46
9.9
Electrical circuit diagram Bottom burner (PCB B, right)
CN15
30
29
28
25
26
27
2
3
4
5
6
7
8
16
15
14
13
12
11
10
1
9
17
18
18
17
9
1
[o
p
e
n
]
3
-w
a
y
,
L
'
(N
C
)
Pu
m
p
2
/
3
-w
a
y
,
N
'
Pu
m
p
2
/
3
-w
a
y
,
L
' (
N
O
)
Pu
m
p
1
,
N
'
Pu
m
p
1
,
L
'
G
a
s
Va
lv
e
,
L
'
G
a
s
Va
lv
e
,
N
'
Pu
m
p
3
,
L
'
Pu
m
p
3
,
N
'
Fl
a
m
e
o
n
N
O
L
o
c
k
-O
u
t
N
O
Fl
a
m
e
o
n
N
O
L
o
c
k
-O
u
t
N
O
M
AI
N
S
N
'
M
AI
N
S
L
'
14
13
12
11
10
9
8
7
6
5
4
3
2
1
12
11
10
9
8
7
6
5
4
3
2
1
10
11
12
13
14
15
16
8
7
6
5
4
3
2
CN11
CN10
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
8
9
10
11
12
13
14
CN12
CN3
CN1
CN5
flow sensor ntc (S1) 10K
return sensor ntc (S2) 10K
clixon/maximum (S7)
water thermostat 24vdc
Non Return Valve NRV
end contact
-
+24Vdc
fan Hall
fan PWM
fan control
Ex
te
rn
a
l
ig
n
it
io
n
t
ra
n
s
fo
rm
e
r,
L
Ex
te
rn
a
l
ig
n
it
io
n
t
ra
n
s
fo
rm
e
r,
N
H
e
a
t
d
e
m
a
n
d
N
O
CN6
display
CN7
T2
ignition
transformer incl.
ionisation input.
CN8
separate ionisation
input. (always active)
ionisation and/or
ignition
H
e
a
t
d
e
m
a
n
d
N
O
gas valve(s)
[c
lo
s
e
]
CN10
boiler casing
N
.C
.
F1
F2
fus
e 1
fus
e 2
R
o
o
m
t
h
e
rm
o
s
ta
t
(L
')
R
o
o
m
t
h
e
rm
o
s
ta
t
(i
n
)
internal
connections
internal
connections
FAN
FAN
24Vdc
K2
K6
K5
K5
K3
K3
K8
K7
K7
K4
K8
K3
K6
K2
K2
K6
K9
K5
1
2
4
3
5
6
7
6
5
3
4
2
1
7
6
5
3
4
2
1
8
9
10
CN not used
CN4
K1
K1
K7
K6
K0
K8
K
1
0
K10
K
1
0
bottom
230Vac mains
(internal)
cascade
connection
WIRING COLORS
K0=white
K6=blue
K1=yellow
K7=red
K2=brown
K8=black
K3=green
K9=purple
K4=grey
K10=yellow/green
K5=orange
not used
N.O.
N.O.
N.O.
LOCK-OUT
HEAT
DEMAND
BURNER
BURNING
shielding
Rear wall thermal fuse
N
.C
.
Burner door thermal switch
N
.C
.
K7
K7
K7
Mains 230 V 1
/ 400 V 3
L1 L2 L3 N
Pump connection 1
/ 3
(opt.)
L1 L2 L3 N
Pump relay
(internal)
pump relay
230Vac mains
(supply)
K8
K4
K2
K2
K6
K10
K6
H
e
a
t
d
e
m
a
n
d
N
.O
.
Fl
a
m
e
o
n
N
.O
.
L
o
c
k
-o
u
t
N
.O
.
connection
examples
connection
examples
