Supplied By www.heating spares.co Tel. 0161 620 6677
25
221045A
4 R e p l a c e m e n t o f P a r t s
Diagram 4.18
4.23 Mini Expansion Vessel
Release the water pressure and drain the domestic hot
water circuit at the boiler, refer to Sections 1.3 and 1.6
Remove the control housing as Section 4.1.
Note. It may be possible, in some circumstance, to
remove the mini expansion vessel by hand.
Remove the multifunctional control, refer to
Section 4.15.
When refitting use the new sealing washer supplied, see
diagram 4.17.
4.24 Automatic Air Vent
Release the water pressure and drain the central heating
circuit of the boiler, refer to Sections 1.2 and 1.6.
Remove the automatic air vent, see diagram 4.18.
SLACKEN THE SMALL CAP ON THE AIR VENT.
THIS MUST NOT BE RETIGHTENED.
When refitting use the new washer supplied.
4.25 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 4.24.
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 4.18. Make sure that no water enters the tube.
Disconnect the union nuts of the heat exchanger to
remove it, see diagram 4.18.
Reassembly Notes.
Locate the raised location tabs on the combustion
chamber sides into the slots on the heat exchanger, see
diagram 4.18.
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.
GAS/AIR RATIO
SENSING TUBE
UNION
NUTS
UNION
NUTS
AUTOMATIC
AIR VENT
CAP
SEALING
WASHER
LOCATION
SLOT
4602
