UL 621
Standard for Ice Cream Makers

DETAILS
Edition Number:7SCC Approved:--
Edition Date:2010-05-07DOD Approved: 1992-02-25
Price Code:CANSI Approved: 2017-02-15
Type:ulstd

  • SCOPE

    1 Scope

    1.1 These requirements cover unitary ice cream makers designed for connection to alternating current circuits rated not more than 600 volts. 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.

    1.2 Ice cream makers covered by these requirements employ sealed (hermetic type) motor compressors and air-cooled or water-cooled condensers.

    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.

  • TABLE OF CONTENTS
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    • Cover
    • Transmittal
    • Table of Contents
      • Body
        • INTRODUCTION
          • 1 Scope
          • 2 General
            • 2.1 Terminology
            • 2.2 Components
            • 2.3 Units of measurement
            • 2.4 Undated references
          • 3 Glossary
          • 3A Definitions Relating To Classes Of Control Functions
        • CONSTRUCTION
          • 4 General
          • 5 Assembly
            • 5.1 General
            • 5.2 Pressurized product system
            • 5.3 Mechanical protection
          • 6 Accessibility Of Uninsulated Live Parts, Film-Coated Wire, Moving And Hot Parts
          • 7 Accessories
          • 8 Enclosures
            • 8.1 General
            • 8.2 Doors and covers
          • 9 Nonmetallic Materials
            • 9.1 General
            • 9.2 Classification
            • 9.3 Application
          • 10 Field Supply Connections
            • 10.1 General
            • 10.2 Permanently connected ice cream makers
            • 10.3 Terminals and leads
            • 10.4 Cord-connected ice cream makers
          • 11 Internal Wiring And Wiring Methods
            • 11.1 General
            • 11.2 High voltage circuits
            • 11.3 Low voltage circuits
            • 11.4 Wiring method
            • 11.5 Short circuit protection
          • 12 Secondary Circuits
            • 12.1 General
            • 12.2 Class 2 circuits
            • 12.3 Limited voltage/current circuits
          • 13 Separation Of Circuits
          • 14 Bonding For Grounding
        • ELECTRICAL COMPONENTS
          • 15 Current-Carrying Parts
          • 16 Insulating Material
          • 17 Switches and Controllers
          • 18 Motors And Motor Overload Protection
          • 19 Motors
            • 19.1 General
            • 19.2 Protection of single-phase nonhermetic motors
            • 19.3 Protection of three-phase motors
            • 19.4 Protection of hermetic refrigerant motor-compressors
          • 20 Fuseholders
          • 20A Fuses, Circuit Breakers, and Supplementary Protectors
          • 21 Incandescent Lighting Systems
          • 22 Receptacles
          • 23 Receptacle And Lighting Circuit Overcurrent Protection
          • 24 Lampholders
          • 25 Valves And Solenoids
          • 26 Capacitors
          • 26A Outlet Boxes, Electrical Cable, Conduit and Tubing
          • 26B Electromagnetic Interference Filters
          • 26C Relays and Contactors
          • 26D Optical Isolators and Semiconductor Devices
          • 26E Terminal Blocks
          • 26F Printed-Wiring Boards
          • 27 Transformer Protection
            • 27.1 High-voltage transformers
            • 27.2 Overcurrent protective devices
          • 28 High-Voltage Control Circuit Conductor Overcurrent Protection
            • 28.1 General
            • 28.2 Direct-connected, high-voltage control circuits
            • 28.3 Tapped high-voltage control circuits
            • 28.4 Overcurrent protective devices
        • SPACINGS
          • 29 High-Voltage Circuits
          • 30 Low-Voltage Circuits
          • 31 Alternate Spacings – Clearances and Creepage Distances
        • REFRIGERATION SYSTEM
          • 32 Refrigerant
          • 33 Pumpdown Capacity
          • 34 Refrigerant Tubing And Fittings
          • 35 Refrigerant-Containing Parts
          • 36 Pressure-Limiting Devices
          • 37 Pressure Relief
            • 37.1 General
            • 37.2 Relief valves
            • 37.3 Fusible plugs or rupture members
        • PERFORMANCE
          • 38 Instrumentation
            • 38.1 Temperature measurements
            • 38.2 Pressure measurements
          • 39 Test Voltage
          • 40 Leakage Current Test – Cord-Connected Ice Cream Makers
          • 41 Input Test
          • 42 Starting Test
          • 43 Temperature And Pressure Test
          • 44 Dielectric Voltage-Withstand Test
          • 45 Condenser Fan Motor Failure Test
          • 46 Condenser Water Failure Test
          • 47 Overflow Test
          • 48 Stability Test
          • 49 Burnout Tests – Components
          • 50 Burnout Test – High-Voltage Transformers
          • 51 Overload Test – High-Voltage Transformers
          • 52 Overvoltage And Undervoltage Tests
          • 53 Current Overload Test – Bonding Conductors and Connections
          • 54 Insulation Resistance Test
          • 55 Limited Short-Circuit Test
            • 55.1 General
            • 55.2 Motor overload protective devices
            • 55.3 Bonding conductors and connections
            • 55.4 Motor circuit conductors and connections
          • 56 Compressor Protective Device Tests
          • 57 Strength Tests – Pressure Containing Components
            • 57.1 Refrigeration system
          • 58 Start-To-Discharge Test
          • 59 Component Restraint Test
          • 60 Fastener Strength Test
          • 61 Burnout Test – Impedance Protected Motors
          • 62 Tests on Nonmetallic Materials
          • 63 Strain Relief Test
          • 63A Component Failure Test
        • MANUFACTURING AND PRODUCTION TESTS
          • 64 Pressure Tests
          • 65 Production-Line Dielectric Voltage-Withstand Tests
          • 66 Production-Line Grounding Continuity Tests
        • MARKING
          • 67 General
          • 68 Permanently Connected Ice Cream Makers
          • 69 Cord-Connected Ice Cream Makers
        • INSTRUCTIONS
          • 70 Installation and Operating Instructions
    • UL 60335-1 BASED REQUIREMENTS FOR THE EVALUATION OF ELECTRONIC CIRCUITS