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  2. Thermal cutoff - Wikipedia

    en.wikipedia.org/wiki/Thermal_cutoff

    A thermal switch (sometimes thermal reset or thermal cutout (TCO)) is a device which normally opens at a high temperature (often with a faint "plink" sound) and re-closes when the temperature drops. The thermal switch may be a bimetallic strip, often encased in a tubular glass bulb to protect it from dust or short circuit. Another common design ...

  3. Utilization categories - Wikipedia

    en.wikipedia.org/wiki/Utilization_categories

    Control of a hermetically sealed refrigeration compressor motor with automatic reset of overload releases: 8-hour operation with starting currents for starting, maneuvering, operation 60947-4-2 AC-58b The control of a hermetically sealed refrigeration compressor motor with automatic reset of the overload trips: Intermittent operation 60947-4-2

  4. Environmental control system - Wikipedia

    en.wikipedia.org/wiki/Environmental_control_system

    There are many various types of CAUs; however, they all use typical fundamentals. The bleed air enters the primary ram-air heat exchanger, where it is cooled by either ram air, expansion or a combination of both. The cold air then enters the compressor, where it is repressurized, which reheats the air.

  5. Freeze stat - Wikipedia

    en.wikipedia.org/wiki/Freeze_stat

    Air coil freeze stat. A freeze stat is a temperature sensing device for HVAC that monitors a heat exchanger to prevent its coils from freezing.Freeze stats can be used on both refrigerant-to-air, and refrigerant-to-liquid type heat exchangers and serve different purposes with similar goals for each.

  6. Pressure switch - Wikipedia

    en.wikipedia.org/wiki/Pressure_switch

    A pressure switch is a form of switch that operates an electrical contact when a certain set fluid pressure has been reached on its input. The switch may be designed to make contact either on pressure rise or on pressure fall. Pressure switches are widely used in industry to automatically supervise and control systems that use pressurized fluids.

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