Description

UL 353 – Limit Controls

Please note: All interim revisions for this edition available at time of your purchase will be included.

These requirements cover limit controls, furnace fan controls, and other interlocks which are essentially switches responding to changes in liquid level, pressure,or temperature. Although not limited to such specific applications, these safety controls include those intended primarily to safeguard heating appliances, heatingsystems, processing systems, and air-conditioning and ventilating systems.