Worcester HEATSLAVE 9.24 RSF Installation And Maintenance Instructions Manual page 40
Wall hung combination boiler for central heating and mains fed domestic hot water
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19.
TO REPLACE THE SPARK
ELECTRODE CABlE
{See Figs. 44
and
4
5.)
(a!
Pull
the c
able o
ff
!he
s paj
e connect
or
on the
spa1k
electrode.
(b I Remove
the sealing
cover on t he bottom
of the boiler casing
held
in position
wit
h one M5
screw. Feed
the spa rk
electrode cable
through
t he hole in t he
boiler
casing.
(c)
Pull
t
hecableoff
t
heelectricalconnecdonon
t
hesequence
control board po
sitioned
at
t
he
top
right-hand comer.
Remove
t
he
cable
t
hreading it
t
hrough
t
he hole
in t
he
rear
of
t he
elect rical panel.
(dl Hinge
t
he electrical
t ray
downwards by
following
t he
general
notes prior to Instruc tion
7
.
(e
)
Rernove the cable
clamp
sec:uring
the
spark elect
rode
cable
frorn
the
rear of
the
electrical
pan~l.
(f
)
Remove the cable t hreading
it
t hrough
the ho!e
in
the
rear
of the
eiectrical
panel.
!gl Remove the
t
wc p
r ot
ectiv
e
sleeves from
th
e
spark
eiect
rode
cable.
lhl
A~ place
the
new
cable
ir.
th.o:!
rev
erse order and
ensure:
i)
The
s
ealing cov
er is
replaced ar.d
seals
the casing.
ii)
The
elect rical
con
nection is made to the t
erminal
on
the
sequen
ce
cont
r
ol boa;d
marked
HT
1md
positioned
at
t he
t op
rigllt-hand
corner.
20
.
TO REPLACE
THE ELECTRONIC
DRIVER
BOARD
!See
Figs.
4
3
and 44.)
(a}
Remove
t
he
tan
pressure
switch as
described in Part
18a,
b
!:!lid
c.
fbl Release
the
ptastic
catc
h
on the end
of
each mounting post
p
ulling
t
he printed
circuit board forward
approximate!y
3
rn
m
to
prev ent
the
piastic
catch
f
rom
returning
.
fc}
Pull
the
board offthe
remainderof
themouming posts unti
l
it is
free.
(d)
Grasp
ing
t
he
board
f
irmly pull
off
t
he electrical
edge
connect
ion,
t he
temperat
ure
cor~trol
connection
and
I
he
two-way
Molex
plug
.
.
tel Remove
the
plastic
pressure adjust
ment spindle from
t
he
rear
of
the driver
and
insert
int
o
t
he replacement
driver
board.
{f
)
l.ocut
e
t
he
elec
trical ed
ge connector
in
place and push on
to
the
printed cirCUit board
. The edge
cor"~nector
has
t
hree
ribs
which
loc
ate
into three matching slots
in
the
board
so
ensuring
correct orientation.
Similarly reconnect the
temperat
ure
control
and the
two-
w
ay Mol
ex
plug
.
(g) Locate the
new
board over the four
mounting
posts and
push
back squarely
until
t
he plast
ic catch
on
the end
of each
post
clicks
into place.
(h)
Rea
ssemble the
fan
pressure switch in the reverse
order
as
de.scribed
in Part
18
d
.
21
.
TO
REPlACE
THE
TRANSFORMER
(Figs
.
44and
45.)
(a)
Follow
t
he
wires
from
the t ransformer
to the
main
terminal
block and
disconnect
the
blue.
brown,
orange
and
black
wires from
terminals
N, 6,
12
and
13
respect
ively.
(hi Remove the two
M4
t
aptit
e
scr
ews securing the
t ransformer inside
tMe
electric11l
cover.
(c) Remove
t
he
t
ransf
ormer and the
paxolin
insulation.
(d)
Refit
a
new
transformer in
t
he
reverse
order.
The holes
in
the
pax
olin iniulation are off
centre
and the insulation
40
shou
ld be
rep
laced
w ith the wide section under t
h
e
t
ransform
er
electrical
connect
ions.
22
.
TO
REPLACE
THE
SUPPRESSOR
(fijg,
44.)
{a)
The
suppressor is
located to
the
left of t
he
t
erminal bloc ks
and
held
by
a
'P'
clip
secured
by
a
screw.
Remove
t
he
screw
and
ease
t
he suppresso
r
clear
of
t
he
bracket
.
{b) Disconnect
t
he
suppressor
leads from
t
ermina!s
N
2
and
4
on
the
terminal strip
and remove.
(c)
Replace w
ith
a new suppressor and reassemble ir. reverse
order.
23.
TO REPLACE THE SEOU
ENCE
CONTROL BOARD
(Figs.
44 and
4
5.)
(a)
Remove the
t
ransformer
as described in Part 2
1 b and
c.
(b
)
Pull
t he
spark
electrode cable
oitt
he
electrical connect
ion,
at t
he
t
op right
hand
corner
oft
he
sequence control
board,
marked
HT.
(c)
Disconnect
the
four Moiex plugs
noting
their pu!iition:;.
ldl
Release the
plastic catch on
t
he
end
of
each mounting
post
pulling
t
he p rinted
ci
rcuit
board
forward
approximat
ely
3 mm to prevent the plastic
eaten from
re
tu
rn
fr~
g.
iel
Pull t he board
off
the
remainder of
th
e
mount ing
p~a
te
untit
it
is f ree.
m
Locate the new
boi!lrd
over t he
f
t>ur
mounting posts
and
push
back squarely
until
the
plastic
catch
on
the
end of
eactl
post
cl
icks
into place.
(gl
Reassemble
in
t
he
reverse
order and ensure:
i)
The
spark
electrode
ca
ble
is
connected
to
t
he t
erminal
ma
rked
HT
at the
top
right
-h
an
d co rner
of
the
sequenc
e control
board.
iil
The Molex plugs
are fitted
to the
correct
term
inals.
Plugs
are
not interchangeable and w ill only
f
it
the
socket they wete removed
f
rom.
2
4
.
TO
REPLACE
THE 3
·
POSITION
SWITCH
(a)
Remove
t
he
push-on
connect
ions from
t
he rear
of
the
switch
t
aking
note
of
th eir
posit ions
.
(b
)
Squeeze t ogether
the
two
plastic
ret
aining
lugs
and remove
the
swit ch
from the
front
of
the
f
acia.
(c)
Snap
in
the replac ement
sw
it
ch
and
with
t
he aid
of t
he
wiring
difigram.
See
Fig.
27.
Co nnect t
h
e
push
-on
connectfons.
25
.
TO REPLACE
T
HE PROGRAMMER ASSEMBLY
lal Remove
the
clamping
bracket
from
each
end of
the
progr(lmmer
by
u
nscrewing t
he fo ur M4 taptite
screws
retaining
them
t
o
t
he
facia.
{bl
Remove t he old
programm er
comp lete
w
it
h its
wiring
harness and f ro nt b
ezel.
(c) Rei it
t
he
new
programmer
in t he reve
rse
order
complete
w ith it
s
new
bezel and
w frin
g ha rness
using
t
he old
clamping brackets
and
screws.
26
.
TO
REPLACE
THE CENTRAL HEATING SENSOR
Check
that
t
he
electricity supply
has been
turned
off.
(a)
Turn
oftthe
CH
flow
and
ret
urn
co
nnec
t
ions
to the
boiler
and
drain t
he
appliance.
lbl
Pull
oH
tne two w ires
from t
he
sensor
and
unscrew
t
he
sensor.
{c) Fit the new
sensor and
reconnect t
he
two
w ires
.
{d)
Open
the
v11lves
and
reffll the
system venting
as
necessary
.
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