Phase Detection / Pressure Switch - LG MULTI V ARUN072BTE4 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).
Table 19: Phase Detection Errors.
Terminal Block
Error
R
X
Missed Phase
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.
16
Error No.
S T
50
X
X 5
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.