Worcester Greenstar 12i System Instruction Manual page 52
Wall hung rsf gas fired condensing boiler
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Also See for Greenstar 12i System:
- Instruction manual (76 pages) ,
- User manual (20 pages) ,
- Installation, commissioning and servicing instructions (72 pages)
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REPLACEMENT
OF
PARTS
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28.2
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28.3
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REPLACEMENT
OF PARTS
27.
Bypass valve
•
Remove
the
Ht<fravlic
block from
the
boiler
(See
Removing
the
Hydraulic
Block).
2.7.1
Remove
the
two spring
dips
at either end
of
the
copper
bypass pipe.
•
Undo
the
scr-ew
securing
the
left
hand
plastic
hou-
S
ing to the
hea1
exchanger
•
Move
the
housing
to the
lett
to
free up
one
end
of
the pipe.
•
Remove
the
p1>e from
the right hand
housing
to
reveal
the
bypass valve.
27.2
Using
a pair
of
pl
ie~
pvll out the bypass
valve
(A) from
the.
housir\9.
•
To
refit,
follow
the
abO'te
in
reverse. Ensvre
any seals
that have
been
disturbed are
rene'\vad.
28.
Expansion vessel
The expansion
vessel
can
be
replaced with
the
boik!r in
position
if there
is
tl
side
exit
flue frtted
and there is a
minimum clearance of
340mm
above the
boiler
casing.
If vertical
five
is
fitted
then
a
similar
clearance
to one
side
and
the
flue
is
requi(ed.
If
cle-arance
is
not available,
the
boiler
wil
need
to
be
(emoved
f(om
the
mounting ftame
to gain
access
to
the ax.pansion
vessel
Alternatively a
second
vessel
of
at
least
the
capacity
of
?Its
can
be
fitted to
the
retum
from
the
heating
system as close
as
possible
to
the
boiler.
Expansion vessel replacement
(Boller
In
place)
•
Isolate mains
power trom the
boiler.
•
Place the controls in setvtce position.
•
lsoatlte the
boiter
from
the
heating
system
(and
cylinder
rotum
if inta.-nal
d~rter
valvG
is
fitted)
using
service
valves.
•
Drain
boiler.
28.1
Remove
clip
from
expansion
VGSS$1
connection.
28.2
RemOV9
scr~w
retainh
g the vesse-l
to
the
top
of
the
boiler
ca.
s
ing.
28.3
Pull the vessel up and
out
over
the
ft.Je
system
or
to one
$ide
if
frtted
with
a vertical
flue.
•
Remove
the
flexible hose
f(om
the
()Xpatlsion
vessel
and
fit
to
the
replacement vessel
using
a oow
seal. Ensure
that the coMection
to
the
boiler
will
be
pointing
to
the
right hand
side of the appliance when
fitted.
•
Reassemble
expansion
ve$$el
into
boiler and
connect
flexible
pipe to
boiler.
Removing boiler
•
Isolate electrical supply.
•
lsolat$
system ar\d gas coMectklns at the
service vaJves..
•
Drain
boiler.
•
Oisconooct e&ecttical supply and any
extemal
controls.
~
Disconooct flue connection
from
the
bolle(.
•
Undo
c:onnection
to
boiler
at
the
seMce
vatves.
•
Remove clip
from
expansion
vessel
connection
to
the
boiler.
•
Gently raise
the
boiler
off
the
mounting
frame.
•
Replace expansion
vessel
and refit
the
bolter
to
the
mounting
f~me.
•
Follow
the
commissioning
procedure
in.
this
manual
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