Vibration transference from wall mounted ASHP?

[MikeMc]

Hello, I hope to have a Daikin EDLQ 07 CV3 Monobloc installed on wall brackets at first floor height on a cavity (filled) wall at back of house. My concern is whether vibration transference is likely to be a problem. I have read that anti vibration mounts may be used and I would like to hear from anyone who has experience of fitting / using these devices, which type and how effective they are please.

Mike McMillan

[SteamyTea]

What is the wall made from, is there a cavity?

[MikeMc]

It is a conventional 1930’s brick wall with the cavity filled with insulating foam beads.

Regards,

Mike

[SteamyTea]

Should be alright.

Nothing mechanical is silent, but millions of places have air conditioning units bolted to walls.

The thermal transfer pipework needs to be flexible and the correct length. The manufactures usually state this.

There are some ruled about how close they can be to windows and neighbours. Worth checking them out.

 

[MikeMc]

Thank you SteamyTea; Octopus Energy are my preferred MCS registered installers and they are holding fire on ‘working at heights’ installations at present but will supply me with a full report in due course when they are ready to proceed. Large loops in flexible hoses will be used you can be sure. I am just being cautious about the vibration aspect (must be my background in acoustics:-) ) The house is close to the A3290(M) and ambient noise is very unlikely to be a problem as the traffic will easily be 20dB above any sound emanating from the pump (sigh) so my only concern is vibration.

Regards,

Mike

[markc]

Anti vibration mounts are used extensively in fridges, air con etc. They are simple rubber blocks with a stud or threaded hole on each end. 
no idea what the unit suppliers charge for them but very low cost on eBay or RS components (rare I can say that)

[MikeMc]

I know just what you mean markc, I used to have an account with them but only used them for speed or convenience usually. I am wondering whether using the anti-vibration blocks to stand the ASHP on could be supplemented with isolation for the brackets from the wall by interposing a/v mounts here too; I am not sure whether the lateral loading could be handled by any design of isolator. Usually the damping is applied by compression of the rubber block in a downward direction - hanging bracket loading would be very different.

Regards,

Mike

[SteamyTea]

2 minutes ago, MikeMc said:

could be supplemented with isolation for the brackets from the wall by interposing a/v mounts here too

Run the risk of resonance being set up.

 

[markc]

6 minutes ago, SteamyTea said:

Run the risk of resonance being set up.

 

+1, I would fix brackets solid and float the unit

[Bonner]

Just bought some anti-vibration mounts for my MVHR from https://www.vital-parts.co.uk/anti-vibration-708-c.asp. They have a decent range but not installed yet so can’t vouch for the product or my mounting!

[MikeMc]

Please report back Bonner when they are fitted and (hopefully) doing the job. SteamyTea and markc, thank you for that - don’t want no resonances not nowhere, not no how, not never!

Regards, Mike

[Nick Laslett]

@MikeMc, any update on how this went? I see most wall mounts come with rubber washers for the ASHP unit.