A heating, ventilation, air conditioning, and refrigeration (HVACR) circuit, comprising: a compressor having a suction and a discharge; a first heat exchanger; an expander; a second heat exchanger; a suction line heat exchanger, configured to exchange heat between a first working fluid flow, wherein the first working fluid flow is a flow of working fluid from one of the first heat exchanger or the second heat exchanger to the suction of the compressor, and a second working fluid flow, wherein the second working fluid flow is a flow of working fluid from the other of the first heat exchanger or the second heat exchanger towards the expander; characterized in that the HVACR circuit further comprises: a flow director configured to regulate an amount of the second working fluid flow entering the suction line heat exchanger; a first temperature sensor located upstream of the suction line heat exchanger with respect to the first working fluid flow; a second temperature sensor located between the suction line heat exchanger and the suction of the compressor; and a controller, configured to: receive a first temperature of the first working fluid flow from the first temperature sensor; receive a second temperature of the first working fluid flow from the second temperature sensor; determine a superheat generation at the suction line heat exchanger based on the first temperature and the second temperature; and control the flow director based on the superheat generation and a threshold superheat value. a compressor having a suction and a discharge; a first heat exchanger; an expander; a second heat exchanger; a suction line heat exchanger, configured to exchange heat between a first working fluid flow, wherein the first working fluid flow is a flow of working fluid from one of the first heat exchanger or the second heat exchanger to the suction of the compressor, and a second working fluid flow, wherein the second working fluid flow is a flow of working fluid from the other of the first heat exchanger or the second heat exchanger towards the expander; characterized in that the HVACR circuit further comprises: a flow director configured to regulate an amount of the second working fluid flow entering the suction line heat exchanger; a first temperature sensor located upstream of the suction line heat exchanger with respect to the first working fluid flow; a second temperature sensor located between the suction line heat exchanger and the suction of the compressor; and a controller, configured to: receive a first temperature of the first working fluid flow from the first temperature sensor; receive a second temperature of the first working fluid flow from the second temperature sensor; determine a superheat generation at the suction line heat exchanger based on the first temperature and the second temperature; and control the flow director based on the superheat generation and a threshold superheat value. a flow director configured to regulate an amount of the second working fluid flow entering the suction line heat exchanger; a first temperature sensor located upstream of the suction line heat exchanger with respect to the first working fluid flow; a second temperature sensor located between the suction line heat exchanger and the suction of the compressor; and a controller, configured to: receive a first temperature of the first working fluid flow from the first temperature sensor; receive a second temperature of the first working fluid flow from the second temperature sensor; determine a superheat generation at the suction line heat exchanger based on the first temperature and the second temperature; and control the flow director based on the superheat generation and a threshold superheat value. receive a first temperature of the first working fluid flow from the first temperature sensor; receive a second temperature of the first working fluid flow from the second temperature sensor; determine a superheat generation at the suction line heat exchanger based on the first temperature and the second temperature; and control the flow director based on the superheat generation and a threshold superheat value.