LG R410A - Special Control Functions

Service Manual 93
2.1 Oil return control
2.1.1 Oil return control on cooling mode
■ High pressure limit
■ Low pressure limit
■ Oil return operation time : 4 min for running step
■ Starting condition:every 6 hours operate
Inv
Compressor
Normal
Pressure
limit
Fan
Main LEV
4way valve
Subcooling LEV
37Hz + 37Hz 90Hz + 90Hz 20Hz + 20Hz
30Hz + 30Hz 50Hz + 50Hz 20Hz + 20Hz
0Hz
Full open
Off
min.
StartingComponent
Pressure range
Low pressure ≤ 229 kpa
Low pressure ≥ 242 kpa
Compressor combination
Refer to combination table
Normal
Sub unit
compressor
All off
Hot gas bypass
valve
Off
High pressure
control
Full open
Off
min.
Running
On
Suction pipe temp.
control
High pressure
control
Full open
Off
min.
Ending
Off
Off
Fan Keep state
StartingIndoor unit
Thermo on unit
LEV
Oil return
pulse
Keep state
Running
Oil return operation
pulse
Keep state
Ending
Return to
base pulse
Thermo off unit
LEV
Close pulse
Oil return operation
pulse
Close pulse
Pressure range
Low pressure ≤ 3189 kpa
Low pressure ≥ 3189 kpa
Compressor combination
Refer to combination table
Normal
2. Special control
Function