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▶ 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. 22.
Fig. 22 EMS connection
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
Flow temperature sensor T0
The sensor is included in the scope of delivery.
▶ Install the sensor at the buffer cylinder according to the installation
manual for the cylinder.
▶ Connect the flow temperature sensor to terminal T0 in the electric
box of the indoor unit.
6.7
DHW cylinder temperature sensor TW1/TW2
When a DHW cylinder is installed, a temperature sensor TW1 must be
connected to the system. For some cylinders an additional TW2 sensor
is also needed.
▶ Connect the hot water temperature sensor TW1/TW2 to terminal
TW1/TW2 on the XCU-THH (XCU HY) module in the indoor unit.
6.8
Outdoor temperature sensor T1
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.
Compress 5800i AW – 6721862724 (2023/06)
2
.
0010040325-001
Fig. 23 Position of the outdoor temperature sensor
6.9
External inputs
NOTICE
Damage due to incorrect connection!
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.
The external inputs are connected either to a circuit breaker for manual
activation or a control device with a potential free relay output.
6.10
Establishing the power supply connection
6.10.1 Main supply
Observe local rules and regulations when choosing the correct cross-
section of the cables and cable types, however the cross-section
specified here must be adhered to.
Electrical connection
N
NW
NE
W
E
SW
SE
S
6 720 809 156-23.1I
19
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