UL 621 PDF

1 Scope

1.1 These requirements cover unitary ice cream makers intended for commercial (not household) use and designed for connection to alternating current circuits rated not more than 600 voltsV. For the purposes of this standard, ice cream makers include equipment for preparing products such as hard ice cream, soft serve ice cream, milk shakes, and sherbets and may include means for dispensing the product directly into containers.

NOTE: Household ice cream makers, which could include those used in the following environments are covered by UL 60335-2-24:

1. a) Staff kitchen areas in shops, offices, and other working environments;
2. b) Use by clients in hotels, motels, bed/breakfast, and other residential environments; and
3. c) In catering and similar non-retail applications.

1.2 Ice cream makers covered by these requirements employ sealed (hermetic type) motor compressors and air-cooled or water-cooled condensers, and may also employ flammable refrigerant as specified in Supplement SB.

1.3 These ice cream makers are intended to be installed in accordance with the National Electrical Code, NFPA 70, and the Safety Standard for Refrigeration Systems, ASHRAE 15.

SUMMARY OF TOPICS

This revision to ANSI/UL 621 dated November 14, 2024 includes the following changes in requirements:

– Addition of Requirements for Use of Flammable Refrigerants; 1.2, 3.8A, 3.8B, Table 17.5, 32.1, 32.2, 37.1.1, Supplement SB

– Revision to Update and Clarify the Scope; 1.1

– Maximum Operating Current and Maximum Rated Current Requirements; 3.2A, 3.2B, 3.5A, 3.5B, 11.1.2, 17.6, 17.7, 17.14, 17.15, 19.2.1, Table 19.1, 19.4.1 – 19.4.3, 50.3, 68.2, 68.7, 68.9 – 68.11A