Alpha CD12S - Illustrated Wiring Diagram; Wiring Diagrams

35
Alpha CD12S/20S/28S - Wiring Diagrams
9.1 ILLUSTRATED WIRING DIAGRAM
9 WIRING DIAGRAMS
Br - Brown
Bk - Black
Bl - Blue
R - Re d
Or - Orange
G - Gr een
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
G
G/Y
Or
Or
Bl Br
Heat Exchanger
Thermal Fuse
W/Bl
Bk
Flue Temperature
Sensor
Y
Y
S3 S1 S2
Main
PCB
CH CAP
MAX CAP
Br
Bl
X7
Bl
P
Bk
Bk
W
R
Gy
Br
Bk
R
Bl
Br
Gy
W
R
Or Y
R
Or Y
Gy
G
W/Bl
W/Bl
Pk
Pk
Br Bk Bl W P
Fuse
F2A
Link
Supply
230/240V-50Hz Fused at 3A
21NL
Pump
BrBl
Gas Valve
Overheat
Thermostat
X3
1 2
X8
3
2 1
X4
1
2
3
4
X13
4
5
3 2
1
X6
4
3 2
1
X12
45 3
2
1
X15
4
6
5
2
3
1
X9
4
6
9
5
8
2
3
7
10
1
X11
4
6
5
8
2
3
71
W
Gy
5
4
3
2
1
Br
Bk
Bl
(Optional) 2 Channel Clock
21
Spark
Generator
Transformer
Pk PPk G
240 Vac
24 Vac
CH SET
DHW SET
Primary
Pressure
Switch
Or
Or
NO
COM
Primary
Temperature
Sensor
RR
G/Y - Gr een/Yellow
W - Whit e
Gy - Grey
Pk - Pink
P - Purple
W/Bl- White/Blue
Br
Bk
Bl
W
P
Fan
Flame
Sensing
Electrode
43
Ignition
Electrodes
Green LED
Yellow LED
Red LED
Red LED
Fuse F1
315 mAT max
250 V
Fuse F2 and F3
2.5 AF
250 V
F1 F2 F3