Heat Sink Control - LG AH-W096A0 Service Manual

Control logic

9. Heat sink control

9.1 Function
: Power module failure protection by checking the temperature of heat sink.
There is a temperature sensor for checking the heat sink temperature.
9.2 Heat sink sensor failure error
Short Check : if temperature ≥130˚C
Open Check : if temperature < - 30˚C
System will go in self diagnosis (error 65) is displayed and product stops.
9.3 Heat sink temperature control
a)Heat sink temperature < T1 : No limitation on compressor frequency
b)Heat sink temperature < T2 : Compressor frequency fixed
c)T2 ≤ heat sink temperature < Toff : Compressor frequency down by a Hz in a minute
d) Heat sink temperature ≥ Toff : Compressor will be off.
System will stop if this situation occurs 5 times in 1 hour and error code will be generated also self diagnosis will start.
If high temperature situation occurs 5 times in 1 hr system counts 1 error and after that 4 times if this situation occurs
system stops and give error code.
If the temperature reached Toff condition system will count 5 times after that and system will stop with error code.
Toff °C
T2 °C
T1 °C
COMP Hz
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Only for training and service purposes
Heat Sink temp
Frequency Frequency
Set
Hz
frequency fixed
Down
Hz
OFF
fixed Down
- 41 -
Set
OFF
frequency
LGE Internal Use Only