Supplied By www.heating spares.co Tel. 0161 620 6677
46
221474C
4 Replacement of Parts
GASKET
Diagram 4.25
FRAME
SECURING
SCREW (2)
GLASS
4606
Diagram 4.26
SCREW
TUBE
NUT
VENTURI
6366
Diagram 4.24
SECURING (2)
CLIP
(5)
LOCATION
CLIPS
CLAMPING SCREW (3)
UNION NUT
CONNECTION AND
SEALING WASHER
Diagram 4.23
UNIONS (5)
2861
6925
4.28 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 4.23. 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 4.24 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.
4.29 Burner Viewing Window
Remove the burner viewing window, secured with two screws.
When fitting a new window use the gasket provided, see diagram
4.25.
4.30 Inner Cover Case Seal
Remove the old seal, clean out the old adhesive.
Glue the new seal into place, make sure that there are no breaks
in it.
4.31 Air/Gas Ratio Sensing Venturi
Remove the fan assembly and flue collector, refer to Section 2.2.
Disconnect the tube nut and screw to release the sensing venturi,
see diagram 4.26.
