Technical data

34
Installation – Vitotronic 100, GC1
Summary of electrical connections
Low voltage connections (motherboard)
§ Boiler temperature sensor
% No function
aG Flue gas temperature sensor
(accessory)
aJA Therm-Control temperature
sensor
or
return temperature sensor T1
(accessory)
aJB Return temperature sensor T2
(accessory)
aVD External connection
aVG KM BUS participant, e.g. plug-in
adaptor for external safety
equipment
aVH External connection
Line voltage connections (motherboard)
sÖ A1 Switched output
sA No function
sL Shunt pump (on site)
or
boiler circuit pump (on site)
fÖ Power connection
fA Burner (burner stage 1)
gÖ Central fault message
gS A1 Isolation valve
or
actuator for three-way mixing
valve for return temperature
control
lÖ Burner (burner stage 2 / mod.)
aBÖ External connections,
e.g. supplementary safety
equipment
aBA Safety circuit, potential free
aBH Power supply for accessories
5351 340 v1.4
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