Fan control system for the evaporator of refrigerating appliances

A fan control system for the evaporator of refrigerating appliances, of the type in which the internal air is forced to circulate, by action of a fan, through the evaporator of a refrigerating circuit, fed by a compressor comprising:

• a first temperature sensing means disposed to detect the temperature of the air inside the refrigerating appliance at the air inlet of the evaporator;
• a second temperature sensing means disposed to detect the temperature of the evaporator;
• a control circuit, operatively connected to said first and second temperature sensors and to said fan and producing, in response to the temperature values detected by said sensors:
• a fan stop control signal, when the difference between the values of the temperature detected by said first and second sensors reaches a stop value, below which the heat transfer from the forced circulating air to the evaporator is lower than the heat transfer from said fan to said air;
• and a fan start control signal, when said difference between the temperature values reaches, with the reduction of the temperature of the evaporator, due to the compressor operation, a certain start value corresponding to a temperature of the evaporator substantially lower than the temperature of the air in the internal medium.