Connections To Terminal Aba - Viessmann Vitotronic 300 GW6B Installation Instructions Manual

Electrical Connections

Connections to Terminal aBA

Legend
A DIN rail (junction box)
B Auxiliary low gas pressure switch or external shut-off (dry contact)
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Vitotronic 300, GW6B Installation and Service
Low gas pressure switch/external shut-off
1. Remove jumper between terminals 26 (L) and 27(L).
2. Connect auxiliary low gas pressure switch or external
shut-off (dry contact) to terminals 26 (L) and 27(L).
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.
Note: The heating system has no frost protection while it
is blocked. The boiler is not held at the lower boiler
water temperature.
Refer to the low gas pressure switch
Installation Instructions