Scope Of Inspection - Viessmann Vitosol-T Service Instructions Manual

Scope of inspection

Scope of inspection
The solar thermal system should be
inspected once a year to ensure opera-
tional reliability.
In addition to this, a visual check of all
essential components (e.g. collectors
and pipework) is recommended every
three to five years.
■ Vent the solar thermal system.
■ Compare system operating pressure
with the set value. If the values are dif-
ferent, check the expansion vessel.
■ Check heat transfer medium.
■ Start circulation pump manually if nec-
essary (listen for noises).
■ Compare flow rate with set value.
■ Check thermostatic mixing valve is
moving easily (if installed).
■ Check plausibility of the solar param-
eters subject to the solar radiation (e.g.
flow and return temperatures at the
thermometers; collector and cylinder
temperatures at the solar control unit).
The safety valve does not have to be
checked if there are no visible signs of
use (e.g. deposits, drips).
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