Viessmann Vitotronic 200 Installation And Service Instructions For Contractors page 29

External functions
(cont.)
External mixer CLOSE/mixer OPEN
!
Please note
Live contacts lead to short circuits or phase fail-
ure.
The external connection must be potential-
free.
External mixer CLOSE/mixer OPEN via switching contacts
Function Mixer CLOSE
Connection Plug
1
143
B
A
B
Contact
Closed Programmed mixers are closed.
■
Open Programmed mixers are in control mode.
■
Parameter With parameter "07" in the "General"
group assign the function to the heating cir-
cuits.
External changeover of multi stage/modulating burners
!
Please note
Live contacts lead to short circuits or phase fail-
ure.
The external connection must be potential-
free.
Function External changeover, stepped / modulating burner
Connection
aVH
1
146
A
.2/ .3
aVD aVD
A
2 3
Floating contact
Plug of the control unit
aVD
.1/ .2
aVH
A
2 3
Floating contact
Electrical connections
Mixer OPEN
Plug .1/ .2
aVD aVD
A
1 2 3
143
B
Floating contact
A
To the control unit
B
Programmed mixers are in control mode.
Programmed mixers are closed.
With parameter "0A" in the "General"
group, assign the function to the heating cir-
cuits.
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