Viessmann Vitocrossal 200 Series Service Instructions Manual page 52

Connection diagrams
Burner control unit connection diagram
Fig. 42
A Burner control unit VUC 310
Flame monitor (ionisation current)
B
Vitotronic control unit
C
2/2-way solenoid valve
D
Flue gas damper
E
Ignition unit
F
Fuel valve BV1
G
Fan motor with PWM control and feedback
H
52
K Display and programming unit
Air pressure switch 1
L
Gas pressure switch
M
Air pressure switch 2
N
Flue gas temperature sensor 1
O
Flue gas temperature sensor 2
P
Boiler water temperature sensor 1
R
Boiler water temperature sensor 2
S