External Demand Via 0; External Blocking Via Switching Contact; Input - Viessmann VITOCROSSAL Series Installation Instructions Manual

Connecting external cables
Plug
lH
A
1 L N
?
lH
Floating contact (when connecting, remove jumper
A
between L and 1)
Parameters/codes
"4b:1" in the "General"/1 group
■
Effect of the function on the relevant heating circuit
■
pump:
Parameter/coding address "d7" in the "Heating cir-
cuit" group (only for weather-compensated control
units)
Effect of the function on the circulation pump for cylin-
■
der heating:
Parameter/coding address "5F" in the "DHW"/3
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.
[{{] 0-10V aBJ f-]
+ - S P Ö L
U
+
Fig. 39

External blocking via switching contact

Connection options:
Plug
■ lH
■ EA1 extension (accessory, see separate installation
instructions)
32
(cont.)
10 V input
–
fÖ
A
N N L
EA1 extension
[{A [{S
DE DE
A
Floating contact
A
EA1 extension
B
Parameters/codes
Set "3A" (DE1), "3b" (DE2) or "3C" (DE3) to 2 in the
■
"General"/1 group
Effect of the function on the relevant heating circuit
■
pump:
Parameter/coding address "d7" in the "Heating cir-
cuit" group (only for weather-compensated control
units)
Effect of the function on the circulation pump for cylin-
■
der heating:
Parameter/coding address "5F" in the "DHW"/3
group
0 to 1 V No specification for set boiler water
temperature
1 V Set value 10 °C
10 V Set value 100 °C
When the contact is closed, the burner is switched off.
The heating circuit pump and (if installed) the circula-
tion pump for cylinder heating are switched according
to the set parameter/code (see the following table
"Parameters/codes").
B
[{D
DE