24
6.17
FLOW RESTRICTOR (fig. 35)
Carry out the component removal procedure as
described in 6.4.
Disconnect the cold water inlet pipe at the DHW
flow switch
(A)
. Using a small screwdriver, gently
ease the flow restrictor
(B)
from its seating. Re-
place in the reverse order. Ensure all seals are in
good condition, taking care to ensure they are
replaced correctly.
6.18
DHW FLOW SWITCH (fig. 35)
Carry out component removal procedure as de-
scribed in 6.4.
Remove the locking pin
(C)
. Disconnect and
remove the cold water inlet pipe from the DHW
flow switch & DHW heat exchanger. Disconnect
the wiring to the DHW flow switch. Lacken and
unscrew the inlet connection
(B, fig. 14)
. Unscrew
the nut
(D)
. Lift the DHW flow switch housing from
its seating. If necessary remove the locking pin
(E)
from the DHW flow switch, taking care not to
lose the float contained within the housing.
Replace in the reverse order ensuring that the
housing is firmly inserted onto its seating. Ensure
all seals are in good condition, taking care to
ensure they are replaced correctly.
6.19
DHW HEAT EXCHANGER (fig. 36)
Carry out component removal procedure as
described in 6.4. Locate and remove the screws
(E)
that secure the heat exchanger to the DHW
manifolds. Carefully remove the heat exchanger
from its location taking care not to spill any residual
water. Replace in the reverse order ensuring that
the heat exchanger ‘O’ ring seals are correctly
inserted into the DHW manifolds. Ensure all seals
are in good condition, taking care to ensure they
are replaced correctly.
6.20
VALVE ACTUATOR (fig. 36)
Carry out component removal procedure as
described in 6.4.
Remove the locking pin
(F)
that secures the
actuator
(G)
to the heating manifold. Disconnect
the electrical plug from the actuator. Replace in
the reverse order.
6.21
DIVERTOR VALVE ASSEMBLY (fig. 36)
Carry out component removal procedure as de-
scribed in 6.4. Remove the valve actuator as de-
scribed in 6.20. Locate and remove the locking
pin
(A)
that secures the valve housing cover to
the hydraulic manifold. Gently prise the valve as-
sembly from the manifold. Replace in the reverse
order ensuring that the seating assembly is in-
serted properly. Ensure all seals are in good con-
dition, taking care to ensure they are replaced
correctly.
6.22
DHW THERMISTOR (fig. 36)
Carry out component removal procedure as de-
scribed in 6.4.
Locate and remove the thermistor locking pin
(H)
.
Gently ease the thermistor assembly
(I)
from the
hydraulic manifold. Replace in the reverse order.
6.23
AUTOMATIC BY-PASS & DHW NON-RETURN
VALVE (fig. 37)
Carry out component removal procedure as de-
scribed in 6.4.
Remove the locking pin
(A)
that secures the cover
(B)
to the hydraulic manifold. Using a hooked piece
of wire, carefully withdraw the by-pass cartridge
(C)
and/or DHW non-return cartridge
(D)
. Ensure all seals
are in good condition, taking care to ensure they are
replaced correctly. Replace in the reverse order ensur-
ing the cartridge is facing the correct way.
6.24
EXPANSION VESSEL (fig. 1)
Should the removal and replacement of the expan-
sion vessel be deemed impractical, an external
expansion vessel may be fitted to the return pipe
as close to the appliance as possible.
Fig. 34
A
B
Fig. 35
Fig. 36
A
Fig. 37
A
B
C
D
E
A
D
C
B
