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Nest Thermostat + Baseboard Heaters

Hardware "Add-on" to the Nest Thermostat to take advantage of baseboard heaters.

j-pJ-P
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My house is equipped with a central bienergy furnace and a thermopump. Hydro-Quebec offers the "DT" rate, which in my case can be resume like that: 4.5¢/kWh if temperature is greater than -12°C and 24.5¢/kWh when temperature is lower than -12°C. In a perfect world, I would always use the thermopump until Hydro switch to the "Low Temp rate", and then switch to the oil furnace... The problem is my thermopump can't keep the house temperature below -5°C...
But hopefully, my house is also equipped with baseboard heaters which could be used between -5°C and -12°C.
Solution: Build a circuit that takes in input the signal from HQ (the -12° alarm) and the signal from the Nest to turn on the oil furnace, control a couple of solid state relays (one per heating circuit in my electrical panel) and eventually log everything and display on a web interface (the IoT is popular these days!)

I finally ended up with a design. I'm going to go for a small PCB that will mount directly to the solid state relay.

Circuit will feature a 3-input gate, inverters, protection diodes and voltage dividers.

Basically, there will be 3 inputs, and the board will be "hardware programmable" to activate the relay according to the inputs. Inputs will be for (1) the signal from HQ for low temp, (2) the signal from nest requesting heat and (3) from an optional microcontroller that could be connected to the cloud (though I'm not going to prioritize this feature for now).

IMG_20160119_112131[1].jpg

Schematic for relay board.

JPEG Image - 1.78 MB - 01/19/2016 at 16:23

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  • 6 × SSR-25DA Solid State Relay 3-32V DC Output 24-380VAC 25A
  • 1 × Electric Imp
  • 1 × Box To be determined

  • Nest is not a "smart" Thermostat

    J-P • 03/30/2016 at 17:14 • 0 comments

    Nest is not as smart as advertised, and I should not have bought. Here is why:

    1st : Nest doesn't know how much you pay for electricity/fuel...

    2nd : Nest almost emptied my fuel tank last fall : I add it filled in septemper and refilled in in January. With the old thermostat, a tank was enough for the whole year. The reason : when I used a schedule to lower the temp during the day, Nest Auto-Learning learned it was faster to reheat using the oil, even in the summer.

    I think I will rewire the furnace / thermopump so that Nest only tells to heat, and then my solution will deal with using the oil or the thermo pump or the baseboard heaters.

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