Designs; Internal Connection Diagram - Viessmann FB2A Installation And Service Instructions For Contractors

Internal connection diagram

A1 Main PCB
X... Electrical interfaces
§ Boiler water temperature sensor
$ Outlet temperature sensor
aA Ionisation electrode
aG Flue gas temperature sensor
dÖ Stepper motor for diverter valve
fJ Thermal circuit breaker
gF Ignition unit
a-Ö Fan motor
a-ÖA Fan motor control
a:Ö Modulation coil

Designs

121