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N N
L
L
Fig. 30 Connecting the mains power supply and booster heater control
cable
[1]
Rotary selector
[2]
Mains power supply terminal
[3]
Strain relief
[4]
External booster heater control cable terminal (volt free)
[5]
Strain relief
6.4
CAN-BUS
NOTICE
The system will be damaged if the 12 V- and the CAN-BUS
connections are incorrectly connected!
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 modules.
Accessories such as power guards which are to be connected to the CAN
BUS, are connected to the installation module of the indoor unit parallel
to the CAN BUS connection for the outdoor unit. They can also be
connected in series with other CAN-BUS connected units.
The indoor and outdoor units are connected by a communication line
CAN BUS, the CAN-BUS.
A LIYCY cable (TP) 2 x 2 x 1.5 mm
an extension cable outside the appliance. Alternatively, twisted pair
cables approved for outdoor use with a minimum cross-section of
2
0.75 mm
can be used. In doing so, only earth the shielding on one side
(indoor unit) and to the casing.
Compress Hybrid 3400i AW – 6721861825 (2023/08)
1
2
0010031534-003
2
(or equivalent) is a suitable for use as
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
modules.
The "Term" changeover switch identifies the start and end of CAN-BUS
loops. Ensure that the correct modules are terminated and that all other
modules are not terminated.
3
Fig. 31 Terminate CAN-BUS
On
CAN-BUS completed
4
Off
CAN-BUS not completed
5
6.5
Installation of the temperature sensor
In the default setting, the controller automatically regulates the flow
temperature depending on the outside temperature. A room
temperature-dependent controller can be installed for greater comfort.
6.6
Connecting the outside temperature sensor
If the length of the temperature sensor cable outdoors is more than
15 m, use a screened cable. The screened cable must be earthed in the
indoor unit (functional earth). The maximum length of screened cable is
50 m.
A temperature sensor cable that runs outdoors must satisfy the following
requirements:
• Cable diameter: 0.5 mm
• Resistance: max. 50 ohm / km
• Number of conductors: 2
• Maximum length: 50 m
▶ Connect outside temperature sensor to terminal T1 ( Chapter
12.4).
Electrical connection
6 720 809 156-24.1I
2
21
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