Viessmann Vitocal 222-S Installation And Service Instructions For Contractors page 54

Installation sequence
Power supply
(cont.)
Do not remove jumpers B
400 V/50 Hz power supply.
■ Recommended power cable:
5 x 2.5 mm 2
Max. fuse rating 16 A
■
Economy tariff and power-OFF can be applied
■
Power supply with 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 an instantaneous heating water heater remains
operational during the power-OFF period.
Note
Observe the technical connection conditions of the rel-
evant power supply utility.
Power supply with power-OFF: With on-site load disconnection
The power-OFF signal is connected to the on-site con-
tactor of the economy tariff power supply and to the
heat pump control unit. The compressor and instanta-
neous heating water heater are "forced" off when
power-OFF is enabled.
Note
Observe the technical connection conditions of the rel-
evant power supply utility.
54
in the case of a 3/N/PE
X3.7
A
X3.6
X40
3
D
≈
3
kWh
E G
3/N
F
4
K
Fig. 52 Diagram excluding fuses and RCD
Heat pump control unit (indoor unit, luster termi-
A
nals: See chapter "Indoor unit: Overview of con-
nections")
Instantaneous heating water heater (if installed)
B
Heat pump compressor (outdoor unit)
C
Heat pump control unit power supply: See chapter
D
"Heat pump control unit power supply 230 V~"
Premium tariff meter
E
F Ripple control receiver backup fuse
Ripple control receiver (contact open: Power-OFF
G
enabled); feed: TNC system
Economy tariff meter
H
Feed: TNC system
K
B C
(400 V~)
5
3
7 (230 V~)
3
kWh
3/N
H
4
4