Method and system for controlling a condensing unit

A method for controlling operation of a condensing unit, the method comprising:

• verifying by a controller of the condensing unit whether the condensing unit is in one of the following modes:
• a Cool mode, a System off mode, or a Compressor off mode;
• and
• if the condensing unit is in Cool mode, initiating by the controller a Low Pressure Cut Out in Low Ambient Start Function (LPCOLASF) Cool mode module;
• if the condensing unit is in System Off mode, initiating by the controller a Low Pressure Cut Out in Low Ambient Start Function (LPCOLASF) System Off mode module;
• and
• if the condensing unit is in Compressor off mode, initiating by the controller a Low Pressure Cut Out in Low Ambient Start Function (LPCOLASF) Compressor off mode module.

A system for controlling operation of a condensing unit in low ambient temperature conditions, the system comprising:

• an input port for receiving a current suction pressure value at an input of a compressor of the condensing unit;
• a controller for:
• verifying if a suction pressure of the compressor of the condensing unit is below a Low Ambient Safety Pressure (LASP) value, and if the suction pressure is below the LASP, executing a below LASP sub-module;
• and
• verifying whether the suction pressure of the compressor of the condensing unit is above the LASP but below a Low Pressure Cut Out (LPCO), and if the suction pressure is above the LASP and below the LPCO, executing a below LPCO sub-module.

A system for controlling operation of a condensing unit, the system comprising:

• an input port for receiving a current suction pressure value at an input of a compressor of the condensing unit;
• a controller for:
• verifying if the condensing unit is in a Cool mode, and if the condensing unit is in Cool mode:
• verifying if a suction pressure of the compressor of the condensing unit is below a Low Ambient Safety Pressure (LASP) value, and if the suction pressure is below the LASP, executing a below LASP sub-module;
• and
• verifying whether the suction pressure of the compressor of the condensing unit is above the LASP but below a Low Pressure Cut Out (LPCO), and if the suction pressure is above the LASP and below the LPCO, executing a below LPCO sub-module.