Vokera Expansion Vessel 1329

The expansion vessel is a sealed diaphragm vessel used in the Vokera Linea FLOW 28 boiler. It absorbs the volume increase of the heating water as it heats and expands, keeping system pressure within the working range. Vokera supplies it under part number 1329.

• System pressure climbs steadily as the boiler heats up and falls again once it cools.
• The pressure relief valve discharges water, or the relief pipe outside the property drips during heating cycles.
• Boiler pressure drops repeatedly and needs topping up, with no visible leak on the system pipework.
• Water is heard sloshing inside the vessel when the boiler is moved or the vessel is tapped.
• The boiler locks out or cuts out on low pressure shortly after the system has been filled.

• Confirm the appliance is a Vokera Linea FLOW 28 by checking the data plate on the boiler casing.
• Check the part number 1329 against the manufacturer's parts list for your appliance.
• Compare the failed vessel with the replacement before fitting to confirm the connections and mounting arrangement match.
• Check the system charge pressure and the vessel's air charge setting against the boiler's installation instructions before commissioning.