42
221680G
14 Replacement of Parts
Diagram 14.25
7683
b
g
CONTROL BOARD
MAINS
SWITCH
THERMISTOR
(CENTRAL HEATING)
PIEZO
FAN
RESISTOR
WATER
PRESSURE SWITCH
AIR
PRESSURE
SWITCH
GAS
CONTROL
VALVE
ELECTRODE
BOILER OVERHEAT
CUT-OFF
FAN
THERMISTOR
(DOMESTIC
HOT WATER)
230V-50Hz
PERMANENT
MAINS SUPPLY
FUSED AT 3A
CHASSIS
EARTH
G/Y
FUSED
AT 3.15A
FUSED
AT 2A
ROOM STAT
CLOCK TIMER
C
N/C
N/O
C1
N/O4
N/C2
PUMP
WATER
FLOW
E
N
L
br
br
w
r
r
r
y
bk
w
bk
g
g
g
br
br
br
X4
X2
X3
X5b
X5a
X6
X1
p
or
or
r
br
b
p
p
r
r
or
or
or
br
b
g/y
p
g
v
b
r
r
y
br
230V TRANSFORMER
PLUG
PLUG
PLUG
PLUG
CHASSIS
EARTH
G/Y
g/y
g/y
NOTE 2
1
NOTE 1
2
C
N/C
N/O
NOTE
1 Red link to be removed when external roomstat is used.
2 Plug C/W link to be removed when clock timer is used. (The removed plug to be left inside the clock timer cover.)
w-
WHITE
b-
BLUE
bk-
BLACK
br
-
BROWN
g/y-
GREEN/
g-
GREY
or-
ORANGE
r-
RED
y-
YELLOW
p-
PURPLE
v-
VIOLET
YELLOW
KEY
