The Fenwal 01-017002-000 Thermoswitch Temperature Control is a critical device designed to properly regulate temperatures between -100 and 400 degrees Fahrenheit. This thermoswitch, which is mostly used in HVAC systems, functions by sensing temperature variations within its designated range and triggering the necessary operations to maintain the required temperature. #Fenwal #01-01... https://www.partshnc.com/01-017002-000-fenwal-thermoswitchtempctrl-100-400f