Power Supply With Power-Off: With On-Site Load Disconnect - Viessmann VITOCAL 242-G Installation And Service Instructions Manual

Installation sequence
Power supply
(cont.)
X3.7
X3.6
X3.18/X2.1/X1.1
3
≈
3
kWh
3/N
4
Fig. 29 Diagram excluding fuses and RCD.
Heat pump control unit
A
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

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.
Note
Observe the technical connection conditions of the rel-
evant power supply utility.
32
5 (400 V~)
3
7 (230 V~)
3
kWh
3/N
4
4