High outdoor ambient and high suction pressure oil pump out mitigation for air conditioners

A controller of an air conditioning system comprising:

• a processor;
• a memory comprising computer-executable instructions that, when executed by the processor, cause the processor to perform operations, the operations comprising:
• operating a refrigerant compressor at a demand speed to circulate refrigerant through a refrigeration circuit;
• monitoring a temperature of external ambient air;
• monitoring a pressure of the refrigerant within the refrigerant circuit;
• detecting when the temperature of external ambient air is greater than a selected temperature;
• detecting when the pressure of the refrigerant is greater than a selected pressure, wherein the pressure is suction pressure of the refrigerant flowing into the refrigerant compressor;
• and
• reducing the speed of the refrigerant compressor to a selected speed for a first duration of time when the temperature of external ambient air is greater than the selected temperature and the pressure of the refrigerant is greater than the selected pressure.

An air conditioning system comprising:

• a refrigerant compressor comprising a refrigerant compressor inlet, the refrigerant compressor in fluid communication with a refrigerant heat rejection heat exchanger, an expansion device, and a refrigerant heat absorption heat exchanger to form a refrigerant circuit;
• wherein the refrigerant compressor is configured to operate at a demand speed to circulate a refrigerant through the refrigerant circuit when operating in a cooling mode;
• a controller operably coupled to the refrigerant compressor;
• a temperature sensor operably coupled to the controller, the temperature sensor configured to measure an external ambient air temperature;
• and
• a pressure sensor disposed on the refrigerant circuit, the pressure sensor configured to measure a refrigerant pressure, wherein the refrigerant pressure is suction pressure of the refrigerant flowing into the refrigerant compressor;
• wherein the controller is configured to reduce the speed of the refrigerant compressor to a selected speed for a first duration of time when the external ambient air temperature is greater than a selected temperature and the refrigerant pressure is greater than a selected pressure.