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Post by rocketmanbkk on Nov 17, 2021 17:26:24 GMT
Hello
A couple have an unvented cylinder with system boiler.
In the morning if they open & then close the cold tap it bangs.
If they open the hot first & then the cold it’s silent.
The cold is mains fed to all cold outlets.
Any thoughts on this please?
Cheers all
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Post by tomplum on Nov 17, 2021 20:54:02 GMT
The cold is mains fed to all cold outlets.
that might be the problem rocky, its not piped up correctly, the cold mains should go to the balancing/blending valve, then to the cold taps with the exception of the kitchen sink,
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Unvented
Nov 18, 2021 7:31:36 GMT
via mobile
Post by dickpuller on Nov 18, 2021 7:31:36 GMT
Fairly common problem with UVCs Rocky.
Like most noises in Pluming systems, it’s pressure related.
Check all Pressure Reducing Valves & check the air pressure in the Potable EV.
It should be; Working water pressure x .9 = Vessel air pressure.
Most PRVs are set at 3 Bar.
The Inlet Group is also worth checking.
I take it you’ve a G3 Ticket?
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Post by rocketmanbkk on Nov 18, 2021 7:48:10 GMT
Fairly common problem with UVCs Rocky. Like most noises in Pluming systems, it’s pressure related. Check all Pressure Reducing Valves & check the air pressure in the Potable EV. It should be; Working water pressure x .9 = Vessel air pressure. Most PRVs are set at 3 Bar. The Inlet Group is also worth checking. I take it you’ve a G3 Ticket? I’ve not touched it but wanted to advise her. I’ve seen them piped up this was before with all cold mains fed & never an issue. |
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Post by crowsfoot on Nov 18, 2021 21:54:54 GMT
A faulty pressure reducing valve on the incoming mains (going to the cylinder) is by far the most common cause of this kind of noise on unvented systems (if it's like a couple of distant "knock knock" noises?)
If it's a "drrrrrrrrrr drrrrrrr" noise then I'd go for a faulty tap insert (hot kitchen tap being the #1 favourite) and nothing to do with the unvented system.
Could be anything really but above is the most popular cause's of noise that I find day to day.
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Post by rocketmanbkk on Nov 19, 2021 13:40:24 GMT
A faulty pressure reducing valve on the incoming mains (going to the cylinder) is by far the most common cause of this kind of noise on unvented systems (if it's like a couple of distant "knock knock" noises?) If it's a "drrrrrrrrrr drrrrrrr" noise then I'd go for a faulty tap insert (hot kitchen tap being the #1 favourite) and nothing to do with the unvented system. Could be anything really but above is the most popular cause's of noise that I find day to day. Cheers Yes it’s a bang when it closes |
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