LG PREMTC00U Owners & Installation Manual page 262

InSTALLATIOn & LAYOUT BEST PRACTICES
refrigerant Piping System Layout
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 179 for Multi F outdoor unit connection types.
table 178: outdoor unit Piping connections.
outdoor unit Piping connections
Liquid Line connection (in., oD) x Qty.
Vapor Line connection (in., oD) x Qty.
table 179: indoor unit Piping connections.
indoor unit capacity Vapor Line connection (in., oD) Liquid Line connection (in., oD)
9,000 Btu/h
12,000 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 180: connection socket Dimensions.
indoor unit capacity
18,000 Btu/h
24,000 Btu/h
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.
210 | DeSiGn & PracticeS
LMu187HV LMu247HV
1/4 x 2 1/4 x 3
3/8 x 2 3/8 x 3
Ø3/8
Ø1/2
Vapor (in., oD) Liquid (in., oD)
a B a
Ø3/8 → Ø1/2 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.
LMu369HV
1/4 x 4
3/8 x 4
Ø1/4
figure 73: connection socket Diagram.
Flare
A
B
to
Outdoor
Unit
figure 74: Performing connections.
Connection Socket
(Factory-supplied with
the indoor unit)
MULTI
MULTI
figure 72: Multi f Refrigerant Pipe connections
(LMu369HV shown as example).
Gas Piping Connections
A-UNIT
Liquid
B-UNIT
Piping
Connections
C-UNIT
D-UNIT
F
F
MAX
Main gas
valve
Main liquid
valve
B
Flare
to
Indoor
Unit