External Demand Via 0 - 10 V Input; External Blocking Via Switching Contact - Viessmann Vitodens 222-F Installation And Service Instructions For Contractors

Electrical connections
Plug
lH
A
1 L N
?
lH
Floating contact (when connected, remove jumper
A
between L and 1)
Parameter settings
"4b:1" in the "General" group
■
Effect of the function on the relevant heating circuit
■
pump:
Parameter "d7" in the "Heating circuit" group
Effect of the function on the circulation pump for cylin-
■
der heating (if installed):
Parameter "5F" in the "DHW" group
External demand via 0
Connection at 0 10 V input at EA1 extension.
–
Ensure DC separation between the earth conductor
and the negative pole of the on-site power source.
[{{] aBJ f-]
0-10V
A
+ - S P Ö L
U
+
Fig. 14

External blocking via switching contact

Connection options:
■ Plug lH
■ EA1 extension (accessory, see separate installation
instructions)
When the contact is closed, the burner is switched off.
The heating circuit pump and (if installed) circulation
pump for cylinder heating are switched according to
the following parameter settings.
(cont.)
10 V input
–
fÖ
N N L
EA1 extension
[{A [{S
DE DE
A
Floating contact
A
EA1 extension
B
Parameter settings
Set "3A" (DE1), "3b" (DE2) or "3C" (DE3) in the
■
"General" group to 2
Effect of the function on the relevant heating circuit
■
pump:
Parameter "d7" in the "Heating circuit" group
Effect of the function on the circulation pump for cylin-
■
der heating (if installed):
Parameter "5F" in the "DHW" group
0 to 1 V No specification for 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 potential-free
and meet the requirements of protection class II.
Installing the boiler
B
[{D
DE
21