30
Four-W
ay Ceiling Cassette System Engineering Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
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LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
INDOOR UNIT REFRIGERANT FLOW DIAGRAM
Table 12: LCN187, 188HV4~427HV 4-Way Ceiling Cassette IDU Thermistor Details.
Model No.
Vapor (inch)
Liquid (inch)
LCN187HV, LC247HV,
LCN367HV, LC427HV
5/8
3/8
LCN188HV4
1/2
1/4
Table 13: LCN187, 188HV4~427HV 4-Way Cassette IDU Refrigerant Pipe Connections.
Description (Based on Cooling Mode)
PCB Connector
Indoor Air Temperature Thermistor
CN-ROOM
Evaporator Inlet Temperature Thermistor
CN-PIPE / IN
Evaporator Outlet Temperature Thermistor
CN-PIPE / OUT
Heat exchanger
Gas pipe connection port
(flare connection)
Liquid pipe connection port
(flare connection)
Turbo fan
Cooling
Heating
M
Indoor Air
Temperature Thermistor
Evaporator Inlet
Temperature Thermistor
Evaporator Outlet
Temperature Thermistor
Figure 23: LCN187, 188HV4, 247HV, 367HV, 427HV Refrigerant Flow Diagram.
LCN187HV,188HV4, 247HV, 367HV, 427HV
Table 14: LCN187, 188HV4~427HV 4-Way Cassette IDU Refrigerant Pipe Sizes.
Model No.
Vapor (inch)
Liquid (inch)
LCN187HV, LC247HV,
LCN367HV, LC427HV
5/8
3/8
LCN188HV4
5/8
3/8
Table 15: LCN188HV4 Connection Socket Dimensions.
Model No.
Vapor (inch)
Liquid (inch)
LCN188HV4
Ø1/2 – Ø5/8
Ø1/4 – Ø3/8
Figure 24: LCN188HV4 Refrigerant Pipe Connections
1/2 in. to 5/8 in.
Connection
Ø5/8 in.
Connection socket
Flare nut
Piping
Ø1/2 in.
1/4 in. to 3/8 in.
Connection
Flare side to indoor unit
Ø3/8 in.
Connection socket
Flare nut
Piping
Ø1/4 in.
Flare side to indoor unit
Flare
side pipe
from ODU
Flare
side to
ODU