Electrical Control Principle
1. Overview
HB21T refrigerator electrical control principle:
Whole wind cooling design, with controlling of fixed frequency compressor.
Temperature in the fridge is controlled by the fridge sensor R controlling the switch of the air
escaper..
Temperature in the freezer is controlled by the freezer sensor F controlling the operating of
the compressor.
2. Main Control Board of HB21T
There are 9 socket connectors on the main control board of HB21T
First, let’s look at the socket connector:
CN1 is the socket connector for the fridge, parts from left to right are:
1-2 Connect to fridge sensor. We can check the resistance of fridge sensor by tests these
two wires. The resistance range of fridge sensor should be 6.35-3.88KΩ if it works right
(correspond to 0℃-10℃).The resistance range should be 2.45-1.58 KΩ at regular temperature
(correspond to 20℃-30℃).
3-4 Connect to the fridge door switch. They are connected when the door is open, and
disconnected when it is shut.
5-6 Heater of fridge air escaper. Measurement of the two wires gives the output voltage
(DC 12V) and the resistance (144Ω±10%) of the heater;
7-10 Connect to air escaper motor.
CN4 Parts from left to right are,
1-2 Connect to Freezer sensor. We can check the resistance of freezer sensor by tests
these two wires. The resistance range of freezer sensor should be 10.9-25.19KΩ if it works right
(correspond to -10℃- -25℃).The resistance range should be 2.49-1.61 KΩ at regular
temperature (correspond to 20℃-30℃).
3-4 Connect to the defrost sensor; Measurement is same as freezer sensor.
5-6 Connect to the freezer door switch. They are connected when the door is open, and
disconnected when it is shut.
7-9 Connect to cooling fan motor. Measurement of the 8-9 two wires gives the output
voltage (DC 11-13V) of the cooling fan motor.
10-12 Connect to freezer motor. Measurement of the 11-12 two wires gives the output
voltage (DC 11-15V) of the freezer motor.
CN5 is the socket connector for the display panel on the door, parts from left to right are:
1-2 are spare.
3-6 Connect to the display panel on the door, Measurement of the 3-4 two wires gives the
output voltage (DC 12V).
7-8 Connect to the environment temperature sensor.
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