UVC pressure reducing valve

[JohnMo]

Hopefully a quick question.

 

Background installing an unvented cylinder. Location is remote from the cold water manifold, preventing connection of the balanced port to the cold supply.

 

House already has a PRV just after the stop cock set at 2.5 bar.

 

Cylinder comes with a combined inlet set, set at 3 bar.

 

Can I just blank the balanced line off? 

Do I need the second PRV to comply with regs?

[Nickfromwales]

5 hours ago, JohnMo said:

Hopefully a quick question.

 

Background installing an unvented cylinder. Location is remote from the cold water manifold, preventing connection of the balanced port to the cold supply.

 

House already has a PRV just after the stop cock set at 2.5 bar.

 

Cylinder comes with a combined inlet set, set at 3 bar.

 

Can I just blank the balanced line off? 

Do I need the second PRV to comply with regs?

This falls into the realms of an UVC retro-fit. Done loads of them.

Get the PRedV at the stopcock raised to 3 bar, as at 2.5 it will be quite restrictive.

Install the control group / PRedV as per the MI's, local to the cylinder, but the one thing that all buffoons forget is to add a single check NRV to the hot outlet of the UVC.

Do that and you are 100% kosher. . Warranty will be intact with that all done.

[Nickfromwales]

If the water pressure is low, fit a 28mm single check NRV with 22mm internal reducing sets to go onto the 22mm pipe.

 

https://www.monsterplumb.co.uk/yellow-brass-fittings-plumbing-3-part-reducing-set-28mm-22mm?gclid=Cj0KCQjwuNemBhCBARIsADp74QTP_RTBfjKXlco3sqsVMfzwwNM2VZD6XPgsquJDBtCMdL0ZOrihwYYaAsvyEALw_wcB