Alpha CD28X - Page 32

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9.2 FUNCTIONAL FLOW WIRING DIAGRAM
Alpha CD25X/28X - Wiring Diagrams
Clock
(Optional)
1
2
3
4
Pump
Fan
Gas Valve
Primary
Temperature
Sensor
DHW Switch
Primary
Pressure
Switch
NOCOM
Spark
Generator
Overheat
Thermostat
Heat Exchanger
Thermal Fuse
Fuse
F2A
2
1
230/240V ~ 50Hz
Fuse 3A
Remove link to connect
external control
N
N
Note:
Main Terminal Block
N
L
L
DHW
Temperature
Sensor
Flue
Temperature
Sensor
Transformer
N
L
N
TO CONNECT EXTERNAL CONTROL REMOVE LINK
FROM TERMINALS 1 AND 2 AND CONNECT 240 V
SWITCHED LIVE TO TERMINAL 1.
240 Vac
24 Vac
Diverter
Valve Motor
S3 S1 S2
Main
PCB
CH CAP
MAX CAP
X7
X3
12
X8
3
21
X4
1
2
3
4
X13
4
5
32
1
X6
4
32
1
X12
453
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
CH SET
DHW SET
Green LED
Yellow LED
Red LED
Red LED
Fuse F1
315 mAT max
250 V
FuseF2andF3
2.5 AF
250 V
F1 F2 F3