Ma valve owonjezera a Thermostatic amawongolera jakisoni wamadzimadzi a refrigerant mu evaporator.Jekeseni amayendetsedwa ndi refrigerant superheat.
Choncho mavavu ndi oyenera kubayidwa madzi mu evaporators "zouma" kumene kutentha kwakukulu kwa evaporator kumayenderana ndi katundu wa evaporator.