36
G2
H2
K2
B2
C2
D2
Y1
Z1
A2
A3
A4
Fig. 42
Fig. 43
Fig. 44
7.21 FLUE COLLECTOR REMOVAL
(FIG. 42)
Carry out component removal procedure as described in 7.4.
Remove the air chamber front cover. Remove the heat exchang-
er as per 7.17. Locate and remove the screw (
Y1
) that secures
the flue gas analysis test point cover (
Z1
). Disconnect the flues
thermistor wiring connections. Locate and remove the 4 screws
(
A2
). Locate and remove the 2 screws (
A3
). Gently ease the
condensate collector (
A4
) out off its location. Gently ease the
flue collector out off its location. Replace in the reverse order.
7.21.1 DHW FLOW RESTRICTOR
(FIG. 43)
Carry out the component removal procedure as described in 7.4.
Disconnect the cold water inlet pipe at the DHW flow switch
(
B2
). Using a small screwdriver, gently ease the flow restrictor
(
C2
) from its seating. Replace in the reverse order. Ensure
all seals are in good condition, taking care to ensure they are
replaced correctly.
7.21.2 DHW FLOW SWITCH
(FIG. 43)
Carry out component removal procedure as described in 7.4.
Remove the locking pin (
D2
). 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. Lift the DHW flow
switch housing from its seating.
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.
7.21.3 VALVE ACTUATOR
(FIG. 44)
Carry out component removal procedure as described in 7.4.
Disconnect the electrical plug from the actuator (
H2
). Replace
in the reverse order.
7.21.4 DHW THERMISTOR
(FIG. 33)
Carry out component removal procedure as described in 7.4.
Locate and remove the thermistor locking pin (
I2
). Gently ease
the thermistor assembly (
J2
) from the hydraulic manifold. Re-
place in the reverse order.
7.21.5 DIVERTER VALVE ASSEMBLY
(FIG. 44)
Carry out component removal procedure as described in 7.4.
Remove the valve actuator as described in 7.21.3. Locate and
remove the locking pin (
G2
) that secures the valve housing
cover to the hydraulic manifold. Gently prise the valve as-
sembly from the manifold (
K2
). 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.
7.22 REPLACING INTERFACE
Carry out component removal procedure as described in 7.4.
Remove the appliance PCB as detailed in 7.12. Locate and
remove the securing screws that hold the interface to the
control panel, and gently lift the interface away from the
panel. Disconnect the 4-wire plug from the interface, noting
it’s position.
Replace in the reverse order, ensuring that the interface
is correctly located and engaged with the corresponding
interface buttons (also refer to 7.23).
7.23 REPLACING PCB OR INTERFACE
When either the PCB or interface has been replaced, it may be
necessary to re-programme the parameters of the appliance
to suit the personalised settings, e.g. enable clock, appliance,
type, etc. Check that the following parameters are matched to
suit the needs of the specific installation/application.
P3.01
P3.02
P3.03
P3.06
P3.07
P3.08
P3.09
P3.10