Connections To Terminal Abö (Vd2/Vd2A/Ct3 Only) - Viessmann VITOTRONIC 100 GC1 Installation And Service Instructions Manual

Connections to Terminal aBÖ (VD2/VD2A/CT3 only)
A Jumper
B External shut-off (dry contact)
Installation
External shut-off
1. Remove jumper between terminals
16 and 17.
2. Connect dry contact.
Controlled switch-off takes place
when the contact is opened.
CAUTION
The terminals should be used for
safety switch-off purposes only (e.g.
through a limit thermostat). See
pages 52 to 59 for details of
controlled switch-off.
During switch-off, there is no frost
WARNING
protection of the heating system and
the boiler is not kept at the minimum
boiler water temperature.
Emergency operation
Move jumper from terminals 16 and 17
to terminals 17 and 18.
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