Specifications

o
8.30
Change
of
micro-switches
of water
section
Open
control
box
as in 8.28
and
remove switch
box as
in 8.23.
Remove
the adjustment
screw
(C5)
and
take off
the
microswitch assembly.
Pulloff
AMP
plugs
(C4).
Reassemble
in reverse order.
Check
-
earth continuity
-
PolaritY
-
resistance
lo earth
according
to INSTRUCTIONS
FOR
BRITISH
GAS
MULTIMETER.
8.31 Change
of
overheat
cut-off device
Open
the control
box as
in 8.28 and
remove
the
switch
box
as
in 8.23.
Pull off
the
2
plugs
(CG)
and the earth
lead,
remove
the
saddle
clip
(C7),
pull
the sensor
(3,
fig. 52)
out of
the
main heat exchanger.
Unsciew
the 2 retaining
screws
(C8),
release
grommet from box
and
remove cut-off
device.
Reassemble
in reverse order.
Check
-
earth
continuity
-
Polarity
-
resistance
to earth
according
to
INSTRUCTIONS
FOR BRITISH
GAS
MULTIMETER.
Check
connections
for
gas
soundness.
8.32
Change
of electronic
P'c.b'
Open
the
control
box as
outlined
under 8.28.
L
Uirscrew
the retaining
screw
(C9)
on
the
left
rt
hand side of
the control
box.
P.c.b.
is held on
key-hole
slot,
pull p.c.b.
forward
and
to the
right.
Pull
off
multiplug and
white
lead.
Reassemble
in reverse
order
and ensure
the
p.c.b.
is located
on
the left
hand side of
plastic
peg.
Check
-
earth
continuity
-
polarity
-
resistance
to earth
according
to
INSTRUCTIONS
FOR
BRITISH
GAS
MULTIMETER.
)