VOKERA Unica i28 User Instructions - page 26
24
P2
Fig. 46
Fig. 44
Fig. 43
E2
F2
G2
H2
I2
N2
O2
M2
L2
Fig. 45
A2
B2
C2
D2
L2
M2
6.20 FLUE COLLECTOR REMOVAL (fig. 43)
Carry out component removal procedure as described in 6.16.
Locate and remove the screw (
A2
) that secures the flue gas
analysis test point cover (
B2
). Remove the clip and the fumes
thermostat (
C2
). Locate and remove the screws (
D2
) that se-
cure the flue collector to the combustion chamber Gently pull
forward and ease the flue collector from its location. Replace
in the reverse order.
6.20.1 DHW FLOW RESTRICTOR (fig. 44)
Carry out the component removal procedure as described in
6.4.
Disconnect the cold water inlet pipe at the DHW flow switch
(
E2)
. Using a small screwdriver, gently ease the flow restrictor
(F2)
from its seating. Replace in the reverse order. Ensure all
seals are in good condition, taking care to ensure they are
replaced correctly.
6.20.2 DHW FLOW METER (fig. 44)
Carry out component removal procedure as described in 6.4.
Remove the locking pin
(G2)
. Disconnect and remove the
cold water inlet pipe from the DHW flow switch & DHW heat
exchanger. Disconnect the wiring to the DHW flow switch.
Slacken and unscrew the inlet connection
(E2)
. Unscrew the
nut
(H2)
. Lift the DHW flow switch housing from its seating. If
necessary remove the locking pin
(I2)
from the DHW flow switch.
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.
6.20.3 VALVE ACTUATOR (fig. 45)
Carry out component removal procedure as described in 6.4.
Remove the locking pin
(L2)
that secures the actuator
(M2)
to
the heating manifold. Disconnect the electrical plug from the
actuator. Replace in the reverse order.
6.20.4 DHW THERMISTOR (fig. 45)
Carry out component removal procedure as described in 6.4.
Locate and remove the thermistor locking pin
(N2)
. Gently
ease the thermistor assembly
(O2)
from the hydraulic manifold.
Replace in the reverse order.
6.20.5 DIVERTOR VALVE ASSEMBLY (fig. 46)
C
arry out component removal procedure as described in 6.4.
Remove the valve actuator as described in 6.20. Locate and
remove the locking pin (
P2
) that secures the valve housing
cover to the hydraulic manifold. Gently prise the valve assem-
bly from the manifold. Replace in the reverse order ensuring
that the seating assembly is inserted properly. Ensure all seals
are in good condition, taking care to ensure they are replaced
correctly.