Viessmann Vitocal 300-G Series Installation And Service Instructions Manual page 41

Power supply
(cont.)
Connection to EA1 extension
Condition: "Enable Smart Grid 7E80" must be at "1".
[{A [{S
DE DE
1 2 1 2 3 4
B C
Fig. 29
EA1 extension
A
Connection to controller and sensor PCB
B
Floating N/O contact 1: The agreement of the
C
power supply utility may be required
Note
■ If Smart Grid is enabled ("Enable Smart Grid 7E80"
set to "1"), both inputs DE2 and DE3 cannot be
used for signals "External demand" or "External
blocking".
■ The power-OFF function is integral to Smart Grid.
Therefore do not connect the power-OFF signal to
terminals X3.6 and X3.7. Do not remove jumper.
Connection to heat pump control unit
Condition: "Enable Smart Grid 7E80" must be at "4".
X3.1 X3.1
B
C D
A
Fig. 30
Main PCB
A
Connection X3.1 (L') on the luster terminals
B
Floating contact 1: The agreement of the power
C
supply utility may be required
Floating contact 2: The agreement of the power
D
supply utility may be required
A
[{D [{{]
DE 0-10V
5 6 + -
D
f-]
A
N L1
E
Floating N/O contact 2: The agreement of the
D
power supply utility may be required
Power supply 1/N/PE 230 V/50 Hz
E
Note
■ If Smart Grid is connected to the two digital inputs on
main PCB ("Enable Smart Grid 7E80" set to "4"),
the external hook-up for the heating/cooling circuits
must not be switched on ("Remote control 2003"
set to "2"). Otherwise the Smart Grid will not be
active.
■ The power-OFF function is integral to Smart Grid. In
this case, therefore, the power-OFF signal must not
be connected to connections X3.6 and X3.7.
Installation sequence
41