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  1. notorious

    Vaillant heat only boiler + switched live thermostats + weather comp?

    Correct, the d0 is global. For radiators heating mode we have one resgister to set the heating limit (same register is controlled by knob if you don't have weather compensation) and for DHW mode we have another register to set the limit. So, for radiator heating you can choose 40C and for DHW...
  2. notorious

    VR65/VR66 for HW flow temp control

    Bwel, -- he was saying that one of two CYL terminals has permanent 240v in it, so it can be ignored during the wiring. The other therminal can be connected directly to switched 240v. This is just like you do with RT terminal in your boiler. Once you have 240v on that second terminal the VR65...
  3. notorious

    Vaillant heat only boiler + switched live thermostats + weather comp?

    Bwel, -- VR65 can only put boiler into DHW heating mode via eBus command by receiving 240v from the outside. In that mode there's a separate register (forgot the exact number) that limits temperature during DHW heating cycle. I personally configured it for 80C. In DHW mode boiler can't go any...
  4. notorious

    Vaillant heat only boiler + switched live thermostats + weather comp?

    Why not? Try it. Calculate all heat demand situations and see if it works for you. The Valliant native thermostat will request heat via eBus command. Once that happens, VR65/VR66 will open valve for you.
  5. notorious

    Vaillant heat only boiler + switched live thermostats + weather comp?

    Better late than never. Wiring is extremely simple. When the replay is off that means that Nests are allowed to steal heated water when DWH heating cycle is active. It does not mean that hot water circuit is always off.
  6. notorious

    I'd rather drive on the left

    I'd rather drive on the left
  7. notorious

    Vaillant heat only boiler + switched live thermostats + weather comp?

    >> Having it (control box) mounted to the front of the boiler sounds good. Yes. That will automatically de-active the build-in Vaillant thermostat that you don't need.
  8. notorious

    Vaillant heat only boiler + switched live thermostats + weather comp?

    >> Whilst wiring up the sensor takes longer, just feels more likely to last longer. Yes, that's forever. Also, no worries about losing wireless signal. Make sure you have access to shady northern-facing wall.
  9. notorious

    Vaillant heat only boiler + switched live thermostats + weather comp?

    I guarantee you that your boiler comes with no VRC 252629 edge connector fitted. If you source VRC470 in a sealed new box it will have that connector and a 3 pin connector for in-fascia installation in it. If you source just a bare used VRC470 you'll just google for VRC 252629 and get it. Same...
  10. notorious

    Vaillant heat only boiler + switched live thermostats + weather comp?

    >> I'm wondering if my boiler pcb has that port to connect it to? It doesn't have that port now. When you buy VRC 470 make sure it is supplied with edge connector and with 3 pin connector for the boiler fascia. Here's how you do that: If you choose wired path. There is wireless VRC 470f...
  11. notorious

    Vaillant heat only boiler + switched live thermostats + weather comp?

    >> You have clearly done your homework on all of this Download manuals and just read them. That's all I have done. Now enjoy heating the way it should've been done from day 1. Save some money too.
  12. notorious

    Vaillant heat only boiler + switched live thermostats + weather comp?

    >> Is your outside sensor a 693 that wired to the vr65 or to the ebus directly? The sensor is wired to boiler PCB via edge connector VRC 252629 Edge connector is normally supplied with VRC 470. VR65 knows nothing about whether compensation. Sensor 693 is a basic thermistor sensor. Sensor on...
  13. notorious

    Vaillant heat only boiler + switched live thermostats + weather comp?

    As a bonus a simple relay, a switch and an indicator lamp. The lamp shows us that 240v DHW is active. When 240v DHW is active and when switch is ON the relay breaks 240v live for heating demand, shutting all heating valves that results in immediate removal of 240v from RT terminal of the...
  14. notorious

    Vaillant heat only boiler + switched live thermostats + weather comp?

    Give him £20 and he's post anywhere. Cash is king.
  15. notorious

    Vaillant heat only boiler + switched live thermostats + weather comp?

    >> Vaillant tech support told me my 2011 ecotec plus wouldn't work with VR66. There's a switch on VR66 that makes it VR65 for compatibility Buy yourself VR65 for £5 from Facebook (link above) and done.
  16. notorious

    Vaillant heat only boiler + switched live thermostats + weather comp?

    There is one VR65 on Facebook marketplace for £5 in Camberley. Do you have some fuel? :) :) https://www.facebook.com/marketplace/item/401628957876155 VR66: https://www.facebook.com/marketplace/item/341584387716636 https://www.facebook.com/marketplace/item/2985429798358734
  17. notorious

    Vaillant heat only boiler + switched live thermostats + weather comp?

    "All good things come to those who wait" Search for VR66 too. VR66 can work in VR65 mode. People remove stuff because the migrate to comb boilers and put them on eBay for pennies. Search gumtree and Facebook marketplace too. Save the search so that eBay will tell you when it becomes...
  18. notorious

    Vaillant heat only boiler + switched live thermostats + weather comp?

    >> the flow temp to radiators is based on the weather compensator (and it's settings) Yes >> and the flow temp for charging DHW is from the boiler control knob then? Nope. DHW charging temperature is stored in d-register (don't remember exact number). Open boiler manual and you'll find it. By...
  19. notorious

    Vaillant heat only boiler + switched live thermostats + weather comp?

    Hello, I only have VR65 on eBus You will also need VR65 that to install weather comp. (VRC 470 is in boiler fascia, but technically also on eBus) Why you need VR65? Because in weather comp mode your boiler will run in low temperatures and will be unable to heat hot water cylinder. Hot water...
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