Cycle Changes By Amount Of Refrigerant - LG MULTI V 5 Manual Book

4.4 Abnormal cycle (Refrigerant Overcharging / Shortage)
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5. Cycle Changes by amount of refrigerant

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5.1 Cooling cycle

5. Cycle Changes by amount of refrigerant

5.1.1 A cycle changes by refrigerant overcharging
5.1 Cooling cycle
When overcharging a refrigerant more than necessary, an extra refrigerant will be stored in con-
5.1.1 A cycle changes by refrigerant overcharging
densing HEX and liquid pipe because of high density. Overcharged refrigerant can make changing
the cycle as below.
When overcharging a refrigerant more than necessary, an extra refrigerant will be
To make clear distinction, all IDU's should be operated, and wait at least 20 minutes after system
stored in condensing HEX and liquid pipe because of high density. Overcharged
refrigerant can make changing the cycle as below.
started until cycle is stabilized
To make clear distinction, all IDU's should be operated, and wait at least 20 minutes
after system started until cycle is stabilized
• ODU HEX
: Accumulation of refrigerant in condensing area → Increasing liquid area (SC ↑)
• ODU HEX
→ Performance ↓ → High Pressure ↑
: Accumulation of refrigerant in condensing area  liquid area increase (SC ↑)
• ODU Fan
 Performance ↓  High Pressure ↑
: RPM ↑ to reduce high pressure
• ODU Fan
: RPM ↑ to reduce high pressure
Outdoor Unit Fan
ODU Main EEV
liquid
2-phase
[SC EEV, Sub cooling(SC)]
SC EEV
2-phase
Liquid area↑  SC↑
 Density of refrigerant ↑
 SC EEV ↓
IDU EEV
Indoor unit HEX
[IDU EEV]
SC↑  Density of refrigerant ↑
 IDU EEV ↓
Indoor unit Fan
* In case of refrigerant shortage, cycle will show opposite response.
* In case of refrigerant shortage, cycle will show opposite response.
[Discharge Super heat(SH)]
ODU HEX
Density of refrigerant for suction ↑
 Circulating more refrigerant
than same Hz  Comp. cooling
effect ↑  Discharge SH↓
superheat
comp
[Comp. Hz]
Base pressure ↑(OFF condition
pressure)  Difference
between target low pressure
and base pressure ↑ Comp
Hz ↑
[Indoor SH]
EEV is controlled for SH=0~5℃ until 110pulse
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