Viessmann VITODENS 300 WB3A Service Instructions Manual page 2

Safety instructions
Please follow these safety instructions closely to prevent accidents and
material losses.
Safety instructions explained
!
Important information
This symbol warns against the
risk of material losses and
environmental pollution.
Note
Details identified by the words "Note"
contain additional information.
Safety regulations
Installation, initial start-up, inspection,
maintenance and repairs must be car-
ried out by a competent person
(heating engineer/installation contrac-
tor).
Observe all current safety regulations
as defined by DIN, EN, DVGW, TRGI,
TRF, VDE or all locally applicable
standards.
See also the safety instructions in the
Vitotec Technical Guide folder.
2
Before working on the equipment/
heating system, isolate the mains
electrical supply (e.g. by removing a
separate mains fuse or by means of a
mains electrical isolator) and safe-
guard against unauthorised reconnec-
tion.
Close the main gas shut-off valve and
safeguard against unauthorised
reopening.
Electrical assemblies provided on site
must be type-approved.
Work on gas equipment
This must only be carried out by an
approved gas fitter.
Observe all commissioning work spe-
cified for gas installations to TRGI or
TRF and all local regulations.
Please observe all commissioning
work specified for gas systems.