Help cold rads!!

[StuartD]

Hi,

I have just converted my old gravity system into fully pumped using this method as in diagram below:

http://www.gasman.fsbusiness.co.uk/images/yppic.jpg

It states on the diagram that the return connection from the cylinder must be the last connection.

Now my problem: I have 3 other radiators that go into the return pipe after the connection from the cylinder, and these 3 radiators wont heat up. I have turned all the radiators off and just left these 3 on but still no heat, if i disconnect the pipes from the radiators i sometimes get hot water from then, and other times i can fill 4 buckets and only get cold water.

Could it be air?

Hope someone could throw some light on my problem.

Thanks,

Stu.

 

[StuartD]

Anyone?

 

[cross thread]

cant say why they are not working at present but if you dont pipe it correctly you will get reverse circulation.making rads hot with h water only on.better off putting it right now

 

[Soggy_weetabix]

These rads should heat, with hot water on only now. The wrong way round unfortunately!

I think reverse circulation was already mentioned.

Is this DIY weekend already going wrong?

Are you sure you have not piped any flows and returns together?

A diagram of what you have done will be helpful as the diagram provided shows a close coupled o/vent cold feed configuration....which you have not followed, and probably not what you have.

What have you done with o/vent c/feed pipes, as on a gravity system the cold feed should enter on the 28mm return from the cylinder, whilst the o/vent will connect to the highest point on the cylinders primary flow?

You have not mentioned either of these pipes.

David