ASHP putting buffer and expansion vessel in loft?

[Spoogster]

Hi all

Our OVO heat trial design is dragging, due to the installer saying our airing cupboard 750mm x 770mm x 2.4m being too small to put a Daikin 250 l UVC, buffer, expansion and the OVO monitoring kit in.

Question: is it possible to put the buffer and expansion vessel in the loft above the UVC?. Loads of space in there and I assume it would be possible to add insulation to those items in the loft. Are there building regs issues with this idea? Looks like others have done it.

 TIA

Jason

 

[PeterW]

No issue with any of that. If you’re having a UVC in an airing cupboard where are they routing the PReV outlet to as it needs to be close to a drain. 

[Spoogster]

24 minutes ago, PeterW said:

No issue with any of that. If you’re having a UVC in an airing cupboard where are they routing the PReV outlet to as it needs to be close to a drain. 

What is a PReV outlet? We have an overflow / blow out pipe (sorry not sure exact term) already so I assume it would reuse that, but it just goes to the outside wall at first floor and not a drain

[PeterW]

Nope a Pressure Relief Valve from a tank (and usually teed with an expansion) has to run to a drain or safe location. 
 

Part G section 3.62 refers to safe discharge from a pressurised vessel.