Viessmann BWT 241.A Series, Installation And Service Instructions Manual

Page: 47 / 124

47
Note
Observe the technical connection condi-
tions of the relevant power supply util-
ity.
X3.7
X3.6
3
3
4 4
3
3/N 3/N
≈
4
kWh kWh
5
3
(400 V~)
7 (230 V~)
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)
Feed: TNC system
H Economy tariff meter
K Feed: TNC system
Power-OFF with on-site load disconnection
The power-OFF signal is connected to
the on-site contactor of the economy tar-
iff power supply and in the heat pump
control unit. The compressor
and instan-
taneous heating water heater are
"forced" off when power-OFF is ena-
bled.
The instantaneous heating water heater
cannot be switched on during the power-
OFF period; parameter
"Output for
instant. heating water heater at
power-OFF 790A"
has no effect.
Installation sequence
Connecting power cables
(cont.)
5601 598 GB
Installation