Viessmann MatriX Service Instructions For Contractors page 45

Burner control unit connection diagrams
Fig. 35
Burner control unit VUC 310
A
Flame monitor through ionisation current
B
Vitotronic control unit
C
Servomotor for rotary damper or 2/2-way solenoid
D
valve
Ignition unit
F
Fuel valve BV1
G
Connection and wiring diagram
(cont.)
Fuel valve BV2
H
Plugs high limit safety cut-out
X aBÖ
safety cut-out
TR
Y
Z TR aBÖ
H1 Hours run meter, modulation
H2 Fault message
high limit
aBA
45