LG MULTI F Engineering Manual page 123

F
MULTI
F
MULTI MAX
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.
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.
Insulating the Refrigerant and Drain 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.
DUCT (HIGH STATIC) INDOOR UNITS
Due to our policy of continuous product innovation, some specifications may change without notification.
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Installation and Best Layout Practices
Figure 169:Checking the drain pump.
Pour Water
Drain Pump
Drain Pan
Figure 170:Checking the Drainage System.
Figure 171: Insulating the Piping.
Liquid Piping
Connection
Vapor Piping Connection
Insulation for Refrigerant Piping
(Field-Supplied) Insulation for Field-Installed Piping
Ensure no gaps are present.
Flexible drain hose
(accessory)
Field-Installed
Drain Piping
Drain
Port Glue the Joint
Drain Hose Connection
Use the clip (accessory)
Insulation for Refrigerant Piping
(Field-Supplied)
Clamp for Insulation
(Field-Supplied)
Insulation
(Field-Supplied)
(Field-Supplied)
Overlap the Insulation at the
Connection
DUCT (HIGH STATIC) | 123