Piping Connections; Idu To Odu - LG LMN078HVT Installation & Maintenance

PIPING CONNECTIONS

IDU to ODU

Multi F Outdoor Unit to Indoor Unit 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 outdoor unit connection types.
Table 21: Outdoor Unit Piping Connections.
Outdoor Unit Piping Connections
Liquid Line Connection (in., OD) x Qty.
Vapor Line Connection (in., OD) x Qty.
Table 22: Wall Mounted Indoor Unit Pipe Sizes.
Vapor Line Size
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
Table 23: Wall Mounted Indoor Unit Piping Connections.
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
Connection sockets (included as a factory-supplied accessory with the indoor
units) may need to be used when piping the indoor units to the outdoor unit.
Table 24: Connection Socket Dimensions.
Vapor (in., OD)
Indoor Unit
Capacity
A
18,000 Btu/h Ø3/8 → Ø1/2, Ø1/2 → Ø5/8
24,000 Btu/h Ø3/8 → Ø1/2
Using the Connection Socket
1. Align the center of the piping sections and tighten the flare nut by
hand.
2. Tighten the flare nut with a torque wrench, using the arrows on
the wrench as a guide, until a click is heard.
32
LMU18CHV LMU24CHV LMU30CHV LMU36CHV
1/4 x 2
3/8 x 2
Liquid Line Size
(in., OD) (in., OD)
Ø3/8
Ø1/4
Ø1/2
Vapor Line Liquid Line
Connection (in., OD)
Ø3/8 Ø1/4
Ø5/8 Ø3/8
Ø1/2 Ø1/4
Liquid (in., OD)
B A
Ø1/4 → Ø3/8
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.
1/4 x 3 1/4 x 4 1/4 x 4
3/8 x 3 3/8 x 4 3/8 x 4
Figure 36: Multi F Refrigerant Pipe Connections
Liquid
Piping
Connections
Figure 37: Connection Socket Diagram.
Flare
A
to
Outdoor
Unit
Figure 38: Performing Connections.
B
MULTI
MULTI
(LMU36CHV shown as example).
Gas Piping Connections
A-UNIT
B-UNIT
C-UNIT
D-UNIT
Main gas
valve
Main liquid
valve
Connection Socket
(Factory-supplied with
the indoor unit)
F
F
MAX
B
Flare
to
Indoor
Unit