Ukukhuselwa komthwalo ogqithisileyo kwiiyunithi zokupholisa amanzi ngumlinganiselo obalulekileyo wokhuseleko. Iindlela eziphambili zokujongana nomthwalo ogqithisiweyo kwii-chillers zamanzi zibandakanya: ukujonga isimo somthwalo, ukuhlola i-motor kunye ne-compressor, ukujonga i-refrigerant, ukulungelelanisa iiparitha zokusebenza, kunye nokunxibelelana nabasebenzi njengeqela emva kokuthengisa kwi-chiller factory.