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Electrical connection
The connection is made with four wires, as the 24VDC supply is also
connected. The 24VDC and CAN-BUS connections are marked on the
module.
The CANBUS cable has two pairs of twisted wires. Vcc and GND is one
pair, H and L is the second pair. Maximum cable insulation striping length
for all cables is 120mm. Maximum wire striping is between 8-10mm.
≤120 mm
≤10 mm
Fig. 27 Wire striping CAN-BUS
6.4
EMS-BUS for accessories
EMS-BUS and CAN-BUS are not compatible.
▶ Do not connect EMS-BUS units to CAN-BUS units.
The following applies to accessories that are connected to the EMS-BUS
[15VDC, class III (SELV)] (see also the installation instructions for the
respective accessories):
▶ If several BUS units are installed, there must be a minimum spacing of
100 mm between them.
▶ If several BUS units are installed, connect them in series or in a star
configuration.
▶ Use cable with a conductor cross section of at least 0.5 mm
▶ In case of external inductive interferences (e.g. from PV systems),
use screened cables.
▶ Connect the cable to the EMS-BUS terminal at the indoor unit.
If there is already a connection on the EMS terminal, the connection is
made parallel to the same terminal in accordance with Fig. 28.
Fig. 28 EMS connection
6.5
Installation of the temperature sensor
The user interface in the delivery configuration automatically regulates
the flow temperature based on the outdoor temperature. A room
temperature-dependent controller can be installed for greater comfort.
6.6
Flow temperature sensor T0
The sensor is already installed in the indoor unit.
22
6.7
The cable to the outdoor temperature sensor must meet the following
minimum requirements:
• Number conductors: 2
• Maximum length 30 m
▶ Install the sensor on the coldest side of the house, normally facing
north. The sensor must be protected against direct sunlight, air vents
or other factors which could affect the temperature measurement.
The sensor must not be installed directly under the roof.
▶ Connect the outdoor temperature sensor T1 to the terminal T1 on the
XCU-THH (XCU HY) module within the electric box of the indoor unit.
0010041915-001
2
.
Fig. 29 Position of the outdoor temperature sensor
6.8
NOTICE
Damage due to incorrect connection!
0010040325-001
Connections intended for a different voltage or current can damage
electrical components.
▶ Only perform connections to the heat pump's external inputs which
are designed for 3,3V and 1 mA.
▶ If an intermediate relay is required, use only relays with gold-plated
terminals.
The external inputs can be used for the remote control of certain
functions in the user interface.
Those functions which are activated by the external inputs are described
in the operating manual for the user interface.
Outdoor temperature sensor T1
External inputs
Compress 5800i AW – 6721858460 (2023/06)
N
NE
NW
W
E
SE
SW
S
6 720 809 156-23.1I
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