Hello all, I am moving into a new apartment, and was planning on replacing the thermostats with Z-Wave ones. I currently have a Honeywell T6 Pro Z-Wave in my current apartment, and was planning on picking up a couple more.
When I was at the new place today, I took a look inside of one of the thermostats and saw something I was not expecting. They are all 120VAC line voltage thermostats. The heating and cooling is shared between the building, and whether heating or cooling is on is a whole building schedule. The person in the leasing office that was touring us around the new place when we got our keys said that it switches to heat in october or November.
Attached are a couple of photos of the thermostat and a photo of the vent in the wall (although not sure if that is helpful). The thermostat is a Honeywell T651A. I am not sure of what the actual HVAC equipment looks like.
This obviously throws a hamper in my plans, and now I have to look for alternatives. I am not super familiar with 120VAC HVAC, so I wanted to get some advice from others. I believe it is a heated/chilled water system, and the thermostat simply controls the pump/blower in the wall panel (one of the photos). The fact that there is both heating and cooling is what is confusing me, since all of the 120VAC thermostats I have seen are only for heating. Obviously it all boils down to how the temperature is compared to the set point. If the building switches to cooling (which won’t be a problem for about 6 months after it switches I am guessing), the comparison will be backwards.
If anyone is able to point me to any resources on how I can learn about this control system, that would be great. I found the Stelpro KI Z-Wave Thermostat which I think will work, but I am not sure what happens when it switches to cooling in the spring. I prefer Z-Wave since I have found it to be far more reliable (especially in a larger building. This is a 7 floor building with ~15 units on each floor. So there is a lot of 2.4GHz traffic I assume), however if anyone knows of a product that will work for this (if the Stelpro one won’t) I’m all ears.
Yeah, this is something I’m also toying with. Just get a relay and temp sensor and fake it out.
However this is not my first choice, as I prefer to still have control of things if HA is down or something. So I wonder if I could wire it in with the existing therm to provide the ability to override. Like when adding a real to a switch.