Electrical Connection; Establishing The Bus Connection And Temperature Sensor (Extra-Low Voltage Side) - Bosch MU 100 EMS Installation Instructions Manual

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 centrally in 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.
20
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24
A
2
T0 T0
0010024454-001
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.
B
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.
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.
When extending the sensor leads, use the following conductor
cross-sections:
• 0.75 to 1.50 mm
2
• 1.50 mm
▶ Route cables through the grommets provided and connect
them as shown in the connection diagrams.
2
conductor cross-section
2
conductor cross-section
2
conductor cross-section for up to 20 m
conductor cross-section for 20 m to 100 m
MU 100 – 6721804146 (2019/10)