DE DIETRICH INISOL UNO-2 …, UNO-1 … - Manual (Page 16)

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UNO/2 200, 300, 400, 500 - UNO/1 200, 300, 400, 500 06/02/12 - 300024525-001-B
6 Checking and maintenance
6.1 Solar installation
We recommend that you take out a preventive maintenance contract
to check the fluid level, antifreeze protection, pressure in the system,
leak test and general operation every year or every two years.

It is imperative to drain the solar circuit before any work is
carried out.
6.2 Tank
6.2.1 Magnesium anodes
The magnesium anode must be checked by a qualified professional
at least every 2 years.
6.2.2 Safety valve or safety unit
Have the condition of the anode checked after the first year. The
magnesium anode must be checked by a qualified professional at
least every 2 years.
6.2.3 Descaling
In hard water regions, it is advisable to ask the fitter to descale the
DHW tank exchanger once a year in order to maintain its level of
performance.
6.2.4 Casing
The casing of the DHW tank can be cleaned with soapy water.
6.2.5 Vent device
If the vent device is not used, the installer must check the seal on the
top vent connection.
6.3 Solar circuit
To check operation of the solar system, consult the display on the
control system. A steady red indicator light in fine weather indicates
a malfunction.
The pressure in the solar circuit can be checked on the solar station's
pressure gauge. If the pressure shown is lower than 0.5 bar, call the
installer.

Never carry out work on the solar circuit yourself. Never
work on the safety valve yourself.