Heating and Cooling for underfloor water tubes

[rudiratlos]

Hello,
I have underfloor heating that works with water. In winter, warm water is fed through for heating. In summer, cold water is channelled through for cooling. Is it possible to extend the generic thermostat so that winter and summer operation are possible? The control switches on the relay in cooling mode (summer) when the desired temperature (setpoint SP) is below the current temperature (process value PV). In other words, the reverse of heating mode in winter. My stupid thermostat (Siemens RAA41) see attached picture can be switched between summer and winter mode.

[rudiratlos]

the switchover from winter to summer mode should be controlled by an external variable (boolean).