Bungs question.

[holty]

sounds like a wierd setup. basically im assuming your system is fully pumped.due to the fact when you dont want heating the 2 port closes.but hot water is still being pumped without any controls except boiler stat.sounds like an old gravity conversion gone wrong.id put the second zone valve(now s plan) after the vent and feed. otherwise problems.

 

[vectraguy]

sounds like a wierd setup. basically im assuming your system is fully pumped.due to the fact when you dont want heating the 2 port closes.but hot water is still being pumped without any controls except boiler stat.sounds like an old gravity conversion gone wrong.id put the second zone valve(now s plan) after the vent and feed. otherwise problems.

Hello holty, thanks for your comments, and mine is the first system on this page
http://www.diyhowto.co.uk/projects/open-vented-heating.htm

Regards vectraguy.

 

[doitall]

sounds like a wierd setup. basically im assuming your system is fully pumped.due to the fact when you dont want heating the 2 port closes.but hot water is still being pumped without any controls except boiler stat.sounds like an old gravity conversion gone wrong.id put the second zone valve(now s plan) after the vent and feed. otherwise problems.

Hello holty, thanks for your comments, and mine is the first system on this page
http://www.diyhowto.co.uk/projects/open-vented-heating.htm

Regards vectraguy.

Interesting link, whoever designed it got the pump in the wrong place

If you have gravity primaries, you can't stick a valve on the flow, the return is ok if you follow the Honeywell plan.