Viessmann VITOTRONIC 200 Installation And Service Instructions Manual page 104

Designs
Connection and Wiring Diagrams
Legend
? M2/M3 Supply temperature sensors
sÖ M2/M3 Heating circuit pumps
Power supply
fÖ
gS M2/M3 Mixing valve motors
K1-K6 Relay
X Electrical interfaces
104
Vitotronic 200, HO1B and 300-K, MW2C Installation/Service
(continued)
PCB, extension for heating circuits 2 and 3 with mixing valve