LG MULTI F Engineering Manual page 82

STANDARD WALL-MOUNTED INDOOR UNITS
Installation and Best Layout Practices
Connecting the Indoor Unit Piping to the Field-Installed Piping
1. Center align the indoor unit piping (refrigerant and drain) and the field-installed
piping, then hand tighten the flare nut.
2. Tighten the flare nut with a torque wrench.
3. Attach the drain tube piping to the indoor unit drain hose as shown.
If the drain hose is routed inside
a room, add insulation to prevent
condensation from forming.
Insulating the Refrigerant and Drain Piping
Refrigerant Piping Insulation
Field-installed vapor and liquid refrigerant piping lines must be properly and completely covered in
insulation (up to the indoor unit piping connections). Any exposed piping may generate conden-
sate 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.
Installing the Insulation
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 Slope
Drain hose should point
down so water can flow
away easily.
Figure 103:Drain Piping Slope.
Slope Down
82 | STD. WALL-MOUNTED
Figure 101:Extending the Drain Hose.
Drain extension
Narrow tape
Adhesive
Checking the
Drainage System
1. Pour water on the indoor
unit evaporator.
2. Ensure the water flows
through and out of the
hose and away from
the indoor unit without
leaking.
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 100:Indoor Unit to Field-Installed Piping Connection.
Indoor unit piping
Indoor unit
Torque
drain hose
wrench
Figure 104:Checking the Drainage
System.
Drain hose
connection
Check for
leaks
Drain pan
Drain
hose
Check for
leaks
F
MULTI
F
MULTI
Flare nut Field-installed
piping
Spanner
Flare nut
Field-installed
piping
Figure 102:Insulating the Piping.
Bands
Insulation
1.
Field-supplied
piping
Wide tape
Wrap with tape
2.
Piping
Narrow tape
Wrap with tape
3.
Piping
Wide tape
Drain hose
MAX
Indoor unit
piping