External Blocking Via Switching Contact - Viessmann Vitodens 222-F B2TA Installation And Service Instructions Manual

Installing the boiler
Electrical connections
[{{] aBJ
0-10V
+ -
S P
U
+

External blocking via switching contact

Connection options:
■ Plug lH.
■ Extension EA1 (accessory, see sepa-
rate installation instructions).
The burner is switched off if this contact
is closed. The heating circuit pump and
(if installed) the circulation pump for cyl-
inder heating are switched according to
the set code (see following table
"Codes").
24
(cont.)
f-] fÖ
A
Ö L ? N
N
?
230 V~
­
0-10 V
0 – 1 V ≙ No default set boiler water
temperature
≙ Set value 10 °C
1 V
≙ Set value 100 °C
10 V
L
!
Please note
'Live' contacts lead to short cir-
cuits or phase failure.
The external connection must be
potential-free and comply with
the requirements of safety cate-
gory II.