LG LMN078HVT Installation & Maintenance page 33

F
MULTI
F
MULTI MAX
Multi F System Piping Connections
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 25: Tightening Torque for Flare Nuts.
Pipe size (Inches O.D.)
1/4Ø
3/8Ø
1/2Ø
5/8Ø
Figure 39: Possible Outdoor Unit or Branch Distribution Unit to Indoor Unit Connections.
1. 3/8 in. to 3/8 in. Connection
Ø3/8 in.
Flare side to
branch distribution unit or ODU
3. 1/2 in. to 5/8 in.
Connection
Ø1/2 in.
Flare
side pipe
from branch distribution unit or ODU
Torque
wrench
Tightening torque (ft-lbs)
13.9 - 18
24.5 - 30.3
39.7 - 47.7
45.5 - 59.2
Flare side to indoor unit
Ø3/8 in.
Piping
Flare nut
Piping
Flare side to indoor unit
Flare nut
Ø5/8 in.
Connection socket
Spanner
Flare nut
Field Piping
Due to our policy of continuous product innovation, some specifications may change without notification.
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PIPING CONNECTIONS
Width of the flare (A [inches])
1/8
1/8
1/8
1/16
2. 3/8 in. to 1/2 in.
Flare nut
Connection
Connection socket
Ø3/8 in.
Flare
side to
branch distribution unit or ODU
4. 1/4 in. to 3/8
Flare nut
Connection
Connection socket
Ø1/4 in.
Flare
side to
branch distribution unit or ODU
IDU to ODU
Figure 40: Tightening the Flare Nuts.
Union
Piping
Flare side to indoor unit or
pipe to indoor unit
Ø1/2 in.
Piping
Flare side to indoor unit
Ø3/8 in.
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