ᐅ Wall thermostat with rotary dial from Busch-Jaeger

Hello,

I built a new house this year and installed a Vaillant Arotherm air source heat pump with Unitower, 11 kW. The entire house has underfloor heating, and each room is equipped with a Busch Jäger room thermostat with a rotary knob. My question is how exactly should the room thermostats be set, and how does the setting on the rotary knob relate to the temperature set on the Unitower?

Thanks in advance for the helpful information :-)

Nafets444 schrieb:
My question is just how exactly do you set the room thermostats

Exactly, you don’t set them. They are approximate measuring devices. Their function is:

EMERGENCY BRAKE

In other words, your heat pump delivers heat into the room, and at some point, the air temperature reaches the set value on the dial.

The thermostat then immediately closes the valve, apparently stopping the heat supply. But since this is a underfloor heating system and the screed acts as a significant heat store, it continues to release heat into the room for hours, which can lead to overheating if additional gains from sun, people, appliances, ventilation, etc. occur.

Your heat pump itself has nothing to do with this. It waits until the thermostat opens the flow again.

Okay. But let's take an example. According to the datasheet, if you set the dial on the thermostat to level 4 (or the dot), it should reach about 20 degrees Celsius (68°F). However, if I set the temperature to only 19 degrees Celsius (66°F) in the Unitower, the thermostats set to level 4 would not reach 20 degrees Celsius (68°F). This means the heating in that room would run continuously, causing the electricity consumption to increase permanently, right?

Yes and no.

Which parameter do you set to 19 degrees on the Unitower?

Desired daytime temperature, I believe!?

The target temperature will be room temperature*. However, this usually refers to the room where the device is located. So, if you set it too low, you will never reach the desired temperatures.