On Wed, Nov 2, 2011 at 2:45 PM, Victor Soich <vso...@gmail.com> wrote:
> Hi, > > ... > I recently switched from oil heat to gas heat. I now have a fancy > shmantzy digital programmable thermostat. > It makes a popping and clicking sound whenever the heater changes > state. It also lights up whenever the heater > changes state. I don't want it to do these things. ... > I have a Honeywell (TH8000 series). It is a touch-screen LCD unit. The light comes on only when the screen is touched. It does click. The noise is from a reed relay. I can hear them from 15 feet away, but I would not call them loud. Perhaps if the unit were mounted with some form of sound isolation the wall would not be a sounding board. I doubt that you will find any units which use solid state relays, since historically the thermostat is a switch in the line which powers a valve or other relay. However, Honeywell now markets a system consisting of a "transmitter" at the thermostat and a "receiver" at the furnace ($). I assume that it uses digital signals. The relays are at the furnace. Its purpose it to control multiple functions (cooling, heating of multiple stages, etc.) over the traditional 3 wires. These might be silent. -Denis _______________________________________________ PLUG mailing list PLUG@lists.pdxlinux.org http://lists.pdxlinux.org/mailman/listinfo/plug