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Control electronics for car air conditioning systems

Car air conditioning system - Valeo India

The ventilation power of a car A/C system is adjusted by a device that controls the blower speed.

Two types of adjustment devices are used in car air conditioning systems.

The system architecture determines the type of control device:

  • Passive resistive devices contain two or three resistors corresponding to three or four speeds to adjust ventilation power in stages. The resistors are made of wire coils or fitted to a ceramic frame
  • Power transistors enable a continuous adjustment of the air conditioning system