Wiring Diagrams; Illustrated Wiring Diagram - Alpha CD25C Installation And Servicing Instructions

9

WIRING DIAGRAMS

9.1

ILLUSTRATED WIRING DIAGRAM

Fan
P
W
Bl
Bk
X12
35 36 37 38
Green LED
H1
40 41 42 43
Yellow LED
H4
Red LED
H3
Red LED H2
Pk R
Pk R
Pk Pk P Gy
Transformer
Primary
Temperature
Sensor
Br - Brown
Bk - Black
Bl - Blue
R - Red
Or - Orange
G - Green
G/Y - Green/Yellow
W - White
Gy - Grey
Pk - Pink
P - Purple
(Optional) Clock
5
4
3
R
2
1
R Bl
Br
Supply
230/240V-50Hz Fused at 3A
Link
Fuse
L N 1 2
F2A
Bk
Bl
R
Br
R
33 34 3 55 2
X1
FUSE 315 mAT
Br
11 12 13 14 X4
15 16 17 18 19
X5
Br
Bk W R
P
Gy
39
X11
S3
W
Bk
R
Diverter
R R
Valve Motor
Flue Limit Overheat
Thermostat Thermostat
Bk
W
G/Y
Br
Bl
X7
X16
29 30 31 32
L N
X6
Main
PCB
Bl
CH SET
CH CAP
DHW SET
X10
MAX CAP
44 45
X9
Or
Or
Br
Bl
Or Or
COM
Pump
NO
Primary Pressure
Switch
NOTE: TO CONNECT EXTERNAL CONTROL
REMOVE LINK FROM TERMINALS 1 & 2
AND CONNECT 230/240 V SWITCHED LIVE TO
TERMINAL1.
A FROST THERMOSTAT IS INCORPORATED
WITHIN THE MAIN PCB
Alpha CD25C/28C/35C - Wiring Diagrams
Spark
Generator
1 2
Or
R
Bk
Gy
Flame
Sensing
Electrode
W
W
R
Or
Bk
Br
Gy
Bl
21 22 23 24 25 26 27
Gas Valve
S1 S2
51 X8
46 47 48 49 50
Gy
G
Gy
G
G
G
DHW Temperature
Sensor
DHW
Flow Switch
Ignition
Electrodes
31