radiators getting warm when only hot water required

[Quickpete]

Hi, I am getting hot rads when the boiler is set to supply only hot water to the tank.
The electronic valves are working correctly.
It appears to be syphoning back through the system on the return to the boiler.
Question: can I fit a 22mm non return valve into the return pipe which comes back from the radiators, or will this overwork my circulating pump or impede the flow to much??????????????????

Thanks for your help

 

[bengasman]

If it was working ok before, changing the system is obviously not the answer; you need to find the problem and remove it, not fight the symptoms.

 

[Quickpete]

Thanks for that info. The system has been altered and the boiler moved. I am just now trying to rectify this one small problem. I have only noticed it since the weather became warm and the heating was no longer required.

 

[picasso]

You can fit a check valve to stop the reverse circulation..the trick is knowing where to fit it.

 

[kevplumb]

trick is not to baals it up in the first place

which is where a good installer comes in handy

 

[bengasman]

Thanks for that info. The system has been altered and the boiler moved.

In that case you certainly should not diy it. Get the installer back to rectify what he did wrong.

 

[Foobix]

Tell the installer to make the hot water return connection as close to the boiler as possible.

 

[bengasman]

Tell the installer to make the hot water return connection as close to the boiler as possible.

And if it doesn't solve the problem, the installer says: " you told me to do this and it didn't work, you'll have to pay for the rest of the work".

NEVER tell an engineer how to do his job.

 

[Foobix]

Ben,you are full of it!
Why wouldn't it work?
It's either the zone valves or the location of the hw return connection.
And,as Pete clearly states that the valves are okay,and by my theory of deduction,leaves only one suspect.
When you have eliminated the impossible, whatever remains, however improbable, must be the truth my dear boy!

 

[bengasman]

Ben,you are full of it!
Why wouldn't it work?

Blockage, some sort of restriction, faulty valve or whatever.
Simple fact of the matter is: you tell me to do X, you pay me to do X, whatever the result.
You don't like that principle, you shut up and let me do my job; it's that simple.

 

[Foobix]

You tell me to shut up?
You get the f@%k out my house before i throw you out!
Blockages normally prevent circulation where i come from,stop giving me excuses and pack your tools up sonny!
Your fired!