Vitotronic 100, GC1B / Vitotronic 300-K, MW1B Installation and Service
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Vitotronic 100, Installation
Connections to Terminal aBA
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.
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.
External Burner Blocking
150
Remove jumper from DIN terminals 16 and 17.
Note: Connect only safety shutdown equipment (dry
contact), e.g. a combustion air device adaptor, to
these terminals.
Opening this contact leads to a burner control shutdown.
Note: The heating system has no frost protection during
blocking. The boiler is not held at the lower boiler
water temperature.
Note: ‘Live’ contacts lead to short circuits or phase
failure. The external connection must be floating.
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