Two of these are live wires and two are load wires.
How to install a double pole wall mount thermostat.
Then remove the thermostat from the wall.
Using a wire connector connect the hot supply wire to the thermostat wires.
Make sure to connect the ground to the thermostat or wiring box if available.
It is usually attached to the wall and then with wire nuts to the wires coming from inside the wall.
For one thermostats situated in the lower 6 inches of a room are not accurately measuring temperature since cold air sinks.
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Since you are working with a double pole thermostat there should be four wires.
Stop the next steps will differ depending on which thermostat you are installing for single pole thermostats.
You should be able to bypass the unit thermostat and utilize the wall mounted thermostat only.
Thomas with cadet tech support shows you how to install a double pole wall thermostat on a 240 volt electric baseboard heater.
Typically this is marked l1 or line step 8.