Connecting The Central Fault Message Facility; External Blocking Via Switching Contact - Viessmann VITOTRONIC 200 Installation And Service Instructions Manual

Installation Sequence

Connecting the Central Fault Message Facility

Note: Maximum pump and alarm output is 6 FLA shared between all 120V outputs.
External Demand via Switching Contact
Legend
A Dry contact
B Plug aVH of the control unit
Legend
A Dry contact
B Extension EA1
22
Vitotronic 200, HO1B and 300-K, MW2C Installation/Service
Rated voltage
Rated current
Connection options:
Connection at plug aVH
Extension EA1 (accessory, see page 106)
Connection
Note: 'Live' contacts lead to short circuits or phase failure.
The external connection must be potential-free.
When the contact is closed, burner operation is load-
dependent. The supply water is heated to the value set
in the coding address "9b" in the "General" group on the
Vitotronic 300-K.
The supply water temperature is limited by this set value
and the electronic supply temperature maximum limit.
Codes
Plug aVH Set address 9b in General group.
Extension EA1 Set "5d", "5e" or "5f" in the "General"
group to 2.
120V~
max. 2 FLA