Viessmann Cascade control unit Installation, Operating And Service Instructions page 6

Installation and connections
Electrical connections
Vitotronic 050 heating circuit control
unit
Connect via Viessmann 2 wire BUS
in accordance with the diagram
(see page 5).
S1
4
B
A
C
A Cascade control unit
B Vitotronic 050 with communications
module Viessmann 2 wire BUS,
part no. 7143 710
C Connection cable Viessmann
2 wire BUS, part no. 7174 994, for
connecting the cascade control
unit with the first Vitotronic 050
D Connection cable Viessmann
2 wire BUS, part no. 7814 624, for
connecting the first Vitotronic 050
with the further Vitotronic 050
Set the differential temperature
between the boiler water and the set
flow temperature at Vitotronic 050.
Code "9F:8" (as delivered condition)
must be set.
If the outside temperature for
Vitotronic 050 is to be adopted from
the cascade control unit, set code
"97:1".
Distribution pump
Connect acc. to diagram (see
page 5).
Connection load capacity:
max. 4 A 230 V~.
6
(cont.)
S1
5
B
D D
Fault indication
H Fault message contact (volt-free)
at mains voltage potential
230 V~, 1 (0.5) A
Plug the separator in (see page 5)
to the right of terminal block "17/18".
H Fault message contact (volt-free) at
safety low voltage 24 V /~, 2 A
Plug the separator in (see page 5)
to the left of terminal block "17/18".
¨ Strip a minimum length of
insulation off the cable.
Connect in accordance with the
diagram (see page 5).
Mains electrical connection
Connect the supplied mains cable in
accordance with the diagram (see
page 5).