2x eDLT wanted in Ireland/UK

Discussion in 'Selling / Wanted C-Bus Equipment' started by Tension, Dec 26, 2025.

Page 2 of 2
  1. Tension

    Tension

    Joined:
    Apr 30, 2015
    Messages:
    91
    Likes Received:
    3
    Location:
    Belfast
    Excellent

    Seems strange that they discontinued all the heating stuff as smart controls get more and more popular ‍♂️

    Would love to have a way of having a thermostat and TRV controls in each room, so each room can call for heat individually as needed, but don't think that's possible at all with C-bus.
     
    Tension, Jan 7, 2026
    #21
  2. Tension

    Ashley

    Joined:
    Dec 1, 2005
    Messages:
    1,596
    Likes Received:
    195
    Location:
    Adelaide, Australia
    That is exactly what I am doing. I have a single ducted Daikin aircon and 8 Cbus thermostats. Each thermostat controls its own room damper. The Daikin is controlled by a modbus gateway connected to an SHAC. As the SHAC doesn't support the Cbus aircon protocol, a Cbus touchscreen converts the aircon data to measurement data. The SHAC the scans each thermostat looking for the highest set point (for heating), and the lowest room temperature (for the control level). It then sends them to the Daikin via the gateway. As each room approaches it's target temperature the thermostat closes its damper. The logic always ensures at least one damper is open, so as the last room reaches temperature the Daikin will back off (it's an inverter system), and eventually the system reaches an equilibrium and the thermostats just open and close the damper to keep each room at the set temperature. You can control each room from its own thermostat, centrally from the touchscreen, or remotely from the SHAC.

    This takes about 30 lines of code in the touch screen and another 30 in the SHAC.
     
    Ashley, Jan 8, 2026 at 2:51 AM
    #22
    Tension likes this.
  3. Tension

    Tension

    Joined:
    Apr 30, 2015
    Messages:
    91
    Likes Received:
    3
    Location:
    Belfast
    That sounds really cool! Unfortunately I don't have a SHAC, and it took me ages just to find a single thermostat. Why was it all discontinued?

    You'd think there'd be a massive market for non-cloud based solutions.
     
    Tension, Jan 8, 2026 at 3:07 AM
    #23
  4. Tension

    Ashley

    Joined:
    Dec 1, 2005
    Messages:
    1,596
    Likes Received:
    195
    Location:
    Adelaide, Australia
    The 5070 thermostats support individual room control natively if you have a simple relay based heating/cooling system. You can have up to 4 zones with one 4 zone controller and 3 single zone controllers. You just have to ensure that the zone valves are capable of frequent operation. I ran this system for yeas until my HVAC compressor self destructed and I had to replace it with an inverter based system.

    Cbus thermostats do come up occasionally on Ebay as people upgrade (downgrade?) to newer systems. I've paid between AU$50 and AU$200 for them.

    There's currently 9 available from the States:

    https://www.ebay.com.au/itm/1347575...X0gf5qRnxMHuZ3TQ4vbEG4kA==|tkp:Bk9SR6CV7sfzZg
     
    Ashley, Jan 8, 2026 at 7:21 AM
    #24
  5. Tension

    NickD Moderator

    Joined:
    Nov 1, 2004
    Messages:
    1,456
    Likes Received:
    77
    Location:
    Adelaide
    The only support in the eDLT for the C-Bus Thermostats is for displaying the zone temperatures... there is no control.

    Unfortunately it doesn't.

    To control HVAC from the eDLT you would need something that supports scripting logic to take lighting events from the eDLT and translate them to commands for your HVAC system.

    I've done this myself with a CoolPlug modbus interface for the HVAC Plant (Panasonic ducted system) and a relatively simple Lua script in the SHAC. On the eDLT, it uses 3 Shutter Relay widgets, because these simply send a separate lighting event for each button press, and can be labelled with Dynamic Labels, both of which are easy to work with in scripting.

    In your case, assuming the C-Bus Thermostat works with your plant, then you would need one of products that supports the Pascal Logic Engine, since the newer Lua scripting in the SHAC etc does not have support for the C-Bus HVAC Application which is used by the C-Bus Thermostats.

    The Pascal Automation Controller is probably the lowest cost entry point for this, but it doesn't have an Ethernet interface so there is no support for integrating with anything over IP.

    Just be aware that all of this stuff is usually done by System Integrators, and there is bit of a learning curve. It's not rocket science, but it's not as plug and play as many of the newer IoT systems.

    Nick
     
    NickD, Jan 9, 2026 at 1:05 AM
    #25
    Tension likes this.
  6. Tension

    Tension

    Joined:
    Apr 30, 2015
    Messages:
    91
    Likes Received:
    3
    Location:
    Belfast
    Well that is utterly depressing.

    I should never have started this project
     
    Tension, Jan 9, 2026 at 1:11 AM
    #26
  7. Tension

    Ashley

    Joined:
    Dec 1, 2005
    Messages:
    1,596
    Likes Received:
    195
    Location:
    Adelaide, Australia
    Obviously my memory is fading :). Perhaps it was in the original design brief but never eventuated.
     
    Ashley, Jan 9, 2026 at 3:39 AM
    #27
Page 2 of 2
Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Similar Threads

  1. din rail single channel relay wanted

  2. Work Wanted

  3. Wanted Minder IO interfaces

  4. Dali project in qatar - contractor wanted

  5. Help wanted

  6. Wanted: Serial DIN interface

  7. eDLT Firmware Upgrade - Failed to detect an eDLT unit connected to the computer

  8. Looking for a few fan relays in the UK/Ireland

Loading...