Viessmann VITOCAL 151-A Installation And Service Instructions Manual page 54

Installation sequence
Electrical connection
Check the terminator when connecting to an exter-
nal CAN bus system
The heat pump is the first or last subscriber
Connection of external CAN bus to 12-pole terminal
■
on upper PCB, upper luster terminal, terminals 6, 7,
8
■ Do not remove the factory-fitted plug 91 in the
HPMU electronics module. This plug 91 contains the
terminator.
C
A
91
B
Fig. 44
Heat pump connected via 12-pole terminal as first
A
or last CAN bus subscriber
CAN bus cable
B
Other CAN bus subscribers
C
54
(cont.)
C
B
The heat pump is the central subscriber
In this case, 2 connections are required on the heat
pump for integration into the external CAN bus:
■ 1 Connection to upper PCB, upper luster terminal for
bus connections, terminals 6, 7, 8
1 connection in the HPMU electronics module:
■
Remove the factory-fitted plug 91. Insert the BUS
cable (accessories) into the same slot.
Or for wiring on site:
1 connection to the factory-fitted plug 91 in the
HPMU electronics module. Remove the terminator
from this plug 91.
A
C
91
B
Fig. 45
Heat pump as central CAN bus subscriber
A
CAN bus cable
B
Other CAN bus subscribers
C
C
B