Expansion Vessel - Worcester GREENSTAR 24i Junior Installation, Commissioning And Servicing Instructions

6.8.31 EXPANSION VESSEL

The expansion vessel can be replaced with the boiler in position if there
is a side exit flue fitted and a minimum clearance of 340mm above the
boiler casing. If a vertical flue is fitted then a similar clearance to one side
of the flue is required.
If this clearance is not available, then the boiler will need to be removed
from the mounting frame to gain access to the expansion vessel.
Alternatively a second vessel of at least the capacity of seven litres can
be fitted to the return from the heating system as close as possible to the
boiler.
Expansion vessel replacement (Boiler in place)
▶ Isolate mains power from the boiler.
▶ Lower the control panel to the service position.
▶ Isolate the boiler from the heating system (and cylinder return if
internal diverter valve is fitted) using service valves.
▶ Drain the boiler.
▶ At the pump manifold, release the clip and disconnect the expansion
vessel hose.
1.
Fig. 134 Removing the expansion vessel
1. Remove screw (1) retaining the vessel to the top of the boiler casing.
2. Pull the vessel up (2) and out over the flue system or to one side if
fitted with a vertical flue.
▶ Remove the flexible hose from the expansion vessel and fit to the
replacement vessel using a new seal.
▶ Reassemble expansion vessel into wall frame and reconnect the
flexible pipe to pump manifold and secure with the clip.
Expansion vessel replacement (Removing the Boiler)
▶ Isolate electrical supply.
▶ Isolate system and gas connections at the service valves.
▶ Drain the boiler.
▶ Disconnect electrical supply and any external controls.
▶ Disconnect flue connection from the boiler.
▶ Undo connection to boiler at the service valves.
6 720 802 047 (2013/05)
2.
1.
Fig. 135 Removing expansion vessel from wall frame
▶ Release the clip from expansion vessel connection to the pump
manifold.
▶ Carefully lift the boiler off the mounting frame.
1. Remove the expansion vessel retaining screw.
2. Lift the expansion vessel off the cross beam.
3. Pull the expansion vessel towards you to remove.
▶ Replace expansion vessel in the reverse order and refit the boiler to
the mounting frame.
▶ Follow the commissioning procedure in this manual.
SERVICE AND SPARES
2.
3.
51