Method of operating a refrigeration cycle apparatus

A method of operating a refrigeration cycle apparatus, wherein a coolant is compressed by a compressor (1), wherein the compressed coolant is fed to a condenser (2) for release of heat, wherein coolant condensed in the condenser (2) is later fed to a primary side (3.1) of an internal heat exchanger (3) for release of heat, wherein the coolant cooled down on the primary side (3.1) of the internal heat exchanger (3) is guided through a first expansion valve (4), wherein the coolant expanded in the first expansion valve (4) is fed to an evaporator (5) for absorption of heat, wherein the coolant evaporated in the evaporator (5) is later fed to a secondary side (3.2) of the internal heat exchanger (3) for absorption of heat, wherein the coolant heated on the secondary side (3.2) of the internal heat exchanger (3) is fed to the compressor (1),

• wherein,
• for suction gas temperature control, an amount of heat transferred from the primary side (3.1) to the secondary side (3.2) of the internal heat exchanger (3) is controlled with the aid of a second expansion valve (6) arranged parallel to the internal heat exchanger (3) in a bypass around the internal heat exchanger (3) and the first expansion valve (4) and between the condenser (2) and the evaporator (5).