LG multi V PLUS, Service Manual

Page: 216 / 373

216 Outdoor Unit
3.4 Phase detection
■
Main unit
- Inverter PCB has phase fault detection circuit. If a phase is missed or phases are reverse, Led Lamp is on
when power is on.
■
Sub unit
- Sub PCB has phase fault detection circuit. If a phase is missed or phases are reverse, phase fault error
happen and led 6 lamp is on.
• Phase fault detection is enable only for 5 sec after power is on.
3.5 Pressure switch
■
Sub unit
- Sub PCB has pressure switch connecting compressor with power relay and PCB.
- Pressure switch's state is on normally, so has small current of 220V AC.
Never touch the connecting terminal with hand or connect two wires directly.
Function
3.3 Inverter protection control
AD-CT>245
item
230
≤
AD-CT < 245
AD-CT < 230
DC Peak
High pressure switch
Low voltage
System stop
control
Inv compressor 5Hz down/sec
Inv. Compressor normal control
System stop
System stop
System stop