Regleringar, termostater, styrsystem - Värmepumpen

Regulations, thermostats, control systems

Intelligent control system for residential ventilation

If the ventilation unit is the heart that delivers fresh air to your home, then its control system is the brain. This makes it easy to regulate, adjust and monitor your indoor climate.

One thermostat is a control device that must maintain an almost constant temperature in an order.

The simpler electric thermostats consist of a bimetallic spring that acts as a switch by bending differently at different temperatures. The actual closing of the circuit is often done with the help of a relay, to avoid sparking.

Thermostats can also be used in other contexts, for example in water-borne central heating systems and in shower mixers, where they can consist of a wax plug, which through its expansion can close and open a pipe opening.

Some alloys are magnetic below a certain temperature, the curie point, but become non-magnetic above this temperature. This feature can be used for thermostats. A practical application is temperature maintenance of electric soldering irons.

In the hypothalamus of the brain, there is also a biochemical thermostat function that regulates body temperature.

Bimetallic thermostats

A bimetallic thermostat is a mechanical thermostat in which a special spring, a bimetallic, shuts off and interrupts the current to the radiator at a changed temperature. A bimetal consists of two thin metal blades that expand differently with temperature changes. These are joined to form a bimetal and due to the different coefficients of expansion of the metals, the bimetal bends during temperature changes. A relatively large temperature change is required for it to be detected by a bimetallic thermostat. Hysteresis, i.e. the difference between switching on and off, is several degrees (up to 6 degrees) and the sensitivity gets worse and worse with time due to mechanical wear. The temperature in the room is not only uneven because the thermostat has difficulty sensing temperature changes. The temperature fluctuations in the room also become greater because the effect is either switched on all the time until the temperature has reached its upper limit value and then been completely switched off until the temperature has reached its lower limit value. This is in contrast to an electronic thermostat that regulates the temperature with the help of shorter time intervals between switching on and off, which gives a more even temperature.


Capillary tube thermostats

One capillary tube thermostat is a mechanical unit, which measures and controls a temperature, so that a constant temperature is maintained.

There are also max thermostats, often called overheating protection,

whose job is to monitor and prevent overheating.

In capillary tube thermostats, expansion and contraction of a liquid or gas, inside the tube and bulb, are used to open and close an electrical circuit, often via flat pin-connected connectors.

These thermostats are commonly used in immersion heaters, boilers, heat pumps, fan heaters and sauna heaters.

Electronic 2-stage thermostats

Processor-controlled 2-stage thermostat for room heating / cooling

Systemair SAVE Swedish

Synonyms for regulation

  • intervention, regulating, arranging, controlling, controlling; adjustment, setting