45
EMPTY
CN15
L1 N L2
Divertor Valve Calorifier
by Calorifier Pump P2
40
39
38
37
A B
CASCADE
CONNECTION
18
17
OUTDOOR
SENSOR
EXTERNAL
WPS
12
11
10
9
8
7
CALORIFIER
SENSOR
or
THERMOSTAT
EXTERNAL
FLOW
SENSOR
N.O.
N.O.
N.O.
LOCK-OUT
HEAT
DEMAND
24
23
22
GENERAL
BLOCKING
1
2
3
4
5
6
13
14
15
16
19
20
21
41
42
43
On/Off Stat
or
OpenTherm
Heating
Circuit
+ -
0 - 10
VDC
BURNER
BURNING
L N
2
3
4
5
6
7
8
16
15
14
13
12
11
10
1
9
17
18
18
17
9
1
Gnd
out
Gnd
out
[o
p
e
n
]
3-w
a
y
, L
'
(N
C
)
P
u
m
p
2
/
3
-w
a
y
, N
'
P
u
m
p
2
/ 3
-w
a
y
,
L
'
(N
O)
P
u
m
p
1
, N
'
P
u
m
p
1, L
'
G
a
s
Val
v
e
, L'
G
a
s
Valv
e
, N
'
P
u
m
p
3, L
'
P
u
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
AINS 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
flue sensor ntc (S6) 10K
clixon/maximum (S7)
water thermostat 24vdc
Non Return Valve NRV
end contact
siphon pressure switch (PSW)
-
+24Vdc
fan Hall
fan PWM
fan control
+5V
water pressure sensor
(when no water pressure
switch is connected)
E
x
te
rn
a
l i
g
n
it
io
n
t
ra
n
s
fo
rm
e
r, L
E
x
te
rn
a
l i
g
n
it
io
n
t
ra
n
s
fo
rm
e
r, N
He
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)
ionistion and/or ignition
He
a
t
d
e
m
a
n
d
N
O
gas valve(s)
N
[c
lo
s
e
]
CN10
boiler casing
N.C.
N.
C
.
ref.1
F1
F2
fu
s
e
1
fu
s
e
2
Ro
o
m
th
e
rm
o
s
ta
t
(L
')
Ro
o
m
th
e
rm
o
s
ta
t (
in
)
internal
connections
internal
connections
FAN
FAN
24Vdc
K2
K6
K5
K5
K3
K3
K0
K0
K8
K8
K6
K6
K8
K7
K7
K4
K8
K3
K6
K8
K2
K6
K2
K2
K6
K9
K9
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
K4
K4
K2
K2
K2
K2
ref.1
K1
K1
K7
K8
K7
K7
K3
K5
K7
K6
K0
K8
K8
K6
K3
K6
Rear wall thermal fuse
K7
K7
K
10
K
10
K
10
K10
K
10
TOP
230Vac mains
(internal)
cascade
connection
34
35
36
L N
CH system
Pump P3
K6
K2
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
not used
N.
C
.
Burner door thermal switch
N.
C
.
K7
INTERNAL
MAIN POWER
CONNECTOR
pump relay
K2
K6
Re
m
o
te
tem
p
e
ra
tur
e
s
e
tpo
in
t
o
r b
u
rn
e
r i
n
p
u
t
s
ig
n
a
l
fo
rm
BM
S
wa
te
r p
re
s
s
u
re
s
w
it
c
h
C
a
lo
ri
fi
e
r
th
e
m
o
s
ta
t
C
a
lo
ri
fi
e
r
s
e
n
s
o
r
1
0
K
E
x
te
rn
a
l
fl
o
w
s
e
n
s
o
r
1
0
K
O
u
td
o
o
r
s
e
n
s
o
r
1
2
K
O
p
e
n
T
h
e
rm
/
p
o
w
e
r s
tea
lin
g
th
e
rm
o
s
tat
wire
bridge
External safety device:
- External flow switch
- Smoke detection
- Gas detection
- Ventilation fan
- Flue gas fan
- End switch motor actuated
flue gas valve
- Gas leakage tester
- etc
only when unit is
cascaded
to
slave
boiler
to
master
boiler
POWER
SUPPLY
He
a
t d
e
m
a
n
d
N.O.
Fl
a
m
e
on
N.O.
L
o
c
k
-o
u
t
N.O.
connection
examples
connection
examples