LG LDC22720 Series, Service Manual

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7. DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM
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7-1 FUNCTION
7-1-1 Function
1. When the appliance is plugged in, it is set to for Refrigerator and “4” for freezer.
You can adjust the Refrigerator and the Freezer control temperature by pressing the ADJUST button.
2. When the power is initially applied or restored after a power failure, it is automatically set to “4” & “4”.
7-1-2 Control of freezer fan motor
1. Freezer fan motor has high and standard RPMs.
2.High RPM is used when electricity is first on, for ICE PLUS, and when refrigerator is overloaded.
But standard RPM is used for general purposes.
3. To improve cooling speed and load corresponding speed, the RPM of freezer fan motor shall change from normal
speed to high speed.
4. High speed (2500RPM): initial power on or load corresponding operation, ICE PLUS.
Normal speed (2200RPM): general working conditions.
7-1-3 ICE PLUS
1. The purpose of this function is to intensify the cooling speed of freezer and to increase the amount of ice.
2. Whenever selection switch is pressed, selection/release, the LED will turn ON or OFF.
3. If there is a power cut and the refrigerator is power on again, ICE PLUS function will be canceled.
4. To activate these function you need to press the ICE PLUS key and the LED will turn ON. This function will remain
activated for 24 hrs. The first three hours the compressor and ICE PLUS will be ON. The next 21 hours the freezer
will be controlled at the lowest temperature. After 24 hours or if the ICE PLUS key is pressed again, the freezer will
return to its previous temperature.
5. For the first three hours notice the following cases:
(1) Compressor and freezer fan (HIGH RPM) continuously operate for three hours.
(2) If defrost starts during ICE PLUS, ICE PLUS operates for the rest of time after defrost is completed, when ICE
PLUS operation time is less than 90 minutes
If ICE PLUS operates for more than 90 minutes, the ICE PLUS will operate for one hour after defrost is completed.
(3) If ICE PLUS is pressed during defrost, ICE PLUS LED is on but this function will start seven minutes after defrost
is completed and it shall operate for three hours.
(4) If ICE PLUS is selected whitin seven minutes after compressor has stopped, the compressor (compressor
delaysseven minutes) shall start after the balance of the delay time.
(5) The fan motor in the freezer compartment rotates at high speed during ICE PLUS.
6. For the rest of 21 hours, the freezer will be controlled at the lowest temperature.
7-1-4 REFRIGERATOR LAMP AUTO OFF
1. To protect the risk of lamp heat, when Refrigerator door opens for 7 min., Refrigerator lamp is auto off.