Standard 32.1 specifies methods of testing for rating the capacity and efficiency of self-contained, mechanically refrigerated vending machines for sealed beverages.

Changes in the 2017 edition include:

• Updated scope and definitions to emphasize intended application to refrigerated beverage vending machines and combination machines
• Removal of distinctions between zone-cooled and fully cooled machines
• Updated references
• Enhanced instrumentation calibration and accuracy requirements
• Removal of the 90°F (32.2°C) ambient condition for the energy consumption test and designation of the 75°F (23.9°C) ambient condition as the singular test condition
• Clarification of test setup requirements, including ambient temperature measurement location, beverage temperature locations, test package construction, and sensor wire installation
• Incorporation of minimum functionality requirements that must be included and the controls that are permitted in the vending machine under test
• Clarification of the method for calculating integrated average temperature