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

1. Basic control

1.1 Normal operation

Actuator
Compressor
Fan
Main EEV
4 way valve
Subcooling
EEV
Note: Heating operation is not functional at an outdoor air temperature of 27°C 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, Te:2 ~ 5°C)
(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.
(1) The sequence of compressor operation for 3 unit system
INV C1
Main
1) Stage increasing situation
Inv C3 C5 C2
Inv C5 C2 C4
Inv C2 C4 C3
Inv C4 C3 C5
*Stage means how many constant compressors operate
Example) Stage 2: 2 constant compressors operate
Stage 1: 1 constant compressor operate
Copyright ©2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Cooling operation Heating operation
Fuzzy control
Fuzzy control
Full open
Off
• Normal : minimum pulse
• Avoiding control of high
Fuzzy control
discharge temperature
C2 C3
SUB1
C4 C1(full)
C3 C1(full)
C5 C1(full)
C2 C1(full)
Fuzzy control
Fuzzy control
Fuzzy control
On
C4
SUB2
2) Stage decreasing situation
Full C1 C3 C5 C2
Full C1 C5 C2 C4
Full C1 C2 C4 C3
Full C1 C4 C3 C5
- 197 -
Function
Stop state
stop
stop
After 15min,
min. pulse
After 15min, Off
After 15min,
min. pulse
C5
C4 Inv
C3 Inv
C5 Inv
C2 Inv
LGE Internal Use Only