Supplied By www.heating spares.co Tel. 0161 620 6677
27
221045A
4 R e p l a c e m e n t o f P a r t s
Diagram 4.22
4.27 Expansion Vessel
Renewal of the expansion vessel requires the boiler to be
removed from the wall. As an alternative, a separate
expansion vessel of the same specification may be
connected as close as possible to the boiler, leaving the
original in position, refer to Section 4.5 in the
Installation Instructions.
Release the water pressure and drain the central heating
and domestic water circuits, refer to Section 1.3 and 1.6.
Remove the fan from the flue collector, refer to
Section 2.2.
Remove the flue elbow, refer to Section 10 of the
Installation Instructions.
Disconnect the boiler water connection union nuts at the
front of the isolating valves, see diagram 1.1.
Disconnect the gas service cock union.
Disconnect the safety valve discharge pipe from the
boiler, see diagram 1.1.
Separate the two parts of the boiler multi-pole
electrical connector.
Slacken the clips of the gas service cock and the water
isolating valves.
Remove the boiler from the mounting frame, secured
with two screws at the top, see diagram 4.21. Pull the
boiler from the isolating valves. Unhook the boiler at
the top and lift off.
Carefully lay the boiler down on its side for access to the
expansion vessel.
Disconnect the union nut connection, see diagram 4.22
and discard the sealing washer.
Remove the expansion vessel, secured with three
clamping screws.
Connect the union nut, when fitting the expansion vessel,
before clamping it.
SECURING (2)
CLIP
(5)
LOCATION
CLIPS
CLAMPING SCREW (3)
UNION NUT
CONNECTION AND
SEALING WASHER
Diagram 4.21
UNIONS (5)
2861
4605
