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Copyright ©2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
Function
Note : Heating operation is not functional at an outdoor air temperature of 27°C(81°F) or more.
1.2 Compressor control
Fuzzy control : Maintain evaporating temperature(Te) to be constant on cooling mode and condensing tem-
perature(Tc) on heating mode by Fuzzy control to ensure the stable system performance.
(Tc:47 ~51°C(117~124°F), Te:2 ~ 5°C(36~41°F)
(1) Cooling mode
Te can be set by initial DIP switch setting. (Standard, Long pipe)
(2) Heating mode
Tc can be set by initial DIP switch setting. (Standard, Long pipe)
Note: By setting DIP switch, Te and Tc are decided simultaneously.
1.1 Normal operation
1. Basic Control
Compressor
Fan
Main EEV
4 way valve
Subcooling
Indoor Unit
EEV
EEV
Fuzzy control
Fuzzy control
Full open
OFF
Fuzzy control
Superheat fuzzy
control
Fuzzy control
Subcooling fuzzy control
Fuzzy control
Fuzzy control
Fuzzy control
ON
Cooling operation Heating operationActuator
Stop
Stop
Close
OFF
1 hour after stop & outdoor temp.
< 27˚C(81˚F)
Close
Before 10 min. : Min. pulse
After 10 min. : Max. pulse
Stop state
Fuzzy Control
Stop(0Hz)
Min. frequency
Fuzzy control start
Target
Inverter linear control as cooling and heating load increasing
System Capacity
Cooling and heating load
(Linear Control)(Linear Control)(Linear Control)
InverterInverter
CompressorCompressor
Inverter
Compressor