Closing The Heat Pump - Viessmann Vitocal 300-A Installation And Service Instructions Manual

Installation sequence
Power supply
(cont.)
[{A [{S
DE DE
1 2 1 2 3 4
B C
Fig. 40
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.

Closing the heat pump

!
Please note
Leaking hydraulic connections lead to appliance
damage.
Check the internal and on-site hydraulic con-
■
nections for leaks.
■ In the event of leaks, switch OFF the appli-
ance immediately. Drain off liquid via the drain
valve. Check the seating of seal rings. Always
replace displaced seal rings.
46
A
[{D [{{] 0-10V
DE
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