Operating instructions

Expansion Vessel
Filling Point
The expansion vessel is pre-charged to 0.7 bar (10 Ib/in2).
Provision must be made to be able to charge the system on
The vessel is suitable for systems up to 145 litres capacity.
commissioning and to make up any subsequent pressure loss.
For systems of greater capacity an additional expansion
The method of connection must utilise approved equipment
vessel will be required. Refer to the chart below and BS 7074
and must comply with the water regulations. A filling loop can
pt 1 or BS 5449.
be so installed as to be hidden beneath the boiler.
Pressure ’
System capacity chart
Litres
Fig. 11