Viessmann VITOTRONIC 100 Installation And Service Instructions Manual page 159

Main PCB low voltage
§
Boiler water temperature
sensor
%
Cylinder temperature sensor
(accessories) / cylinder
temperature sensor 2 for a
cylinder storage system
aG
Flue gas temperature sensor
(accessories)
aJA Temperature sensor of
Therm−Control
or
Temperature sensor T1
aJB Temperature sensor T2
or
Temperature sensor
cylinder storage system
aVD External hook−up
aVG KM BUS user (accessories)
aVH External hook−up
LON Interconnecting cable for data
exchange between control
units
S3 Emissions test switch "S"
V1 Fault indicator (red)
V2 ON indicator (green)
Connection and wiring diagrams
(cont.)
159