LG Multi V CRUN Series Service Manual page 167

(2) Control to prevent low pressure
1. If the measured pressure(transformed absolute pressure)from low-pressure sensor satisfies the condi-
tion, take 1 minute periodic control like following graph.
Cooling operation
Comp.: normal step
Outdoor fan: normal
Bypass valve: normal
D
Comp.: keep up the step
Outdoor fan: off/off
C
Hot gas bypass: on
Comp.: steps down
Outdoor fan: off/off
B
Hot gas bypass: on
Comp.: Off
A
(3) Control the discharge temperature
1. At the temperature of compressor discharge pipe >115°C, turn on the liquid injection valve.
2. With the control of discharge temperature, the control of LEV in indoor unit carried out like following
graph.
Inverter compressor,
Constant speed compressor
(the existing control)
A
(CSC,InvC)125°C
Frequency: down
B
Liquid injection: on
(InvC)120°C
ICOF: keep up the Frequency
C
Liquid injection: on
(CSC,InvC)115°C
D
Comp.: normal operation
Liquid injection: off
Comp.: off
Liquid injection: off
Heating operation
Comp.: normal step
Outdoor fan: normal
D
Bypass valve: normal
Comp.: keep up the step
Outdoor fan : high/high
C
Hot gas bypass: on
Comp.: steps down
Outdoor fan: high/high
B
Hot gas bypass: on
A
Inverter compressor
(Indoor unit emergency control)
C
105°C
D
Comp.: normal step
Indoor unit table: return to normal
95°C
CSC: Constant Speed Compressor
InvC: Inverter Compressor
ICOF: Inverter Compressor Operation Frequency
Operation detail
Comp.:off
Indoor LEV Control
Service Manual 167
95°C