Viessmann GC1 - Connecting the Central Fault Message Facility; External Demand Via Switching Contact

Vitotronic 100, GC1B / Vitotronic 300-K, MW1B Installation and Service
5793 309 - 05
80
Vitotronic 300-K, Installation
External Demand Via Switching Contact
Connection options:
H Plug aVH
H Extension EA1 (accessory, see page 160)
Connection
Note: ‘Live’ contacts lead to short circuits or phase
failure. The external connection must be floating.
Codes
Plug aVH
Extension EA1
No code required. Set “5D”, “5E” or “5F” in the “General” group to 2.
Legend
A Floating contact
B Plug aVH of the control unit
Legend
A Floating contact
B Extension EA1
With the contact closed, the boiler burners are started
subject to load. They heat to the set supply temperature
selected in coding address “9B” in the “General” group.
The temperature is limited by this set value and the
electronic maximum supply temperature limit (coding
address “37” in the “Cascade” group).
Connecting the Central Fault Message Facility
Rated voltage 120V~
Rated current max. 2A~