Wiring Diagrams; Illustrated Wiring Diagram - Alpha CD50 Installation And Servicing Instructions

9

WIRING DIAGRAMS

9.1

ILLUSTRATED WIRING DIAGRAM

Or
Bk
R
N A
R
Diverter Valve
Fan
Br
W
Bk
Or
Bl
FUSE 315 mAT
11
12 13
Bk
Bl
W
Or
X12
35 36 37
Green LED H1
40 41 42
Yellow LED H4
Red LED H3
Red LED H2
Pk R
Pk
Pk Pk P Gy
Transformer
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
Br
Bl
Supply
230/240V-50Hz Fused at 3A
Fuse
L N 1
F2A
Bl
R
Br
R
33 34
X1
14
X4 R
Bk
Or
Br
15 16 17 X5 18 19
P
Br
Gy
Bl
38 39
43 X11
R
Br
Bl
R R
Primary
Temperature
Sensor
Overheat
Thermostat
Flue Limit
Thermostat
Bk
Link
2
G/Y
Bk
Br
Bl
X16
3 55 2
29 30 31 32
L N
Main
PCB
X6
CH CAP
DHW SET CH SET
+
+ +
X10
+
MAX CAP
X9 44 45
Or
Or
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
Spark
Generator
1
Or
R
Bk
W
Gy
Flame
Sensing
Electrode
W
R
Or
Bk
Gy
X7 23 26
21 22 24 25 27
S10 S3 S2 S1
Gas Valve
S1 CH set jumper
S2 CH timer jumper
S3 DHW temp off
S10 Range fan speed
X8
46 47 48 49 50 51
G
G Bl
G
G
DHW Temperature
Sensor
Alpha CD50 - Wiring Diagrams
2
Ignition
Electrodes
W
Br
Bl
33