Viessmann Vitocrossal Installation Instructions For Contractors page 30

Connecting the control module
Connection diagram for burner control unit
Fig. 26
Burner control unit VUC 310
A
Flame monitor (ionisation current)
B
Vitotronic control unit
C
Servomotor for rotary damper or 2/2-way solenoid
D
valve
Flue gas damper
E
Ignition unit
F
Fuel valve BV1
G
Fan motor with PWM switching and feedback
H
Display and programming unit
K
30
(cont.)
Air pressure switch 1
L
Gas pressure switch GDW1
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
Terminal box
T
Gas pressure switch GDW2
U
Fuel valve BV2
V