Uses electronic growth valve to exactly Management the stream of R290 refrigerant into your evaporator as well as a four-way valve to divert the refrigerant stream for the defrost Procedure Working with electrical energy, the pump compresses the liquid to extend its temperature. It then condenses back into a liquid https://purethermal.co.uk/media-news/q4-launch-lithium-large-capacity-r290-ashp-from-pure-thermal-and-enerblue/