93
Power supply with power-OFF: Without on-site load disconnect
The power-OFF signal is connected directly into
the 230 V~/400 V~ terminal area of the indoor unit.
With heat pump cascades, the connection is only
made at the lead heat pump.
Electrical connections of the power supply:
■
Indoor unit:
See following chapter:
–
"Terminal area 230 V~/400 V~"
–
"Indoor unit: Heat pump control unit power supply"
–
"Indoor unit: Power supply for instantaneous heat-
ing water heater"
■
Outdoor unit:
See chapter "Outdoor unit: Compressor power sup-
ply".
Note
Observe the technical connection requirements of the
relevant power supply utility.
143.4
143.1
C
B
A
H
D
F
G
3
3
44
3
3/N
3/N
≈
4
K
kWhkWh
5
(400 V~)
7
(230 V~)
40
E
3
(230 V~)
5
(400 V~)
Fig. 69 Diagram excluding fuses and RCD
A
Terminal area 230 V~/400 V~
B
Instantaneous heating water heater
C
Compressor
D
Heat pump control unit power supply
E
Premium tariff meter
F
Ripple control receiver backup fuse
G
Ripple control receiver (contact open: Power-OFF
enabled); feed: TNC system
H
Economy tariff meter
K
Feed: TNC system
Mains power supply in conjunction with self-consumption
Connection schematics for self-consumption via the
integrated energy management system as well as fur-
ther information: See
https://link.viessmann.com/energymanagement.
Fig. 70
Closing the indoor unit
Danger
The absence of system component earthing can
lead to serious injury from electrical current and
component damage in the event of an electrical
fault.
■
Before closing the indoor unit, restore all pro-
tective conductor connections.
■
Check whether equipment and pipe connec-
tions are connected to the equipotential bond-
ing of the building. Restore the connections if
required.
!
Please note
If a casing door is not securely closed this can
lead to damage from condensation, vibrations
and excessive noise.
■
Check all-round seal of front panel for dam-
age.
■
Close appliance correctly.
■
On pipe and hose outlets, ensure the thermal
insulation is seated correctly.
Indoor unit: Fitting the front panel
In reverse order: See page 44.
Electrical connections
Power supply (cont.)
6222080
Installation
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