Connecting An External Default Output: 0 - 10 V In - Viessmann EM-EA1 extension Installation And Service Instructions Manual

Connecting external functions
+ - + -
1 2 1 2
U
+
Fig. 3
Enable signal
A
Junction box
B
When making the connection, ensure correct polarity
of the DC control voltage 0 - 10 V.
Note
No galvanic separation is required between the earth
conductor and the negative pole of the on-site power
source.

Connecting an external default output: 0 - 10 V IN

Analogue input for connecting the external default set
flow temperature or the external default output
+ - + -
1 2 1 2
U
+
Fig. 4
Enable signal
A
B Junction box
When making the connection, ensure correct polarity
of the DC control voltage 0 - 10 V.
Note
No galvanic separation is required between the earth
conductor and the negative pole of the on-site power
source.
(cont.)
hH [{]
fD
1
? ?
A
hH
[{]
fD
1
? ?
A
fÖ
?
B
The 0 to 10 V hook-up generates the following set flow
temperatures:
< 1 V No default set flow temperature
≙
1 V 10 °C
≙
10 V 100 °C or max. set flow temperature in
accordance with factory-set limit for heat gener-
ator
If 230 V voltage is present at digital input 43-1, the
external default set flow temperature is enabled.
fÖ
?
B
The 0 to 10 V hook-up generates the following default
output for the heat generator:
≙
< 1 V 0 %
≙
1 V 10 % or lower modulation limit
≙
10 V 100 %
If 230 V voltage is present at digital input 43-1, the
external default output is enabled.
Installation sequence
9