LG multi V PLUS Service Manual

Service Manual 205
Function
1.4 subcooling LEV control
Subcooling LEV works with fuzzy rules to maintain the subcooling degree at the outlet of subcooler during
cooling mode
Subcooling degree = Tcondensation -Tliquid
Tliquid : temperature at outlet of subcooler(˚C)
Tcondensation : condensation temperature equivalent to high pressure(˚C)
1.5 Fan control
Main unit's fan motor operates with inverter drive by fuzzy control and sub units°Ø fan motors are all step
motors.
2.1 Oil return control
2.1.1 Oil return control on cooling mode
Fan Step
Left fan Right fan
0 Stop Stop
1 Low Stop
2 High Stop
3 Low Low
4 High Low
5 High High
Fan frequency
<5 Hz
5Hz ≤ Frq < 10Hz
10 Hz ≤ Frq < 20Hz
20 Hz ≤ Frq < 30Hz
30 Hz ≤ Frq < 40Hz
Frq ≥ 40Hz
Sub unit Main unit
Inv Compressor
Fan
Main LEV
4way valve
Subcooling LEV
30 Hz
0Hz
Full open
Off
min.
StartingComponent
Sub unit ’s
compressor
All off
Hot gas bypass
valve
Off
60 Hz
High pressure
control
Full open
Off
min.
Running
On
Off
30 Hz
High pressure
control
Base pulse
Off
min.
Ending
Off
Off
1. Basic control

LG multi V PLUS Specifications

General

Brand	LG
Model	multi V PLUS
Category	Air Conditioner
Language	English