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48
MULTI F / MULTI F MAX Outdoor Unit Installation Manual
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.
MULTI
F
MAX
MULTI
F
INSTALLING MULTI F SYSTEMS
Connection sockets (included as a factory-supplied accessory with the
indoor units) will need to be used when piping the indoor units to the out-
door unit. See tables above and below for indoor unit piping connection
and connection socket dimensions. If a 36K indoor unit is included, the
connection sockets are included with the Branch Distribution unit.
Table 20: Outdoor Unit Piping Connections.
Figure 43: Multi F Refrigerant Pipe Connections
(LMU36CHV shown as example).
Avoid Pipe Damage
• When routing field-provided piping, avoid damaging the outdoor unit from excessive
vibration.
• Properly insulate the liquid and gas lines separately up to the point of connection at the
unit frame.
• See table below for Multi F outdoor unit connection types.
Main gas
valve
Main liquid
valve
Gas Piping Connections
Liquid
Piping
Connections
A-UNIT
B-UNIT
C-UNIT
D-UNIT
Indoor Unit Capacity
Vapor (in., OD)
Liquid (in.,
OD)
A B A B
18,000 Btu/h: Wall-Mounted
ĺĺ
Ø5/8
ĺ
15,000 Btu/h: Console;
18,000 Btu/h: Low Static
Duct, Four-Way Cassette
ĺ N/A
24,000 Btu/h ĺ N/A
Multi F Outdoor Unit to Indoor Unit Piping Connections
Outdoor Unit Piping Connections LMU18CHV LMU24CHV LMU30CHV LMU36CHV
Liquid Line Connection (in., OD) x Qty. 1/4 x 2 1/4 x 3 1/4 x 4 1/4 x 4
Vapor Line Connection (in., OD) x Qty. 3/8 x 2 3/8 x 3 3/8 x 4 3/8 x 4
Table 21: Indoor Unit Pipe Sizes.
Indoor Unit Capacity
Vapor Line
Piping Size (in., OD)
Liquid Line
Piping Size (in., OD)
7,000 Btu/h
Ø3/8
Ø1/4
9,000 Btu/h
12,000 Btu/h
15,000 Btu/h
15,000 Btu/h: Console;
18,000 Btu/h
Ø1/2
24,000 Btu/h
Table 22: Indoor Unit Piping Connections.
Indoor Unit Capacity
Vapor Line
Conn. (in., OD)
Liquid Line
Conn. (in., OD)
7,000 Btu/h
Ø3/8 Ø1/4
9,000 Btu/h
12,000 Btu/h
15,000 Btu/h
18,000 Btu/h: Wall-Mounted Ø5/8 Ø3/8
15,000 Btu/h: Console;
18,000 Btu/h: Low Static Duct,
Four-Way Cassette
Ø1/2 Ø1/4
24,000 Btu/h Ø1/2 Ø1/4
Correctly route the piping so it does not make contact with mounting bolts. Allow room
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Table 23: Connection Socket Dimensions.
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