Worcester 26CDi Xtra Installation And Servicing Instructions Download Page 30

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18. Water Diverting Valve Micro Switch Assembly.

See figs. 37 and 40.

Check that the electricity supply to the appliance is turned off.
Hinge down the facia panel into the Servicing Position as
described in Section 13.3 (c).
To access the micro switch remove the bottom panel as
described in Section 13.3 (d).
Using a pair of fine nosed pliers, pull the circlip off and remove
the micro switch assembly from the valve. Pull off the black
plastic cover and carefully ease the connections off the
terminals.
Withdraw the switch assembly from the appliance and discard.
Fit the replacement micro switch assembly in the reverse order.
Polarity is not important.
Reassemble the appliance in the reverse order.

19. Water Diverting Valve.

See figs.18, 37, 39 and 40.

Check that the electricity supply to the appliance is turned off.
Drain the central heating and domestic hot water circuits as
described in Sections 14.2 (a) and (b).
Hinge down the facia panel into the Servicing Position as
described in Section 13.3 (c).
Remove the bottom panel, filling loop, water to water heat
exchanger and micro switch assembly as described in Section
13.3 (d), and Sections 14.3 (16), (17) and (18).
Pull off the support plate locating the water diverting valve to the
central heating plastic flow manifold on the left hand side of the
appliance.
Remove the wire clip securing the copper by-pass pipe to the
flow manifold.
Retain the support and plate and wire clip.
Carefully ease the by-pass pipe out of the manifold and allow the
pipe to swing forwards to clear the manifold connection.
Remove the screw securing the bracket, located at the right hand
end of the water diverting valve, to the appliance casing.
Remove the four screws located at the left hand side securing
plastic manifold to the appliance.
Remove the water diverting valve and plastic manifold assembly
clear of the appliance.

Ease the water diverting valve out of the plastic manifold.
Remove the securing bracket from the valve and the water filter
from the valve cold water inlet.
Retain the plastic manifold, fixing screws, support bracket and
water filter.
Discard the water diverting valve.
Reassemble the original support bracket, water filter and new
‘O’ ring seals to the replacement valve.
Lubricate the ‘O’ ring seal and push the plastic flow manifold
onto the valve.
Reassemble the water diverting valve and plastic manifold
assembly to the appliance in the reverse order.
Ensure all ‘O’ ring seals and fibre washers are renewed and
replaced correctly and the ‘O’ rings are lubricated.
Reassemble the appliance in the reverse order.
Open the valves and fill and re-pressurise the system as
described in Section 11.1.

20. Inlet Water Filter.

See figs. 18,37,39 and 40.

Check that the electric supply to the appliance is turned off.
Drain the central heating and domestic circuits as described in
Sections 14.2 (a) and (b).
Hinge down the facia panel into the servicing position as
described in Section 13.3 (c).
Follow the proceedures as described in Section 14.3 (19) and
remove the water divering valve from the appliance.
Remove the water filter from the cold water inlet.
Discard or clean the filter.
Fit the replacement filter (push fit) in the reverse order.
Reassemble the appliance in the reverse order following the
proceedure described in Section 14.3 (19).
Open the valves and fill and re-pressurise the system as
described in Section 11.1.

21. Domestic Hot Water Flow Regulator.

See fig. 39.

Check that the electricity supply to the appliance is turned off.
Drain the central heating and domestic hot water circuits as
described in Sections 14.2 (a) and (b).
Hinge down the facia panel into the Servicing Position as
described in Section 13.3 (c).
Remove the water to water heat exchanger assembly as
described in Section 14.3 (17).
The hot water plastic flow restrictor is housed in the cold water
inlet to the heat exchanger and is a push fit. Remove the flow
regulator and discard.
Fit the replacement flow regulator with the direction of flow
indicated on fig. 39.
Reassemble in the reverse order ensure all the fibre washers and
‘O’ rings are in place.
Reassemble the appliance in the reverse order.
Open the valves and fill and re-pressurise the system as
described in Section 11.1.

22. Expansion Vessel.

See figs. 32, 37, 38 and 39.

Check that the electricity supply to the appliance is turned off.
Drain the central heating and domestic hot water circuits as
described in Sections 14.2 (a) and (b).
Hinge down the facia panel into the Servicing Position as
described in Section 13.3 (c).
Remove the air pressure switch, gas to water heat exchanger,
circulating pump, filling loop and water to water heat exchanger
as described in Section 14.3 (2), (5), (14), (16) and (17).
Unscrew the union connection on top of the water diverting
valve and remove the flow pipe.
Pull out the wire clip from each end of the copper by-pass pipe
and remove the pipe.
Reach under the inner casing and remove the securing clip from
the right hand pipe connection.
Ease the pipe out of the connection.
From inside the inner casing release the rear pipe from the push-
fit location. Release the sealing grommet from the base of the
inner casing.