Patent ID: 6968708

Claim:
A transcritical refrigeration system comprising: a compression device to compress a refrigerant to a high pressure; a heat rejecting heat exchanger for cooling said refrigerant; an expansion device for reducing said refrigerant to a low pressure; a heat accepting heat exchanger for evaporating said refrigerant, and an airflow exchanges heat with said refrigerant in said heat accepting heat exchanger; a variable speed device that moves said airflow at a variable airflow speed, and said variable speed device moves at a device speed; a drive that controls said device speed of said variable speed device; and a temperature sensor that senses an airflow temperature of said airflow, and said drive adjusts said variable speed device and said variable airflow speed of said airflow based on said airflow temperature, wherein said airflow is outdoor air and said variable speed device is deactivated prior to activating said compression device when said temperature sensor detects that said airflow temperature is above a threshold temperature.