Floor heat control

Discussion in 'C-Bus Wired Hardware' started by jonnyp64, Sep 4, 2025 at 3:14 AM.

  1. jonnyp64

    jonnyp64

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    Sydney
    I service a building where all of the apartments have the floor heating wired in this manner (see image). The thermostats are permanently on for all 3 rooms with the load of each going through the NC contactor and then through a cbus relay channel. The coil of the contactor is controlled by a further cbus relay channel.
    I'm struggling to understand why this arrangement is necessary and was hoping that someone might have an answer?
    The individual load for each heating is less than ten amps and i cant find anything that triggers ch4 to open the contactor. I thought that it might be to provide an "all off" control-its not but if it was its unnecessary.
     

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    jonnyp64, Sep 4, 2025 at 3:14 AM
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