Viessmann VITOTRONIC 100 GC1 Installation And Service Instructions Manual page 19

Circuit Diagram 7
Multi-boiler system with return valve for return temperature protection
in conjunction with Vitorond 200, VD2
B
A Boiler with Vitotronic 100, GC1
B Domestic hot water tank
C Heating circuit with mixing valve
3
17A
T1
A
Plugs
§
Boiler temperature sensor
aJ A Temperature sensor T1
sL
Boiler circuit pump
fÖ
Power supply connection,
120 VAC
fA
Burner (1st stage)
gS A1 Return valve
Heating system types
C C
3
17A
T1
A
lÖ
Burner (2nd stage/modulating)
aVD
Connection of external
equipment (see page 60)
aVH
Connection of external
equipment (see page 60)
19