Connecting The Outdoor Unit - Bosch Compress 3400i AWS Installation Manual

Installation
▶ Observe the colour coding when replacing circuit boards, as circuit
boards with different colours are not interchangeable.
▶ Install a residual current device based on normative requirements in
each country.
As manufacturer, we do not consider it necessary to operate the heat
pump via a residual current device. If a residual current device is
required, either due to the technical connection conditions of the
regional utility company or by the customer, or due to the building
design, a Type B AC/DC sensitive residual current device must be
installed for the heat pump to protect the special electronics (inverter).
5.3.1

Connecting the outdoor unit

WARNING
Risk of fire!
If the connection between indoor and outdoor unit is not correct it can
cause heat-up or fire at the connection.
▶ Use the specified cable, connect and clamp it tightly so the electrical
connection is not susceptible to external forces.
Fig. 20 Cable connections
[A] Communication to indoor unit
[B] Power supply
16
NOTICE
Malfunction due to electrical disturbances!
Power circuit cables (230/400V) cannot be near any CAN-Bus cables
(12V).
▶ Ensure there is a minimum distance of 100mm between power
circuit cables and CAN-BUS cables.
NOTICE
System damage due to swapping of 12V and CAN-BUS connection.
The communication circuits are not designed for 12V direct voltage.
▶ Check that the cables are connected to the corresponding plugs on
the printed circuit board.
To connect the outdoor unit:
1. Prepare the cables for connection.
2. Remove the cover of the indoor and outdoor units and open the
outdoor unit terminals.
3. Remove the cable clamp screw and turn it over.
4. Connect the communication cable between outdoor and indoor units
(fig 20 [A]). The end of the communication cable that connects to the
indoor unit must be shielded.
5. Connect one end of the power supply to the outdoor unit (fig. 20 [B])
and the other end to the mains distribution board.
6. Secure the cables with the cable clamps.
Can Can Can
GND Low High
A
Compress 3400i AWS – 6721825369 (2021/11)
N L
B
0010036992-001