LG LRFD21855ST - Temperature Sensor Circuit

3. Open Door Detection Circuit Check
8-2-3 Temperature Sensor Circuit
• The resistance of the SENSOR has a ±5% common difference.
• Measure the resistance of the SENSOR after leaving it for over 3 minutes in the measuring temperature.
This delay is necessary due to sensor response speed.
- 29 -
Closed 0 V
Open 5 V
Freezer/
Refrigerator Door
Measurement
Location
Pin 4 & 5 of con4 Ref.Door
Pin 5 & 6 of con5 Fre.Door
TEMPERATURE
RESISTANCE OF FREEZER
RESISTANCE OF REFRIGERATOR &
SENSOR DEFROST SENSOR & ROOM SENSOR
- 20 ˚C (-4 °F) 22.3 KΩ 77 KΩ
- 15 ˚C (5 °F) 16.9 KΩ 60 KΩ
- 10 ˚C (14 °F) 13.0 KΩ 47.3 KΩ
- 5 ˚C (23 °F) 10.1 KΩ 38.4 KΩ
0 ˚C (32 °F) 7.8 KΩ 30 KΩ
+ 5 ˚C (41 °F) 6.2 KΩ 24.1 KΩ
+ 10 ˚C (50 °F) 4.9 KΩ 19.5 KΩ
+ 15 ˚C (59 °F) 3.9 KΩ 15.9 KΩ
+ 20 ˚C (68 °F) 3.1 KΩ 13 KΩ
+ 25 ˚C (77 °F) 2.5 KΩ 11 KΩ
+ 30 ˚C (86 °F) 2.0 KΩ 8.9 KΩ
+ 40 ˚C (104 °F) 1.4 KΩ 6.2 KΩ
+ 50 ˚C (122 °F) 0.8 KΩ 4.3 KΩ