The HCE20 is a wired underfloor heating controller for both heating and cooling.
The controller can control up to six individual temperature zones. For the temperature control of the individual Zones/rooms the OpenTherm room thermostats T4M, T87M and T87HC are used. With the T4M as Zone 1 thermostat it is possible to set also the other zones to an energy saving temperature (ECO function). For example, if the program in the T4M goes the night setting the other zones will also go to a lower temperature. Also with the T4M as zone 1 thermostat the changeover from heating to cooling or vice versa can be made. The heat demand from all the zones is via a fuzzy logic control algorithm converted into general heat demand. An on/off or OpenTherm(R) communicating boiler can controlled with the different outputs. An integrated pump relay ensures that the pump runs when heat is requested from one of the zones. If required, an outdoor and supply water temperature sensor can be connected to control the boiler according to outdoor temperature compensation. Cooling can easily be added via a cooling module. This module has a cooling demand output and a heat/cool changeover input to change the status of the controller (external switch). There is also a separate heating and cooling status output to control the valves in the supply pipes.