Santon Premier Plus 210 unvented hot water cylinder with
Santon combination cold water pressure reduction/expansion valve.
External expansion vessel precharged to 3.5 bar
Cold water is dripping continuously from the combination valve (through tundish). It's not the P&T relief valve.
The expansion valve section of the combination valve has been replaced with no effect.
External expansion vessel pressure is OK.
Have tried re-charging cyclinder by following procedure:
Close off feed to combination valve
Open lowest HW tap until flow stops
Open T&P relief valve until "gurgling" stops
Re-open feed to combination valve until HW tap runs cleanly
Drip from combination valve starts immediately the feed is re-opened.
Am I right to think that the pressure-reducing section of the combination valve must be leaking? Or could it be something worse (heat-exchanger? - gulp). Is there any way to figure this out short of swapping out the combination valve?
Incoming mains pressure is about 7 bar. The installation is about 3 years old.
Thanks,
Phil
Santon combination cold water pressure reduction/expansion valve.
External expansion vessel precharged to 3.5 bar
Cold water is dripping continuously from the combination valve (through tundish). It's not the P&T relief valve.
The expansion valve section of the combination valve has been replaced with no effect.
External expansion vessel pressure is OK.
Have tried re-charging cyclinder by following procedure:
Close off feed to combination valve
Open lowest HW tap until flow stops
Open T&P relief valve until "gurgling" stops
Re-open feed to combination valve until HW tap runs cleanly
Drip from combination valve starts immediately the feed is re-opened.
Am I right to think that the pressure-reducing section of the combination valve must be leaking? Or could it be something worse (heat-exchanger? - gulp). Is there any way to figure this out short of swapping out the combination valve?
Incoming mains pressure is about 7 bar. The installation is about 3 years old.
Thanks,
Phil