Technical data

5693 973 - 05

Vitotronic 300, GW5B & MW1B Installation and Service

External Demand via 0–10V Input

Connection at input 0 – 10V at extension EA1

(see page 113).

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.

Installation, Vitotronic 300-K

Note: The heating system has no frost protection during

blocking. The boilers are not held at the lower boiler

water temperature.

Codes

Plug aVD

Extension EA1

Set coding address “99” in the “General” group, which

the input should influence.

Set “5D”, “5E” or “5F” in the “General” group to 3 or 4.

External Blocking via Switching Contact

Connection options:

H Plug aVD

H Extension EA1 (accessory, see page 113)

Connection

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

failure. The external connection must be floating.

Legend

A Floating contact

B Plug aVD of the control unit

Legend

A Floating contact

B Extension EA1

With the contact closed, the burners of all boilers will be

subject to a control shutdown.

Any connected shunt or distribution pump is stopped.

Shut-off devices are closed.