Viessmann VITOTRONIC300 Installation And Service Instructions Manual page 123

Weather-compensated, digital boiler control units for use with boiler models vd2a, vd2 and ct3
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Vitotronic 300, GW2B Installation and Service
Connection and Wiring Diagram, Type GW2B
PCB, extension for heating circuits 2 and 3 with mixing valve
Legend
?
Supply temperature sensors
Heating circuit pumps
Power supply
(continued)
gS
Mixing valve motors
K1-K6 Relay
X
Electrical interfaces
Designs
123

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