23
Alpha SolarSmart 150 - Wiring Diagram
9
WIRING DIAGRAM
8.14
DBU HEAT EXCHANGER
Note: Care must be taken when carrying out repairs to the DBU as it reaches very high temperatures and can emit steam
from connections when being removed.
Isolate the electrical supply before removing the casing. Undo the two screws at the top and two screws at the bottom of
the casing and pull forwards to remove. Place a bucket under the expansion relief valve and using a 6mm Allen key
remove the bolt securing the valve and remove the valve. Using a spanner turn the square shaft located above the
expansion relief valve connection until water flows from the outlet and wait for it to stop (see fig 20). Drain the water from
the cylinder as described in Section 8.1. Undo the four pipe connections on the heat exchanger and the two support
bracket nuts and remove the heat exchanger. Reassemble in reverse order using new sealing washers and refill DBU
(refer to Section 5.2).
Close cylinder drain valve and refill cylinder and check for water tightness.
Supply
230/240 V ~ 50 Hz Fused at 3 A
G/Y
G/Y
G/Y
G/Y
W
Br
Br
Br
Br
Br
Bl
Bl
Bl
Bl
W
W
Br
Br
Br
Br
Cylinder
Pump
G/Y
Bl
Br
DBU
Pump
Br - Brown
Bl
- Blue
W
- White
G/Y - Green/Yellow
NOTE:
Do not connect any other external controls
Upper Cylinder Sensor
Lower Cylinder Sensor
Solar Collector
Sensor
DO NOT
USE
8 8
1
2 3
5
4
6 7
N L 8 9
15
14
13
12
Overheat
Thermostat
(manual reset)
RED
WHITE
For latest prices and delivery to your door visit MyTub Ltd - www.mytub.co.uk - [email protected] 0844 556 1818
