Disconnect the union
nut at water
inlet to throttle
housing
and at
water
service
cock. Remove
tube
and
withdraw filter.
Examine
"O"
ring seal,
renew
if necessary.
Clean the filter or
renew
if necessary.
Replace in reverse order.
6.15
Diaphragm and Plate Assembly
Renrove the
controls tray by
pulling
forwards
and
disengaging,
see diagram
14.
Turn the
water
service cock
off
and
drain the
heater,
see
diagram 20. Examine seal on
drain
plug
and renew
if
necessary.
Remove the M5
screw
to
release the clamping
plate
from high
and low
pressure
tubes,
see
diagram
21.
Remove the eight
lr{5
screws securing the bottom
cover o[ diaphragm
housing.
Separate the
halves
of
diaphragm housing.
Note.
When replacing
diaphragm
ensure
that
the
high
pressure
side
is facing
downward.
fl
6.16
SpindFfg.l.
-
Diaphragm Housing
Remove ,r,"
.ffi ray
by
pulling
forwards and
disengaging,
see diagram i4.
Tum the
water
service cock
off
and drain the
heater,
see
diagram 20. Examine
seal on
drain
plr:e,
renew
if necessary.
Remove the lv15
screw to release
'clamping
plate
from
high and
low
pressure
tubes, see
diagram
21.
Examine
"O"
ring
sea-ls and
renew if
necessary.
Remove the
two
M5
screws
securing
the
diaphragm
housing to lhe
automatic
valve.
Carefully
withdraw
the
diaphragm
assembly downwards leaving
spindle
in automatic
valve
section.
Remove
brass
washer
to
expose
seal.
Carefully
prise
uut the
spindle seal and
replace with new
seal.
Lubricate
with
silicone
grease,
Dow
Corning
1ll
or
equal.
Replace
in
reverse
order, taking
care no
to bend
the
spindle.
6.17
Automatic
Valve
Complete the steps in
the
first
five
paragraphs
of
Section
6.16 to
remove
the spindle
and
seals.
Remove
the
burner
as
in Section 6.2.
Remove the
M5 screws at automadc
valve
sas
feed
pipe
flange
connection,
Remove
the four
M5 screws securing the
uansfer
elbow
to
automatic valve.
Remove
lhe
automatic Valve. Examine
gaskes
and
"O"
ring
seal, renew as necessary.
Replace in reverse
order.
sf
_ BRASS
WASHER
(a-\)l'
ffi-,.--
SPAcER
H" -----
vALVE
SPINDLE
l)-{
N
''
-/
BRASS WASHER
X'/.
\? .
JEAL
C')
q
M5 SCREW
(4)
TRANSFER
ELBOW
AUTOMATIC
VALVE
StAL
PR
ESSURE
th5 I
POINT
SCREW
/
M5
SCREW
(2)
M5
SCREW
(8)
DIAPH
RAGM
AND
PLATE
ASSEM
BLY
HIGH
PRESSURE
TUBE
R
ING
i
@
Diagram
21
GASKETS
1q
LOW PRESSURE
TUBE
206J
|
6
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