76
Extra low voltage (ELV) connections < 42 V
Terminals Component Explanation
91.L
91.H
Connection of an additional CAN bus sub-
scriber (Viessmann appliance),
e.g. Vitocharge VX3
Integration of the heat pump as central sub-
scriber into an external CAN bus system
Recommended connecting cable:
■
Pre-assembled bus cable (accessories)
For further information: See chapter "Con-
necting with other Viessmann appliances via
the CAN bus".
Do not connect CAN Ground (GND)!
Note
Plug 72 of the indoor/outdoor unit CAN bus
communication cable may only be connec-
ted to terminal 72.
Power supply, accessories, 230 V ~
Power supply to all accessories via plug 156 (230 V~)
74
74
40A
40
74
74
40A
40
B C
74
40
156
A
74
74
40A
40
D
E
Fig. 56
A
Indoor unit terminal areas
40 Control unit/PCB power supply in the 230 V~
terminal area
74 Connecting PlusBus to the upper luster termi-
nal in the low voltage (ELV) < 42 V terminal
area
156 Power supply for PlusBus subscribers in the
HPMU electronics module
B
Mixer extension kit
C
Mixer extension kit
D
Mixer extension kit
E
ON/OFF switch
Electrical connections
Electrical connection of the indoor unit (cont.)
6222080
Installation
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