Unit installation
Table Of Contents
![](/manual/viessmann/vitocrossal-200-cm2-series/unit-installation-english/images/img-49.png)
49
A
Burner control unit MPA 51
B
Vitotronic control unit
C
Fan motor with PWM control and
feedback
D
Flame monitoring via an ionisation
current
E
Display unit with reset function
F
Air pressure switch
G
Minimum pressure, gas pressure
switch
H
Ignition unit
K
Gas fuel safety valve
L
Choke valve (for 87, 142 and
186 kW)
M
Servomotor for rotary valve damper
(for 246 and 311 kW)
Burner control unit connection diagram
Burner control unit connection diagram
5692 907 GB