Not off the top of my head mate. But mould start with building regs g3.
Leave it with me and I will see what I can find
Leave it with me and I will see what I can find
Welcome to the forum. Although you can post in any forum, the USA forum is here in case of local regs or laws
Read me hypothetical post Shaun 🙂
I said after where there tee’d, thus a blockage before the D1, not trying to play Devils advocate too much!
That’s why I said Hypothetical, worst case etc 😀
Imagine if it was blocked, can you see what i’m trying to say about backflow, x-contamination etc?
Remember the water regs about disconnecting filling loops after topping up systems to prevent backflow.
Which i’m sure we all disconnect 😉
The inlet valve has a NRV inside so no chance of cross contamination.. also there is an air gap via the tundish so again, not much chance of backflow.. also the likelihood of a blockage is pretty much slim to never..Okay guys thanks for the swift response i’ll Check back up as I was led to believe it contraves water regs as it could lead to cross contamination of potable water supply with heating water discharge.
(Hypothetical , worst case scenario, I know Lol) I.e blockage after where both pipes are tee’d in, heating system then discharges at 3 bar, then passing expansion relief valve at cold water inlet group could lead to backflow into cold water supply.
Well I’ll be...Hi Guys,
Update for anyone that is still interested, or has the will to live!
I’ve spoke to one of the tech advisers at the CIPHE and he’s said G3 regs only cover the potable water discharges into D1 & D2, and not the discharges from central heating. Therefore you shouldn’t combine them.
I then asked him where it says in any doc or reg that you cannot do it, and he basically said if an incident happened (I.e flood from tundish causing water damage due to all discharges blowing off at same time or others etc) and it went to court then the expert witness’s would pull out the G3 discharge drawing (the one that’s in all u/v cylinder install instructions) and then basically say show me on that drawing where it shows that the central heating blow-off is allowed to be connected into the D1/D2 pipework.
As we all know the drawing shows no such thing.
Hope this helps anyone out in the future.
Cheers.
Totally hear you, but it also does not state that it cannot be connected to a CH PRV. So it’s kind of down to interpretation in my eyes. In an u/v cylinder manual I believe it will only discuss the discharge from that appliance, and not others ie central heating so the drawing will only display that of the u/v discharge pipework.Hi Guys,
Update for anyone that is still interested, or has the will to live!
I’ve spoke to one of the tech advisers at the CIPHE and he’s said G3 regs only cover the potable water discharges into D1 & D2, and not the discharges from central heating. Therefore you shouldn’t combine them.
I then asked him where it says in any doc or reg that you cannot do it, and he basically said if an incident happened (I.e flood from tundish causing water damage due to all discharges blowing off at same time or others etc) and it went to court then the expert witness’s would pull out the G3 discharge drawing (the one that’s in all u/v cylinder install instructions) and then basically say show me on that drawing where it shows that the central heating blow-off is allowed to be connected into the D1/D2 pipework.
As we all know the drawing shows no such thing.
Hope this helps anyone out in the future.
Cheers.
I think your having trouble interpreting the regs Shaun, so you just carry on as you are. If you need clarification from people more intelligent than me and who can explain better than me then please ring CIPHE tech for assistance 😉
Tried to help by doing some proper research so I hope it can be of use to others.
Thanks again.
Reply to the thread, titled "My first cylinder install with boiler" which is posted in Boiler Advice Forum on Plumbers Forums.
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