Viessmann VITOCAL 151-A Installation And Service Instructions Manual page 47

Electrical connection
Upper PCB: Bus connections and sensors
1 2 3 4 5 6 7 8
74 72
CAN L GND
PlusBus
CAN
1 2 3 4 5 6 7 8
92A
24 V
Fig. 39
BUS connections
A
Sensors
B
Luster terminals, top
A
Terminals Component
1 and 2 Connection of additional PlusBus subscrib-
74.1 ers, e.g. mixer extension kit
74.2
3 to 5 Indoor/outdoor unit CAN bus communica-
72.L tion cable connection
72.GND
72.H
(cont.)
91
CAN H CAN L GND CAN H
92B 1
NTC
24 V
10 kΩ
: BUS connections
A
9 10 11 12
9 10 11 12
9
NTC
10 kΩ
Explanation
Cores are interchangeable
Recommended connecting cable:
Unshielded data cable: 2 x 0.34 mm
■
Max. cable length: 50 m
■
Connection for integration into the internal
CAN bus system
When wiring on site, connect additional
shielding to 72.GND.
If the indoor unit only (without the outdoor
unit) is used for screed drying, plug the ter-
minator into terminal 72 between 72.L and
72.H.
Recommended connecting cable:
Pre-assembled bus communication cable
■
(accessories)
Further information: See chapter "Integrat-
ing a heat pump into a CAN bus system".
Installation sequence
B
2
47