Vitotronic 100, GC1B / Vitotronic 300-K, MW1B Installation and Service
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Overview of Electrical Connections
Vitotronic 100, Installation
Note: When connecting plugs aVD and aVH, bundle the
individual cores of the cables close to the terminals.
This prevents the cores from shifting into the
neighboring voltage area.
Main PCB 120V~
sÖA1 Switching output pump/shunt pump
sL Boiler pump
fÖ Power supply
fA Burner (call for heat)
gÖ Central fault message
gSA1 Isolation valve
lÖ Burner stage 2/mod.
aBÖ External connections, e.g. supplementary safety
equipment (low water cut-off)
aBA Safety chain, floating
aBH Power supply connection for accessories
Prior to making any connections ensure that the
control control and junction box have been installed as
per the boiler Installation Instructions.
Main PCB low voltage
§ Boiler water temperature sensor
aG Flue gas temperature sensor (accessory)
aJA Therm-Control temperature sensor
or
Return temperature sensor T1
(standard delivery with Vitorond, accessory for
Vitocrossal)
aJB Return temperature sensor T2 (accessory)
aVD External hook-up
aVG KM BUS participant (accessory)
aVH External hook-up
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