Apparatus for refrigerating purposes; appliances, machines and installations for refrigerating, freezing and cooling; commercial refrigeration units; industrial refrigeration units; refrigerators; freezers; fridge-freezers; refrigerated cabinets, cold cabinets; refrigerated display units, refrigerated display cabinets; refrigerated sales display units including portable sales display units; refrigerated counters including refrigerated sales counters; refrigeration in the form of benches; refrigerated merchandising apparatus; refrigeration units for use in the hospitality industry; refrigeration units for use in the retail industry; parts and accessories therefor