Expander control in hvacr systems

A heating, ventilation, air conditioning, and refrigeration (HVACR) system, comprising:

• a compressor having a suction port and a discharge port;
• a first expander configured to regulate working fluid flow;
• and
• a controller,
• wherein when the system transitions directly from a stop phase to a heating mode, the controller is configured to:
• determine a degree of opening of the first expander;
• when a duration of the stop phase is less than a first duration threshold, apply a first factor to the degree of opening of the first expander to configure the first expander;
• when the duration of the stop phase is not less than the first duration threshold and is less than a second duration threshold, apply a second factor to the degree of opening of the first expander to configure the first expander;
• and when the duration of the stop phase is not less than the second duration threshold, apply a third factor to the degree of opening of the first expander to configure the first expander;
• when a saturated suction temperature is less than a first temperature threshold, control the first expander based on a suction superheat.