Alpha E-Tec 25R - Wiring Diagram

40
9.1 ILLUSTRATED WIRING DIAGRAM
9 WIRING DIAGRAM
Alpha E-Tec 15, 20, 25R - Wiring Diagram
Colour Code
Bk ......Black
Bl .......Blue
Br ....... Brown
G ........Green
Gy ...... Grey
G/Y ....Green/Yellow
Or.......Orange
R ........ Red
W .......White
Component identification
A28 ..........DHW relay board 230 Vac - (optional)
B1 ............Flow sensor
B4 ............External sensor (optional)
B5 ............Return sensor
B10 ..........Flue sensor
E3 ............Ignition and sensing electrode
E4 ............Overheat thermostat
E14 ..........Flue thermofuse
G3 ............Spark generator
M20..........Fan
R5 ............Trimmer DHW set
R6 ............Trimmer CH set
R14 ..........Boiler configuration resistance (2.7 kohm)
T2 ............Voltage transformer
Y1 ............Gas valve
X16 X4
2
4
4
2
5
1
1
5
3
3
X12
4
2
3
6
5
17
X18
4
2
3
6
5
178
X14
4
2
3
6
5
1
7
8
9
10
11
X7
4
2
3
6
5
1
X17
3
5
4
1
2
6
X19
21
X3
L
N3
4
X10
X9
X11
X15
1
1
2
2
3
3
Fuse
3.15 AF
250 V
T2
DHW SET
+
CH SET
+
B
N
A
L
X5
12
3
4
56
X8
1
X6
R2
Low voltage electrical connections
230 Vac electrical connections
E4B1 B5
B4
Y1
E3
M
G3
When an Alpha Climatic control is
connected to terminals 41 and 44
remove the links between terminal
blocks 1 and 2
Mains Supply
230 V ~ 50 Hz
230 V Room
thermostat
(optional)
External pump
(optional)
230 Vac Max 1A
Programmer clock
(optional)
Remove link 1 to 3
to connect clock
Bk
Bl
Br
Gy
W
(Heating)
CH1 - DHW OFF
(DHW ON)
CH2 - CH ON
(Common)
- UB
PWM
GND
HS
+ UB
M20
A28
E14
R14
B10
Bk
Bk
Br
Br
Gy
Bk
Br WW
Gy
WW
Gy
Br
Br
Br
Bk
Bl
BlW
Gy
GyBl
Bl
R
BlBr
G/Y
G/Y
Gy
Bk
RR
G/Y
G/Y
Or
Bl
Bl
Bk
Bk
Bl
Bl
BR
W
W
WW
R
R
R
Gy
Gy
Storage tank
NTC probe
(optional)
230 Vac DHW
request signal
Diverter valve
(optional)
Alpha Climatic
(optional)
36 38
41
37
6
5
39
44
3
21
R5
R6
GG
WWBk R
R
BL
G
Bk
R
Bl
G
Bk
BlRBl
BrBk
Or
W
LN
12
3
4
L2 N2
Br
Br
Bl
Bl R
Bl Bk
R
G/Y
Ch 1
Ch 2
1
2
3
4
5
230 Vac
electrical
connections
Low voltage
electrical
connections
PCB
'230 Vac DHW request signal' is alternative to
'Diverter valve' and Storage tank NTC probe
X1
X2
NC COM NO
COM
NO
Remove link to
connect switched
live to 1