Adding an extension box to a wired smart thermostat
Hello, Currently I have two thermostats wired to separate heating zones. I have a S plan setup with a boiler and a separate hot water tank. Currently the boiler comes on when the HW calls at any time. I want to use the extension kit to put time controllers on the HW for the boiler to reduce when it will be switched on.
The installer instructions I have found for an extension box and S-plan only refer to wireless thermostats. I'm not sure if the stats I have work in both configurations and what I should do with the wires from them.
Is there any instructions covering my setup. My thermostats have firmware 54.20 if that makes any difference.