Colour Code
Bk Black
Bl Blue
Br Brown
G Green
Gy Grey
V Violet
Pk Pink
R Red
W White
W/Bk White/Black
G/Y Green/Yellow
Or Orange
Component Key
A2 PCB
A4 Display board
B1 Flow sensor
B2 DHW sensor (optional)
B4 External sensor (optional)
B5 Return sensor
B10 Flue sensor
B25 CH flow measuring device (50 model only)
E1 Ignition electrode
E2 Flame sensing electrode
E4 Overheat thermostat
E5 Overheat thermostat (manual reset)
E13 Flue safety thermofuse
G2 Ignition unit
M1 Boiler pump
M30 3-way valve motor (optional)
M20 Fan
S1 Main switch
S5 System pressure switch (70, 90, 115 models only)
S20 Room thermostat (optional)
X40 Room thermostat jumper
Y1 Gas valve
B1
Gy
Y
G/Y
G/Y
W W
W
W
WW
Pk Pk
Pk
G
G G
G
V
Bl
Bl
Bl
Bl
Bl
Bl
Bl
Bl
Bl
W/Bk
Bl
3
A
1B
Or
Or
Or
Br
Or
Or
Or
Br
Br Br
Br
Br
Br
Br
Br
R
R
R
RR
R R
Bk
Bk
Bk
Bk
Bk
Bk
Bk
Bk
CH
DHW
L
L
L
LL
N
N
N
N
L
N
N
L
R
Gy
Gy
Gy
Gy
W
E4
E5
E13
B10
Y1
G2
M1
L
L
N
-VB
PWM
GND
HS
+VB
N
M20
S1
BUS
E2
A2
X40
S20
B4 B2
M30
E1
B5
External
Pump
220Vac
50Hz
Mains Supply
220Vac 50Hz
X02
X00
X04
X01
X13X12
X11
X03 X06
X15
X00X01X05X02
X11 X14
X14
F00
F01
Low Voltage
Low Voltage
220 Vac 50 Hz
A4
A
F
GE
D
B
C
X05 X03 X01X04 X06
Interface
Plug
OT2OT1
6
S1
E F
J
G H R
S2
1 2
3
4
5
Y Z M O
B A
37
External Reset
38
R1 R2 A1 A2
N
L
D C P
Q
IK IS IT
4
2
3
1
4
2
3
1
6
3
4
1
6
3
4
1
6
3
4
1
6
3
4
1
8
4
5
1
10
5
6
1
10
5
6
1
10
5
6
1
X13
14
7
8
1
OT
Analog
Input
0 - 10V
External
Relay
(optional)
Alarm
Free contact
Max 1 A 220 V ac
Coil 220 V ac
Max 0.1 A
220 V ac
Fuse 3.15 AF
M
t
t
t
2
1
Terminal
Blocks
--
++
WARNING: ISOLATE ELECTRICAL SUPPLY BEFORE REMOVING ANY COVERS
Remove link X40 when using
cascade or open therm controls
or external switching (S20)
X13
14
7
8
1
G
G
S5
p
Pro Tec 70, 90, 115 models only
Or
R
Bk
B25
X13
14
7
8
1
Pro Tec 50 model only
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