Viessmann VITOCAL 222-S Installation And Service Instructions Manual page 65

Power supply
(cont.)
Power supply with power-OFF
Power-OFF without on-site load disconnection
The power-OFF signal is connected
directly to the heat pump control unit.
The compressor is "forced" off when
power-OFF is enabled.
Parameter "Output for instant. heating
water heater at power-OFF 790A"
determines whether and at what stage
the instantaneous heating water heater
stays operational during power-OFF.
X3.7
X3.6
X3.18/X2.1/X1.1
3
≈
3
kWh
3/N
4
Diagram excluding fuses and RCD.
A Heat pump control unit (internal unit,
luster terminals, see chapter "Over-
view of connections: Internal unit")
B Instantaneous heating water heater
C Heat pump compressor (external
unit)
D Heat pump control unit power sup-
ply (see chapter "Heat pump control
unit power supply (230 V~)")
Note
Observe the technical connection condi-
tions of the relevant power supply util-
ity.
5 (400 V~)
7 (230 V~)
3
kWh
3/N
4
4
E High 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
Installation sequence
3
65