17
3.5 Electrical Installation
If connecting to an unvented cylinder, the pump station
MUST
be connected via an external
wiring centre and an energy cut-out devise
MUST
be installed in order to comply with the
Building Regulations. This
MUST
take the form of a 2-port motorised valve (not supplied)
wired through a manually-reset high limit thermostat (not supplied). If in doubt, consult the
cylinder manufacturer.
Only
if connecting to an
open-vented cylinder
can the pump station be connected directly
to the system controller as described in the controller instruction booklet.
3.5.1 Mount controller
Install the solar system controller (SSC~) in an appropriate location as described in the
instructions supplied. Connect the wiring centre and user interface as instructed. Connect a
permanent live supply to the wiring centre, via a fused spur isolator.
3.5.2 Connect external wiring centre
Specify an appropriate 5-wire motorised valve (not supplied) and connect it as shown.
Connect the high limit thermostat of the solar cylinder to the wiring centre, so that power to
the motorised valve would be interrupted should the high limit thermostat trip. Wire the pump
inside the pump station as shown.
Figure 17: Wiring layout with external wiring centre
B
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B
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G
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/Y
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G
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Brown
Blue
Green/Yellow
B
ro
w
n
B
lu
e
B
ro
w
n
B
lu
e
G
re
e
n
/Y
e
llo
w
B
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G
re
y
B
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G
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/Y
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O
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Dual-line Pump
Station (SDPS~)
Pump
External Wiring Centre
(not supplied)
SSC~ Control Unit
P1
Permanent
Mains Supply
(via fused spur)
Cylinder
High Limit
Thermostat
(not supplied)
Motorised Valve
(on pipework to solar coil)
Diagram supplied for guidance only.
Detailed instructions on how to wire the high limit
thermostat of the solar cylinder should be sought
from the cylinder manufacturer’s instructions, as
differences may exist between products.
