Electrical Connection - Bosch Compress 7000i AW Installation Manual

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Fig. 17 Connections of heat carrying medium pipes, valid for all sizes
[1] Heat transfer medium outlet (to the indoor unit) DN25
[2] Heat transfer medium inlet (from the indoor unit) DN25
5.5.4

Electrical connection

NOTICE
Malfunction due to faults!
High-voltage lines (230/400 V) in the vicinity of communication lines
can cause the heat pump to malfunction.
▶ Route sensor cable, EMS-BUS cable and shielded CAN-BUS cable
separately to power cables. Maintain a minimum distance of
100 mm. The BUS cable can be routed together with sensor cables.
It must be possible to safely interrupt the power supply to the device.
▶ If power is not supplied to the heat pump via the indoor unit, install a
separate safety switch that completely de-energizes it. When the
power supply is separate, a separate safety switch is needed for each
supply line.
▶ Select the appropriate conductor cross-sections and cable types for
the respective fuse protection and routing method.
▶ Connect the heat pump according to the wiring diagram. No
additional consumers may be connected.
▶ Ensure to install residual current device based on normative
requirements in each country. We recommend to use residual current
device type B.
▶ When changing the PCB, note the colour coding.
CAN-BUS
NOTICE
The system will be damaged if the 12 V- and the CAN-BUS
connections are confused!
The communication circuits are not designed for 12 V constant voltage.
▶ Check to ensure that the cables are connected to the contacts with
the corresponding markings on the circuit board.
The heat pump and indoor unit are connected to each other by a
communication line, the CAN-BUS.
Compress 7000i AW – 6721830633 (2021/02)
A LIYCY cable (TP) 2 x 2 x 0.75 (or equivalent) is suitable as an
extension cable outside of the unit. Alternatively, twisted pair cables
approved for outdoor use with a minimum cross-section of 0.75 mm
can be used. In doing so, only earth the shielding on one side (indoor
unit) and to the casing.
The maximum permissible cable length is 30 m.
The connection is made with four wires, as the 12 V supply is also
connected. The 12 V and CAN-BUS connections are marked on the PCB.
The "Term" changeover switch identifies the start and end of CAN-BUS
loops. The I/O module board in the heat pump must be terminated.
Fig. 18 Termination CAN-BUS
Connecting the heat pump
A CAN-BUS signal cable with the minimum dimensions 4 x 0.75 mm
and a maximum length of 30 m must be routed between the heat pump
and indoor unit.
▶ Release belt (Velcro fastener).
▶ Remove the lock of the control device.
▶ Feed the connecting lead through the cable conduits. Use tension
springs if required.
▶ Connect cable as shown in the wiring diagram.
▶ Tighten all cable fixings if required.
▶ Reattach the cover of the control device.
▶ Reattach the belt.
Installation
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