@jamespa installer said today "Yeah unfortunately thay is not going to help with vibration. They aren't anti vibration clips and/or the pipes been wrapped or insulated." after seeing part of the 28mm runs that i could find in my photo's, i have since explained that the pipes are insulated and this pic just shows part of the run of 28mm that wasnt yet finished.

Posted by: @adamk

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this pic just shows part of the run of 28mm that wasnt yet finished.

yes but they are presumably insulated over the clips (unless you removed the clips and refixed them before insulating) so are hard against the rafters.

Could be transmitting noise indoors.

Whats the next step or have you accepted it as it is?

@jamespa if I remember the insulation has a notch cut in it so it goes over the pipe and either side of the joist.

Posted by: @adamk

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@jamespa if I remember the insulation has a notch cut in it so it goes over the pipe and either side of the joist.

But presumably leaving the clips, visible in the photo, in place this providing the opportunity for vibration transfer 

@jamespa yes I guess. But surely not everyone is buying special anti vibration clips? My plumber (who has worked on large scale renewable stuff in a previous job) didn’t suggest them.

today during its eco hw run I had a listen and found even in this mode some noise in the utility which is 4m away, could feel it ever so slightly by touching the ceiling where the pipes are. Also found if I put my ear to the French door double glazed unit, that’s about 1m away from the outside hp, it was rather noisy bit like the sound you get when running a tap that’s got narrow internals.

flow rate is 750. So about right.

Posted by: @adamk

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But surely not everyone is buying special anti vibration clips? My plumber (who has worked on large scale renewable stuff in a previous job) didn’t suggest them.

I'm sure you are right, I was just trying to understand what you had.  That said I'm pretty sure most if not all of the 5m or so of 28mm primary I have is clipped around the insulation this isolating it, I guess a feature of it being a retrofit.

A tap with narrow internals sounds more like an air lock problem than the compressor.  I do think you might benefit from taking sides and top off of the odu to confirm the origin of the noise.  Sometimes simply putting a hand on a vibrating component steadies it and highlights the issue.   Of course due care needed if machne operated without cover. 

Or post a recording

@jamespa the only other thing ive wondered is why when the installers guy was fitting the auto air bleed he seemed to curse as if he'd fitted it to the wrong pipe. looking it seems i have one on both primaries, should it be one and only on the return or flow from the heat pump?

@adamk my system has on on flow and return at highest point above expansion tank, and 3 others on other pipes in the system room

@adamk mine is on a vertical spur off of the cylinder pipework (the cylinder is on the first floor).  Not sure whether its feed or return but here its not going to matter.  I guess the logic was that all the water in the system passes this point, and its high up, so air will collect. 

It mostly works, but I have two tall radiators that needed manual bleeding because some air also collected in these.  One in particular took a full month of near-daily bleeding to clear.  There is lots of dissolved air to come out from 200l of water!

I have UFH downstairs and 3 rads and towel rail upstairs, the gas boiler used to be upstairs so it had the air bleed system with it.

ive had the system nearly a year now and have checked the upstairs rads but found no air collecting there; which i suppose is long enough for the air to purge.

There are more air valves on the DHW circuit and the UFH circuit, I thought at the time it was OTT of Octopus but ive had no issues with the system after the first few weeks when it kept falling over for a blocked filter; that took Octupus 5 visits to correctly diagnose and 2 weeks to fix it

@adamk  I am trying to follow the 10 pages:) but probably got lost. I thought my installation was bad, but your seems worse. In my case I overpaid by quite a bit, and got a system that just under delivers and is not fit for purpose, worst case is that I no longer have access to do any pipework, so whether the heat pump can actually deliver and has the flow, who knows.

Have you managed to have anyone look at the system and actually tell you what is wrong with it? Do you have a full list you can compile that states, this is what I am not happy with or what I think it is wrong.

@drei I’ve not been able to find a local installer let alone someone who can pop round to have a look. I think I might be the only Vaillant 7kw in a 20 mile radius. My issue, after they finally sort the breakers out in October (only 3 months of chasing), will be hopefully only be the humming noise which whilst drives me nuts I would think is fixable even if I have to get the primaries run around the outside of the house and abandon the ones in the ceiling.