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Replacing the thermostat with a relay switch


kickonhigh

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hello,

could someone help or give some hints how to connect relay switch instead main room thermostat which was connected by this four cables as on screen below , I want to be able to send to CO boiler signal to start heat or stop heat , is this possible  ? of course there are TRV on radiators to control flow .

btw. what kind of signal is send to boiler ? or is it just a open/close circuit ? 

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It's possible, it's seems to be a open/close circuit. But is the connection of the room thermostat 230v or 24v? Do you have the manual? And with brand of heating do you have?

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  • Topic Author
  • thank you for support, 

    could you please look at the picture and see if is it correct connection ? does it matter if I connect red cables to IN or Q1

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    if I am not mistaken, you can connect the wires as I have drawn. then you can even use your old thermostat. If you thermostat really switch 230v.

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    Otherwise you are correct in you picture, that's the way you can connect the wires. it does not matter where you are connecting the red cables to IN or Q1.

    Edited by Reinhold
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  • many thanks for clarification ,

    I don't want override scenes, which rely on temp. sensors,  by this thermostat so i will choose second option 

    Edited by kickonhigh
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    • 11 months later...
    On 11/29/2017 at 7:56 PM, Reinhold said:

    if I am not mistaken, you can connect the wires as I have drawn. then you can even use your old thermostat. If you thermostat really switch 230v.

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    Otherwise you are correct in you picture, that's the way you can connect the wires. it does not matter where you are connecting the red cables to IN or Q1.

    I would not advice to put 230V on thermostat wires... The blue and red from the boiler should be indeed connected to the IN and Q1. The switching should be done by the controller, not manually. 

    Edited by Comfortica
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    2 hours ago, Comfortica said:

    I would not advice to put 230V on thermostat wires... The blue and red from the boiler should be indeed connected to the IN and Q1. The switching should be done by the controller, not manually. 

    for this, you need the first serie switches (not the 2 version)

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    14 minutes ago, akatar said:

    for this, you need the first serie switches (not the 2 version)

    Yes, I know that :)There is a relay switch and a regular switch. But, actual switching in both cases is 230V. So yes, you can run the red and blue wire to IN and Q1 of the relais module to control the boiler. But, you should not run L and S1 to the old thermostat. 

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    .Thanks for the quick reply!

    Picture of the situation attached.

     

    Just to recap.

    - Should not be using the Relay Switch 2x1,5kW for this;

    - Thermostat wires go in IN and Q1;

     

    Question remains.

    - Where do I connect the 230V, which ports?

    - what version Fibaro swich should I buy?

     

    Thx for the help!

    Bart

     

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    @Klompie The wires on the thermostat are not the same as the ones on the pcb (in the picture you posted) where are the wires from the thermostat go to??

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    6 hours ago, Klompie said:

    .Thanks for the quick reply!

    Picture of the situation attached.

     

    Just to recap.

    - Should not be using the Relay Switch 2x1,5kW for this;

    - Thermostat wires go in IN and Q1;

     

    Question remains.

    - Where do I connect the 230V, which ports?

    - what version Fibaro swich should I buy?

     

    Thx for the help!

    Bart

     

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    You can use the relais module. Just do not connect you thermostat to it ;)

     

    The module itself needs 230V power. So, connect a Live and Neutral (brown and blue) to the L and N of the module. Then, connect the blue and red wires that run to your boiler, to the IN and Q1 of the module. (does not matter which color to IN and Q1). 

     

    After that, you can replace your thermostat with a zwave enabled thermostat. 

    Edited by Comfortica
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    Place the Fibaro switch near the boiler and switch a hard relais that in turn switches the 0.8qmm blue and red wires.

    But make sure you connect to boiler/ kettle/ heater as on/ off and not opentherm. Please read manual for your heater to check.

     

    Jim

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    14 hours ago, Comfortica said:

    You can use the relais module. Just do not connect you thermostat to it ;)

     

    The module itself needs 230V power. So, connect a Live and Neutral (brown and blue) to the L and N of the module. Then, connect the blue and red wires that run to your boiler, to the IN and Q1 of the module. (does not matter which color to IN and Q1). 

     

    After that, you can replace your thermostat with a zwave enabled thermostat. 

    Thx for the clear instructions. Have 10x Fibaro heat controller which should be acting as individual thermostats. Need to create scenes where my heat-controller is asking for warm water and tells the switch to connect (so the central heating unit starts working).

    Won't be using a central zwave enabled thermostat. 

     

    Can anyone help on the scene? As mentioned, 10x heatcontrollers & thermo sensor all over the house.  
    Heatcontroller sensor detects low temp during pre-installed day schedule, then tells switch (at Central heating unit) to connect and provide warm water.

     

    Thx,

    Bart

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    Do you use the Fibaro Heatcontrollers? And you have 10 pieces in you house?

    But you can't use the Heatcontollers into scenes to control you heater. You need Temperature sensors in the rooms and then you can make scenes to control you heater. 

    Edited by Reinhold
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    Hi,

    All 10x heatcontrollers come with the temperature sensor. 

    As far as I thought this would work..

    Fibaro heatcontrollers are setup.

    Sensor detects where heat is needed according the schedule.

    Heatcontroller starts scene where it triggers the switch at the heater.

    Radiator is provided with hot water.

     

    Temp sensor detects heat is reached.

    Heatcontroller shuts down and triggers switch to shut down.

     

     

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