- 197 -
Copyright ©2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
1.1 Normal operation
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. Basic control
Compressor
Fan
Main EEV
4way valve
Subcooling
EEV
Fuzzy control
Fuzzy control
Full open
Off
Fuzzy control
• Normal : minimum pulse
• Avoiding control of high
discharge temperature
Fuzzy control
Fuzzy control
Fuzzy control
On
Cooling operation Heating operationActuator
stop
stop
After 15min,
min. pulse
After 15min, Off
After 15min,
min. pulse
Stop state
(1) The sequence of compressor operation for 3 unit system
INV C1 C2 C3 C4 C5
SUB2SUB1Main
1) Stage increasing situation
Inv → C3→ C5→ C2→ C4 → C1(full)
Inv → C5→ C2→ C4 → C3→ C1(full)
Inv → C2→ C4 → C3→ C5→ C1(full)
Inv → C4 → C3→ C5→ C2→ C1(full)
2) Stage decreasing situation
Full → C1→ C5→ C2→ C4 → C3→ Inv
Full → C1→ C2→ C4 → C3→ C5→ Inv
Full → C1→ C4 → C3→ C5→ C2→ Inv
Full → C1→ C3→ C5→ C2→ C4 → Inv
Function
*Stage means how many constant compressors operate
Example) Stage 2: 2 constant compressors operate
Stage 1: 1 constant compressor operate
To Next Page
Loading...
Need help?
General
