Connections To Terminal 150; Connections To Terminal 151 - Viessmann VITOTRONIC 300 Installation And Service Instructions Manual

Vitotronic 300, GW5B & MW1B Installation and Service
Connections to Safety Equipment
Connections to Terminal aBA
Legend
A Jumper
B External shut-off (dry contact)
Installation, Vitotronic 300, GW5B
1. Connect the external safety equipment in series.
Legend
A DIN rail
B Low water cutoff
C Other safety controls
External shut-off
1. Remove jumper between terminals 19 and 20.
2. Connect dry contact. Controlled switch-off takes place
when the contact is opened.
WARNING
The terminals should be used for safety switch-off
purposes only (e.g. through a high limit thermostat).
During switch-off, there is no frost protection of the
heating system and the boiler is not kept at the minimum
boiler water temperature.
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