Technical data

21
side. Replace in the reverse order, ensuring that
all seals and insulation panels are undamaged
and in good condition.
6.20 EXPANSION VESSEL (fig. 1)
Due to the compact design of this appliance,
removal and/or replacement of the expansion
vessel may require the appliance to be removed
from the wall, if this is deemed impractical, an
external expansion vessel may be fitted to the
return pipe as close to the appliance as possible.
6.20.1 EXPANSION VESSEL (removal, fig. 28)
Carry out component removal procedure as
described in section 6.4.
Disconnect the flue from the appliance.
Disconnect the expansion vessel from the
expansion pipe.
Remove the flow sensor as shown in section 6.9.
Locate and remove the 4 screws.
Remove the rear frame.
Slacken the flow pipe nut: the expansion vessel
can now be removed shifting the flow pipe on the
left side.
Replace in the reverse order. Ensure all seals are
in good condition, taking care to ensure they are
replaced correctly.
6.21 INPUT PCB & STATUS PCB (fig. 29)
Carry out component removal procedure as
described in section 6.4.
Refer to section 4.10 for details on how to remove
casing.
Remove the 5 screws securing the control board
cover. Carefully note the positions of all
connections relative to the PCB that is to be
removed. Remove the wiring and plugs from the
PCB. Locate and remove the securing screws.
Remove PCB.
Replace in the reverse order, ensuring correct
configuration of wiring.
Fig. 27
1 Hydraulic manifold
2 Safety valve locking screw
3 Pressure gauge locking screw
4 Safety valve
5 Expansion pipe
6 Bleed/drain nipple
7 Automatic bypass
8 Expansion pipe locking screw
1
2
3
4
6
7
8
5
Fig. 28
screws
rear
frame
Fig. 29
input PCB
status PCB