Worcester GREENSTAR 25CDi GC Instruction Manual page 51

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REPLACEMENT OF PARTS
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26. Hydraulic Block
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.. Ensure the appliance has been fully
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drained.
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.. Disconnect the electrical connections
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26.2
26.2
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26.1
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27.
27.1
27.2
to the NTC, Turbine and pump.
.. Undo the nuts securing the copper
water pipes to the manifold (there is no
need to remove the gas pipe).
.. Release the spring clips securing
these water pipes to the plastic housing
and remove the pipes.
.. Release the spring clip securing the
expansion vessel pipe to the plastic
housing and remove the pipe.
.. Undo the nut securing the pressure
gauge to its bracket and remove the
gauge .
.. Release the locking devices that
secure the two copper water pipes lead­
ing to the combustion chamber by
squeezing the two tabs together and
rotating anticlockwise (viewed from
above).
.. Undo the two screws securing the
hydraulic block to the chassis (located
top left/top right of the housing).
.. Lift the left hand side of the block
slightly, then manoeuvre the block out,
starting with the right hand side.
.. Take care not to snag the harness or
pressure gauge bracket.
NOTE: the block will still contain a small
amount of water, which will spill if the
block is tilted.
.. To refit, follow the above in reverse.
Ensure any seals that have been dis ­
turbed are renewed .
CH pressure relief valve
.. Remove the Hydraulic block from the
boiler (See Removing the Hydraulic
Block).
.. Remove the spring clip from the
Pressure relief valve housing.
.. Withdraw the pressure release valve
(A) from its housing.
.. To refit, follow the above in reverse.
Ensure any seals that have been dis·
turbed are renewed.
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27.1
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~RCESTER
INSTALLATION
&
SERVICING INSTRucrlONS FOR WORCESTER BOSCH GREENSTAR 25CDil30COil37CDil42CDi
REPLACEMENT OF PARTS
6720613700.(2006/11)