Viessmann Vitodens 300 Service Instructions Manual page 108

Type wb3a, 49 and 66 kw gas fired wall mounted condensing boiler natural gas and lpg version
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Designs
Connection and wiring diagrams – internal connectio . . .
aG
Flue gas temperature sensor
dD
Flow switch
fJ
Temperature limiter
108
gF
Ignition unit
a-Ö Fan motor
aNF Differential pressure sensor
(cont.)

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