~ORCESTER
Bosch
Group
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26.2
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INSTALLATION
&
SERVICING
INSTRUCTIONS
FOR
WORCESTER
BOSCH
GREENSTAR
25CDV30CDV37CDci42CD•
6
720
613
700a
(2006/11)
REPLACEMENT
OF
PARTS
26. Hydraulic Block
26.1
26.2
27.
27.1
27.2
~
Ensure the appliance has been fully
drained.
~
Disconnect
the electrical
connections
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.
REPLACEMENT
OF
PARTS
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