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The boiler is a thorn emi appollo 4.0, the controller is a sunvic sp100, the pump a grudfos. Yes all very old equipment i know but so reliable, whilst other friends and family have shelved out fortunes for replacements, repairs and breakdown cover (for better efficiency!) over the years, my...

hi, i have an old style central heating system, boiler, pump, 3 way valve. For ages now i have been trying to solve the reason behind bad knocking of the pipes when the heating starts up. Recently i changed over the pump which had finally packed in, this did not resolve the banging. What i did...

Thanks for all the help Blagard, thought when i originally asked the question regarding the bypass pipe it was a common item in CH systems. At least i think i know what it is for now. I know i should start a new thread for my next question but seen as you probably know my system inside out by...

thanks, i will close it tomorrow and see what happens.

It goes into the bottom of the expansion tank on its own

Not all, the hallway, utility, toilet don't, rest have. Below i have added a diagram i found which shows a similar set up to mine, only one i could find showing this bypass pipe/valve.

The main pipe from the bottom of the cylinder comes out and then down through the floorboards,the 15mm pipe with the valve on joins this on the corner with a tee peice (15mm/22mm/22mm), hopefully i have added a new photo below which might show this better.

Just had a thought, one of the things i have noticed is that when i have the CH off but the Hot Water on for a while the radiators warm up a little. I thought this may be due to a faulty diverter valve, but could this bypass valve being open cause this to happen?

thanks, yes it is 15mm think my eyesights going, i was tempted to close it but was worried something bad might happen !! I will give it a try tomorrow. What should i be looking out for when i monitor the boiler? Also how did you put the photo in the post?

I should have moved that out the way before taking the photo, probably looks confusing, i bought it to replace the current one as i thought the current one was goosed, it was making strange noises but then was ok again so i put it down to other problems, might change it over anyway at some point.

oops sorry yes it is 15mm, it is smaller than the rest of the pipework so hopefully everyone got the general idea. I didn't really want to go into the problems in this post as i thought i need to make a seperate post for that but here goes: There are a few problems but the main problem i get...

3 port valve

i have tried to add a photo, not sure if i have done it the correct way, i clicked upload picture, then created an album called heating and added a photo to it, let me know if you can see it and that i added it the correct way. I have highlighted the pipe in question and the manual valve...

Wow can't believe how many people replied so quickly, much appreciated, i think next time i will try and add a picture/photo with a post. D_Hailsham, thanks, yes it sounds like it is a bypass, i was wondering that over time the valve may have been turned different to its original position...

Hi, first time i have posted so hope i have done this the right way! I have had a few problems with my conventional central heating system since I moved into the house. I am trying to get my head round how it all should work. The only thing I can not understand is a small 10mm pipe which is...