An haɗa fam ɗin injin da aka haɗa tare da bututun tsarin refrigeration (yawanci babban gefen matsa lamba yana haɗawa a lokaci guda) don cire iskar gas da ruwa mara ƙarfi a cikin bututun tsarin.

Nau'in:

① HMI tsarin injin motsi

② Tsarin injin motsi mai motsi na dijital

③ Tsarin iska mai aiki