Refrigerator thermostat knob switch how regulation?

Refrigerators are equipped with an internal thermostat knob. Temperature control knob scale indicated 0,1,2,3,4 other digital, does not refer to the actual inside temperature is generally higher the number, the temperature inside can reach the lower, generally refrigerator compressor working time longer. Adjusting the temperature, the temperature control knob clockwise, can control the temperature drop, but not too low a tone. After each adjustment, to observe a one two hours. During this period the thermostat will automatically open to stop several times (not more than 6 times per hour). Subject to temperature stability, if not yet reached the desired temperature, to make a second, third revision. If once the temperature dial set too low, refrigerator compressor will run continuously for a long time, there is no "breathing space" opportunities, this will shorten the life of the compressor.