Idu To Odu - LG MULTI F Installation Manual
Multi-zone heat pump systems
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Also See for MULTI F:
- Engineering manual (224 pages) ,
- Installation manual (65 pages) ,
- Install (9 pages)
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F
MULTI
F
MULTI
MAX
Tightening the Flare
Note:
Do not use polyolyester (POE) or any other type of mineral oil as a thread lubricant. These lubricants are not compatible with PVE oil used in this
system and create oil sludge leading to equipment damage and system malfunction.
1. When connecting the flare nuts, coat the flare (inside and outside) with polyvinyl ether (PVE) refrigeration oil only.
2. Align the center of the piping sections and tighten the flare nut by hand.
3. Tighten the flare nut with a torque wrench and a backup wrench until a click is heard.
4. Wrap insulation around the connection.
5. If it is necessary to loosen the flare nuts, always use two wrenches to do so.
Table 23: Tightening Torque for Flare Nuts.
Pipe size (Inches O.D.)
1/4Ø
3/8Ø
1/2Ø
5/8Ø
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.
Outdoor Unit Piping Connections
Liquid Line Connection (in., OD) x Qty.
Vapor Line Connection (in., OD) x Qty.
Table 25: Ceiling Cassette Indoor Unit Pipe Sizes.
Vapor Line Size
Indoor Unit Capacity
7,000 Btu/h
9,000 Btu/h
12,000 Btu/h
18,000 Btu/h
Table 26: Ceiling Cassette Indoor Unit Piping Connections.
Vapor Line Connection
Indoor Unit Capacity
7,000 Btu/h
9,000 Btu/h
12,000 Btu/h
18,000 Btu/h
Tightening torque (ft-lbs)
13.9 - 18
24.5 - 30.3
39.7 - 47.7
45.5 - 59.2
Table 24: Outdoor Unit Piping Connections.
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
Liquid Line Connection
(in., OD)
(in., OD)
Ø3/8
Ø1/2
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.
PIPING CONNECTIONS
Width of the flare (A [inches])
1/8
1/8
1/8
1/16
1/4 x 3
1/4 x 3
1/4 x 4
3/8 x 3
3/8 x 3
3/8 x 4
Liquid
Piping
Connections
Ø1/4
Figure 41: Multi F Refrigerant Pipe Connec-
tions (LMU36CHV shown as example).
Gas Piping Connections
IDU to ODU
A-UNIT
B-UNIT
C-UNIT
D-UNIT
Main gas
valve
Main liquid
valve
33
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