Viessmann VITOTRONIC 300-K Operations Instructions download pdf (Page 20)

Vitotronic 200 and 300-K Installation and Service

5693 976 - 04

Installation Sequence

Connecting the Central Fault Message Facility

Rated voltage 120V~

Rated current max. 2 A~

External Demand via Switching Contact

Connection options:

Connection at plug aVH

Extension EA1 (accessory, see page 93)

Connection

Note: ‘Live’ contacts lead to short circuits or phase failure.

The external connection must be potential-free.

Legend

A Dry contact

B Plug aVH of the control unit

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 (coding address “06” in the “Boiler” group on the

Vitotronic 200).

Legend

A Dry contact

B Extension EA1

Codes

Plug aVH No code required.

Extension EA1 Set “5D”, “5E” or “5F” in the “General”

group to 2.

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Viessmann VITOTRONIC 300-K Operations Instructions Page 20