Viessmann BWT 221.A06, Installation And Service Instructions Manual

Page: 47 / 124

47
Note
Observe the technical connection condi-
tions of the relevant power supply util-
ity.
≈
3
3
4
4
3
3/N 3/N
4
kWh
kWh
3
7
5 (400 V~)
(230 V~)
X3.7
X3.6
X3.18/X2.1/X1.1
Diagram excluding fuses and RCD
A Heat pump control unit
B Instantaneous heating water heater
C Compressor
D Heat pump control unit power sup-
ply
E Standard tariff meter
F Backup fuse ripple control receiver
G Ripple control receiver (contact
open: power-OFF enabled) with
backup fuse
H Economy tariff meter
K
Feed: TNC system
L Mains isolator
Phase monitor (if installed)
The phase monitor is used to monitor the
mains power supply to the compressor.
The phase monitor switches off (switch-
ing contact opens) if the internal toleran-
ces are exceeded. The phase monitor automatically re-ena-
bles the power supply if the values return
to within the specified tolerance range.
Remove the cause if the relay has
responded. The relay does not need to
be reset.
Installation sequence
Connecting power cables
(cont.)
5601 574 GB
Installation