Viessmann VITOCAL 242-S Installation And Service Instructions Manual page 60

Installation sequence
Power supply
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 to the heat pump
control unit. The compressor and instan-
taneous heating water heater (if instal-
led) are "forced" off when power-OFF is
enabled.
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.
X3.7
X3.6
X3.18/X2.1/X1.1
3
≈
3
kWh
3/N
4
Diagram excluding fuses and RCDs
A Heat pump control unit (internal unit,
luster terminals, see chapter "Over-
view of connections: Internal unit")
B Instantaneous heating water heater
(if installed)
C Heat pump compressor (external
unit)
60
(cont.)
kWh
4
Note
Observe the technical connection condi-
tions of the relevant power supply util-
ity.
5 (400 V~)
(230 V~)
7
3
3/N
4
D Heat pump control unit power sup-
ply: See chapter "Heat pump control
unit power supply 230 V~".
E Premium tariff meter
F Backup fuse ripple control receiver
G Ripple control receiver (contact
open: power-OFF enabled) with
backup fuse
3