2017 V3


Try to re-commission the vessel first:
- Discharge system pressure.
- Push in the valve and remove air pressure in the vessel.
- If water is discharged from the valve, remove the schraeder core and connect a gauge tube.
- Water inside the vessel may be condensation and not the vessel diaphragm split or leaking.
- Note: Condensation may be as much as 0.5 litre.
- To check - increase system pressure, slowly, to a max of 1.5 bar to remove any condensation in the vessel.
- If the diaphragm is split water may continue to discharge - change the vessel (see Useful Tips below).
- If the diaphragm is intact then release the pressure from the system through the drain-off.
- Renew schraeder valve core and connect foot pump.
- Re-charge vessel to 0.7 bar (cold) or manufacturers stated pressure ensuring the drain-off is open.
- Leave the foot pump attached for 5 minutes, if the diaphragm inside is split or damaged the pressure will drop, if it stays stable then the vessel is serviceable.
- Close drain-off and re-pressurise system to 1.2 bar (cold) or manufacturers stated pressure.
- Check schraeder valve with L.D.F.
Useful Tips
- If the core is seen to be leaking and it's not possible to replace it due to its position it is acceptable to fit a Flexible Valve Extension which can be left attached to the vessel as the new schraeder valve and makes future repressurising more accessible.
- When pumping up the expansion vessel if the foot pump gauge rises very quickly (after 2/3 pumps) then it is likely there is a blockage or restriction. This is more than likely to be in the pipe or hose to the vessel and replacing the vessel won’t solve this problem. The pipe/hose will need to be removed and unblocked.
- If the vessel does need replacing then consider fitting external one eliminating the need to take the boiler off the wall.
BEFORE ORDERING A REPLACEMENT EXPANSION VESSEL
Schraeder Valve Core - C33-430
Flexible Valve Extension - C00-147
Schraeder Core Remover - T02-840