Ama-valve okwandisa i-Thermostatic alawula umjovo woketshezi oluyisiqandisi ku-evaporator.Umjovo ulawulwa ukushisa okuphezulu kwesiqandisi.
Ngakho-ke ama-valve afaneleka ngokukhethekile umjovo owuketshezi kuma-evaporator “ezomile” lapho ukushisa okuphezulu endaweni yokukhishwa kwe-evaporator kuhambisana nomthwalo we-evaporator.