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

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■ The assignment of the power-OFF (for compressor
and/or instantaneous heating water heater) is made
via the type of connection and by setting parameters
in the heat pump control unit.
In Germany, the power supply can be cut for a maxi-
mum of 3 x 2 hours per day (24 h).
■ The heat pump control unit/PCB must be supplied
without power-OFF. Tariffs subject to possible shut-
down must not be used here.
■ When using power generated on site (use of power
generated by the PV system to meet own require-
ments):
During the power-OFF period, it is
not possible to
operate the compressor utilising power generated on
site.
■ Protect the power cable to the heat pump control unit
with an MCB/fuse of max. 16 A.
■ For accessories and external components that will
not be connected to the heat pump control unit, pro-
vide the power supply via the same MCB/fuse, or at
least on the same phase, as the heat pump control
unit.
Connection to the same MCB/fuse provides addi-
tional safety when the power is switched off.
Observe the power consumption of the connected
consumers.
■ The PE wire of the power cable must be approx.
10 mm longer than the N and L wires.
Heat pump control unit power supply 230 V~
X3
9
16
16
F1 T6,3AH
18
N L1
8
7
6 N
N
3
1
1
X2 X1
Fig. 38
Note
This supply must never be blocked.
■ Max. fuse rating 16 A
■ Standard tariff (no economy tariff with power-OFF
possible)
■
Recommended power cable: 3 x 1.5 mm 2
(5 x 1.5 mm 2 with power-OFF)
Outdoor unit power supply 230 V~/400 V~
■
Economy tariff and power-OFF can be used.
■
No parameters need to be set when using economy
tariff with power-OFF. The compressor is shut down
during the power-OFF period.
■
During power-OFF, the diagnostic functions for the
external unit are not supported.
Note
Free terminals for internal use.
Installation sequence
Power supply
(cont.)
5776 028 GB
Installation