Gram Bcu Burner Control Unit - Viessmann Vitodens 200-W B2HE Installation And Service Instructions Manual

Connection and wiring diagram
BCU burner control unit
Fig. 71
PWM Control signal
X... Electrical interfaces
§ A/B Flow temperature sensors 1 and 2
Outlet temperature sensor (gas condensing
$
combi boiler)
Ionisation electrode
aA
Flue gas temperature sensor
aG
sÖ Internal circulation pump (primary circuit pump)
3-way diverter valve
dÖ
116
B
A
Gas solenoid valve
dG
fÖ Power supply
Ignition unit
gF
Fan motor
a-Ö
A Fan motor control
a-Ö
Water pressure sensor
aND
BCU burner control unit
A
HMU heat management unit (plug
B
HMU heat management unit (plug X4)
C
C
)
aBH