New boiler install - Potterton pump too powerful?

[liller123]

Hi, I have recently had a new boiler put in and since it has been installed the rads rattle and bang.

The installer has changed a TRV to see if that was the problem but it made no difference.

He seems to think that the boiler pump is too strong for the system - it's a 15/60 and my old boiler had a 15/50. He also said that the pump is non adjustable so the only thing we can do stop the noise is change the pump.

Why would potterton install pumps that are too strong? it makes no sense, I'm sure that this not an unusual problem

any advice?? thanks!

 

[45yearsagasman]

If its a stand alone 15/60 then it should have a 3 speed selector switch. Tell us what boiler and system type you have, and how many rads etc.

 

[liller123]

Hi, it's a potterton combi boiler (will have to check the model later) its 28kw and we have 7 rads in total all of which have TRV's

 

[mr-crs]

Hi the pump you have isnt a great deal more powerfull than the one you had it can pump to a height of 6 metres as oppossed to 5 with your old pump have you had a conversion to a combi system from open vented?
its possible that your flow and return have been reversed this isnt always a problem unless you have one way trvs fitted,this would give you noise as you have described hope this helps Paul.

 

[liller123]

Hi, I had an old Potterton Puma combi in place before hand. The engineer said that I have bi directional TRV's

 

[steve32]

It's the same size pump on the puma and your new boiler so it's not the pump causing the problem.

 

[matt1e]

Hi, I had an old Potterton Puma combi in place before hand. The engineer said that I have bi directional TRV's

He also reckons you need a new pump!
have a look at the body of the TRV's and see if there is an arrow stamped on them

Matt

 

[liller123]

hmmm, very confused... he said that the pump was not as powerful on my old boiler (15.50) My old boiler was about 15 years old.

It's frustrating as he doesn't really have an explanation for it other than the pump being too powerful. Very irritating seeing as I just had the boiler installed and it's not something I want to "just live with" as I am sure that it's not supposed to be this way.

I'm going to call Potterton tomorrow and see what they have to say!!

 

[xr4x4]

If you open all the trvs to max, does the system still make a noise?

 

[liller123]

If you open all the trvs to max, does the system still make a noise?

To stop the pipes rattling I have to adjust the TRV to max, so no, it doesn't rattle when they are fully open. The vibrating kicks in as the TRV's are closing off.

 

[steve32]

The correct pump on a puma is a myson cp61 6m head
the pump on your new boiler is also a 6m head pump
most combi's are fitted with 6m head pumps to stop them overheating due to lack of water flow.

 

[xr4x4]

If you open all the trvs to max, does the system still make a noise?

To stop the pipes rattling I have to adjust the TRV to max, so no, it doesn't rattle when they are fully open. The vibrating kicks in as the TRV's are closing off.

Sounds like a TRV issue.

What model are they? Are they all matching?

 

[liller123]

If you open all the trvs to max, does the system still make a noise?

To stop the pipes rattling I have to adjust the TRV to max, so no, it doesn't rattle when they are fully open. The vibrating kicks in as the TRV's are closing off.

Sounds like a TRV issue.

What model are they? Are they all matching?

5 out of the seven match, we switched the TRV on the worst offending rad (the closest to the boiler) and it made no difference.

 

[xr4x4]

If you open all the trvs to max, does the system still make a noise?

To stop the pipes rattling I have to adjust the TRV to max, so no, it doesn't rattle when they are fully open. The vibrating kicks in as the TRV's are closing off.

Sounds like a TRV issue.

What model are they? Are they all matching?

5 out of the seven match, we switched the TRV on the worst offending rad (the closest to the boiler) and it made no difference.

The heads won't make a difference, it's the body's.

 

[liller123]

If you open all the trvs to max, does the system still make a noise?

To stop the pipes rattling I have to adjust the TRV to max, so no, it doesn't rattle when they are fully open. The vibrating kicks in as the TRV's are closing off.

Sounds like a TRV issue.

What model are they? Are they all matching?

5 out of the seven match, we switched the TRV on the worst offending rad (the closest to the boiler) and it made no difference.

The heads won't make a difference, it's the body's.

Hi, we changed the entire thing body and valve.

The boiler is a Potterton Performa 30 HE and I have checked the TRV's and they have 2 arrows on them so I assume that means they are bi-directional.