Expansion Vessel - Worcester GREENSTAR 24i Junior Installation Instructions Manual

SERVICE AND SPARES

6.8.30 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)
B Isolate mains power from the boiler.
B Lower the control panel to the service position.
B Isolate the boiler from the heating system (and
cylinder return if internal diverter valve is fitted) using
service valves.
B Drain the boiler.
B At the pump manifold, release the clip and disconnect
the expansion vessel hose.
1.
Fig. 125 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.
B Remove the flexible hose from the expansion vessel
and fit to the replacement vessel using a new seal.
B Reassemble expansion vessel into wall frame and
reconnect the flexible pipe to pump manifold and
secure with the clip.
64
2.
Expansion vessel replacement (Removing the Boiler)
B Isolate electrical supply.
B Isolate system and gas connections at the service
valves.
B Drain the boiler.
B Disconnect electrical supply and any external
controls.
B Disconnect flue connection from the boiler.
B Undo connection to boiler at the service valves.
1.
Fig. 126 Removing expansion vessel from wall frame
B Release the clip from expansion vessel connection to
the pump manifold.
B Carefully lift the boiler off the mounting frame.
1. Remove the expansion vessel retaining screw.
2. Lift the expansion off the cross beam.
3. Pull the expansion vessel towards you to remove.
B Replace expansion vessel in the reverse order and
refit the boiler to the mounting frame.
B Follow the commissioning procedure in this manual.
6 720 644 741a (2010/10)
2.
3.