
Supplied By www.heating spares.co Tel. 0161 620 6677
44
221474C
4 Replacement of Parts
Diagram 4.17
Diagram 4.18
MINI EXPANSION
VESSEL
Diagram 4.19
SAFETY
VALVE
CAP NUT
THROTTLE
ADJUSTER
‘O’ RING
SEALING
WASHER
PRESSURE
GAUGE
CONNECTION
SEALING
WASHER
UNION
NUT
DISCHARGE
PIPE
2794
4600
6371
4.26 Heat Exchanger
Release the water pressure and drain the central heating and
domestic hot 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 collector, refer to Section 2.2.
Remove the main burner, refer to Section 2.2.
Remove the automatic air vent, refer to Section 4.25. If renewing
the heat exchanger, transfer the air vent, using the new sealing
washers provided.
Disconnect the front gas/air ratio sensing tube, see diagram 4.20.
Make sure that no water enters the tube.
Disconnect the union nuts of the heat exchanger to remove it, see
diagram 4.20.
Reassembly Notes.
Locate the raised location tabs on the combustion chamber sides
into the slots on the heat exchanger, see diagram 4.20.
Make sure that the main burner baffle has located in the side guides
and that the burner is located on the main injector.
The combustion chamber front panel should be fitted loosely, then
the flue collector also fitted loosely, make sure that it is seated
correctly on the heat exchanger and over the top edge of the front
panel.
4.27 Combustion Chamber Insulation
Note: Before handling the insulation panels, it is advisable to
dampen them with water to prevent dusting and consequently avoid
any inhalation or skin irritation.
Remove the combustion chamber front panel secured with four
screws, see diagram 4.21.
Remove the front insulation piece, secured with a clip, see diagram
4.22.
Slide out both side insulation pieces.
Remove the burner as in Section 2.2.
Pull the lower rear insulation forward, then slide the upper rear
insulation down from behind the heat exchanger, see diagram 4.22.