I am new to the community! Excited to build my first project!!
I need help or guidance with the HW side of things.
I have radiant in-floor heat installed throughout my house. There is a thermostat in every room, that is connected to an actuator which sits on top of a manifold and opens it and closes it when thermostat calls for heat. When the actuator opens it also starts a pump for that manifold. The thermostats run on 24VAC. The challenge I have is that these thermostats are pretty dump, you can only set a temperature and that’s it. I thought of replacing them with smart/programmable thermostats, but that is going to cost a lot, as I have 20+ throughout the house. So instead I am looking to build an arduino project.
- Leave the thermostats where they are and functional, but connect arduino to each section so that i could call for heat either from the thermostat or from arduino, i.e. Thermostat would be set to 68F, but I would call for heat from arduino (i don’t need to read temperature as I am accustomed to my infloor heat and I know i need to call it for about 30mins in certain sections to get to desired temperature), and then stop calling for the night from arduino and if the temperature dips at night the thermostat would call for heat on its own.
The thermostats are wired with 2 wires, and are powered thru these wires with 24VAC. Can i just simply plug arduino relay board into these two wires, and control the relay to fire on/off? If not how else would I need to wire this in.
Details of current design:
The thermostats I am using are:
Uponor a3030101 (http://www.supplyhouse.com/Wirsbo-Uponor-A3030101-Wirsbo-Radiant-Thermostat-WT-1-Heat-Only-Two-wire-2063000-p)
they say the thermostat uses two modes " differential mode and pulse width modulation (PWM) mode" not sure what it mean or if it matters
See attached diagram I found online, which is almost identical with my wiring, the only difference is that my thermostats are wired to each actuator and here they have two thermostat controlling all of the actuators so either one can call for heat. So same concept. See the red diagram, would this work? would I need anything else in the schematics or simply connecting the wires here would work?
The question is, if the relay option is Ok, can I simply connect to the same wire nuts where the 2 inputs are from thermostats are wired from?