converting to fully pumped system

[giarc00007]

hi guys im converting a gravity hot water with pumped heating to a fully pumped system. My question is im taking out old 28mm circs and replacing with 22mm what is the rule on the t on the shared return?

 

[ShaunCorbs]

you mean the t rule if yes

bypass, cylinder return and heating return are connected, After the heating return the cylinder return and bypass should be teed in at right angles to prevent reverse circulation.

 

[giarc00007]

you mean the t rule if yes

bypass, cylinder return and heating return are connected, After the heating return the cylinder return and bypass should be teed in at right angles to prevent reverse circulation.

great thanks