UL 484
Standard for Room Air Conditioners

DETAILS
Edition Number:9SCC Approved:--
Edition Date:2014-02-07DOD Approved: 1993-02-05
Price Code:AANSI Approved: 2016-10-25
Type:ulstd

  • SCOPE

    1 Scope

    1.1 These requirements cover room air conditioners rated not more than 600 volts alternating current (ac) and intended for installation in accordance with the National Electrical Code, ANSI/NFPA 70.

    1.2 For the purposes of this standard, room air conditioners include packaged terminal air conditioners, special purpose air conditioners, and recreational vehicle air conditioners. They are factory-made encased assemblies designed as a unit primarily to provide free delivery of conditioned air to an enclosed space, room, or zone. This equipment is intended for installation in a window, through a wall, or as a console located in or adjacent to the room, zone, or space to be conditioned. These units employ hermetic refrigerant motor-compressors with factory-charged refrigeration systems and include means for circulating air. They may also have provision for heating and ventilation.

    1.3 With regard to 1.2, a console or in-wall type air conditioner may additionally serve a single adjacent room. Such units employ cabinet or enclosure constructions permitting attachment of an air discharge adapter or duct which extends into the adjacent room. Recreational vehicle air conditioners may also employ a limited amount of ductwork.

    1.4 These requirements do not cover equipment intended for connection to duct systems for the purpose of providing central cooling, heating, or both.

  • 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 Terminology
            • 2.3 Undated references
          • 3 Glossary
        • CONSTRUCTION
          • 4 General
          • 5 Assembly
          • 6 Accessories
          • 7 Enclosures
            • 7.1 General
            • 7.2 Enclosures exposed to weather
          • 8 Polymeric Materials
            • 8.1 General
            • 8.2 Material classification
            • 8.3 Ignition sources
            • 8.4 Material application
          • 9 Mounting Hardware
          • 10 Field Supply Connections
            • 10.1 Permanently-connected units
            • 10.2 Cord-connected units
            • 10.3 Grounding
          • 11 Internal Wiring
            • 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
          • 15 Thermal Aisle Containment Systems
            • 15.1 General
            • 15.2 Equipment employing drop-out ceilings used beneath automatic sprinklers
        • ELECTRICAL COMPONENTS
          • 16 Capacitors
          • 17 Current-Carrying Parts
          • 18 Electric Air Heaters
            • 18.1 Heater elements
            • 18.2 Heater overtemperature control
            • 18.3 Heater overcurrent protection
          • 19 Fuseholders and Circuit Breakers
            • 19.1 Fuseholders
            • 19.2 Circuit breakers
          • 20 Fuses and Supplementary Protectors
          • 21 Insulating Material
          • 22 Motors
          • 23 Motor Protection
            • 23.1 General
            • 23.2 Protection of single-phase nonhermetic motors
            • 23.3 Protection of three-phase motors
            • 23.4 Protection of hermetic refrigerant motor-compressors
          • 24 Switches and Controllers
          • 25 Valves and Solenoids
          • 26 Outlet Boxes, Electrical Cable, Conduit and Tubing
          • 27 Electromagnetic Interference Filters
          • 28 Relays and Contactors
          • 29 Optical Isolators and Semiconductor Devices
          • 30 Terminal Blocks
          • 31 Transformer Protection
            • 31.1 High-voltage transformer
            • 31.2 Overcurrent protective device
          • 32 High-Voltage Control Circuit Conductor Overcurrent Protection
            • 32.1 General
            • 32.2 Direct-connected high-voltage control circuit
            • 32.3 Tapped high-voltage control circuit
            • 32.4 Overcurrent protective device
          • 32A Button or Coin Cell Batteries of Lithium Technologies
        • ELECTRICAL SPACINGS
          • 33 High-Voltage Circuits
          • 34 Low-Voltage Circuits
          • 35 Alternate Spacings – Clearances and Creepage Distances
        • REFRIGERATION SYSTEM
          • 36 Refrigerant
          • 37 Pump-Down Capacity
          • 38 Refrigerant Tubing and Fittings
          • 39 Refrigerant-Containing Parts
          • 40 Pressure-Limiting Device
          • 41 Pressure Relief
            • 41.1 General
            • 41.2 Relief valves
            • 41.3 Fusible plugs or rupture members
        • PERFORMANCE
          • 42 Instrumentation
            • 42.1 Temperature measurements
            • 42.2 Pressure measurements
          • 43 Test Voltage
          • 44 Leakage Current Test – Cord-Connected Room Air Conditioners
          • 45 Rain Test
          • 46 Test Conditions for Input Test and Temperature-Pressure Test
          • 47 Input Test
            • 47.1 General
            • 47.2 Cooling load
            • 47.3 Heating load (reverse cycle heat only)
            • 47.4 Heating load (resistance heat only)
            • 47.5 Heating load (combination reverse cycle and resistance heat)
          • 48 Temperature and Pressure Test
          • 49 Starting Test
          • 50 Dielectric Voltage-Withstand Test
          • 51 Condenser Fan Motor Failure Test
          • 52 Condenser Water Failure Test
          • 53 Temperature Test – Steam Or Hot Water Heat
          • 54 Temperature Test – Resistance Heat
          • 55 Abnormal Tests – Resistance Heat
            • 55.1 General
            • 55.2 Blocked outlet
            • 55.3 Restricted inlet
            • 55.4 Fan Failure
          • 56 Static Loading Test
          • 57 Stability Test
          • 58 Overflow Test
          • 59 Spillage Test
          • 60 Heater Temperature-Limiting Control Tests
            • 60.1 Endurance test
            • 60.2 Calibration test
          • 61 Maximum Continuous Current Test– Motor-Compressor Protection Devices
          • 62 Limited Short-Circuit Test
            • 62.1 General
            • 62.2 Motor overload protective devices
            • 62.3 Bonding conductors and connections
            • 62.4 Motor circuit conductors and connections
          • 63 Current Overload Test – Bonding Conductors and Connections
          • 64 Overvoltage and Undervoltage Tests
          • 65 Insulation Resistance Test
            • 65.1 Sheath-type heaters
            • 65.2 Thermal and acoustical insulation material
          • 66 Accelerated Aging Test – Electric Heaters
          • 67 Reliability Test – Heater Terminations
          • 68 Accelerated Aging Tests On Gaskets Sealing Compounds, And Adhesives
          • 69 Metallic Coating Thickness Test
          • 70 Strength Tests – Pressure Containing Components
          • 71 Fatigue Test Analysis
            • 71.1 General
            • 71.2 Test specifications
            • 71.3 Material specifications
            • 71.4 General test specifications
            • 71.5 Test method
            • 71.6 Test parameters
            • 71.7 Cycle test pressure specification
          • 72 Strain Relief Test
          • 73 Burnout Tests – Electromagnetic Components
        • POLYMERIC MATERIALS – PERFORMANCE
          • 74 Heat Deflection or Mold Stress-Relief Test
          • 75 Water Absorption Test
          • 76 Environmental Exposure
            • 76.1 Air oven aging
            • 76.2 Ultraviolet light and water exposure
            • 76.3 Water immersion
          • 77 Tensile Strength Test
          • 78 Flexural Strength Test
          • 79 Izod Impact Test
          • 80 Burnout Test – High-Voltage Transformers
          • 81 Overload Test – High-Voltage Transformers
          • 82 Tensile Impact Test
          • 83 Impact Test
          • 84 Volume Resistivity Test
        • MANUFACTURING AND PRODUCTION TESTS
          • 85 Pressure Tests
          • 86 Production Line Dielectric Voltage-Withstand Test
          • 87 Production Line Grounding Continuity Test
        • MARKING
          • 88 General
          • 89 Permanently-Connected Units
          • 90 Cord-Connected Units
        • INSTRUCTIONS
          • 91 Installation and Operating Instructions
    • ALTERNATIVE PATH FOR ELECTRONIC CONTROLS REQUIREMENTS
    • Appendix A(normative)Selected information about refrigerants
    • Appendix B(informative)Transportation, marking and storage for units that employ flammable refrigerants
    • Appendix C(normative)Manuals
    • Appendix D(normative)Leak simulation tests
    • Appendix E(normative)Charge limits and additional test requirements for appliances using flammable refrigerants