ᐅ Central room temperature controller for the fan coil unit (FCU) of the underfloor heating system

What exactly is the goal? Is it to prevent the children from tampering with it, or is there another reason?

In principle, a heat pump should not have a flow restrictor that can limit the possible flow rate. If the heating is set to 21°C (70°F) but the thermostats are set to 25°C (77°F), it doesn’t really make sense anyway.

StevoBrun schrieb:

What exactly is the goal? To prevent the children from adjusting it, or for another reason?

Basically, a heat pump should not have a flow restrictor that limits the possible volume flow. If the heating is set to 21°C (70°F) but the thermostats are set to 25°C (77°F), it doesn’t really make sense anyway.

We are building according to KfW55 standards and are also implementing a mechanical ventilation system with heat recovery.

According to the energy saving regulations, a flow restrictor must be installed.

Since we are using an air-to-water heat pump, which reacts very slowly to temperature changes, it is sufficient for me to use automatic programs (night setback) or set a fixed temperature.

This way, I don’t need regulators in every room, which neither look good nor offer the option to fiddle with them.

It’s not your air-to-water heat pump that responds slowly, but the underfloor heating.

Decommissioned control means there is only one place where you adjust the temperature, and that is at your heat pump.

The thermostats are out of use.

During the first two winters, you set the temperature for each room using the flow regulators on the manifold, and after that, you don’t touch them anymore.

Search online for “hydraulic balancing” or “thermal balancing” – there you’ll find an explanation.

T_im_Norden schrieb:


The thermostats are not working.

That is exactly the point! However, I’m not sure whether I want to adjust the valves myself or simply control the room temperature wirelessly with a remote controller.

At the moment, my main priority is the visual aspect—having no visible thermostat above the light switch in every room—but still having the option to use a wireless room controller if needed.

One possible solution could be a control unit similar to the "eQ-3 Homematic IP" system.

What I hope for:
1.) To remove the room controller as a switch/thermostat from the room or place a wireless component somewhere in the room that only transmits the room temperature to the control unit.

edit1: There are also motion sensors, window contacts, wall switches, and smart plugs that already have an integrated temperature sensor and can be used for underfloor heating control.

2.) To centrally set the temperature, similar to @T_im_Norden, so that the valve adjustment is done manually via the control unit by setting the target temperature manually.

Am I missing something here? Does anyone use a control unit for underfloor heating?

Good luck
M

Yes, you have a misconception.

You still believe you can control underfloor heating using the thermostats/ERR.

Thermostats only stop the flow; in the best case, this doesn't affect your heat pump, but you will experience significantly higher electricity costs. In the worst case, it will cause a malfunction and lead to premature wear.

The only place where the temperature should be controlled, after a successful hydraulic balancing, is the heating curve of the heat pump.

I don’t fully understand this.
If the base setpoint of the heat pump and the thermostats is the same, each individual heating circuit can be controlled separately from the room. In other words, my thermostat acts as the controller that opens or closes the valve.
If there are no thermostats or room sensors, then the system is controlled purely based on the heating curve or the outside temperature. For example, at an outside temperature of 15°C (59°F), this would mean a fully open valve, even though the room may have already warmed up to 21°C (70°F) due to solar gains (this is, of course, a bit exaggerated).