Water heater circuit for defrosting a refrigerator, has high temperature coolant not fed through high pressure heat exchanger if low pressure heat exchanger ices up

摘要

The water heater circuit has a compressor (10) for compressing a coolant fluid and a high pressure heat exchanger (20) for cooling the high pressure coolant. There is a low pressure heat exchanger (40) for vaporizing the coolant as it is expanded. A gas-fluid separator (50) for the coolant has a gaseous coolant outlet for connection to the compressor inlet. If the low pressure heat exchanger is iced up, the high temperature coolant is not fed through the high pressure heat exchanger for cooling.