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Method of operating a transport refrigeration unit

  • US 5,201,185 A
  • Filed: 07/11/1991
  • Issued: 04/13/1993
  • Est. Priority Date: 07/11/1991
  • Status: Expired due to Term
First Claim
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1. A method of defrosting an evaporator coil of a transport refrigeration unit having a refrigerant circuit which includes a compressor and an evaporator coil having a coil temperature sensor, and microprocessor based electrical control for controlling the temperature of a served space by drawing air from the served space, conditioning the air with the evaporator coil, and returning the conditioned air to the served space, comprising the steps of:

  • requesting a manual defrost operation,determining whether the evaporator coil temperature sensor is functional, or faulty,overriding the request for the manual defrost operation when the determining step finds the evaporator coil temperature sensor is faulty,determining if the compressor of the transport refrigeration unit is running,determining if the transport refrigeration unit is set to operate in a cycling mode when the compressor is not running,and overriding the request for the manual defrost operation when the compressor is not running and the transport refrigeration unit is not set to operate in a cycling mode.

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