Basic Control; Normal Operation; Compressor Control - LG ARUN Series Service Manual

Function

1. Basic control

1.1 Normal operation

Actuator Cooling operation
Compressor
Fan
Main EEV
4 way valve
Subcooling
EEV
Indoor Unit
EEV
Note : Heating operation is not functional at an outdoor air temperature of 27°C(80°F) or more.
Cooling operation is not functional at an outdoor air temperature of 2°C(36°F) 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 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. (Normal mode, capacity up mode, and energy save mode)
(2) Heating mode
Tc can be set by initial dip switch setting. (Normal mode, capacity up mode, and energy save mode)
Note: By setting dip switch, Te and Tc are decided simultaneously.
Fuzzy control start
Min. frequency
Stop(0Hz)
Fuzzy Control
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Only for training and service purposes
Heating operation
Fuzzy control
Fuzzy control
Full open
Off
• Normal : minimum pulse
• Avoiding control of high
Fuzzy control
discharge temperature
Superheat fuzzy
Subcooling fuzzy control
control
Target
Fuzzy control
Fuzzy control
Before 15 min. : Max. pulse
Fuzzy control
After 15 min. : Min. pulse
On
Before 15 min. : Max. pulse
After 15 min. : Min. pulse
Before 10 min. : Min. pulse
After 10 min. : Max. pulse
(Linear Control) (Linear Control) (Linear Control)
Constant Speed
Compressor
Inverter
Comperssor
Inverter linear control as cooling and heating load increasing
- 22 -
Stop state
stop
stop
After 60 min. : Off
Inverter
Comperssor
Constant Speed
Compressor
C
Inverter
Comperssor
Constant Speed Constant Speed
Compressor Compressor
A A
Inverter
Comperssor
Constant Speed Constant Speed
Compressor Compressor
B B B
Cooling and heating load
LGE Internal Use Only