I only have a W and a Rh wire for my current thermostat would I be able to install a 24 volt power adapter/transformer to mimic the c wire? Nest and ecobee offer this as an alternative to C wires and wondering if the same would be possible for the wyze Thermostat.
Yup! I have mine set up with only a red and white wire and then have a 120 to 24VAC transformer in the wall going to Rc and C on the thermostat.
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Yes, connect the adapter to Rc and C and your current thermostat wires to Rh and W
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My current thermostat has W and R wires. Where would the wires for the adapter go for me?
The thermostat wires go to Rh and W1
The adapter wires go to Rc and C
Make sure you tell the wyze app that you have these 4 wires:
Rc Rh W1 C
Thanks folks. This is great information.
I’m switching out an old mercury thermostat. Two wires only.
So OK, thermostat wires to Rh and W1. I’m guessing that it doesn’t matter which wire goes to which terminal since this is only about the relay aspect of opening and closing this circuit. I assume the Wyze thermostat is able to handle whatever low current is passing through.
As to the 24 v adapter wires, again I am assuming that it doesn’t matter which wire is connected to which terminal, just that they are connected to Rc and C. Once connected, I should see the thermostat light up ready for programming!
As long as your furnace doesn’t use millivolt controls, you are correct. millivolt controls are sensitive to the small current that the wyze will pass through the RH and W1 wires, so if you have millivolt controls, or an aquastat, it is advised to use an isolation relay between the wyze and the device, as shown here: