Do I need to add a vent?

Joined
6 Dec 2009
Messages
45
Reaction score
0
Location
Nottingham
Country
United Kingdom
I have replaced my poorly installed gravity system with a new Y Plan fully pumped system.

The Problem: When the HW system is on it is quite noisy, with the sound of water rushing around the pipes. I am assuming that this is caused by trapped air.

I think my layout is wrong and I need to add a vent pipe to the 28mm tank inlet running to the CH expansion/feed tank in the loft.

Here is what I have currently with the proposed pipe (in orange).

Is this correct?


[Edit] The initial image in the post was wrong, the CH upstairs now runs direct to the boiler rather than teeing into the HW return. Don't think that affects this post 's problem though.
 
Sponsored Links
Joined
2 Oct 2010
Messages
3,625
Reaction score
664
Country
United Kingdom
Put an auto air vent or manual type.

Dont run the open vent from there.

Mr. W.
 
Joined
1 May 2010
Messages
206
Reaction score
22
Location
Powys
Country
United Kingdom
Open vent needs to be between the boiler and the pump so dont move it

Manual air bleed might sort it out
 
Sponsored Links
Joined
28 Jan 2005
Messages
34,181
Reaction score
3,139
Location
London
Country
United Kingdom
Once the air is out of the system, there should be no need for a vent. If there is, you have another problem and letting the air out is only solving the symptoms, not the actual problem.
 
Joined
6 Dec 2009
Messages
45
Reaction score
0
Location
Nottingham
Country
United Kingdom
Once the air is out of the system, there should be no need for a vent. If there is, you have another problem and letting the air out is only solving the symptoms, not the actual problem.

Don't think there is a problem. The air in the system has been there since since I filled it for the first time. It doesn't seem to be working its way out.

Please correct me if I'm wrong, but I was expecting the air to eventually work its way out, if it can get to the boiler then it should work its way back up the feed/vent or into the rads. Its just not making it back to the boiler. Does that sound sensible?
 
Joined
28 Jan 2005
Messages
34,181
Reaction score
3,139
Location
London
Country
United Kingdom
In theory, you are right. In reality, many open vent systems do not what they should do.
OV is great from a business point of view, but I wouldn't have one in my own house.
I suspect your system suffers from corrosion and as a result draws air in.

If it is purely a matter of one time air not coming out, the easiest way to solve it would be to undo a compression joint at the top of the dhw loop just enough to let the air out after the system has been off for an hour.
 
Sponsored Links
Top