29
icos - Installation & Servicing
INSTALLATION
Spark generator
nm 8076
bk
b
br
bk
b
bk
r
b
v
b
r
br
b
r
r
b
r
r
r
or
or
or
or
b
pk
pk
y y
y/g
y/g
Ferrite
y/g
y/g
y/g
y/g
y/g
y/g
bk
bk
Flue
thermistor
Overheat
thermostat
Flow
control
thermistor
Gas valve
ON /OFF
Switch
Service
connection
MAINS
SUPPLY
230V 50Hz
Permanent
black link
Fan
y
y
Chassis
earth y/g
Control PCB
Fused at
3.15ATL
bk
bk
yy
User
control
and
display
brb
38FUNCTIONAL FLOW WIRING DIAGRAM
Overheat
thermostat
1
2
br
r
rbk
y
pk
b
Mains Switch
Flame detection
electrode
DC
Fan
I
g
nition electrod
e
CH return thermistor
(not fitted)
Control thermistor
D
C
G
as valv
e
b
v
b
k
or
or

N

L

Control PCB

User PCB

y/g
rr
y
b
y
b
nm 7201
br
y/
g
br
bk

E

b
Fl
th
rmi
t
S
park
g
enerato
r
External switch e.
g
.
room'stat, pro
g
ramme
r
37PICTORIAL WIRING DIAGRAM
LEGEND
b-blue
bk - black
br - brown
gy - grey
or - orange
pk - pink
r-red
v-violet
w-white
y-yellow
y/g- yellow/green
LEGEND
b-blue
bk - black
br - brown
gy - grey
or - orange
pk - pink
r-red
v-violet
w-white
y-yellow
y/g- yellow/green
INSTALLATION