UL 412
Standard for Refrigeration Unit Coolers

DETAILS
Edition Number:5SCC Approved:--
Edition Date:2011-08-22DOD Approved: 1992-04-09
Price Code:BANSI Approved: 2018-08-24
Type:ulstd

  • SCOPE

    1 Scope

    1.1 These requirements cover unit coolers intended for use in refrigerators, freezers, refrigerated warehouses, walk-in coolers, and the like. They are designed for connection to alternating current (ac) circuits rated not more than 600 volts.

    1.2 These requirements do not apply to fan-coil units intended for comfort cooling, heating, or both, or to other air-conditioning equipment or components covered by individual requirements.

    1.3 Requirements for installation of unit coolers are included in the National Electrical Code, NFPA 70, and the Safety Standard for Refrigeration Systems, ASHRAE Standard 15.

  • TABLE OF CONTENTS
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    • Cover
    • Transmittal
    • Table of Contents
      • Body
        • INTRODUCTION
          • 1 Scope
          • 2 General
            • 2.1 Units of measurement
            • 2.2 Undated reference
          • 3 Glossary
          • 4 Installation and Operating Instructions
        • CONSTRUCTION
          • 5 Components
          • 6 General
          • 7 Gaskets and Seals
          • 8 Nonmetallic Material Classification
          • 9 Nonmetallic Material – Ignition Source Separation
          • 10 Nonmetallic Material Application and Location
          • 11 Assembly
            • 11.1 Mechanical protection
            • 11.2 Protection from live parts
            • 11.3 Mounting of parts
          • 12 Accessories
          • 13 Cabinets and Enclosures
            • 13.1 General
            • 13.2 Doors and covers
          • 14 Barriers
          • 15 Field-Supply Connections
            • 15.1 General
            • 15.2 Terminals
            • 15.3 Leads
            • 15.4 Grounding
          • 16 Internal Wiring and Wiring Methods
          • 17 Separation of Circuits
          • 18 Bonding for Grounding
        • ELECTRICAL COMPONENTS
          • 19 Capacitors
          • 20 Current-Carrying Parts
          • 21 Electric Defrost Heaters
            • 21.1 Heater elements
            • 21.2 Heater temperature limiting control
          • 22 Insulating Material
          • 23 Motors
          • 24 Motor Overload Protection
            • 24.1 General
            • 24.2 Protection of single-phase motors
            • 24.3 Protection of three-phase motors
          • 25 Switches and Controllers
          • 25A Remotely Operated Unit Coolers
          • 26 Transformers
          • 27 Valves and Solenoids
          • 28 Circuit Breakers, Fusing Resistors and Supplementary Protectors
          • 29 Connectors, Receptacles and Terminals
          • 30 Electrical Cable, Conduit and Tubing
          • 31 Electrical Insulation Systems
          • 32 Electromagnetic Interference Filters
          • 33 Fuses and Fuseholders
          • 34 Lighting Systems
          • 35 Optical Isolators and Semiconductor Devices
          • 36 Outlet Boxes
          • 37 Power Supplies
          • 38 Terminal Blocks
          • 38A Information Technology Equipment
        • SPACINGS
          • 39 High-Voltage Circuits
          • 40 Extra-Low Voltage Circuits
          • 40A Alternate Spacings – Clearances and Creepage Distances
        • REFRIGERATION SYSTEM
          • 41 Refrigerant
          • 42 Refrigerant Tubing and Fittings
          • 43 Refrigerant-Containing Parts
          • 44 Required Discharge Capacity
          • 45 Relief Valves
          • 46 Fusible Plugs or Rupture Members
        • PERFORMANCE
          • 47 General
            • 47.1 Test voltage
            • 47.2 Temperature measurements
          • 48 Tests on Nonmetallic Materials
          • 49 Input Test
          • 50 Temperature Test – Cooling Mode
          • 51 Electrical Defrost Test
          • 52 Dielectric Voltage Withstand Test
          • 53 Evaporator Fan Motor Failure Test
          • 54 Overflow Test
          • 55 Static Loading Test
          • 56 Defrost Heater Control Tests
            • 56.1 Endurance test
            • 56.2 Calibration test
          • 57 Burnout Test
            • 57.1 Burnout defrost heater
            • 57.2 Other components
          • 58 Burnout Test – Impedance Protected Motors
            • 58.1 Nonmetallic materials evaluation
          • 59 Overvoltage and Undervoltage Tests
          • 60 Current Overload Test – Bonding Conductors and Connections
          • 60A Overload and Endurance Test – Switching Devices
          • 61A Switch Mode Power Supply Units – Overload Test
          • 61 Limited Short-Circuit Test
            • 61.1 General
            • 61.2 Motor overload protective devices
            • 61.3 Bonding conductors and connections
            • 61.4 Motor circuit conductors and connections
          • 62 Accelerated Aging Test – Electric Heaters
          • 63 Reliability Test – Heater Terminations
          • 64 Insulation Resistance Test
            • 64.1 Electric heaters
            • 64.2 Thermal and/or acoustical insulating material
          • 65 Strength Tests – Pressure Containing Components
          • 66 Rupture Member Test
          • 67 Fusible Plug Test
          • 68 Marking Label Adhesion Tests
          • 69 Fastener Strength Test
          • 70 Strain Relief Test
          • 70A Protective Electronic Circuit Tests
            • 70A.1 General
            • 70A.2 Fault Conditions Abnormal Test
            • 70A.3 Electromagnetic Compatibility (EMC) Tests
            • 70A.4 Programmable Component Reduced Supply Voltage Test
            • 70A.5 Fuse-Link Test
          • 70B Refrigerant Identification Tests
            • 70B.1 General
            • 70B.2 Infrared analysis
            • 70B.3 Gas chromatography analysis
        • MANUFACTURING AND PRODUCTION TESTS
          • 71 Pressure Test
          • 72 Production Line Dielectric Voltage Withstand Tests
          • 72A Protective Electronic Circuit Test
          • 72B Annual Refrigerant Identification
        • MARKING
          • 73 General
          • 74 Refrigerant Markings
          • 75 Electrical Markings
          • 76 Cautionary Markings
          • 77 Accessory Markings
    • Appendix A
    • APPENDIX B Normative