New Install 12 months ago.
Greenstar 24i Boiler
150 litre unvented HW tank
Separate 25 litre wall mounted Exp Vessel, pressure ok at 3bar. (originally 12ltrs then 18ltrs.)
Pressure Reducing, Non return, Temp & Pressure relief valves etc fitted.
HW tank Thermostat, set at 45 but producing 60 at tap.
Mnfctrs Engineer has checked system ok and complies with regs.
He has variously changed the EV and PRV just in case.
The system works and we get HW & Heating.
The problem is that since installation the EV keeps going 'Bang' when a HW tap is turned on.
Its pretty certain that its the Bladder in the EV 'explosively' expanding or contracting.
However its not every time a tap is turned on. It is very irregular. Some days it happens maybe once, others it can be a number of times on the trot and all through the day.
Additionally there have been odd times when the pipe between HW tank and EV vibrated badly when a tap was turned on.
It doesn't seem to matter whether boiler is or has been on.
It even happens occasionally when no tap or any thing else is on.
The trouble is that apart from any damage its doing to the bladder, there are times when it frightens the life out of us, particulary at night when its quiet.
The Engineer has checked and changed components but cannot figure out whats causing it.
Does any one have any ideas please?
Greenstar 24i Boiler
150 litre unvented HW tank
Separate 25 litre wall mounted Exp Vessel, pressure ok at 3bar. (originally 12ltrs then 18ltrs.)
Pressure Reducing, Non return, Temp & Pressure relief valves etc fitted.
HW tank Thermostat, set at 45 but producing 60 at tap.
Mnfctrs Engineer has checked system ok and complies with regs.
He has variously changed the EV and PRV just in case.
The system works and we get HW & Heating.
The problem is that since installation the EV keeps going 'Bang' when a HW tap is turned on.
Its pretty certain that its the Bladder in the EV 'explosively' expanding or contracting.
However its not every time a tap is turned on. It is very irregular. Some days it happens maybe once, others it can be a number of times on the trot and all through the day.
Additionally there have been odd times when the pipe between HW tank and EV vibrated badly when a tap was turned on.
It doesn't seem to matter whether boiler is or has been on.
It even happens occasionally when no tap or any thing else is on.
The trouble is that apart from any damage its doing to the bladder, there are times when it frightens the life out of us, particulary at night when its quiet.
The Engineer has checked and changed components but cannot figure out whats causing it.
Does any one have any ideas please?