Hano hari ibintu bibiri mumasanduku yimodoka, kimwe nikigega gishyushye, kimwe nicyuma gikonjesha, amazi mumazi yimodoka arashyushye, gutembera mumatara ashyushye, umuyaga uhuhwa numufana numwuka ushyushye, kandi iyo ufunguye firigo, ikigega cyumuyaga gishyushye kizahagarika amazi, icyuma gikonjesha gitangira gukora ubukonje bwa firigo.
Isanduku yo guhinduranya ibinyabiziga ni moteri yimodoka hamwe nicyuma gikonjesha imashini. Imikorere yisanduku yo guhumeka yimodoka ikonjesha ni uguhindura firigo kuva mumazi ikajya kuri gaze (ni ukuvuga evaporation), ikurura ubushyuhe bwinshi hirya no hino, hanyuma ubushyuhe buke hamwe numwuka muke wa firigo muke muri compressor, hamwe nizunguruka ryibikorwa kugirango ugere kuntego yubushyuhe buke. Mu mpeshyi kugirango itange ahantu heza ho kugendera kubayirimo, gabanya imbaraga zumunaniro wumushoferi, guteza imbere umutekano wo gutwara
