Varisol Installation Manual
13
12
Wiring the Solar Control Panel
All electrical aspects of the installation should be undertaken by a qualified electrician.
Note that for safety, the pump and sensor connections should always be wired prior to
connecting power to the solar control panel.
IMPORTANT: The solar control panel must have a permanent electrical power
supply which must not be interrupted either manually or with a time switch. If the
permanent electrical supply to the building is to be switched off for any period of
time, the solar collector(s) should either be covered, or the system drained and the
tubes removed.
In order to protect the normal operation of the control panel, it should be located at least
100 mm from insulated pipes which may become hot during operation.
Control panels use PT1000 sensors containing twin core copper cable with a 0.75mm
cross section. The sensors supplied are 1.5 metres in length.
Sensor cables can be extended with twin core copper cable of 0.75mm diameter up to
50 metres and 1.50mm diameter between 50-100m. Screened cable should be used on
the sensor cables to prevent RFI from electrical cables. All connections to extend the
cables should be housed in a junction box for protection.
The following diagrams show the connection of the solar pump and other relays on the
SC range of controllers. This should be read in conjunction with the Installation and
Operation Manual supplied with each SC control panel.
Power Supply Connection:
Sensor Connection
The connection of PT1000 sensors is as shown below.
The polarity of the sensor cables is not relevant on each
sensor. The SC100 has four inputs as illustrated below.
However the SC200 and SC300 can receive five and six
sensors respectively (for larger system design) and are
connected in the same way.
Input connection
for 1-4 sensors:
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