External Demand Via 0; External Blocking Via Switching Contact; Input - Viessmann VITODENS 200-W Installation And Service Instructions Manual

Electrical connections

External demand via 0

Connection at 0 10 V input to extension EA1.
–
Ensure DC separation between the earth conductor
and the negative pole of the on-site voltage source.
[{{] aBJ
0-10V
+ -
S P Ö L ? N
0-10 V
U
+
Fig.12

External blocking via switching contact

Connection options:
Plug .
■ lH
Extension EA1 (accessory, see separate installation
■
instructions).
Plug
lH
A
1 L N
?
lH
Floating contact
A
When making this connection, remove jumper
between 1 and L.
The burner is switched off if this contact is closed. The heating circuit pump and circulation pump for cylinder
heating are switched according to the set code (see the following table "Codes").
!
Please note
When blocked, there is no frost protection for
the
heating system.
(cont.)
10 V input
–
f-] fÖ
A
N L
?
230 V~
≙
0 1 V No default set boiler water temperature
–
≙
1 V Set value 10 °C
≙
10 V Set value 100 °C
!
Please note
'Live' contacts lead to short circuits or phase fail-
ure.
The external connection must be floating.
Extension EA1
B
[{A [{S [{D
DE DE DE
A
Floating contact
A
Extension EA1
B
Installation sequence
19