Viessmann VITOTRONIC 100 GC1 Installation And Service Instructions Manual page 13

Circuit Diagram 4
Single-boiler system with shunt pump and return valve for elevating the return temperature
in conjunction with Vitorond 200, VD2
21
5
B
A Boiler with Vitotronic 100, GC1
B Domestic hot water tank
C Heating circuit with mixing valve
*1
On the Vitorond the boiler supply and return are at the rear of the boiler.
T2
17B
17A
3
T1
*1
A
Plugs
§
Boiler temperature sensor
%
DHW tank temperature sensor
(accessory)
aJ A Temperature sensor T1
aJ B Temperature sensor T2
sA
DHW pump
sL
Shunt pump
Heating system types
C C
fÖ
Power supply connection,
120 VAC
fA
Burner (1st stage)
gS A1 Mixing valve motor for raising
the return temperature
lÖ
Burner (2nd stage/modulating)
aVD
Connection of external
equipment (see page 60)
aVH
Connection of external
equipment (see page 60)
13