The evohome Zoning Pack contains four HR80UK wireless radiator thermostats.
The HR80UK provides individual radiator control with multi point boiler interlock in heating systems where zoning is required. It can be fitted easily to any conventional radiator valve.
The associated controller (eg evotouch or CM927) provides the setpoint via the wireless connection. The internal sensor of the HR80UK measures the local air temperature, compares this with the setpoint and adjusts the valve until the desired temperature is attained.
If the HR80UK detects a sudden drop in temperature (ie if a window or door is opened) then the valve will be moved to a closed position to save energy. Normal operation will be resumed automatically once the window or door is closed.
The HR80UK can be manually adjusted to temporarily override the set temperature from the controller. This will create a demand and fire the boiler, until the next switching time at the controller.