Connecting The Buffer Temperature Sensors; Other Electrical Connections; Power Supply - Viessmann Vitoligno 300-C Installation And Service Instructions For Contractors

Electrical connection

Connecting the buffer temperature sensors

Plug : Buffer temperature sensors
)
Fig. 12
Assigned Function
1 Buffer temperature sensor 1 (top)
2 Buffer temperature sensor 2
3 Buffer temperature sensor 3
4 Buffer temperature sensor 4
5 Buffer temperature sensor 5
6 GND (for all 5 sensors)

Other electrical connections

Make other electrical connections according to the
"System examples" manual and the connection and
wiring diagrams from page 117.

Power supply

Power supply see page 122.
fÖ
Connect the power supply and implement all safety
measures (e.g. RCD circuit) in accordance with
IEC 60364-4-41, the connection requirements of your
local power supply utility, and VDE or national regula-
tions. Protect the power cable to the control unit with a
C 16 A max. rated MCB/fuse.
Note
Make earthing cable PE longer than the other connect-
ing cables to ensure it will not be pulled off under ten-
sion.
Power supply for DHW circulation pump
Connect DHW circulation pumps with standalone func-
tions directly to the 230 V
Mains connection via the Viessmann control unit or
Viessmann control unit accessories is not permissible.
(cont.)
∼ supply.
Additional information
Pt1000
Pt1000
Pt1000
Pt1000
Pt1000
—
Isolator
Install an isolator in the power cable to provide omnip-
olar separation from the mains for all active conduc-
tors, corresponding to overvoltage category III (3 mm)
for full isolation. This isolator must be fitted in the per-
manent electrical installation, in line with the installa-
tion requirements.
Recommended power cable
3-core cable selected from the following options:
■ 2
H05VV-F3G 1.5 mm
■ H05RN-F3G 1.5 mm 2
1. Check that the power cable to the control unit is fit-
ted with a fuse with a max. rating of C 16 A.
Installation sequence
19