Boiler Control Base - Viessmann B2TB004 Installation Instructions Manual

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Boiler Connections
Vitodens 222-F, B2TB 19, 35, 68, 125 Installation
Connections
(continued)

Boiler control base

Note: See wiring diagram on page 20 for connection to
the external accessory connection box.
OUTDOOR
TEMPERATURE
SENSOR
21

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Vitodens 222-fB2tb123

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