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[Solved] Daikin Altherma noisy heat pump - help and advice needed

Clairelp · 2024-02-23T20:43:52Z

Hello, We recently had a Daikain altherma 11kw heat pump installed. We are happy with how it’s heating our home and the costs, but I hate the thing due to the noise in our bedroom. When we had our original survey for the heat pump, we were told we would not hear it indoors. I thought I would hear it in the lounge, as you can see it’s next to French doors. However, it isn’t a problem in the lounge as much, but the noise is so annoying in our bedroom. When it’s turned off, it’s such a relief, and I can’t sleep with it going. I'm not sure if it’s from the unit or the flow and return. It’s about 25-30 decibels inside the room. While it is quieter than our old oil boiler, the oil boiler was in our utility room, so we didn’t hear it, and it was only noisy on start up where as the heat pumps run a lot, especially in winter. And this is on the bedroom wall. So in the evening, I try to get our toddler to sleep, and it drives me mad. While we do live in quiet location but we do live next to a military air base so we are used to noise, but this is just annoying constant noise. Turn it off; it’s like being out of a loud bar and being relieved to have peace when it’s off. In picture red I marked is bedroom and where bed is. Any advice? I would be very grateful. if anyone managed to reduce sound. We had to use our savings to buy it so don’t really want to find money to replace it and going green was and is important to us. Thank you

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Clairelp

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Topic starter 27/02/2024 1:00 pm

Sorry don’t think pictures attached

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Clairelp

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Topic starter 27/02/2024 1:02 pm

Under this is my bedroom wall, I think the noise is from here somewhere. Do these vessels make noise?

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KenBone

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27/02/2024 1:27 pm

@clairelp finally I can see that you have a volumiser, not buffer setup. So there should be not extra pumps on the system. The pump built into the Daikin is quite strong, I can't see a bypass (but it's hard to tell with the quality of pictures)

This is what they look like, it maybe in the airing cupboard, do you TRVs on every radiator.

Does the noise stop when doing hot water.???

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KenBone

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27/02/2024 1:58 pm

@clairelp only if they don't have enough water in them, system what's the pressure gauge reading.

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KenBone

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27/02/2024 2:01 pm

@clairelp there should be an air release valve behind

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Sune

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27/02/2024 2:34 pm

@clairelp I'd expect the primary pipes - which is the ones that connect your heat pump to to the volumiser, to that black and red Esbe valve, and to any manifolds or branching off in your cupboard, to be at least 28mm diameter. From the pictures it looks like they >may< be 22mm? It's hard to tell though.

Apologies - I've forgotten the output of your heat pump..... There's a limit to how many kWhs you can get down each diameter pipe to not go over 0.9 - 1m/s velocity. For 22mm the limit is around 6kW. For 28mm it's more like 10kWh. * Could you please check what the diameter of the pipes going to your volumiser are please? The volumiser is the small gray tank thing in the attic.

Did you then say that each pipe heading off around the house is 10mm? You can get around 1kW down each one of these to not go over 0.9 - 1m/s velocity.

The reason you would want to keep to that velocity limit is it tends to get noisy above it. Also much above 1.5 and it starts to erode the internal of a copper pipe.

As Ken and others thought previously the pipe clips attach the pipe directly to the wood in your attic. An alternative would be to use a clip that goes to the outside of the insulation material. There is a brand called "Primary Pro" that is a favourite with heat pump installers. As you have a cold attic I'd advise consider this a cold space and upgrading the insulation up there - you'll save money in the long run.

Ken's suggestion to check the air vent is a good one too.

*These numbers assume you have glycol in your system, and that the dT of your heat pump is 5. dT means the delta T - it stands for the temperature difference between the hot pipe from the heat pump and the cold one. Delta means "difference" in Latin. As dT increases you can get more and more heat down a pipe within that velocity limit.

Planning your dream house? Book a simple one-to-one consultation to get you on a good path - here.

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Clairelp

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Topic starter 27/02/2024 3:02 pm

Thank you for looking at pictures for me. I cannot see one, but will get husband to look.

the two heated plumbed towel rails are the only radiators without a trv

no still noisy with water heating in fact probably worse. It’s at its noisiest probably when doing water and that frost cycle.

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KenBone

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27/02/2024 3:12 pm

@clairelp here is the bypass valve

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KenBone

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27/02/2024 3:13 pm

This is the filling loop and gauge.

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KenBone

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28/02/2024 6:03 pm

@clairelp

What's been happening ?

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Clairelp

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Topic starter 28/02/2024 6:14 pm

@kenbone

Hi, we not had chance to get in the loft to look at the valve yet, difficult to go up in loft making noise when children asleep in the evening.

I did look at pressure gauge in cupboard and it about 1.6.

Friday installers are coming so I will keep you posted. We also have installers msc compliance department checking the install following week. Hoping they will have an answer 🤞🙏

the ashp does have anti freeze valves, with it not been below freezing hoping be okay to keep turning off for a couple of nights.

also looking into sound proofing and insulation for the loft.

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Clairelp

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Topic starter 01/03/2024 3:04 pm

Hi,

Installers, have turned down the velocity to I think he said 21-22 and was previously 24. Think he said in the bypass valve. And I sorry can’t remember exactly but I think he said like it around 21 and maybe 24 was making too much noise.

At moment, I don’t think I could hear it and running quieter, it’s only just done so I will test it later when doing hot water and have to wait for a cold night.
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They also did some settings on the frost cycle. They said it shouldn’t be coming on when not cold enough and shouldn’t be constantly going. Said there is two defrost settings one I think he said for the pipes and one for actual pump. They said if changes didn’t help they will contact Daikain, as some setting they can’t change.

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