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Buzzing noise from UFH manifold

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(@novemberromeo)
Estimable Member Member
62 kWhs
Joined: 3 years ago
Posts: 33
Topic starter  

Our heat pump was installed in November 21 and was connected to our existing UFH system. All has been working well, but in the last week or two I’ve noticed a loud buzzing noise coming from the UFH manifold when the kitchen is calling for heat. 

it’s a strange noise, it reminds me of an old dot matrix printer printing. I’ve uploaded a clip so you can hear what I mean:

https://youtube.com/shorts/F5N6KFYcJw8?feature=share

does anyone have any ideas what is causing the noise, and what I should do to stop it? As far as I can tell, the heating is still working as normal  

i’ve discovered that turning the flow rate valve on the kitchen supply does temporarily stop the noise, but when I put it back to the original position the noise starts again after a short while. 


   
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(@allyfish)
Noble Member Contributor
3206 kWhs
Joined: 2 years ago
Posts: 383
 

Wow! ASHPs need to deliver more flow than conventional fired boiler heating systems, as they operate a much lower delta T supply and return temperature. For many retrofits, including wet rad and UFH, that usually means the existing piping system ends up with higher velocities than before. Velocities above certain speeds will start to generate audible noise. It's not normally practical to increase the piping sizes for retrofits, so you may have to adjust some flow rates to stop noisy valves and pipework where the flow is higher.


   
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(@novemberromeo)
Estimable Member Member
62 kWhs
Joined: 3 years ago
Posts: 33
Topic starter  

That makes sense, but I don't see why it would only start making a noise now - 14 months after installing the system.  Up until now it's been running fine without any noise.  I was wondering whether it could be the sound of air in the system, or something like that? Maybe that is a non-issue for these systems?  We have no radiators, UFH throughout.

This post was modified 1 year ago by novemberRomeo

   
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(@allyfish)
Noble Member Contributor
3206 kWhs
Joined: 2 years ago
Posts: 383
 

Maybe a bit of wear and tear? Bleed the system of air, it's not something you want in the system. I have one TRV that quietly 'sings' when it modulates down, and it's in our bedroom!!


   
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(@derek-m)
Illustrious Member Moderator
14001 kWhs
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Joined: 3 years ago
Posts: 4203
 

Posted by: @novemberromeo

That makes sense, but I don't see why it would only start making a noise now - 14 months after installing the system.  Up until now it's been running fine without any noise.  I was wondering whether it could be the sound of air in the system, or something like that? Maybe that is a non-issue for these systems?  We have no radiators, UFH throughout.

You have partially answer the question yourself, in that it has been working fine for 14 months without making any noise, so I don't think that the actual pipework may be at fault.

Is the noise coming from the flow regulation valve or the valve associated with the solenoid valve?

I am not that familiar with UFH systems, but it sounds like it could be some debris inside the valve or some part of the valve internals is working loose.

Is it still under warranty?

 


   
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