Viessmann VITODENS 300 Service Instructions Manual page 3

Safety instructions
Service work on the heating system
&
Isolate the system from mains sup-
ply, e.g. by removing a separate
fuse or by means of a mains electri-
cal isolator and check that it is no
longer 'live'.
&
Safeguard the system against
unauthorised reconnection.
&
When using gas as fuel, also close
the main gas shut-off valve and
safeguard against unauthorised
reopening.
Repair work
!
Important information
Repairing components which
fulfil a safety function can com-
promise the safe operation of
your heating system.
Replace faulty components
only with original Viessmann
spare parts.
(cont.)
Ancillary components, spare and
wearing parts
!
Safety instructions
Important information
Components which are not
tested with the heating system,
the installation of non-
approved spare parts and
unauthorised conversion may
lead to damage to the heating
system, which may affect their
function and limit our warranty.
For conversions or replace-
ments, use only original spare
parts from Viessmann or those
which are approved by Viess-
mann.
3