How should evaporating temperature be selected for a commercial cold-room refrigeration unit?

Select evaporating temperature from room temperature, heat load, and heat-exchanger conditions rather than simply choosing the lowest value. The purchase decision should use the actual recipe, load, and duty cycle rather than a catalogue maximum. At acceptance, repeat the agreed test with production-equivalent material and compare the result with the contractual tolerance. These records make the technical promise measurable and reduce disagreement when the machine arrives at the buyer’s site. For repeat orders, preserve the approved configuration so a later machine is built to the same practical performance basis and documented settings.