Viessmann VITOTRONIC 100 GC1B Service Manual Page 42

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Installation
42
Overview of Electrical Connections
Low voltage connections (motherboard)
§ Boiler temperature sensor (KTS)
% DHW tank temperature sensor
aG Flue gas temperature sensor
aJA Return temperature sensor T1
aJB Return temperature sensor T2
aVD Connection of external
equipment
aVG KM BUS participant
aVH Connection of external
equipment
Line voltage connections (motherboard)
A1Control output
sA DHW pump
sL Shunt pump or
boiler circuit pump
Power supply connection
fA Burner (1st stage)
Compiled failure alarm
gS A1Return valve
or
Isolation/modulating valve
Burner (2nd stage/modulating)
aBÖ Connection of external
equipment, e.g. additional
safety equipment
aBA Safety circuit, potential free
aBH Power supply connection for
accessories
5351 338 v1.6
145
17
17
5
3/2
15
143
146
B
A
90
41
151
150
A1/M1
A1/M1
21
52
20
29
50
40
156
156
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