Viessmann VITOCAL 222-S Installation And Service Instructions Manual page 45

Power supply
(cont.)
X3.7
X3.6
X3.18/X2.1/X1.1
3
≈
3
kWh
3/N
4
Fig. 45 Diagram excluding fuses and RCDs
Heat pump control unit (internal unit, luster termi-
A
nals, see chapter "Internal unit: Overview of con-
nections")
Instantaneous heating water heater (if installed)
B
Heat pump compressor (external unit)
C
Heat pump control unit power supply: See chapter
D
"Heat pump control unit power supply 230 V~".
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: TN-C system
K
Mains isolator
L
5 (400 V~)
(230 V~)
7
3
kWh
3/N
4
4
3
Installation sequence
45