Burner Control Unit Connection Diagram - Viessmann Vitocrossal CRU 800 Service Instructions For Contractors

Connection diagrams

Burner control unit connection diagram

W
V
U
T
S
R
W
P
O
N
M
Fig. 31
Junction box
A
Mains connection to main MCB/fuse 400 V/50 Hz,
B
see the following chapter
Burner control unit VUC 310
C
Flame monitor (ionisation current)
D
E Vitotronic control unit
Servomotor for rotary damper or 2/2-way solenoid
F
valve
Flue gas damper
G
Ignition unit
H
Fuel valve BV1
K
58
A
C
D
Fuel valve BV2
L
Display and programming unit
M
Gas pressure switch GDW2
N
O Air pressure switch 1
Gas pressure switch GDW1
P
Air pressure switch 2
R
Flue gas temperature sensor 2
S
Flue gas temperature sensor 1
T
Boiler water temperature sensor 2
U
Boiler water temperature sensor 1
V
Fan motor with PWM switching and feedback
W
E
F
G
H
K
L
B