Breadcrumb Home HART Heating, Air Conditioning and Refrigeration (N) HART-2342 HART-2342: Commercial Refrigeration Download Catalog PDF Download Page PDF Program HART Heating, Air Conditioning and Refrigeration (N) Lecture Hours 2 Lab Hours 4 Credit Hours 3 Course Type N Theory and practical application in the maintenance of commercial refrigeration; medium and low temperature applications and ice machines.Prerequisites: HART-1401, HART-1407.