Air being sucked into system?

[Rybo_1]

Evening.

Arrived at a job today to change a couple of radiators and try and solve the problem where air seems to be being sucked into the system.

Ive attached a photo to show current layout. I'm thinking of either moving the cold feed to after the vent and before pump (preferred) or combining cold feed and vent as a last resort. The pump sounds very airy and the customer is having to vent all the upstairs radiators monthly.

There is a small leak on one radiator. One that I am changing tomorrow. This is an old cottage

any advice on the problem would be very much appreciated.

 

[Rybo_1]

 

[iain85]

If you can get the cold feed into the right place (like you suggested)that would be a start. What boiler is In there?

 

[Rybo_1]

Worcester bosch about a year old with a magnaclean on it

 

[Rybo_1]

30cdi

 

[PhoenixServices]

Get the cold feed in the right position. Failing that put a sealed system in (check there is no pipe work in solid floors and have a disclaimer written up saying you won't cover old pipe work)

also looks like something has been leaking above/on the 3-port valve

 

[tamz]

Lovely

 

[Rybo_1]

Sealed system not really an option here. Downstairs heating circuit all in screed and its an old system, I reckon it would pop in numerous places.

 

[Rybo_1]

Update;

I decided to see if combining cold feed and vent would make it run any better. Seems to have worked, pump was running super quietly and a day later the customer is really happy!