Utilizes Digital expansion valve to precisely Regulate the movement of R290 refrigerant in the evaporator as well as a four-way valve to divert the refrigerant stream for the defrost Procedure Split Systems: Have one coil and fan inside and 1 exterior. Offer and return ducts connect to the indoor central https://bookmarkprobe.com/story20731134/new-step-by-step-map-for-r290-propane-heat-pump