LG ARNU Series - Page 203

- 203 -
Copyright ©2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
Inv Compressor
Fan
Main EEV
4way valve
Subcooling EEV
Min. frequency
0Hz
Full open
On → off
min.
StartingComponent
Sub unit
compressor
All off
Hot gas bypass
valve
On
60 Hz
High pressure
control
Full open
Off
min.
Running
On
On
30 Hz
High pressure
control
Base pulse
On
min.
Ending
Off
On
Function
2.2 Defrost
Starting Condition
Starting defrost control if one case of bellowing cases is satisfied
[1] 1-UNIT Model
a) air temp. ≥ 0°C : hex pipe temp. < -7°C
b) -5°C < air temp. < 0°C : hex pipe temp. < (air temp.-8°C)
c) air temp. ≤ -5°C : hex pipe temp. < (air temp. -11°C)
[2] 2 & 3 UNITS Model
1) Partly defrost
When there is one or more bellowing cases of hex pipe temp. as each unit
a) air temp. ≥ 0°C : hex pipe temp. < -10°C
b) air temp. < 0°C : hex pipe temp. < (air temp.-11°C)
2) All defrost
When all hex pipe temp. is satisfied bellowing cases
a) air temp. ≥ 0°C : hex pipe temp. < -7°C
b) -5°C < air temp. < 0°C : hex pipe temp. < (air temp._8°C)
c) air temp. ≤ -5°C : hex pipe temp. < (air temp. -9°C)
■ Comp. combination during oil return control
Pressure limit Normal
Before 70sec.
1 unit
2 unit
3 unit
Before 70sec.after 70sec. after 70sec.
1unit(half size) minimum Hz
50 Hz
minimum Hz
minimum Hz +
constant comp.1
60 Hz
80 Hz
45 Hz +
constant comp.1
45 Hz +
constant comp.2
50 Hz
60 Hz
minimum Hz +
constant comp.1
minimum Hz +
constant comp.2
80 Hz
60 Hz +
constant comp.1
60 Hz +
constant comp.2
60 Hz +
constant comp.3
minimum Hz : temp. out excess -5°C: 30Hz
temp. out below -5°C : 40Hz