Viessmann VITOCAL 242-G Installation And Service Instructions Manual page 33

Power supply
(cont.)
X3.7
X3.6
X3.18/X2.1/X1.1
3
≈
3
kWh
3/N
4
Fig. 30 Diagram excluding fuses and RCDs
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) with backup fuse
Economy tariff meter
H
Feed: TNC system
K
Mains isolator
L
5 (400 V~)
(230 V~)
7
3
kWh
3/N
4
4
3
Installation sequence
33