23
6.21 FLUE COLLECTOR REMOVAL (fig. 41)
Carry out component removal procedure as described in 6.4.
Remove the air chamber front cover. Remove the heat exchang-
er as per 6.16. 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.
Fig. 41
Y1
Z1
A2
A3
A4
6.22 DHW FLOW SWITCH (fig. 42)
Carry out component removal procedure as described in 6.4.
Remove the locking pin (
D2
). Disconnect and remove the cold
water inlet pipe from the DHW flow switch & DHW heat ex-
changer. Disconnect the wiring to the DHW flow switch. Slacken
and unscrew the inlet connection. Unscrew the nut (
E2
). Lift the
DHW flow switch housing from its seating. If necessary remove
the locking pin (
F2
) 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.
6.23 DHW FLOW RESTRICTOR (fig. 42)
Carry out the component removal procedure as described
in 6.4. 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.
Fig. 42
B2
C2
D2
E2
F2
6.24 VALVE ACTUATOR (fig. 43)
Carry out component removal procedure as described in 6.4.
Remove the locking pin (
G2
) that secures the valve actuator
(
H2
) to the heating manifold. Disconnect the electrical plug from
the actuator. Replace in the reverse order.
6.25 DIVERTOR VALVE ASSEMBLY (fig. 43)
Carry out component removal procedure as described in 6.4.
Remove the valve actuator as described in 6.20.3. Locate and
remove the locking pin (
G2
) that secures the valve housing
cover to the hydraulic manifold. Gently prise the valve assembly
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.
G2
H2
K2
Fig. 43
6.26 DHW HEAT EXCHANGER (fig. 30)
Carry out component removal procedure as described in 6.4.
Before removing the DHW heat exchanger, it may be necessary
to first remove the pump assembly and condense trap.
Locate and remove the screws (
Y3
) 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.
