Utilizes Digital expansion valve to precisely Handle the move of R290 refrigerant to the evaporator as well as a 4-way valve to divert the refrigerant circulation for the defrost Procedure Air source heat pumps glimpse much like air-conditioning units. Their dimensions depends on the amount heat they'll have to crank https://purethermal.co.uk/media-news/q4-launch-lithium-large-capacity-r290-ashp-from-pure-thermal-and-enerblue/