Basic Control; Normal Operation; Compressor Control - LG MULTI V IV ARNU07GTU 2 Series Service Manual

Function

1. Basic control

1.1 Normal operation

Actuator Cooling operation
Compressor
Fan
Upper : Min. pulse
Main EEV
*Low : Full open
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 combina-
tion of 10% or less
*: The main EEV of ARUN***LTS4 is controlled in the same way with Low EEV. (ARUN***LTS4 have only 1
Main EEV.)

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, Te:2 ~ 5°C)
(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
Copyright ©2013 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Heating operation
Fuzzy control
Fuzzy control
• Normal : Vapor injection
Fuzzy control
• Avoiding control of high
discharge temperature
Superheat fuzzy
Subcooling fuzzy control
control
Target
Fuzzy control
Fuzzy control
Fuzzy control
(Linear Control) (Linear Control) (Linear Control)
Inverter linear control as cooling and heating load increasing
- 18 -
Stop state
stop
stop
Min. pulse
Min. pulse
Min. pulse
Inverter
Comp 4
Inverter Inverter
Comp 3 Comp 3
Inverter Inverter
Inverter
Comp 2 Comp 2
Comp 2
Inverter Inverter
Inverter
Comp 1 Comp 1
Comp 1
Cooling and heating load
LGE Internal Use Only