Viessmann AWT 221.A04, Installation And Service Instructions For Contractors

Page: 48 / 140

48
A
[{S
DE
[{{] 0-10V f-]
A
[{A
DE
[{D
DE
+ - 5 6 3 4 1 2 1 2
E
L1 N
C B D
Fig. 47
A
EA1 extension
B
Connection to controller and sensor PCB
C
Floating N/O contact 1: The agreement of the
power supply utility may be required
D
Floating N/O contact 2: The agreement of the
power supply utility may be required
E
Power supply 1/N/PE 230 V/50 Hz
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
If a casing door is not securely closed this can
lead to damage from condensation, vibrations
and excessive noise.
■
Seal the appliance so it is soundproof and dif-
fusion-proof.
■
On pipe and hose outlets, ensure the thermal
insulation is seated correctly.
Danger
The absence of system component earthing can
lead to serious injury from electrical current and
component damage in the event of an electrical
fault.
Attach earth conductor to front panel and side
panel.
1. Close casing door, in reverse order to page 29.
Note
Because of the sound insulation mat, the casing
door protrudes slightly when closed.
2. Follow steps on page 17 in reverse order.
Fitting the side cover for the outdoor unit
In reverse order to "Opening the outdoor unit wiring
chamber". See page 40.
Installation sequence
Power supply
(cont.)
5776 028 GB
Installation