Electrical installation
44
Installation instructions geoTHERM 0020051574_04
7
7 Electrical
installation
e
Danger!
Risk of electric shock!
>
Always switch off the power supply to all
circuits before carrying out any electrical
installation work.
>
Check that there is no voltage.
>
Make sure that the power supply is
secured against being inadvertently
switched on again.
b
Caution!
Risk of damage caused by improper elec-
trical installation.
The electrical installation must only be car-
ried out by an approved qualified electri-
cian.
>
Carry out the described installation work
correctly.
b
Caution!
Risk of damage caused by an inadequate
separator.
You must be able to switch off the electrical
connection using an on-site, three-pole,
adjustable separator with a contact opening
of at least 3 mm (e. g. circuit breaker). The
separator must provide coupled fuses so
that all other fuses also switch off if one
fuse drops.
>
Ensure that a corresponding separator is
available on site.
b
Caution!
Risk of short circuits!
If lines longer than 30 mm are stripped,
short circuits may occur on the PCB if the
lines are correctly secured in the plug.
>
Strip the 230 V lines in order to connect
to the ProE plug. For safety reasons, do
not strip the lines to any more than
30 mm and ensure that they are secure
in the plug.
b
Caution!
Risk of malfunction due to improper run-
ning of lines.
The lines for the external sensor, eBUS and
room thermostat carry low voltages. Envi-
ronmental interferences may affect the
sensor lines and send incorrect information
to the heat pump controller.
>
Lay low-voltage lines, such as sensor
lines, on-site in the building so that they
are a suitable distance from the power
lines. If low-voltage lines and mains volt-
age lines are laid in parallel, a minimum
clearance of 25 cm applies for a length
of 10 m.
7.1
Observing the installation instructions
>
Use the values for the maximum rated power that are
specified in the technical data to determine the required
line cross sections .
>
In each case, take into consideration the on-site installa-
tion conditions.
>
Install the heat pump using a secure mains connection.
>
Install the separator right next to the heat pump.
>
For the electricity supply, connect the heat pump to a
three-phase 400 V power system with a
neutral line and
an earth line
.
>
Fuse this connection using the exact values that are
specified in the technical data (
¬
Tab. 14.1
or
¬
Tab. 14.2
).
>
Connect an external, heating circuit pump (to be fitted
on-site) with I
max
= 2 A and U
max
= 230 V. If these values
are exceeded, install a relay/circuit breaker that is to be
fitted on-site and switch the pump using this.
>
If the local power company requires that the heat pump
is controlled using a blocking signal, fit a corresponding
contact switch as prescribed by the power company
(
¬
Ch. 7.3.2
).
>
Ensure that the sensor lines, e. g. VRC DCF receiver, do
not exceed the maximum line length of 50 m.
>
Guide supply lines with mains voltage separately from
sensor or bus lines from a length of 10 m. If this is not
possible, use shielded lines. Lay the shielding on one side
of the sheet for the heat pump’s switchbox.
>
Do not use free terminals on the heat pump as base ter-
minals for further wiring.
i
You can find an overview of the complete elec-
trical circuit diagram in (
¬
Ch. 17
).
