Most EPO “mushroom” buttons can be wired either NO or NC. -mel via cell
> On May 27, 2019, at 3:27 PM, Brian Kantor <br...@ampr.org> wrote: > > I was assuming the EPO trigger is a circuit that is normally OPEN > and is closed when the button is pushed. > > If instead, it is a normally-CLOSED circuit, then you are correct, > you would want two thermostats that both OPENED when the temperature > rose, which would typically be HEATING thermostats, not AIR CONDITIONING > thermostats. > > Either method could have been installed; in the computer room I > worked in, the EPO was a normally-open circuit that closed when you > hit any one of the buttons placed around the room and at the exits. > > Or indeed, if the fire suppression system triggered. > - Brian > >> On Mon, May 27, 2019 at 06:10:49PM -0400, Brandon Ross wrote: >>> On Mon, 27 May 2019, Brian Kantor wrote: >>> >>> A simple air conditioner thermostat wired to the EPO switch. >>> For safety, wire two thermostats in series so BOTH have to trip >>> before power is shut off. >> >> Admittedly it's been a long time since I worked with basic circuitry, but >> wouldn't wiring them in series cause the circuit to be interrupted if >> EITHER thermostat tripped? >> >> -- >> Brandon Ross Yahoo: BrandonNRoss >> Voice: +1-404-635-6667 ICQ: 2269442 >> Signal Secure SMS, Viber, Whatsapp: +1-404-644-9628 Skype: brandonross >> Schedule a meeting: http://www.doodle.com/bross
