Reverse circulation

[Stuzzy77]

Hi,
I've got a y plan system which was working fine until the pump failed. I drained the system which was sludgy and replaced the pump. The radiators are now heating up on a hot water demand even after replacing the 3 port to try and cure it.
Considering reverse circulation wasn't a problem until the pump failed can a partial blockage
cause this issue. The f&e pipes tee in before the pump ok and there's no pipes after the cylinder return.
Ani ideas?

 

[holty]

sounds like you just need to keep googling your problem till you get it right. because you dont have a clue at what reverse circulation really is. google it

 

[Razor900]

Which way is the arrow pointing on the pump. Towards the 3 port or away?

 

[Stuzzy77]

Which way is the arrow pointing on the pump. Towards the 3 port or away?

Arrow on pump pointing towards 3 port and the diverter valve A heating and B hot water:

 

[hertsboilers]

http://www.hertsboilers.co.uk/blog.htm#3

What is reverse circulation?

 

[hertsboilers]

More likely a let by the middle position valve.

 

[PullerGas]

Hi,
I've got a y plan system which was working fine until the pump failed. I drained the system which was sludgy and replaced the pump. The radiators are now heating up on a hot water demand even after replacing the 3 port to try and cure it.
Considering reverse circulation wasn't a problem until the pump failed can a partial blockage
cause this issue. The f&e pipes tee in before the pump ok and there's no pipes after the cylinder return.
Ani ideas?

The HW cylinder return should be the first tee on the common return to the boiler.

 

[lastmuffininbrussels]

More likely a let by the middle position valve.[/QUOTE

+1

 

[AGAS]

did you change just the head or whole valve ?