Viessmann B2TF Installation And Service Instructions Manual page 113

Gas condensing storage combi boiler with 7 inch colour touchscreen
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HMU heat management unit
Mains voltage output
aBH
P1 Cylinder loading pump
P2 Parametrisable output for:
DHW circulation pump
or
Circulation pump for heating circuit without
mixer
(cont.)
A
B
Connection and wiring diagram
To BCU burner control unit
To BCU burner control unit
113

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Vitodens 222-f

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