Takes advantage of electronic expansion valve to precisely Manage the movement of R290 refrigerant into the evaporator as well as a 4-way valve to divert the refrigerant flow for the defrost operation Break up Devices: Have just one coil and supporter inside and just one exterior. Provide and return ducts https://throbsocial.com/story22436755/5-tips-about-r290-air-source-heat-pump-you-can-use-today