Abstract: A process for conversion of a first refrigeration system including a first medium temperature circuit and a first low temperature circuit configured to circulate a synthetic refrigerant to a second refrigeration system includes replacing the first low temperature circuit with a second low temperature circuit by adding a heat exchanger to the first refrigeration system such that the second low temperature circuit is in a heat exchange relationship with the first medium temperature circuit, replacing a condenser of the first medium temperature circuit with a gas cooler, and connecting the second low temperature circuit to the first medium temperature circuit via pipe connections such that the low temperature compressor is fluidly connected to a medium temperature compressor of the first medium temperature circuit.