Looking for some advice here:
Plumber fitted a 210 litre stainless lite indirect cylinder to my system boiler. The house incoming pressure is just above 2 bar. The cylinder kit came with a combination valve and pressure vessel. The combination valve comes preset at 3 bar, although the house is less than this. The combination valve has a 22mm incoming cold water feed which is after the alkathene and double check / pressure reducing valve also set at 3 bar.
So, to the issue: The expansion vessel appears to be popping violently a few times when the hot water is heating in the cylinder and randomly in the evening. It also pops initially when the hot water tap is run.
Initially, when the tap was run, the vessel would also judder, but the plumber reduced the vessel pressure to just above that of the incoming and the judder stopped. The pop's still happen though.
He has tried evacuating any air from the water side of the expansion vessel, and has also tried various expansion vessel pressures to no avail.
Another recent thing to note is that a guy up the road also just had a Gledhill cylinder fitted (not same plumber) and his is popping in the same manner.
I thought that this may be a water pressure issue with the estate, but my plumber said that he's installed other systems at lower pressures and has never had an issue like this. So, is there anything that can be done ? Could it be a fault with the vessel or cylinder ? May it just be that the Gledhill doesn't work under 3 bar (paperwork does not give lower limit - just says works at lower pressures than 3 bar!) ?
Also, what actually causes the popping. I had read that it was a rapid deflection of the diaphragm in the vessel and I can believe that of when turning the tap on, but I would have thought that the expansion when water was heating would have been at a very slow rate.
Any expert advice appreciated.
Plumber fitted a 210 litre stainless lite indirect cylinder to my system boiler. The house incoming pressure is just above 2 bar. The cylinder kit came with a combination valve and pressure vessel. The combination valve comes preset at 3 bar, although the house is less than this. The combination valve has a 22mm incoming cold water feed which is after the alkathene and double check / pressure reducing valve also set at 3 bar.
So, to the issue: The expansion vessel appears to be popping violently a few times when the hot water is heating in the cylinder and randomly in the evening. It also pops initially when the hot water tap is run.
Initially, when the tap was run, the vessel would also judder, but the plumber reduced the vessel pressure to just above that of the incoming and the judder stopped. The pop's still happen though.
He has tried evacuating any air from the water side of the expansion vessel, and has also tried various expansion vessel pressures to no avail.
Another recent thing to note is that a guy up the road also just had a Gledhill cylinder fitted (not same plumber) and his is popping in the same manner.
I thought that this may be a water pressure issue with the estate, but my plumber said that he's installed other systems at lower pressures and has never had an issue like this. So, is there anything that can be done ? Could it be a fault with the vessel or cylinder ? May it just be that the Gledhill doesn't work under 3 bar (paperwork does not give lower limit - just says works at lower pressures than 3 bar!) ?
Also, what actually causes the popping. I had read that it was a rapid deflection of the diaphragm in the vessel and I can believe that of when turning the tap on, but I would have thought that the expansion when water was heating would have been at a very slow rate.
Any expert advice appreciated.