mramos1
Active Member
We have a couple AC units that run all the time (in a commercial building).
The thermostats are near the heat pumps (where the AC people say they should be) but that same area has an electrical room. The transformers in the electrical room seem to heat the area so the AC never cuts off. And the hallways are always too cold and costing money.
My thought was to make a board with a thermistor/pot/voltage divider via op-amp to power a transistor and relay to put in the hallway. The relay would open and close the thermal metal switch in the thermostat. Basically it will open and close the always closed switch as it seem to never open up. A remote thermostat to control the real one. I priced doing it the right way and it was a bit high.
Anyone have any thoughts. A better way, will there be a debounce type issue with the thermistor and pot that will bias the voltage divider on the op-amp. Do not want the relay to oscillate.
Using a uC would be my way out, but then I have to drop the 24vac to 5vdc and cost goes up. Also coding time. But not opposed to it.
The thermostats are near the heat pumps (where the AC people say they should be) but that same area has an electrical room. The transformers in the electrical room seem to heat the area so the AC never cuts off. And the hallways are always too cold and costing money.
My thought was to make a board with a thermistor/pot/voltage divider via op-amp to power a transistor and relay to put in the hallway. The relay would open and close the thermal metal switch in the thermostat. Basically it will open and close the always closed switch as it seem to never open up. A remote thermostat to control the real one. I priced doing it the right way and it was a bit high.
Anyone have any thoughts. A better way, will there be a debounce type issue with the thermistor and pot that will bias the voltage divider on the op-amp. Do not want the relay to oscillate.
Using a uC would be my way out, but then I have to drop the 24vac to 5vdc and cost goes up. Also coding time. But not opposed to it.