Viessmann VITODENS 100-W Installation And Service Instructions Manual page 70

Wall mounted gas condensing boiler
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Connection and wiring diagram
(cont.)
Fig. 36
A1 HBMU heat management unit
A3 Programming unit
X... Electrical interfaces
H
Flow switch
70
Flue gas temperature sensor
K
Boiler water temperature sensor
L
Outside temperature sensor
M

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