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  • Tech tips: Understanding the role of OLP in an Air conditioner compressor

    What Is an OLP?

    An OLP is installed in inside or outside of a compressor to ensure stable temperate control whilst operating. In case of overheating or irregular fluctuation of the voltage, the OLP will turn off the power to ensure safe usage.

An image of OLP Structure(off) An image of OLP Structure(off)
An image of OLP Structure(on) An image of OLP Structure(on)

  • The OLP is short-circuited due to bimetal effected by high temperature. There are two causes for short-circuit issues : the direct cause due to the heat on the Bimetal plates, and the indirect cause due to the electric current.

An image of OLP Structure - internal type(off) An image of OLP Structure - internal type(off)
An image of OLP Structure - internal type(on) An image of OLP Structure - internal type(on)

  • OLP Preliminary Tests before Receiving Approval Status for Air conditioner

    Condenser Block Test : Check the OLP performance at high temperature
    Voltage Fluctuate Test : Check the performance with over current in low/high voltage

An image of OLP Curve An image of OLP Curve

  • It is necessary to determine the suitability of the OLP in all AC Sets according to the OLP curve spec.

An image of OLP Curve Example1 An image of OLP Curve Example1

  • Electric Current 15A Ambient Temp. 110℃

    In case of operation in non-operating condition, frequent OLP operation could potentially cause problems with the cooling/heating operation rate and reduce the efficiency.

An image of OLP Curve Example2 An image of OLP Curve Example2

  • Electric Current 21A Ambient Temp. 135℃

    If the OLP does not operate in the operating condition, it may be due to a damage in the motor winding caused by high temperatures, resulting in the damage of the Compressor.

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