Can anyone explain this in simple terms perhaps with a diagram?
Read up from the John Reginald central heating book but without a diagram I'm non the wiser.
Does this only apply to "y" plans and anything to do with the 150mm between cold feed and vent from f+e cistern?
I know its the rule of thumb to prevent reverse circulation but tbh I don't understand it.
Fitted loads and normally common tee in a/c but doing alot of zoned heating now on both combi and un-vented systems so just wondering if it would make a difference where we joined all the returns.
Read up from the John Reginald central heating book but without a diagram I'm non the wiser.
Does this only apply to "y" plans and anything to do with the 150mm between cold feed and vent from f+e cistern?
I know its the rule of thumb to prevent reverse circulation but tbh I don't understand it.
Fitted loads and normally common tee in a/c but doing alot of zoned heating now on both combi and un-vented systems so just wondering if it would make a difference where we joined all the returns.