INSTaLLaTION
Preparations
24
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9.4 Electrical installation
DANGER Electrocution
Carry out all electrical connection and installation work
in accordance with national and regional regulations.
DANGER Electrocution
Only use a permanent connection to the power supply.
It must be possible to separate the appliance from the
power supply by an isolator that disconnects all poles
with at least 3 mm contact separation. This requirement
can be met with contactors, circuit breakers, fuses, etc.
Note
The specified voltage must match the mains voltage. Ob-
serve the type plate.
Install cables with the following cross-sections in accordance with
the respective fuse rating:
fuse protec-
tion
assignment
Cable cross-section
3 x C 16 A
Compressor (in-
verter)
(3-phase)
4.0 mm²
2.5 mm² when routing a multi core
cable on a wall or in an electrical con-
duit on a wall
C 20 A
Compressor (in-
verter)
(single phase)
4.0 mm²
2.5 mm² when routing a multi core
cable on a wall or in an electrical con-
duit on a wall
3 x B 16 A
Electric emergency/
booster heater
(DHC)
(3-phase)
2.5 mm
1.5 mm² with only two live cores and
routing on a wall or in an electrical con-
duit on a wall.
2 x B 16 A
Electric emergency/
booster heater
(DHC)
(single phase)
2.5 mm² for routing through a wall
1.5 mm² when routing multi-core cables
on a wall or in an electrical conduit on
a wall
B 16 A
Control
1.5 mm²
The external unit fan is powered by the internal unit and is pro-
tected by a 10 A fuse in the internal unit.
f
f
Install the following cables between the internal and external
units:
assignment
Cable cross-section
Electr. mains
3 x 1.0 mm² screened, no rigid wire
Fan
3 x 1.0 mm² screened, no rigid wire
BUS
j-y(St)2x2x0.5
Also, observe the figure in chapter “Connection diagram”.
The electrical data is provided in the chapter “Specification / Data
table”.
D
00000
52
46
3
f
f
Route the three connection cables of the external unit th-
rough the ring core twice, as shown in the diagram.
!
Material damage
Provide separate fuses/MCBs for the three power circuits
of the compressor, the control unit and the electric emer-
gency/booster heater.
Note
The appliance includes an inverter for the variable speed
compressor. In the event of a fault, inverters can cause
DC residual currents. If RCDs are provided, they have to
be type B AC/DC-sensitive.
A DC residual current can block type A RCDs.
f
f
Ensure that the appliance power supply is dis-
connected from the distribution board.
9.5 Buffer cylinder
A buffer cylinder is recommended to ensure trouble-free appliance
operation.
The buffer cylinder provides hydraulic separation of the volume
flows in the heat pump circuit and heating circuit, and also serves
as an energy source for defrosting.
f
f
When operating without a buffer cylinder, observe the de-
tails specified in chapter „Minimum flow rate with individual
room control by means of FEK / FE7 in systems without buf-
fer cylinder“.