Refrigerant Piping System Installation - LG Multi F Series Installation Manual
Outdoor unit
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Also See for Multi F Series:
- Engineering manual (392 pages) ,
- Installation manual (103 pages) ,
- Owner's manual (234 pages)
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INSTALLING MULTI F SYSTEMS
Multi F Outdoor Unit to Indoor Unit Piping Connections
Avoid Pipe Damage
• When routing field-provided piping,
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.
Correctly route the piping so it does not make contact with mounting bolts. Allow room
Table 20: Outdoor Unit Piping Connections.
Outdoor Unit Piping Connections LMU18CHV LMU24CHV LMU30CHV LMU36CHV
Liquid Line Connection (in., OD) x Qty.
Vapor Line Connection (in., OD) x Qty.
Table 21: 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
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 23: 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
24,000 Btu/h
48
avoid damaging the outdoor unit from excessive
1/4 x 2
1/4 x 3
3/8 x 2
3/8 x 3
Vapor Line
Liquid Line
Piping Size (in., OD)
Ø3/8
Ø1/4
Ø1/2
Liquid (in.,
Vapor (in., OD)
OD)
A
B
A
Ø5/8
N/A
N/A
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 43: Multi F Refrigerant Pipe Connections
(LMU36CHV shown as example).
Liquid
Piping
Connections
1/4 x 4
1/4 x 4
3/8 x 4
3/8 x 4
Table 22: 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
24,000 Btu/h
B
F
MULTI
F
MULTI
MAX
Gas Piping Connections
A-UNIT
B-UNIT
C-UNIT
D-UNIT
Main gas
valve
Main liquid
valve
Vapor Line
Liquid Line
Conn. (in., OD)
Conn. (in., OD)
Ø3/8
Ø1/4
Ø5/8
Ø3/8
Ø1/2
Ø1/4
Ø1/2
Ø1/4
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