Alpha E-Tec Plus 28NX - Wiring Diagram

9.1 ILLUSTRATED WIRING DIAGRAM
9 WIRING DIAGRAM
Alpha E-Tec Plus 28NX, 33NX and 38NX - Wiring Diagram
Colour Code
Bk ......Black
Bl .......Blue
Br ....... Brown
G ........Green
Gy ...... Grey
G/Y ....Green/Yellow
Or.......Orange
P ........Purple
R ........ Red
W .......White
Y ........Yellow
Component identification
A35 ............... Control panel
Alpha bus ...... Climatic (optional) or Smartech Plus (optional) or OT remote control
(optional). Remove link between 1 and 2 if used
B1 ................. Flow sensor
B1 -2 ............. System flow sensor (optional)
B2 ................. DHW sensor
B4 ................. External sensor (optional)
B5 ................. Return sensor
B8 ................. Pressure sensor
B9 ................. DHW inlet sensor (optional)
B27 ............... Double flue sensor
E3 ................. Ignition and detection electrode
K70 ............... Configurable relays
M1................. Boiler pump
M20............... Fan
M30............... 3 - way stepper motor
S20 ............... Room thermostat (optional)
S4 ................. DHW flow switch
X40 ............... Room thermostat link
X70 ............... Safety thermostat low temperature link - configurable input 2
X80 ............... Configurable input 1 link
Y1 ................. Gas valve
66
6
66
11
1
11
X9 X10
X15
X6
X17
X14
X13
9
1
X3
4
X22
1
X8
X2
X1
9
1
10
1
4
1
X5
1
5
X23
Fuse
3.15 AF
F2
E3
Y1
B1
B8
S4
M1
B5
B2
M20
M30
K70
S20
X40
M
A35
3
1
4
2
230V ac
50Hz
+t
L
NAB
12
5
6
X70X80
B4
B9
B1-2
14
15 40
41 47
48 38 39
21
BA
X20
X26
X21
RELAY BOARD
(optional)
50 5152 53
54
55
56
57
58
+p
GND
OUT
IN
PWM
GND
OUT
L
N
Bl
Br Bk
R
G/YG/Y
Bl
Bl Br
P
R
Y
Bl
Bk
Br
Br
G
Y
Bk
R
Bl
Br
Bk
Gy
Or
Gy
RBr
Y
Bk
Bk
G/Y
Bl
Y
Bk
Br
Y
Br
R
Bk
Br
Bl
Bk
Or
R
Gy
Gy
Bk
Or
R
Gy
P
P
G
G
Y
Y
Or
Or
Bl
Bl
R
R
W
W
P
P
G
G
P
W
Bl
W
R
Bl
Br
G/Y
G/Y
GND
HS
+V
-UB
+UB
G
GP
PY
Y
Or
Or
Gy
WBk
P
Bl
G/Y
Bk
R
Br
Bl
G/Y
Bk
Br
R
Bl
MAIN PCB
Mains Supply
230 V ~ 50 Hz
24
25
44
D+ D-
41
24V dc
Alpha
Bus
TEST
Bk
R
Br
Bl
Y
G
60