Electrical Connection; Establishing The Bus Connection And Temperature Sensor (Extra-Low Voltage Side); Connecting The Power Supply, Pump, Solenoid Valve Or Fault Display - Buderus EM100 Notice D'installation Pour Le Professionnel

3 Installation
Optimised sensor installation downstream of the heat
exchanger
The temperature sensor (T0) must be mounted on the flow
downstream of the heat exchanger on the secondary side
(wet sensor) ( Fig. 24 at end of document).
There are two ways to ensure optimised sensor installation
downstream of the heat exchanger ( Item [1] with angled
screw connection and Item [2], Fig. 4 "Optimised sensor
installation"):
24
A B
1
Fig. 4 Optimised sensor installation
The temperature sensor must be positioned so the
measurement is taken at the centre of the pipe.
▶ Use tap extensions to adjust the installation depth of the low
loss header temperature sensor ( Installation instructions
of low loss header sensor set). If installed correctly, the
sensor projects 1-2 cm into the heat exchanger.
3.4

Electrical connection

▶ Observe electrical regulations and use at least
cable H05 VV-...
3.4.1 Establishing the BUS connection and temperature
sensor (extra-low voltage side)
▶ If the conductor cross-sections vary, use a junction box to
connect the BUS nodes.
▶ Switch BUS nodes [B] via the junction box[A] in star
( Fig. 18 at end of document) or via BUS nodes with 2
BUS connections in series.
If the maximum total length of the BUS connections between all
BUS nodes is exceeded or the BUS system has a ring structure,
commissioning of the system is not possible.
16
24
A
2
T0
0010024454-001
Maximum total length of BUS connections:
• 100 m with 0.50 mm
• 300 m with 1.50 mm
▶ To avoid inductive interference: Make sure all low-voltage
cables are routed separately from supply voltage carrying
cables (min. clearance 100 mm).
▶ In the case of external inductive effects (e.g. from PV systems)
use shielded cable (e.g. LiYCY) and ground one end of the
shield. |Connect the shield to the building's earthing system,
e.g. to a free earth conductor terminal or water pipes, and not
to the connecting terminal for earth leads in the module.
B
When extending the sensor leads, use the following conductor
cross-sections:
T0
• 0.75 to 1.50 mm
• 1.50 mm
▶ Route cables through the grommets provided and connect
them as shown in the connection diagrams.
3.4.2 Connecting the power supply, pump, solenoid valve
or fault display (mains voltage side)
The assignment of the electrical connection depends on which
system is installed. The description at the end of the document
in Fig. 14 to 17 is a possible suggestion for the electrical
connection. Not all steps are shown in black. This makes it
easier to see, which steps belong together.
▶ Only use electric cables of the same quality.
▶ Make sure the power supply is connected to the correct
phases.
A power supply via an earthed safety plug is not permissible.
▶ Connect only components and assemblies to the outputs as
described in these instructions. Do not connect any
additional controls that operate other system components.
▶ Route cables through the grommets, connect them as
shown in the connection diagrams and secure them with
the strain relief devices included in the scope of delivery
( Fig. 14 to 17 at the end of this document).
The maximum power consumption of the connected
components and assemblies must not exceed the power output
stated in the specifications for the module.
▶ If the mains voltage is not supplied via the electronic system
of the heat source: Install a standard all-pole isolator
(in accordance with EN 60335-1) on site to interrupt the
mains voltage.
EM100 – 6720891034 (2019/04)
2
conductor cross-section
2
conductor cross-section
2
conductor cross-section for up to 20 m
2
conductor cross-section for 20 m to 100 m