LG MULTI F Engineering Manual page 205

F
MULTI
F
MULTI MAX
Multi F MAX Outdoor Unit System Piping Connections
Avoid Pipe Damage
• When routing field-provided piping, avoid damaging the outdoor unit from excessive vibration.
• Correctly route the piping so it does not make contact with mounting bolts. Allow room for field installation.
• Properly insulate the liquid and gas lines separately up to the point of connection at the unit frame.
• See table below for Multi F MAX outdoor unit connection types.
Table 123:Outdoor Unit Piping Connections.
Outdoor Unit Piping Connections
Liquid Line Connection (in., OD) x Qty.
Vapor Line Connection (in., OD) x Qty.
Branch Distribution to Indoor Unit Piping Connections
• Install indoor unit liquid and vapor refrigerant pipes (and connection wiring) to the appropriate 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 124:Branch Distribution Unit Piping Connections.
Branch Distribution Unit PMBD3620
Piping Connections to Outdoor Unit
Liquid (in., OD) x Qty.
Vapor (in., OD) x Qty.
Piping Connections to Indoor Units
Liquid (in., OD) x Qty. Ø1/4 x 2
Vapor (in., OD) x Qty. Ø3/8 x 2
Table 125:Indoor Unit Pipe Sizes.
Vapor Line
Indoor Unit Capacity
Connection (in., OD)
7,000 Btu/h
9,000 Btu/h
12,000 Btu/h
15,000 Btu/h
18,000 Btu/h
24,000 Btu/h
36,000 Btu/h
Connection sockets (included as a factory-supplied accessory with the indoor units) may need to be used when piping the indoor units to the
branch distribution unit.
Table 126:Connection Socket Dimensions.
Indoor Unit Capacity
A
18,000 Btu/h Ø3/8 → Ø1/2, Ø1/2 → Ø5/8
24,000 Btu/h
36,000 Btu/h
INSTALLATION & LAYOUT BEST PRACTICES
LMU540HV
3/8 x 1
3/4 x 1
PMBD3630 PMBD3640
Ø3/8 x 1
Ø3/4 x 1
Ø1/4 x 3 Ø1/4 x 4
Ø3/8 x 3 Ø3/8 x 4
Liquid Line
Connection (in., OD)
Ø3/8
Ø1/4
Ø1/2
Ø5/8 Ø3/8
Vapor (in., OD) Liquid (in., OD)
B A
Ø1/4 → Ø3/8
Ø3/8 → Ø1/2
Ø1/2 → Ø5/8 Ø1/4 → 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.
Refrigerant Piping System Layout
Figure 284:Branch Distribution Ports to Indoor Units.
PMBD3641
Ø1/4 x 3, Ø3/8 x 1
Ø3/8 x 3, Ø5/8 x 1
Table 127: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
24,000 Btu/h
36,000 Btu/h
Figure 285:Connection Socket Diagram.
A
B
N/A
A B C D
Vapor Line
Connection (in., OD) Connection (in., OD)
Ø3/8
Ø5/8
Ø1/2
Ø5/8
Connection Socket
DESIGN & PRACTICES | 205
Liquid Line
Ø1/4
Ø3/8
Ø1/4
Ø3/8
B