Basic Control; Normal Operation; Compressor Control - LG MULTI V Service Manual

Function

1. Basic control

1.1 Normal operation

Actuator
Compressor
Fan
Main EEV
Subcooling
EEV
Indoor Unit
EEV
Note : Heating operation is not functional at an outdoor air temperature of 27 °C or more.
Cooling operation is not functional at an outdoor air temperature of 2 °C or less with indoor unit
combination of 10% or less

1.2 Compressor control

Fuzzy control : Maintain evaporating temperature(Te) to be constant on cooling mode and condensing
temperature(Tc) on heating mode by Fuzzy control to ensure the stable system performance.
[TC:47~51 °C(116.6~123.8 °F), Te:2~5 °C(35.6~41 °F)]
(1) Cooling mode
Te can be set various step at installation mode.
(2) Heating mode
Tc can be set various step at installation mode.
Note: By setting dip switch, Te and Tc are decided simultaneously.
Fuzzy control start
Min. frequency
Stop(0Hz)
Fuzzy Control
Cooling operation
Fuzzy control
Fuzzy control
Full open
Fuzzy control
Superheat fuzzy
control
Target
- 18 -
Heating operation
Fuzzy control
Fuzzy control
Fuzzy control
Fuzzy control
Subcooling fuzzy control
(Linear Control) (Linear Control) (Linear Control)
Cooling and heating load
Inverter linear control as cooling and heating load increasing
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Stop state
Stop
Stop
Min. pulse
Min. pulse
Min. pulse
Inverter Inverter Inverter
Compressor Compressor Compressor