5Operating and Installation Manual for Solar Module VR 68 0020054784_00
3 Safety instructions and
regulations
The VRT 68 solar module must be installed by a
recognised expert technician company that is also
responsible for ensuring that existing standards and
regulations are observed.
We accept no liability for any damage caused by failure
to observe these instructions.
3.1 Safety instructions
e
Danger!
Danger due to live connections!
When working on the open VR 68 mixer module
and also inside the boiler's electronic box
there is a danger of potentially fatal electric
shock.
Switch off the power supply and prevent it from
being unintentionally switched back on before
carrying out work on the VR 68 solar module
and inside the electronic box of the boiler.
Switch off the power supply at the VR 68 solar
module via the mains switch. The green LED on
the PCB of the VR 68 solar module must not
light up.
Danger!
Risk of scalding by hot water!
The temperature of the solar hot water cylinder
can reach temperatures that are considerably
higher than 60 °C (not only due to the solar
heating, but also the legionella protection
function if it is active).
Make absolutely sure that your expert
technician installs a mixer valve with cold water
supply (see hydraulic diagram).
Have the mixer valve adjusted by your expert
technician.
3.2 Regulations
Standard wires must be used for wiring.
230 V lines must be sheathed cables (e.g. NYM 3x1.5).
Flexible cables must not be used for 230 V lines.
Minimum cross-section of the wires:
– Connection line 230 V
(pumps or multifunction relay output) 1.5 mm
2
– Low-voltage leads
(sensor or Bus leads) 0.75 mm
2
The following maximum cable lengths must not be
exceeded:
- Sensor connection 50 m
- Bus lead 300 m
Where sensor and BUS lines run parallel with 230 V
cables for more than 10 m, they must be routed
separately.
All connection lines must be fastened inside the casing
using the enclosed cable brackets.
Do not use free terminals of the appliances as support
terminals for other wiring.
The VR 68 solar module must be installed in dry rooms.
All wiring must be in accordance with Building
Regulations Part P and BS 7671 (IEE Wiring Regulations),
and must be carried out by a suitably qualified person.
Safety instructions and regulations 3
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