LG MULTI F Installation Manual page 28

INSTALLATION
Outdoor Unit to Indoor Unit Connections
Table 15: Indoor Unit Pipe Sizes.
Indoor Unit Capacity
Piping Size (in., OD)
7,000 Btu/h
9,000 Btu/h
12,000 Btu/h
15,000 Btu/h
15,000 Btu/h: Console;
18,000 Btu/h
24,000 Btu/h
36,000 Btu/h
Table 17: Connection Socket Dimensions.
Indoor Unit Capacity
18,000 Btu/h: Wall-Mounted
15,000 Btu/h: Console;
18,000 Btu/h: Low Static Duct, Four-Way Cassette,
VAHU
24,000 Btu/h*
36,000 Btu/h
Installing Field Piping to the Branch Distribution Unit Piping Connections
1. Remove any caps, etc., that will be on the branch distribution unit.
2. Tighten each piping connection individually following the "Tightening the Flare Nuts" procedure earlier in this section.
3. When all piping installation has been completed, perform the triple leak / pressure and evacuation tests (see the Final Installation Proce-
dures Section in the Multi F / Multi F MAX or Multi F / Multi F MAX LGRED Outdoor Unit Installation Manual), verify that the system does
not have any leaks, and then fully insulate all joints / connections.
Using the Connection Socket
Some indoor units require the use of a connection socket when piping the indoor units
to the branch distribution unit. (See previous page and below for information.) The
connection sockets are included as a factory-supplied accessory with the indoor units,
or in the case of the 36k indoor unit, it is factory supplied with the branch distribution
units. To install:
1. Remove any caps, etc., that will be on the branch distribution unit.
2. Align the center of the piping sections as seen in the diagram at right.
3. Tighten each piping connection individually following the "Tightening the Flare Nuts" procedure earlier in this section.
4. When all piping installation has been completed, perform the triple leak / pressure and evacuation tests (see the Final Installation Procedures
Section in the Multi F / Multi F MAX or Multi F / Multi F MAX LGRED Outdoor Unit Installation Manual), verify that the system does not have
any leaks, and then fully insulate all joints / connections.
28
Vapor Line Liquid Line
Piping Size (in., OD)
Ø3/8
Ø1/4
Ø1/2
Ø5/8 Ø3/8
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.
Table 16: Indoor Unit Piping Connections.
Indoor Unit Capacity
7,000 Btu/h
9,000 Btu/h
12,000 Btu/h
15,000 Btu/h
18,000 Btu/h: Wall-Mounted
15,000 Btu/h: Console;
18,000 Btu/h: Low Static Duct,
Four-Way Cassette, VAHU
24,000 Btu/h
36,000 Btu/h
Vapor (in., OD) Liquid (in., OD)
A B A
Figure 30: Connection Socket Diagram, External View.
To Branch
Distribution
Connection
MULTI
MULTI
Vapor Line
Conn. (in., OD)
Ø3/8
Ø5/8
Ø1/2
Ø1/2
Ø5/8
B
N/A
N/A
Connection Socket
F
F
MAX
Liquid Line
Conn. (in., OD)
Ø1/4
Ø3/8
Ø1/4
Ø1/4
Ø3/8
To Flared
End of
Field Piping