Balancing Radiators


I’ve got a few questions about balancing radiators and hoping someone can help.I read up online on how to do it, and I’ve made a decent stab at it (the problem is definitely a lot better now), but I’m not entirely satisfied with the results and I still have a few questions about the procedure.I followed the instructions as per this page: pretty much ever other page I’ve seen is more or less a copy and paste of the same instructions and didn’t answer my questions.1) When I am supposed to almost close the lock shield on first radiator and slowly open until 12C difference, I assume I have to leave all other radiators’ valves fully open?2) When I move on to radiator 2, it has already warmed up and then I need to close the lock shield on this one and repeat the same procedure. I assume I don’t need to wait until it has cooled or anything?Then the biggie:3) My Bosch combi boiler seems to warm the radiator water on a pulsed basis. It heats up to 55 degrees or so, then powers down until it’s around 31 degrees, then heats again. I guess it’s for energy saving or perhaps just because return pipe temp is equalling the feed temp? Whatever the reason is, it means the inlet pipe temperature to each radiator fluctuates up and down while the outlet remains more or less the same. How am I supposed to measure when the difference between pipes is 12 degrees as per instructions? Should I be taking the mean average of the difference throughout the cycle? I tried adjusting lock shields until max diff was 12 degrees but that seemed way too low and the radiators were barely warming at all.In the end I used a bit of trial and error and hand waving to balance everything based on distance from the boiler and touching the radiators and I’m definitely in a better situation than previously – but I suspect there are still some improvements to be made.Can anyone explain how the procedure is supposed to work, and what I’m supposed to do to measure the 12C difference given the cycling nature of my boiler’s water temp? via /r/DIY

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