UL Standard for Safety Temperature-Indicating and -Regulating Equipment
|Publication Date:||16 November 2007|
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,
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
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.