Modular assembly for a refrigerant circuit of a motor vehicle, and refrigerant circuit

A module assembly for a refrigerant circuit of a motor vehicle, comprising:

• an inner heat exchanger, which is configured to transfer heat in a refrigerant configured to be compressed by operating a compressor of the refrigerant circuit, from a high-pressure side of the inner heat exchanger to a low-pressure side of the inner heat exchanger,
• a heat exchanger configured for flow of a coolant that is subjected to the refrigerant being configured to be supplied from the high pressure side of the inner heat exchanger to the heat exchanger and configured to be expanded by an expansion device of the module assembly, wherein the module assembly is formed separately from an evaporator of the refrigerant circuit and a condenser of the refrigerant circuit,
• a support device separate from the heat exchanger and on which the heat exchanger is held, wherein the support device is formed by the inner heat exchanger,
• at least one expansion valve that is configured, in a heating mode, to reduce a pressure of the refrigerant supplied to the condenser of the refrigerant circuit,
• the module assembly further comprising a collecting device which is configured to store refrigerant, wherein the collecting device is attached to the inner heat exchanger,
• wherein the heat exchanger is configured as a chiller, the chiller having a coolant side through which the coolant flows during operation of the chiller, wherein the chiller is supported by the inner heat exchanger,
• the module assembly further comprising a first check valve, wherein the first check valve is configured to prevent refrigerant from flowing back into the evaporator when refrigerant is extracted from the evaporator in a suction mode of the refrigerant circuit,
• the module assembly further comprising a second check valve, wherein the second check valve is configured to prevent refrigerant extracted from the condenser from being able to flow back into the condenser during a heat pump mode of the refrigerant circuit,
• the module assembly further comprising a shut-off valve, wherein the inner heat exchanger is configured to support the shut-off valve,
• the module assembly further comprising a further carrier part configured to attach the at least one expansion valve, wherein the further carrier part is arranged on the shut-off valve,
• and wherein the shut-off valve is configured, in the heating mode, to either:
• subject the condenser of the refrigerant circuit to refrigerant when closed, and
• subject the high-pressure side of the inner heat exchanger to refrigerant while bypassing the condenser of the refrigerant circuit when open.