A relay is just a switch. The purpose of any switch is to turn something on and off. A relay turns HVAC equipment on or off. It’s that easy. A thermostat is also just a switch that turns HVAC ...
Last column, I wrote about various applications where fire alarm relays could be used to integrate a commercial fire alarm system with other electrical systems at a customer’s site to provide them ...
Some results have been hidden because they may be inaccessible to you
Show inaccessible results