Also forgot to add that I checked the pressure on the air side of the expansion vessel and it measured 22 psi which is 1.5 bar. This agrees with the pre-charge details on the side of the vessel.
So far the system has only been run on cold as the gas has not been connected to the boiler yet.
Also forgot to add that I checked the pressure on the air side of the expansion vessel and it measured 22 psi which is 1.5 bar. This agrees with the pre-charge details on the side of the vessel.
So far the system has only been run on cold as the gas has not been connected to the boiler yet.
That sounds awfully high to me. The usual rules of thumb are these:
The water pressure when cold needs to be *higher* than the air charge pressure, so that the air in the expansion vessel is further compressed a bit when the water system is pressurised. If this is not so, it only needs the slightest leak - or a bit of air bled out - in the water system for all pressure to be lost. If the cold pressure is too high, there's not enough margin for expansion before the safety valve blows.
I thought extactly the same - I will normally recharge an expansion vessel (remembering to keep an open end) to around 0.7 bar, then water pressure cold: 1bar - 1.5 bar, depending upon boiler.
Angus
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