General Information; Safety Instructions; Product Information - Viessmann Cascade control unit Installation, Operating And Service Instructions

General information

Safety instructions

Please follow these safety instructions closely to prevent accidents and
material losses.
Safety regulations
Installation, initial start-up, inspection,
maintenance and repairs must only
be carried out by a competent person
(heating engineer/installation
contractor).
Observe all current safety regulations
as defined by DIN, EN, DVGW, TRGI,
TRF and VDE or locally applicable
standards.
See also the safety instructions sheet
in the Vitotec technical documentation
folder.
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
safeguard against unauthorised
reconnection.
Close the main gas shut-off valve
and safeguard against unauthorised
reopening.
Electrical components provided by
the customer must be type-tested.

Product information

Cascade control unit, part no. 7170 857, weather-compensated cascade
control for multi-boiler systems with up to four gas fired wall-mounted
boilers and one distribution pump.
2
Work on gas equipment
This must only be carried out by an
approved contractor.
Please observe all commissioning
work specified for gas installations
acc. to TRGI or TRF and all local
regulations.
Please observe all commissioning
work specified for gas systems.
Repair work
It is not permitted to carry out repairs
on parts that fulfil a safety function.
Use only original Viessmann spare
parts, or equivalent parts that have
been approved by Viessmann.
Initial start-up
The initial start-up must be carried
out by the system installer or a
designated commissioning engineer;
all actual values should be recorded
in a commissioning/service report.
Instructing the system user
The system installer must hand the
operating instructions to the system
user and instruct him/her in the
operation of the system.
¨ This symbol denotes important
information which must be
observed to prevent material
losses.