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UL 873
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UL 873 2012 Edition, January 6, 2012 UL Standard for Safety Temperature-Indicating and -Regulating Equipment
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Description / Abstract:
These requirements cover electrical equipment for control of
air-conditioning, heating, cooking, refrigeration, and humidity,
rated 600 volts or less, to be used in ordinary locations in
accordance with the National Electrical Code, NFPA 70.
These requirements cover general-use equipment for field-installation and controls intended to be factory installed on or in certain appliances as safety, limiting, or operating controls. These controls respond directly or indirectly to changes in temperature, humidity, or pressure to effect control of equipment or appliance operation. Devices covered by these requirements include:
a) Refrigeration Controllers – Humidistats for factory installation on or in refrigeration equipment; pressure, temperature, pneumatic pressure, motor, timer, bimetallic-heater, magnetically-operated controls, and the like, and combinations thereof in control panels with or without transformers. See 1.4.
b) Industrial Operating Controls – Temperature controllers for industrial, farm, and boiler room applications; snow melting controls; return-duct humidistats; humidity controllers; pneumatic pressure regulators; transformer (low-voltage secondary) relays; pneumatic pressure, bimetallicheater, motor, timer, and magnetically operated sequence switches; stoker controls; indicating and recording controls; and motor operators for actuating air dampers. These requirements do not cover output connected apparatus such as dampers, linkages, or valves.
c) Residential Operating Controls – Room thermostats, room humidistats, and other operating controls for residential heating and cooling appliances.
d) Controls for Factory Installation on or in Appliances –
1) Controls as mentioned in (a) – (c) but specifically intended for use on, in, or as a part of the end-use equipment.
2) Electric water-heater controls intended to regulate or limit water temperature.
3) Other controls including door-interlock thermostats for self-cleaning ovens; baseboard heater temperature-limiting controls; humidifier controls; fan thermostats; and temperature-regulating and -limiting thermostats for electric heating equipment such as clothes dryers, air heaters, household and commercial cooking appliances, beautyparlor equipment, steam and dry bath heaters, and ranges (controlling oven or surface elements).
Certain safety controls, and safety control circuits on operating controls, are investigated under the requirements in this standard, insofar as they apply, and also under the applicable requirements for limit controls.
These requirements cover general-use equipment for field-installation and controls intended to be factory installed on or in certain appliances as safety, limiting, or operating controls. These controls respond directly or indirectly to changes in temperature, humidity, or pressure to effect control of equipment or appliance operation. Devices covered by these requirements include:
a) Refrigeration Controllers – Humidistats for factory installation on or in refrigeration equipment; pressure, temperature, pneumatic pressure, motor, timer, bimetallic-heater, magnetically-operated controls, and the like, and combinations thereof in control panels with or without transformers. See 1.4.
b) Industrial Operating Controls – Temperature controllers for industrial, farm, and boiler room applications; snow melting controls; return-duct humidistats; humidity controllers; pneumatic pressure regulators; transformer (low-voltage secondary) relays; pneumatic pressure, bimetallicheater, motor, timer, and magnetically operated sequence switches; stoker controls; indicating and recording controls; and motor operators for actuating air dampers. These requirements do not cover output connected apparatus such as dampers, linkages, or valves.
c) Residential Operating Controls – Room thermostats, room humidistats, and other operating controls for residential heating and cooling appliances.
d) Controls for Factory Installation on or in Appliances –
1) Controls as mentioned in (a) – (c) but specifically intended for use on, in, or as a part of the end-use equipment.
2) Electric water-heater controls intended to regulate or limit water temperature.
3) Other controls including door-interlock thermostats for self-cleaning ovens; baseboard heater temperature-limiting controls; humidifier controls; fan thermostats; and temperature-regulating and -limiting thermostats for electric heating equipment such as clothes dryers, air heaters, household and commercial cooking appliances, beautyparlor equipment, steam and dry bath heaters, and ranges (controlling oven or surface elements).
Certain safety controls, and safety control circuits on operating controls, are investigated under the requirements in this standard, insofar as they apply, and also under the applicable requirements for limit controls.