Set a delay in closing the smart valves after the "OFF" command to the boiler

When the boiler is sent to OFF, by the thermostat or by the intelligent valves, there is always a post-circulation time foreseen by the various manufacturers to allow the disposal of the residual heat.

With Tado the thermostatic valves are closed immediately, generating overpressure in the circuit, and forcing you to leave one/two radiators always open, depending on the system.

Setting a simple programmable delay would solve the problem.
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  • samd
    samd ✭✭✭

    We need one of our clued-up members on here to comment but is it not the boiler system itself which determines when it has cooled down enough to switch off the circulating pump and that 'decision' is influenced by temperature, load etc at the time of tado shut-down?

  • The pump still works for a few minutes, for example the vaillant for 15 minutes. Finding all the radiators closed, it goes into lockout.
  • samd
    samd ✭✭✭

    Not sure what you mean by 'lockout' but my Worcester Bosch I have just timed and it took less than 3 minutes to cool down. There must be many factors to consider such as boiler type, size of radiator used for run-on, the level of heat in the system at the time of tado shut-down etc.

  • That’s the point of the bypass. It’s not a job for the TRV, it’s part of the system design.