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  1. F

    Auto bypass setting

    I wouldn't say cured, but does seem to have helped, as the "ramping up" seems to be more controlled. What I can say is that a lower d0, the boiler behaves differently on initial start up, so Im not sure 60% of 38KW is correct. Perhaps x% of d0. MAGNA1 was over £400. I decided to buy the UPS...
  2. F

    Auto bypass setting

    I did do this at one stage, but found the system was very slow to heat up with both upstairs and downstairs calling for heat.
  3. F

    Auto bypass setting

    Very honest answer - and I've begun to learn that a lot to do with heating systems are educated guesses, and some compromises, on the whole. Not that there's anything wrong with that if it means the system does what it's supposed to. No, I have approximately 1m 28mm to the zone valves...
  4. F

    Auto bypass setting

    Thanks seems like a sensible answer. Im not planning on touching the system further, but am still curious as to how one would setup a system from scratch to cater for multiple zones (without a low loss header).
  5. F

    Auto bypass setting

    Are you always so aggressive? If I had the answer, I'd have said thank you and been on my way. As it happens, your answer may well work in some, or even most, situations, but here, I've told you that closing the bypass so that it opensoonly when all other zones are closed (as you described)...
  6. F

    Auto bypass setting

    I have tried. Unfortunately, I've been very unlucky in that none of the heating engineers who came out were able to fully resolve my problems. I had many suggestions and spent quite a fair bit of money in trying various solutions, but in the end I decided I'd try to understand the problem myself...
  7. F

    Auto bypass setting

    Correction to my earlier mail. Page 8 of the installation and service manual shows the boiler specification. This states the *minimum* output at 38kw as 27.2 l/min.
  8. F

    Auto bypass setting

    Yes, I think you're right. My mistake. I was using the graph in the MI's. However, the problem seems to stem from the boiler firing at full (or a percentage of full) power for the first minute or so. My posts are slightly delayed as they need to be approved, it seems. However, as said in...
  9. F

    Auto bypass setting

    Thanks all for replies. Albatross - am I right in saying that having the bypass open in this way is not (significantly at least) detrimental, in terms of gas usage ? Nostrum, completely agree. To give some background. I fitted the 25-80 because I was unable to run my boiler at any more than...
  10. F

    Auto bypass setting

    Thanks for the replies, but I think you've both missed the main point in my question. I've read the bypass instructions, and set the bypass accordingly. My question relates to a 2-zone heating system. I.e. even under "normal operation", the CH circuit will be restricted because one of the zones...
  11. F

    Auto bypass setting

    I have recently fitted a grundfos ups 25-80 and want to ensure my auto bypass is set correctly, but looking for some technical advice on how it should function on a system with more than ome heating zone. This is on a system with a vaillant 438, two heating zones (approx 26kw d/s, 18kw u/s)...
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