![]() Wire the coil side of the relay to W and C on the thermostat and wire the normal open set of contacts on the relay to complete the circuit for the in-floor (what the current thermostat is doing now). Wire the transformers high side (120/230v) to a power source (any) than wire the low side (24v) to the R and C on the thermostat. If the wiring is accessible what I've done on a couple occasions (I work in building controls btw) is use a 24v thermostat that is designed for the application (in-floor radiant), a 24v relay and 24v step down transformer (those are overkill because I don't know your setup). And the fact that they are going to introduce a thermostat specifically for in-floor leads me to believe there isn't. I checked Mysa webpage to see if there was setting for adjusting this. However they are typically 24v thermostats, not 120-230v. Professional lines of thermostats have a very wide range you can set this too so the same thermostat can control a heat pump, gas furnace, in-floor, cast iron radiators, convectors, etc etc. Conversely in-floor radiant is heating mostly with radiation, since its the floor there is a lot of mass so it takes a while to heat and it takes a while to cool. Electric baseboard is heating nearly entirely with convection and since its electric (low mass) it heats and cools quickly. Unfortunately electric baseboard is nearly the polar opposite of in-floor radiant. Much like the brakes on a car, the faster you are going the sooner you need to start slowing down when coming to a stop, if you don't you will overshoot your target. It's anticipating that the heat source needs time to cool off and it will continue heating during this time. This is the basic logic for the thermostat to turn the heat off prior to reaching its set point. The function that would make a 120-230v thermostat incompatible with a 120-230v heating source would be what is typically called 'heat anticipation' generally controlled by the thermostats CPH (cycles per hour) setting. ![]() Being its 120-230v you could wire it to turn on a TV if you wanted too. A thermostat is just a switch that is controlled by temperature.
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