LG R410A - Discharge Temperature Control; Inverter Protection Control

Service Manual 99
Function
3.2 Discharge temperature control
3.3 Inverter protection control
System stopCurrent 23A
item control
Inv compressor 5Hz down/3 secCurrent 20A
Inv. compressor no frequency up
Current 17A
Inv. Compressor normal controlCurrent 17A
System stopDC Peak
System stopHigh pressure switch
System stopLow voltage
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Off indoor unit LEV 130 (Only
Heating mode)
Ending : Td ≤ 65°C
Td ≥ 70°C
Do not increase Hz
Ending :Td ≤ 95°C
Td ≥ 102°C
1~5% down / 30 sec.
After operating in 20+20Hz for 60sec.
System off/restart after 3min.
ending: Td <101°C for 30sec.
Td ≥ 106°C
5% open
(every control time)
Td ≥ 110°C
(low press. ≤ 529kPa)
Liquid gathering
operation(heating)
ending : Td < 103°C
Td ≥ 108°C
Control LEV to set
“Subcooler out temp. – evaporating
temp = 8°C”(only heating mode &
Main LEV ≥ 800pls)
+10pulse / 10sec.
(only cooling mode)
Subcooler LEV
Td > 85°C
Adjust target suction
superheat 1.5°C, minimum
suction superheat
0.5°C (only heating mode)
Td > 95°C
5% open
(every control time)
Td ≥ 105°C
(low press. > 529kPa)
Decrease Indoor superheat
Ending : Td < 95°C
Td ≥ 100°C
Main LEV Indoor Unit
System Stop
Td ≥ 115°C
Comp
Discharge Temp.