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52
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 MAX SYSTEMS
Branch
Distribution
Unit
Refrigerant Connections
Pipe Size (in.)
Connectible Indoor Unit Capacity
(Btu/h)
Liquid Vapor
PMBD3620 Ø1/4 x 2 Ø3/8 x 2 7,000, 9,000, 12,000, 15,000, 18,000, 24,000
PMBD3630 Ø1/4 x 3 Ø3/8 x 3 7,000, 9,000, 12,000, 15,000, 18,000, 24,000
PMBD3640 Ø1/4 x 4 Ø3/8 x 4 7,000, 9,000, 12,000, 15,000, 18,000, 24,000
PMBD3641 Ø1/4 x 4
Ø3/8 x 3
7,000, 9,000, 12,000, 15,000, 18,000, 24,000
(A, B, C)
Ø1/2 x 1 24,000, 36,000 (D)
Connection sockets (included as a facto-
ry-supplied accessory with the indoor units)
will need to be used when piping the indoor
units to the branch distribution unit. The
connection sockets for 36k indoor units are
factory supplied with the branch distribution
units. See tables above and below for indoor
unit piping connection and connection socket
dimensions. See the follow page for the
connection socket installation procedure.
Branch Distribution to Indoor Unit Piping Connections
• Install indoor unit liquid and vapor refrigerant pipes (and connection wiring) to the appro-
priate branch distribution ports.
• Clearly note on the indoor unit’s refrigerant piping (liquid, vapor) which branch distribution
port it is connected to (A, B, C, D).
Table 27: Branch Distribution Unit Piping Connections.
Table 28: Indoor Unit Pipe Sizes.
Table 29: Indoor Unit Piping Connections.
Figure 52: Branch Distribution Piping
Connections.
ABC D
Indoor Unit
C a p a c i t y
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
36,000 Btu/h Ø5/8 Ø3/8
Table 30: Connection Socket Dimensions.
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, VAHU
Ø1/2 Ø1/4
24,000 Btu/h Ø1/2 Ø1/4
36,000 Btu/h Ø5/8 Ø3/8
Figure 53: Branch Distribution Ports to Indoor
Units -- Side View.
Indoor Unit Capacity
Vapor (in., OD) Liquid (in., OD)
A B A B
18,000 Btu/h: Wall-Mounted ĺĺ ĺ
15,000 Btu/h: Console;
18,000 Btu/h: Low Static Duct, Four-Way
Cassette, VAHU
ĺ N/A
24,000 Btu/h* ĺ N/A
36,000 Btu/h ĺ ĺ
*No socket adapter is required if connected to Port D on the PMBD3641.
Multi F MAX Outdoor Units
(48, 54, 60 kBtu/h)
(For 7~24 kBtu/h Indoor Units)
(Branch Distribution Unit: PMBD3640)
A
ROO
M
B ROOM
C ROOM
D ROOM
A ROOM
B ROOM
C ROOM
D ROOM
(Branch Distribution Unit: PMBD3641)
(Ports A~C only for 7~24 kBtu/h
Indoor Units;
Port D only for 24 or 36 kBtu/h
Indoor Units)
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