Connecting Instantaneous Heating Water Heater Power Supply; Power Supply With Power-Off: Without On-Site Load Disconnect - Viessmann VITOCAL 222-S Installation And Service Instructions Manual

Power supply
(cont.)

Connecting instantaneous heating water heater power supply

Internal unit
1/N/PE
230 V/50 Hz
A
L1
L1
L1
N
B
N
N
3/N/PE
400 V/50 Hz
A
L3
L2
L1
B
N N
Fig. 43
Internal unit wiring chamber (see chapter "Over-
A
view of connections":" Internal unit")
Jumpers
B

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.
Recommended power cable:
■
2
400 V~: 5 x 2.5 mm
2
230 V~: 7 x 2.5 mm
■ Fuse rating max. 16 A
Economy tariff and power-OFF can be used
■
Installation sequence
43