External Demand Via 0 - 10 V Input; External Blocking Via Switching Contact - Viessmann Vitodens 242-F Installation And Service Instructions Manual

Installation sequence
Electrical connections
Plug
lH
A
1 L N
?
lH
Floating contact (when connected, remove jumper
A
between L and 1)
Codes
"4b:1" in group "General"/1
■
Effect of the function on the relevant heating circuit
■
pump:
Coding address "d7" in group "Heating circuit" (only
for weather-compensated control units)
Effect of the function on the circulation pump for cylin-
■
der heating:
Coding address "5F" in group "DHW"/3
External demand via 0
Connection at 0 10 V input to EA1 extension.
–
!
Please note
Ensure DC separation between the earth con-
ductor and the negative pole of the on-site volt-
age source.
[{{] 0-10V aBJ f-]
+ - S P Ö L
U
+
Fig. 22

External blocking via switching contact

Connection options:
Plug
■ lH
EA1 extension (accessory, see separate installation
■
instructions)
30
(cont.)
10 V input
–
fÖ
A
N N L
EA1 extension
[{A [{S
DE DE
A
Floating contact
A
EA1 extension
B
Codes
Set "3A" (DE1), "3b" (DE2) or "3C" (DE3) to 2 in
■
group "General"/1
Effect of the function on the relevant heating circuit
■
pump:
Coding address "d7" in group "Heating circuit" (only
for weather-compensated control units)
Effect of the function on the circulation pump for cylin-
■
der heating:
Coding address "5F" in group "DHW"/3
≙
0 1 V No default 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 code (see the following table "Codes").
B
[{D
DE