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5.4.3
Heating circuit pump (PC1)
Depending on the configuration of the heating system, a pump is needed
that is selected depending on the flow rate and pressure drop
requirements.
The pump PC1 must always be connected to the installation module of
the indoor unit according to the wiring diagram.
Maximum load at the relay output of the pump PC1: 2A, cos> 0.4. If
the load is higher, install an intermediate relay.
5.4.4
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.
EMS-BUS and CAN-BUS are not compatible.
▶ Do not connect EMS-BUS units to CAN-BUS units.
It must be possible to safely interrupt the power supply to the device.
▶ Install a separate safety switch that completely de-energizes the
indoor unit. 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.
▶ Mount the enclosed terminals on the installation PCB.
▶ Connect the unit according to the wiring diagram. No additional
consumers may be connected.
▶ When changing the PCB, note the colour coding.
When extending temperature sensor cables, use the following conductor
diameters:
• up to 20 m long cable: 0.75 to 1.50 mm
• up to 30 m long cable: 1.0 to 1.50 mm
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.
AWE – 6721835317 (2021/09)
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2
Accessories such as output limiters to be connected to the CAN-BUS are
connected in parallel on the installation module card in the indoor unit to
the CAN-BUS connection for the heat pump. Accessories can also be
connected in series with other units connected to the CAN-BUS.
The heat pump and indoor unit are connected to each other by a
communication line, the CAN-BUS.
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
module.
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.
Fig. 8
Termination CAN-BUS
On
CAN-BUS completed
Off
CAN-BUS not completed
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.
Flow temperature sensor T0
Sensor is included in the delivery.
▶ Install the sensor 1-2 metres behind the diverter valve or at the buffer
cylinder or at the low loss header if present.
▶ Connect the flow temperature sensor on the installation module in
the control device of the indoor unit to terminal T0.
Outdoor temperature sensor T1
A screened cable must be used if the outdoor temperature sensor cable
is longer than 15 m. The screened cable must be earthed to the indoor
unit. The max. length of a screened cable is 50 m.
The cable to the outdoor temperature sensor must meet the following
minimum requirements:
2
• Cable diameter: 0.5 mm
• Resistance: max. 50 /km
• Number conductors: 2
Installation
2
6 720 809 156-24.1I
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