Just to start off I will not take any responsibility if any one uses or takes any advice from this post it is purely how I was shown by the people I worked with as an apprentice and the original 3 T rule which I have never installed due to my young age ? As this type of pipe layout is very old school and would never be installed today and has not for a lot of years, but the principle is that you always Have the return from the cylinder piped to the centre of the tee and (which I and the people I worked with call the three T rule which may be wrong but it just what we call it as reminds you of the importance of correctly putting your tees in to stop the possibility off back circulation, and with more heating systems having more than one heating zone this is very important on paper it does not seam important and when I worked for a company that had 70 installers working for them they would not all follow what I call the 3T rule and most of them thought I was talking crap but I was the one sent to sort it out when they had moved in to there brand new home and when it got to the summer some of the radiators would get hot only way to sort out lift up all there new carpets and re pipe using the rule and did this to lots of new build homes other installers had fitted out not following what I call the 3 T rule in there 1st fix, having not been to collage in the last 24 years there may be a correct name for this some one who has just finished collage may know, I have done a quick sketch of how the three T rule started but has no importance in how we install today,also the way I install not going to go in to to much detail you people that install for a living will no what is what and if I have missed any thing it was a quick sketch looking at the way to correctly Tee in your returns,
View attachment 10125but would be interested how many of you do what I call the 3 T rule as most of the people I worked with on the company I did not do my apprenticeship with thought what I call (you no) was a load of crap sorry for the long post