Viessmann VITOCAL 151-A Installation And Service Instructions Manual page 48

Installation sequence
Electrical connection
Luster terminals, top
A
Terminals Component
6 to 8 Connection of an additional CAN bus sub-
91.L scriber
91.GND
91.H
9 to 12 Do not connect anything here!
Luster terminals, bottom
Terminals Component
1 and 2 Contact humidistat, 24 V for heating/cool-
92A.1 GND ing circuit 1
92A.2 24 V
5 and 6 Outside temperature sensor
7 and 8 External heating water buffer cylinder: Tem-
perature sensor
9 to 12 Do not connect anything here!
48
(cont.)
: BUS connections
B : Sensors
Explanation
To connect the heat pump to an external
CAN bus system:
Recommended connecting cable and further
information: See chapter "Integrating a heat
pump into a CAN bus system".
The connection is routed internally to
plug 91 in the HPMU electronics module.
Note
Plug 72 of the indoor/outdoor unit CAN bus
communication cable may only be connec-
ted to terminal 72.
Explanation
Recommended connecting cable:
2 x 0.75 mm 2
■
Max. cable length: 25 m
Or
2
■ 2 x 1.5 mm
Max. cable length: 50 m
Sensor type: NTC 10 k
Ω
Cores are interchangeable
Recommended connecting cable:
2 x 1.5 mm 2
■
Max. cable length: 35 m
■
Sensor type: NTC 10 k
Ω
Cores are interchangeable
Recommended connecting cable:
2
2 x 1.5 mm
■
Max. cable length: 35 m
■