Connecting 230 V~ Instantaneous Heating Water Heater Power Supply; Power Supply With Power-Off: Without On-Site Load Disconnect; Power Supply With Power-Off: With On-Site Load Disconnect - Viessmann Vitocal 222-G Installation And Service Instructions Manual

Power supply
(cont.)

Connecting 230 V~ instantaneous heating water heater power supply

230V / 50 Hz
1/N/PE
L1 L1
L1 L1
L1 L1
PE
PE
N N1
N N1
N N1
Fig. 28

Power supply with power-OFF: without on-site load disconnect

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 disconnect

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.
The instantaneous heating water heater cannot be
switched on during the power-OFF period; parameter
"Output for Instant.htg wtr heater at power-OFF
790A" has no effect.
Max. fuse rating 16 A: See "Specification".
■
Economy tariff and power-OFF can be applied
■
■ Recommended power cable:
2
7 x 2.5 mm
Max. cable length: 25 m
X3.7
X3.6
X3.18/X2.1/X1.1
3
≈
3
kWh
3/N
4
Fig. 29 Diagram excluding fuses and RCD
A Heat pump control unit
Instantaneous heating water heater
B
Compressor
C
Heat pump control unit power supply
D
Premium tariff meter
E
Ripple control receiver backup fuse
F
Ripple control receiver (contact open: power-OFF
G
enabled)
Feed: TNC system
Economy tariff meter
H
Feed: TNC system
K
Note
Observe the technical connection conditions of the rel-
evant power supply utility.
Installation sequence
5 (400 V~)
3
7 (230 V~)
3
kWh
3/N
4
4
31