Kamar sauran kayan aikin masana'antu, mai sanyaya ruwa shima yana buƙatar aiki a cikin yanayin aiki mai dacewa. Kuma ta wurin aiki, yanayin zafin jiki shine maɓalli mai mahimmanci. Kamar yadda kowa ya sani, lokacin da yanayin yanayi ya ragu zuwa ko ƙasa da digiri 0, ruwa zai zama daskarewa. Amma wannan ba yana nufin yanayin zafin ruwa ya fi girma ba, saboda tsarin yana buƙatar zafin jiki daban-daban. Idan zafin ruwa ya yi yawa, za a kunna ƙararrawar zafin ruwa mai ɗorewa. Don haka menene matsakaicin zafin jiki na mahalli na chiller?
To, ya bambanta daga nau'ikan chiller daban-daban. Don m sanyaya ruwa mai sanyaya CW-3000, da max. zazzabi na mahalli na chiller shine digiri 60 C. Duk da haka, dangane da aikin sanyaya ruwa na masana'antu (watau tushen firiji), max. Yanayin zafin jiki na chiller zai zama digiri 45.
