Viessmann VITOCAL 151-A Installation And Service Instructions Manual page 52

Installation sequence
Electrical connection
Extra low voltage (ELV) connections < 42 V
Terminals Component
91.L Connection of an additional CAN bus sub-
91.GND scriber
91.H
Power supply accessories 230 V ~
Power supply of all accessories via plug 156 (230 V ~)
A
E
Fig. 42
Indoor unit terminal areas
A
40 Control unit/PCB power supply in the 230 V~
terminal area
74 PlusBus connection to connection socket
156 Power supply for PlusBus subscribers in the
HPMU electronics module
Mixer extension kit
B
52
(cont.)
B C
Explanation
Connecting the heat pump as central sub-
scriber in an external CAN bus system
Recommended connecting cable:
Pre-assembled bus cable (accessories)
■
Further information: See chapter "Integrat-
ing a heat pump into a CAN bus system".
Note
Plug 72 of the indoor/outdoor unit CAN bus
communication cable may only be connec-
ted to terminal 72.
D
Mixer extension kit
C
Mixer extension kit
D
ON/OFF switch
E