Viessmann Vitocal 252-A Series - Page 68

68
Extra low voltage (ELV) terminal area < 42 V
91
917274
1 2 3 4 5 6 7 8 9 10 11 12
CAN HCAN L GND
PlusBus
1 2 3 4 5 6 7 8 9 10 11 12
92A 92B
NTC
10 kΩ
NTC
10 kΩ
CAN
24 V 24 V
CAN HCAN L
A
B
Fig. 53
A
BUS connections
B
Sensors
Upper luster terminal
A
: BUS connections
Terminals Component Explanation
1 and 2
74.1
74.2
Connection of additional PlusBus subscrib-
ers, e.g. mixer extension kit
Cores are interchangeable
Recommended connecting cable:
■
Unshielded data cable: 2 x 0.34 mm
2
■
Max. cable length: 50 m
Electrical connections
Electrical connection of the indoor unit (cont.)
6222080
Installation