Viessmann VITOTRONIC300 Installation And Service Instructions Manual page 5

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
Designs
Components
Parts Lists
Specification
Sensors.................................................................124
Outside Temperature Sensor...............................125
Flue Gas Temperature Sensor..............................125
Extension Kit, Mixing Valve......................................126
Extension EA1 Accessory (optional)..........................127
Type GW2B..........................................................128
Specifications........................................................129
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