“Refrigeration unit” means a mechanical unit that extracts heat from an area through liquefaction and evaporation of a fluid by a compressor, flame, or thermoelectric device, and includes a mechanical thermostatic control device that regulates refrigerated blown air into an enclosed area at or below the minimum required food storage temperature of potentially hazardous foods in conformance with Section 113996.
Source:
Section 113885, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=HSC§ionNum=113885..