LG MULTI V ARUN072BTE4 - Phase Detection; Pressure Switch

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MULTI V IV Outdoor Unit Service Manual
PROTECTION CONTROLS
Phase Detection / Pressure Switch
Phase Detection
Most Multi V systems require three-phase power. The product will display the errors listed in the table below if all three phases / wires aren’t
connected correctly (one [1] or more phases missing).
Error
Terminal Block
Error No.
R S T
Missed Phase
X
50
X
X 5
Table 19: Phase Detection Errors.
If errors occur simultaneously on two or more combined outdoor units, only the smaller outdoor unit number will be displayed. Example: If
Error No. 50 occurs on both the Master and the Slave 1 outdoor units, “501” displays on the LED (Master: ***1, Slave1: ***2).
Pressure Switch
Main PCB has a pressure sensor switch in the wiring between the inverter compressor and the power relay. The pressure sensor switch is
normally on, and has a small electric current from 220V AC.
Never touch the terminal, nor short two wires directly. It may cause physical injury or death.