Morco Products Expansion Vessel FCB1020

The EXPANSION VESSEL from Morco Products, part number FCB1020, is a sealed-system component that absorbs the volume increase of water as it heats and limits pressure swings in the heating circuit. It is listed for use with the Morco Products FEB-20E appliance. The vessel contains a flexible diaphragm or bladder separating system water from a gas charge, allowing the water side to expand without forcing the system pressure up.

• System pressure climbs quickly as the appliance heats up, then falls once it cools.
• Water is discharged from the pressure relief valve during normal operation.
• Frequent topping up of system pressure is needed to keep the appliance running.
• Water is present at the vessel's air valve, indicating a failed diaphragm or bladder.
• The vessel feels heavy or fully waterlogged when tapped, with no gas cushion.

• Confirm the appliance model is the Morco Products FEB-20E listed for this part.
• Check the existing vessel's connection size and position against the pipework on the appliance.
• Measure the space available for the vessel before ordering, as mounting clearance varies.
• Check the system's cold fill pressure and the vessel charge pressure against the appliance manufacturer's instructions before fitting.