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Thread: Anyone got a Vaillant eBUS timer/controller I could borrow

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  1. #1
    Automated Home Legend
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    Default Anyone got a Vaillant eBUS timer/controller I could borrow

    If people have an old Vaillant eBUS controller that was controlling the Heating and Hot Water schedule and then moved to Evohome then their old Vaillant eBUS controller must be sitting idle. I would like to study the comms between the controller and the boiler and was wondering any one had an old one kicking about that I could borrow for a few days?

    It needs to be one that controls both Hot Water and Central Heating.

  2. #2
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    I picked up one from the bay. Let's see how I get on with that.

  3. #3
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    Again wanting to know if anyone removed their Vaillant controls when moving to Evohome? I would like to buy the old Wiring control centre VR65 or VR66 and the cylinder sensor VR10. Don't want to pay full price for them as this is for a project and not for its intended purpose.

  4. #4
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    Again, got one from the bay.

  5. #5
    Automated Home Ninja Dan_Robinson's Avatar
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    The vr10 is just thermistor. Either 10 or 12k (I forget which) figure out which and I'll send you one. Can't help you with the other stuff though.
    Kind Regards - Dan Robinson (Jennings Heating Ltd)

  6. #6
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    Thank you for the kind offer. I have now managed to source a VRT360F and the VR65+VR10 that I needed for some playing around.

  7. #7
    Automated Home Ninja
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    Reviving an old thread here, but want to know how you went on?

    The in laws are having a new set up in their house, and with it being old house I want to run the radiators at a very low flow temperature but 24/7. However they'll be having an unvented cylinder as well so I need two different flow temperatures, as a flow temperature at 50oc isn't going to reheat the cylinder. Now they aren't technically minded and they haven't got loads to be spending on EvoHome and Opentherm so i've been looking at a VR66 and VRT350. Having not installed one of these before I wasn't sure you could achieve what I wanted, am I right in thinking that the controller allows you to have two different flow temperatures for cylinder charging and CH? The book whilst mentions something about this, it is still quite brief on the matter.

  8. #8
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    Yes with a VR65 or VR66 you can have two different flow temperatures. The VR65 comes with the VR10, the VR66 doesn't. I have a brand new VR65 for sale if you want and also have a timer clock too, but not new. PM me if interested

  9. #9
    Automated Home Sr Member
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    The dial on the front of the boiler sets the max temp allowed, and then the ebus controller adjusts it (never able to exceed the max). Thanks @bruce_miranda for this info.

  10. #10
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    The dials on the front of the boiler set the HW target temp for the cylinder and the Max Flow for the CH. If you are using a Vaillant programmer, you are meant to set both those to max and then use the controller to set the HW required temperature. The CH flow is then dynamically altered based on requirement. However if you ignore the instructions and set the dials to a number lower than max then the programmer cannot exceed the dials. The interesting bit is that the MAXes themselves can be changed in the installer menus. But generally when heating HW, Flow is set to 80C.

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