Viessmann Vitotronic 100 GC1 Installation And Service Instructions Manual page 16

Heating system designs
System version 4
Controlling the return temperature with a low loss header and a three-way mixing valve
Vitorond 200
1
28
5
21
C
A Boiler with Vitotronic 100, GC1
B Vitotronic 300-K, MW1S
C DHW tank
Plug
!
Outdoor temperature sensor
?
Supply temperature sensor
common heating supply
?M2/M3Supply temperature sensor
mixing valve circuit 2 or 3
§
Boiler temperature sensor
%
DHW tank temperature sensor
aJA
Temperature sensor T1
sÖM2/M3Heating circuit pump mixing
valve circuit 2 or 3
16
2
20 M2
52
2
B
20 M3
52
3
17A
T1
A
E Low loss header
D Mixing valve circuit
sA
DHW pump
sK
DHW recirculation pump
sL
Boiler circuit pump
fÖ
Power supply, 120 VAC
60 Hz
fA
Burner (burner stage 1)
gSA1
Three-way mixing valve
gSM2/M3Mixing valve actuator
circuit 2 or 3
lÖ
Burner
(burner stage 2/mod.)
E
3
17A
aVD/aVH External connections
D D
T1
A
(see page 39)