Viessmann VITOCAL 151-A Installation And Service Instructions Manual page 53

Electrical connection
Some accessories with direct power supply
A
E
Fig. 43
Indoor unit terminal areas
A
40 Control unit/PCB power supply in the 230 V~
terminal area
74 PlusBus connection to terminals
156 Power supply for PlusBus subscribers in the
HPMU electronics module
Mixer extension kit
B
Integrating a heat pump into a CAN bus system
The Viessmann CAN bus is designed for "line" bus
■
topology with a terminator at both ends.
■ With CAN bus, the transmission quality and the
cable lengths depend on the electrical properties of
the cable.
Only use one cable type within a CAN bus.
■
Integration into the internal CAN bus system:
■ Recommended cable for connection to the internal
CAN bus system:
Indoor/outdoor unit bus communication cable (acces-
sories), fully wired, in 5, 15 or 30 m lengths
For wiring on site:
■
For both plugs, also connect the shielding to the
"GND" connection.
If required, remove the terminator from terminal 72.
Recommended cable type (on site):
CAN bus cable
Cable cross-section
■
Characteristic impedance
■
Max. length
■
Alternative cable types (on site):
CAN bus cable
Max. length
■
CAN bus cable
Max. length
■
(cont.)
B C D
Mixer extension kit
C
Mixer extension kit
D
ON/OFF switch
E
Integration into an external CAN bus system:
■ Recommended cable for connection to an external
CAN bus system:
Bus cable (accessories), fully wired, in 5, 15 or 30 m
lengths
For wiring on site:
■
Only use cable types listed in the following table.
In line with ISO 11898-2, twisted pair cable, shielded
2
0.34 to 0.6 mm
95 to 140
Ω
200 m
2-core, CAT5, shielded
50 m
2-core, CAT7, shielded
200 m
Installation sequence
53