13: Drain Slope.
Note:
Note: