Heating actuator

A comfortably warm bath after getting up or a cool bedroom at night - automatically. Who does not want that? Modern building automation makes it possible. The interaction of room temperature controllers, heating actuators and valve drives offers almost unlimited possibilities. The setup can be set up in all rooms according to the needs of everyday life.

What are heating actuators?

If you want to regulate the temperature in the room, in the apartment or in the entire building automatically, heating actuators play a central role. In principle, these are switching actuators. However, these are not equipped with mechanical relays. Thermoelectric valves (low ohmic loads) work here, which use electronic circuits (Triac) to ensure closed hot water circuits or chilled water (chilled ceiling). As a result, these devices are noiseless and wear-free.

How is room temperature controlled via a heating actuator?

The control difference determined by a KNX room temperature controller, i.e. the difference between the setpoint temperature and the actual temperature, is converted into a command value telegram. It is sent to the corresponding channel of the heating actuator via the KNX bus. Connect the thermoelectric (conventional) actuator to the duct using a suitable cable (e.g. NYM-J 3x1.5). The heating actuator can switch directly (1 bit) or independently process a received 1-byte command value signal internally. With the latter, the KNX bus is relieved because there is no flood of control telegrams from the room temperature controller to the actuator. Only the calculated control difference is sent to the actuator as a 1-byte command value telegram (0-100%). This converts the information into switching signals (on/off) directly to the assigned heating channel. This is called pulse width modulation (PWM).

 


TIP:

Make sure there are enough control channels on the heating actuator, ideally at least one per room. This creates maximum flexibility when controlling.


 

The following small example illustrates the rough functionality, not the actual, manufacturer-specific control algorithm:

The current temperature (controlled variable) is 20 degrees Celsius. The desired room temperature is 25 degrees Celsius and represents the set value for the controlled variable (command variable). The difference between the desired room temperature (set value) and the current temperature (actual value) is the control difference. The control difference is 5 degrees Celsius and is used to determine the manipulated variable that influences the room temperature. Assuming the manipulated variable is 20%. This value is sent to the heating actuator in the form of a 1-byte telegram (0-255 = 0-100%). The value 51 is therefore transmitted to the actuator. The time for opening/closing the actuator is stored in the parameters of the actuator using ETS. You can find this time in the properties of the respective 230V AC or 24V DC thermoelectric actuator. For example, the actuator takes 2 minutes to fully open. With a command value specification of 20%, the actuator would switch on the valve drive for 24 seconds (20% of 2 min.) and switch it off for 96 seconds. This process is repeated until the room temperature controller calculates and sends another command value specification. Depending on the manufacturer of the actuator, you can integrate several actuators per channel.

How do I find the right heating actuator?

The selection of a suitable heating actuator is linked to certain requirements. Answering the following questions will help you make a decision:

  • How many heating circuits does my system have?
  • How many actuators do I have per heating circuit?
  • Do I want to install the heating actuator centrally or directly in the heating circuit distributor?
  • Do I want to protect the power supply of the device via a connection for auxiliary voltage?
  • With what voltage do the actuators work?
  • Which functions should the heating actuator have?
  • Do I prefer a certain brand?
  • and many more

 

The range of functions of a heating actuator in particular can differ depending on the model. Things to keep in mind include the following:

  • Is it controlled with 1bit (switching/PWM) and/or 8bit (continuous) control values?
  • Is direct control with a temperature value possible via the KNX bus?
  • Does the device have an integrated temperature controller?
  • Are the setpoints saved in the event of a bus voltage failure?
  • Is there an emergency operation if the cyclic command values fail?
  • Are different operating modes available (comfort, night, frost protection, summer mode or winter mode)?
  • Is there a short-circuit detection and a voltage failure detection?
  • Does the device have a pump shut-off?

 

High comfort

Depending on the model, it is possible to set a minimum comfort temperature for the underfloor heating. An additional sensor measures the temperature of the floor and keeps it at your comfort level. This is very pleasant in barefoot zones such as a bath.


Depending on what value you place on the individual properties, the range of products can be limited to just a few models.

Can I connect a heating actuator directly to the actuators in my heating circuits?

In the case of a decentralized installation, for example in the heating circuit distributor, models with L and N connections can be used for direct connection of the actuators.

Are KNX actuators really bad?

Thermoelectric actuators are not wear-free and should be replaced every year. That is why expensive KNX actuators, which combine the KNX actuator and actuator, have not caught on and are disappearing from the market.

Source: eibabo®, Jung Triac 2336-REG-HZR-HE 6-fold KNX heating actuatorImage: Jung Triac 2336-REG-HZR-HE 6-fold KNX heating actuator

How are thermoelectric actuators installed?

Thermoelectric actuators (valve drives) are snapped or screwed directly onto the upper part of the valve used in the house. This connection with the valve spindle is usually made directly in the heating circuit distributor. You can use adapters made of PVC or metal to compensate for the manufacturer-specific distance differences between the drive and the upper part of the valve or the thread and the mount. In this way you ensure correct implementation of the manipulated variable.

How do I prevent rapid wear and tear on my valve drives?

The ETS parameter 'Flush' minimizes wear and tear on valves that are rarely used, for example in summer or in bedrooms. This function prevents rapid calcification of the heating valves.

 


Good to know

With actuators, a distinction is made between NC (normally closed) and NO (normally open). NC drives open when power is applied. In NO actuators, the current closes the valve.


 

Please bear this in mind when planning your heating system, as it is ultimately your personal decision. In the event of a power failure or defect, NC drives close and you quickly notice a malfunction. These drives only consume electricity when heating. On the other hand, drives that open without current are more efficient during the heating period. In this case, switching off the pump by the heating actuator after the winter season would be advisable. Otherwise you would continuously use electricity to keep the heating closed by means of the NO actuators in the warm season.

Who are the leading manufacturers of KNX heating actuators?

The leading manufacturers of KNX heating actuators at eibabo® are, for example, ABB, Berker, Busch-Jaeger, EIBMARKT, Elsner, Gira, Hager, Jung, Lingg & Janke, MDT, Merten, Siemens and Theben. We have more than 25 years of experience in the field of building automation and have arranged the order of the products in this catalog accordingly. Price/performance, quality and range of functions are particularly good for the heating actuators listed first.

 

eibabo - technology store

 

Catalogue content:


In this eibabo® catalogue Installation bus systems > Heating actuator for bus system you will find items from the following product groups:

Item overview:

  • Blind control
  • Blind function
  • Circuit control
  • Consumer control
  • Cooling outlet
  • DIN rail
  • Energy efficiency
  • Energy efficient
  • Energy measurement
  • Expansion module
  • Fan actuators
  • Heater output
  • Heater plug
  • Heater relay
  • Heating actuator
  • Heating box
  • Heating controller
  • Heating thermostatic valve
  • Installation bus
  • Lighting control
  • Manual operation
  • Socket control
  • Starter pack
  • Switching actuator module
  • Switching output
  • Thermostatic valve
  • Valve control
  • Ventilation actuator


from the following manufacturers:

Manufacturer overview catalogue Heating actuator:

  • ABB
  • Alre-it
  • Berker
  • Busch Jaeger
  • Eaton
  • Eltako
  • ESYLUX
  • Gira
  • Hager
  • Jung
  • MDT
  • Merten
  • Schneider Electric
  • Siemens
  • Theben


 
A comfortably warm bath after getting up or a cool bedroom at night - automatically. Who does not want that? Modern building automation makes it possible. The interaction of room temperature... read more »
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Heating actuators – Always the right temperature

A comfortably warm bath after getting up or a cool bedroom at night - automatically. Who does not want that? Modern building automation makes it possible. The interaction of room temperature controllers, heating actuators and valve drives offers almost unlimited possibilities. The setup can be set up in all rooms according to the needs of everyday life.

What are heating actuators?

If you want to regulate the temperature in the room, in the apartment or in the entire building automatically, heating actuators play a central role. In principle, these are switching actuators. However, these are not equipped with mechanical relays. Thermoelectric valves (low ohmic loads) work here, which use electronic circuits (Triac) to ensure closed hot water circuits or chilled water (chilled ceiling). As a result, these devices are noiseless and wear-free.

How is room temperature controlled via a heating actuator?

The control difference determined by a KNX room temperature controller, i.e. the difference between the setpoint temperature and the actual temperature, is converted into a command value telegram. It is sent to the corresponding channel of the heating actuator via the KNX bus. Connect the thermoelectric (conventional) actuator to the duct using a suitable cable (e.g. NYM-J 3x1.5). The heating actuator can switch directly (1 bit) or independently process a received 1-byte command value signal internally. With the latter, the KNX bus is relieved because there is no flood of control telegrams from the room temperature controller to the actuator. Only the calculated control difference is sent to the actuator as a 1-byte command value telegram (0-100%). This converts the information into switching signals (on/off) directly to the assigned heating channel. This is called pulse width modulation (PWM).

 


TIP:

Make sure there are enough control channels on the heating actuator, ideally at least one per room. This creates maximum flexibility when controlling.


 

The following small example illustrates the rough functionality, not the actual, manufacturer-specific control algorithm:

The current temperature (controlled variable) is 20 degrees Celsius. The desired room temperature is 25 degrees Celsius and represents the set value for the controlled variable (command variable). The difference between the desired room temperature (set value) and the current temperature (actual value) is the control difference. The control difference is 5 degrees Celsius and is used to determine the manipulated variable that influences the room temperature. Assuming the manipulated variable is 20%. This value is sent to the heating actuator in the form of a 1-byte telegram (0-255 = 0-100%). The value 51 is therefore transmitted to the actuator. The time for opening/closing the actuator is stored in the parameters of the actuator using ETS. You can find this time in the properties of the respective 230V AC or 24V DC thermoelectric actuator. For example, the actuator takes 2 minutes to fully open. With a command value specification of 20%, the actuator would switch on the valve drive for 24 seconds (20% of 2 min.) and switch it off for 96 seconds. This process is repeated until the room temperature controller calculates and sends another command value specification. Depending on the manufacturer of the actuator, you can integrate several actuators per channel.

How do I find the right heating actuator?

The selection of a suitable heating actuator is linked to certain requirements. Answering the following questions will help you make a decision:

  • How many heating circuits does my system have?
  • How many actuators do I have per heating circuit?
  • Do I want to install the heating actuator centrally or directly in the heating circuit distributor?
  • Do I want to protect the power supply of the device via a connection for auxiliary voltage?
  • With what voltage do the actuators work?
  • Which functions should the heating actuator have?
  • Do I prefer a certain brand?
  • and many more

 

The range of functions of a heating actuator in particular can differ depending on the model. Things to keep in mind include the following:

  • Is it controlled with 1bit (switching/PWM) and/or 8bit (continuous) control values?
  • Is direct control with a temperature value possible via the KNX bus?
  • Does the device have an integrated temperature controller?
  • Are the setpoints saved in the event of a bus voltage failure?
  • Is there an emergency operation if the cyclic command values fail?
  • Are different operating modes available (comfort, night, frost protection, summer mode or winter mode)?
  • Is there a short-circuit detection and a voltage failure detection?
  • Does the device have a pump shut-off?

 

High comfort

Depending on the model, it is possible to set a minimum comfort temperature for the underfloor heating. An additional sensor measures the temperature of the floor and keeps it at your comfort level. This is very pleasant in barefoot zones such as a bath.


Depending on what value you place on the individual properties, the range of products can be limited to just a few models.

Can I connect a heating actuator directly to the actuators in my heating circuits?

In the case of a decentralized installation, for example in the heating circuit distributor, models with L and N connections can be used for direct connection of the actuators.

Are KNX actuators really bad?

Thermoelectric actuators are not wear-free and should be replaced every year. That is why expensive KNX actuators, which combine the KNX actuator and actuator, have not caught on and are disappearing from the market.

Source: eibabo®, Jung Triac 2336-REG-HZR-HE 6-fold KNX heating actuatorImage: Jung Triac 2336-REG-HZR-HE 6-fold KNX heating actuator

How are thermoelectric actuators installed?

Thermoelectric actuators (valve drives) are snapped or screwed directly onto the upper part of the valve used in the house. This connection with the valve spindle is usually made directly in the heating circuit distributor. You can use adapters made of PVC or metal to compensate for the manufacturer-specific distance differences between the drive and the upper part of the valve or the thread and the mount. In this way you ensure correct implementation of the manipulated variable.

How do I prevent rapid wear and tear on my valve drives?

The ETS parameter 'Flush' minimizes wear and tear on valves that are rarely used, for example in summer or in bedrooms. This function prevents rapid calcification of the heating valves.

 


Good to know

With actuators, a distinction is made between NC (normally closed) and NO (normally open). NC drives open when power is applied. In NO actuators, the current closes the valve.


 

Please bear this in mind when planning your heating system, as it is ultimately your personal decision. In the event of a power failure or defect, NC drives close and you quickly notice a malfunction. These drives only consume electricity when heating. On the other hand, drives that open without current are more efficient during the heating period. In this case, switching off the pump by the heating actuator after the winter season would be advisable. Otherwise you would continuously use electricity to keep the heating closed by means of the NO actuators in the warm season.

Who are the leading manufacturers of KNX heating actuators?

The leading manufacturers of KNX heating actuators at eibabo® are, for example, ABB, Berker, Busch-Jaeger, EIBMARKT, Elsner, Gira, Hager, Jung, Lingg & Janke, MDT, Merten, Siemens and Theben. We have more than 25 years of experience in the field of building automation and have arranged the order of the products in this catalog accordingly. Price/performance, quality and range of functions are particularly good for the heating actuators listed first.

 

eibabo - technology store

 

Catalogue content:


In this eibabo® catalogue Installation bus systems > Heating actuator for bus system you will find items from the following product groups:

Item overview:

  • Blind control
  • Blind function
  • Circuit control
  • Consumer control
  • Cooling outlet
  • DIN rail
  • Energy efficiency
  • Energy efficient
  • Energy measurement
  • Expansion module
  • Fan actuators
  • Heater output
  • Heater plug
  • Heater relay
  • Heating actuator
  • Heating box
  • Heating controller
  • Heating thermostatic valve
  • Installation bus
  • Lighting control
  • Manual operation
  • Socket control
  • Starter pack
  • Switching actuator module
  • Switching output
  • Thermostatic valve
  • Valve control
  • Ventilation actuator


from the following manufacturers:

Manufacturer overview catalogue Heating actuator:

  • ABB
  • Alre-it
  • Berker
  • Busch Jaeger
  • Eaton
  • Eltako
  • ESYLUX
  • Gira
  • Hager
  • Jung
  • MDT
  • Merten
  • Schneider Electric
  • Siemens
  • Theben
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