Viessmann Vitocal 252-A Series - Page 70

70
Lower luster terminal
B
: Sensors
Terminals Component Explanation
1 and 2
92A.1 GND
92A.2 24 V
Contact humidistat, 24 V for heating/cool-
ing circuit 1
Note
Use only 230 V~ contact humidistat in con-
junction with external buffer cylinder. In this
case, the contact humidistat is connected
to the mixer extension kit of the respective
heating/cooling circuit (ADIO electronics
module).
Recommended connecting cable:
■
2 x 0.75 mm
2
Max. cable length: 25 m
Or
■
2 x 1.5 mm
2
Max. cable length: 50 m
3 and 4
92B.3 GND
92B.4 24 V
Only for indoor unit with 2 integral heating/
cooling circuits:
Contact humidistat, 24 V for heating/cool-
ing circuit 2
Note
Use only 230 V~ contact humidistat in con-
junction with external buffer cylinder. In this
case, the contact humidistat is connected
to the mixer extension kit of the respective
heating/cooling circuit (ADIO electronics
module).
Recommended connecting cable:
■
2 x 0.75 mm
2
Max. cable length: 25 m
Or
■
2 x 1.5 mm
2
Max. cable length: 50 m
5 and 6 Outside temperature sensor Sensor type: NTC 10 kΩ
Cores are interchangeable
Recommended connecting cable:
■
2 x 1.5 mm
2
■
Max. cable length: 35 m
7 and 8 Only for indoor unit with 1 integrated heat-
ing/cooling circuit:
Temperature sensor, external buffer cylin-
der
Sensor type: NTC 10 kΩ
Cores are interchangeable
Recommended connecting cable:
■
2 x 1.5 mm
2
■
Max. cable length: 35 m
Electrical connections
Electrical connection of the indoor unit (cont.)
6222080
Installation