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23
UNICA BHE
6.20.2 DHW FLOW SWITCH (fig. 35A)
Carry out component removal procedure as de-
scribed in 6.4.
Remove the locking pin
(C)
. Disconnect and re-
move the cold water inlet pipe from the DHW flow
switch & DHW heat exchanger. Disconnect the
6.20.5 DIVERTOR VALVE ASSEMBLY (fig. 35C)
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.
6.20.1 DHW FLOW RESTRICTOR (fig. 35A)
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.
6.20.3 VALVE ACTUATOR (fig. 35B)
Carry out component removal procedure as de-
scribed 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.
6.20.4 DHW THERMISTOR (fig. 35B)
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.
fig. 35B
Fig. 35C
fig. 35
B
A
fig. 35A
wiring to the DHW flow switch. Slacken 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.
6.20
FLUE COLLECTOR REMOVAL (fig. 35)
Carry out component removal procedure as de-
scribed in 6.4. Unclip and remove the air cham-
ber front and left side covers. Locate and remove
the screw
(A)
that secures the flue gas analysis
test point cover
(B)
. Remove the clip and the
fumes thermostat. Gently pull down and to the
left and ease the flue collector from its location.
Replace in the reverse order.