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Type: Posts; User: bruce_miranda

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    You want the room warmer because your perception...

    You want the room warmer because your perception of warmth/comfort is different based on the outside temperature and hence heat loss. Which is why a 20C room feels warmer in the summer than in the...
  2. The boiler provides a useful D.9 status to show...

    The boiler provides a useful D.9 status to show if the HW mode is on or not. Ofcourse if you are standing in front of the boiler the flashing Tap icon is just as good. But if like me you are using a...
  3. D.78 is effective only while the CYL terminals...

    D.78 is effective only while the CYL terminals are closed (looped). And yes then, any boiler knob position is ignored and the flow temperature ramps up to what D.78 is set to.

    When the CYL...
  4. Another advantage of Evohome and the VR65 is that...

    Another advantage of Evohome and the VR65 is that you can set the HW differential on Evohome.

    In the VR65, the differential is always 5C with the NTC and almost 0C if using a standard cylinder...
  5. I believe you have a LLH, which is probably why...

    I believe you have a LLH, which is probably why you have never seen the need for the partial load settings. I don't, so if the load is too high, my boiler will go into an S.53 because my pump isn't...
  6. This is what my VR65 connections look like....

    This is what my VR65 connections look like. Notice there is no valves, or NTC connections.

    The eBUS is connected directly to the eBUS connections in the boiler. As my VR33 has its own slot. But...
  7. You don't need to use any Vaillant controls...

    You don't need to use any Vaillant controls besides the VR65 wiring centre. I don't.

    Look in the VR65/VR66 manual and you will notice that everything on the eBUS side is marked as optional....
  8. If the Orange wire from the DHW zone valve is...

    If the Orange wire from the DHW zone valve is indeed not connected the Terminal 4, and the guy is sure of it, then it could mean that eBUS uses a different boiler trigger when in DHW heat mode. But...
  9. Vaillant flow temperature control for HW using Evohome/OT

    I thought I would describe the two methods I have used for having a higher flow temperature for HW when using Evohome.

    I have a Vaillant 438 boiler. I use Evohome and OT. In order to use OT on...
  10. 1. eBUS can do (atleast) two things. It can vary...

    1. eBUS can do (atleast) two things. It can vary the required flow temperature and it can fire the boiler. In order to fire the boiler, it needs the terminals 3-4 linked. However if you do not link...
  11. Just checked this. Like I suspected, the Left...

    Just checked this. Like I suspected, the Left hand CYL terminal is 230V Live. And the moment that 230V live reaches the Right hand CYL terminal, the boiler is put into DHW heating mode.
    So my...
  12. Correct. I actually think that the way the CYL...

    Correct. I actually think that the way the CYL terminals work is similar to the 3-4 boiler SL terminals, where terminal 3 provides the 230V output and terminal 4 is waiting to receive it. In reality,...
  13. You can test this quite easily. I actually think...

    You can test this quite easily. I actually think one of the CYL terminal is actually supplying a 230V live and the other terminal is simply there to accept that 230V voltage via the cylinder...
  14. The way I use the VR65 is by using the...

    The way I use the VR65 is by using the microswitch (grey and orange) wires in my DHW to close the CYL inputs on the VR65.
    My DHW zone valve is switched on by Evohome, but it doesn't need to be....
  15. Have you seen how many people are ahead of you in...

    Have you seen how many people are ahead of you in the queue. Yup definitely legit and definitely sold out.
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    I have confused your thread sorry. You were...

    I have confused your thread sorry. You were asking if an unvented cylinder could be placed after the boiler. This is the normal configuration. And Evohome will work for you.

    What I was saying is...
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    I had no idea that some combis could even work...

    I had no idea that some combis could even work with a 60C inlet feed. But apparently Intergas etc are happy with that.
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    If you have solar panels there is another option....

    If you have solar panels there is another option. It involves putting the Unvent Cylinder before the combi. But this only works with some combis and only makes sense, if you have solar panels.
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    Outside Temperature weather compensation affects...

    Outside Temperature weather compensation affects the Set Point and not the start time. Start Time is driven by Optimisation.
    Note, I only mentioned Start Up, because in Shut down both are used in...
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    That looks fantastic, if you ask me. And if you...

    That looks fantastic, if you ask me. And if you are using an external sensor then there is no issue either.
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    I recently went through this decision process for...

    I recently went through this decision process for a friend and landed back at Evohome. Ofcourse in her case, she wasn't invested in either ecosystem. Evohome still won on several counts. Hive didn't...
  22. When you are controlling the boiler trigger via...

    When you are controlling the boiler trigger via the Terminal 4, that question becomes irrelevant. The moment there is no 230V on the Terminal 4, the boiler starts the pump overrun timer and then...
  23. OT needs to perform basically two actions, fire...

    OT needs to perform basically two actions, fire the boiler and provide a target flow temperature.
    Simply connecting the OT, with the terminals 7-8-9 and 3-4 left unconnected, the boiler wouldn't...
  24. Infact what I would say is that if you were...

    Infact what I would say is that if you were controlling this via the normal Terminal 4. Then DON'T connect the terminal 7-8. It works perfectly as you want it. Because your boiler trigger is still...
  25. You've just given me an idea to try something...

    You've just given me an idea to try something else. My Vaillant 438 doesn't have a HW sensor input, but it can have a HW setpoint separate from CH. The HW set point dial is useless unless used in...
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