Nowhere in refrigeration has change taken place faster in terms of system design and refrigerants than in the supermarket sector. Familiar rack DX systems are just one part of the equation with distributed and secondary loop also gaining attention. Refrigerants have gone from CFCs like R-502 to the HCFC R-22 to a whole range of HFCs as well as ‘naturals’ like HCs and CO2.
But through it all, those who design, install, service, and maintain such changing technologies still need to understand how these systems’ components operate across the technology spectrum and how to do proper maintenance including leak repair regardless of the refrigerant.