Employs Digital enlargement valve to exactly control the circulation of R290 refrigerant to the evaporator in addition to a four-way valve to divert the refrigerant movement for that defrost Procedure The refrigerant in an air-source heat pump absorbs heat within the outside air and turns right into a gasoline as https://purethermal.co.uk/media-news/q4-launch-lithium-large-capacity-r290-ashp-from-pure-thermal-and-enerblue/