Thermostat - Aux Heat Control

[SlabSlayer]

From what I have been reading, there are two ways that the Wyze Thermostat controls the Aux & Emergency Heat. Aux Automatically or Emergency Manually.

If connected to the " W1 " lug on the thermostat, it will control the backup as Aux Heat Automatically and turn it on if the heat pump can’t achieve set temp (+ differential) within 30 minutes or if the temp delta between the measured temp and target set temp is +5°.

If connected to the " * " lug, it would operate the backup manually as Emergency Heat, but there are drawbacks to this mentioned below:

@speadie

“*” has it operate when emergency heat is on. but the wyze’s implementation of emergency heat is rather poor, it appears to disable the thermostat’s temperature control and it’s just an on or off switch.

If jumpered, it could theoretically be used in both situations, but would need to be tested to confirm.

But, both must be specifically designated when doing the wiring setup on install.

@speadie would be best to verify my understanding of this though as it was their post that brought me to this conclusion. Because the OP had electric EH, it may be different and Speadie is the expert here.

Wyze Thermostat With Heat Pump

The blue W2 wire is your heating coils, so if you wanted to run it as both emergency or stage 2, you would wirenut 2 short jumper wires to it, and attach one of them to W1 and one to *. If you only wanted it to be emergency heat, you could attach it to * only, but then your house might get colder than you like until the emergency heat temp is hit and the heat switches over to emergency mode. Either way, you’d have to reset the wyze and remove it from the app and then re-add it, telling it that y…