Viessmann Vitotronic 100 Installation And Service Instructions Manual page 68

Function description
External H5 extension
Motorised flue gas damper
EIN EIN
STB N STB TR TR
A
150
1 2 3
F
M
C
B
~
Fig. 41
Plug
A aBÖ
Flue gas damper motor
B
Limit switch
C
If making this connection, remove jumper "TR
ON/TR".
Function check
The burner may only start after the flue gas damper
has opened 90 % of the pipe cross-section and the
limit switch has been activated.
You can check the switch function by measuring its
voltage:
68
(cont.)
–
Flue gas damper closed (switch open)
■
No voltage at terminal "3"
Flue gas damper open (switch closed)
■
Voltage present at terminal "3"
–
–