Technical data

26
Linea
6.25 AUTOMATIC BYPASS fig. 38
Carry out component removal procedure as de-
scribed in 6.4.
Disconnect and remove the flow pipe at the heat-
ing manifold & DHW manifold (1), and at the con-
nection to the air chamber. Using a hooked piece
of wire, carefully withdraw the bypass cartridge
(2). Ensure all seals are in good condition, tak-
ing care to ensure they are replaced correctly.
Replace in the reverse order ensuring the car-
tridge is facing the correct way.
Fig. 38
6.26 DHW NON-RETURN VALVE fig. 39
Carry out component removal procedure as de-
scribed in 6.4.
Disconnect and remove the flow pipe at the heat-
ing and DHW manifold (1), and at the connec-
tion to the air chamber. Using a hooked piece of
wire, carefully withdraw the non-return cartridge
(2). Ensure all seals are in good condition, tak-
ing care to ensure they are replaced correctly.
Replace in the reverse order ensuring the car-
tridge is facing the correct way.
Fig. 39
6.27 EXPANSION VESSEL fig. 1
Should the removal and replacement of the ex-
pansion vessel be deemed impractical, an exter-
nal expansion vessel may be fitted to the return
pipe as close to the appliance as possible.
Fig. 40
6.27.1 EXPANSION VESSEL REMOVAL (with suffi-
cient clearance above)
Carry out component removal procedure as de-
scribed in 6.4.
Disconnect the flue from the appliance.
Disconnect the flexible expansion pipe from the
vessel (Fig. 40). Locate and remove the four
screws that secure the vessel top holding plate,
remove the plate. The expansion vessel can now
be removed. Replace in the reverse order. En-
sure all seals are in good condition, taking care
to ensure they are replaced correctly.
6.27.2 EXPANSION VESSEL REMOVAL (with insuf-
ficient clearance above)
Carry out component removal procedure as de-
scribed in 6.4.
Disconnect the flue elbow or pipe from the appli-
ance flue outlet. Unclip and remove the air cham-
ber cover, gently pull the cover towards you be-
fore lifting and disengaging. Remove the RH side
panel of the air chamber. Disconnect the wiring
to the fan, pressure switch, primary thermistor, &
overheat thermostat. Carefully unclip the wires
from the air chamber and withdraw the wiring &
grommet from the air chamber. Disconnect the
electrode lead and burner thermostat wires
Disconnect the outlet gas pipe and the flow & re-
turn pipes from the air chamber.
Locate and remove the 2-screws that secure the
lower section of the air chamber. Locate and re-
move the 2-screws that secure the upper section
of the air chamber. The complete air chamber
assembly can now be lifted clear from the appli-
ance. Disconnect the flexible expansion pipe from
the vessel (fig. 40). Locate and remove the 2-
screws that secure the vessel (1). The expan-
sion vessel can now be removed. Replace in the
reverse order. Take extreme care when refitting
the wiring to the air chamber. Ensure all seals
are in good condition, taking care to ensure they
are replaced correctly.