Installation and Best Layout Practices
DUCT (HIGH STATIC) INDOOR UNITS
Checking the Drainage System
1. Remove the air filter.
2. Check the drainage.
• Spray water on the evaporator.
• Verify that water flows through the indoor unit drain hose without leaking.
Figure 142:Checking the Drainage System.
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 unit uses a drain pump to remove condensate. The pump must be tested before the
system operates.
• Connect (field supplied) flexible drain hose to the field-installed 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.
Figure 143: Insulating the Piping.
Refrigerant Piping Insulation
Field-installed vapor and liquid refrigerant piping lines must be prop-
erly and completely covered in insulation (up to the indoor unit piping
connections). Any exposed piping may generate condensate or will
cause burns if touched. Insulation for this field-installed refrigerant
piping must have a minimum heat resistance of 248°F.
Drain Piping Insulation
Drain piping must have insulation a minimum of 7/32 inches thick.
Figure 141:Checking the drain pump.
Liquid Piping
Connection
Insulation for Refrigerant Piping
(Field-Supplied)
Vapor Piping Connection
Insulation
(Field-Supplied)
Clamp for Insulation
(Field-Supplied)
Ensure no gaps are present.
Overlap the Insulation at the
Connection
Insulation for Refrigerant Piping
(Field-Supplied)
Insulation for Field-Installed Piping
(Field-Supplied)
Insulating the Refrigerant and Drain Piping
Ensure all piping is insulated. Exposed piping can cause burns if touched.
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.
106 | DUCT (HIGH STATIC)
Multi F and Multi F MAX Indoor Unit Engineering Manual
(62 pages)
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