Vaillant VRT 350 Operating Instructions Manual page 5

1.3.4 Risk of material damage caused by
frost
▶ Ensure that the heating installation always
remains in operation during freezing con-
ditions and that all rooms are sufficiently
heated.
▶ If you cannot ensure the operation, have a
competent person drain the heating install-
ation.
1.3.5 Frost damage caused by switching
the unit off
If you switch off the heating installation, parts
of the heating installation may be damaged by
frost.
▶ Do not disconnect the heat generator from
the power grid.
▶ Leave the heating installation main switch
in the "1" position.
0020135485_02 Operating instructions
1.3.6 Frost damage caused by excessively
low room temperature
If the room temperature is set too low in indi-
vidual rooms, sections of the heating installa-
tion might be damaged by frost.
▶ If you are absent during a frosty spell, en-
sure that the heating installation remains in
operation and the rooms are warmed ad-
equately.
▶ Please note the frost protection function.
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