I have a PTAC unit that has two wires for low or high fan speed. Unfortunately with my Lutron environment, their thermostats only support a single fan speed (Beyond that, their thermostat is wonderful). I have to use a manual SPDT switch to change fan (or manually move the wire over between low/high).
Anyone have any ideas on an automated SPDT switch that can be controlled with Hubitat?
I was looking at possibly using MIMOlite, but unfortunately the only nearby power source I have is the 24V the PTAC unit is supplying to the thermostat controller. I'm not sure it would be compatible.
You can use an Aqara Double Relay or just about any dual relay. You just need to close an extra set of relays with the wireless relay. That will give you two dry contacts that you can keep dry or put any voltage and current through them, that the additional relays can handle.
This is how I control my alarm system’s 3V DC remote with a 120v AC Xiaomi Dual Relay. I’ve used this method a few times now. The cost is just $9 extra for two relays