External Demand Via 0-10V Input; External Blocking Via Switching Contact - Viessmann VITOTRONIC 200 Installation And Service Instructions Manual

Vitotronic 200, HO1B and 300-K, MW2C Installation/Service
External Demand via 0 - 10V Input

External Blocking via Switching Contact

A Dry contact
B Plug avD of the control unit
Legend
A Dry contact
B Extension EA1
Demand for a system supply temperature set value.
Connection to input 0 -10V at extension EA1 (accessory).
See page 106.
0 - 1V no default set supply temperature
1V set value 50°F (10°C)
10V set value 212°F (100°C)
Observe coding address "1e" in the "General" group.
Optional
Temperature range from 86 to 248°F
(30 to 120°C):
0 - 1V no default set supply temperature
1V set value 86°F (30°C)
10V set value 248°F (120°C)
Connection options:
Connection at plug avD
Extension EA1 (accessory, see page 106)
Connection
Note: 'Live' contacts lead to short circuits or phase
failure.
The external connection must be potential-free.
The burner is shut down when the contact is closed.
The boiler circuit pumps are switched off.
Note: The heating system has no frost protection while
it is blocked.
The boiler is not held at the lower boiler water
temperature.
Codes
Plug avD Set coding address "99" in the "general"
group.
Extension EA1 Set "5d", "5e" or "5f" in the "General"
group to 3 or 4.
Installation Sequence
23