Vaillant HOME SYSTEM 12 -A Operating Instructions Manual page 6

1 Safety
▶ Ensure that the supply of
combustion air is always free
of fluorine, chlorine, sulphur,
dust, etc.
▶ Ensure that no chemical sub-
stances are stored at the in-
stallation site.
1.3.11 Risk of material
damage caused by
frost
▶ Ensure that the heating in-
stallation always remains in
operation during freezing con-
ditions and that all rooms are
sufficiently heated.
▶ If you cannot ensure the op-
eration, have a competent
person drain the heating in-
stallation.
6
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