LG MULTI F Installation Manual page 49

F
MULTI
F
MULTI MAX
Installing Field Piping to the Outdoor Unit Piping Connections
1. Verify the outdoor unit service ports are closed.
2. Remove the caps on the outdoor unit piping connections.
3. Connect the gas piping first to ROOM A, then to ROOM B, then to ROOM C, in that
order. Number of connections will differ depending on outdoor unit.
4. Tighten each gas piping connection individually following the "Tightening the Flare Nuts"
procedure below.
5. Connect the liquid piping first to ROOM A, then to ROOM B, then to ROOM C, in that
order. Number of connections will differ depending on outdoor unit.
6. Tighten each liquid piping connection individually following the "Tightening the Flare
Nuts" procedure below.
Tightening the Flare Nuts
Tightening Torque for Flare Nuts.
Pipe Size (in. O.D.) Outside Diameter (mm)
1/4
3/8
1/2
5/8
3/4
1. When connecting the flare nuts, coat the flare (outside only) with polyvinyl ether (PVE) refrigeration oil only.
Do not use polyolyester (POE) or any other type of mineral oil as a thread lubricant. These lubricants are not compatible with the PVE oil
used in this system and create oil sludge leading to equipment damage and system malfunction.
Do not add any contaminants inside the refrigerant piping.
2. Initially hand tighten the flare nuts using three (3) or four (4) turns.
3. To finish tightening the flare nuts, use both a torque wrench and a backup wrench.
4. After all the piping has been connected and the caps have been tightened, check for refrigerant gas leaks.
Using the Connection Socket
Some indoor units require the use of a connection socket when piping the indoor units
to the outdoor unit. (See previous page for information.) The connection sockets are
included as a factory-supplied accessory with the indoor units. To install:
1. Align the center of the piping sections as seen in the diagrams at right and below.
2. Follow the "Tightening the Flare Nuts" procedure above.
Figure 46: Connection Socket Diagram.
Flare
A
to
Outdoor
Unit
INSTALLING MULTI F SYSTEMS
Tightening Torque (ft-lbs.)
13.0 - 18.0
6.35
9.52 24.6 - 30.4
12.7 39.8 - 47.7
15.88 45.4 - 59.3
71.5 - 87.5
19.05
B
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 45: Connection Socket Diagram, External View.
Figure 47: Performing Connections.
Flare
to
Indoor
Unit
Figure 44: Close Up of the Field Piping to the
Outdoor Unit Piping Connection.
A
Connection Socket
Connection Socket
B
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