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3.3
Installation of a temperature sensor on the
low loss header or downstream of the heat
exchanger
The low loss header temperature sensor T0 should as a priority
be connected to EM100. In the case of wall-mounted boilers
with EMS plus, the sensor on the appliance can be connected
to the MM100 or also to the MC400.
In conjunction with MC400 from software version OF02.05,
one low loss header temperature sensor is sufficient.
Installation on the low-loss header
( Fig. 23 and 25 at the end of the document)
Position of flow temperature sensor (T0):
A
T0
ϑ
1
1
2
ϑ
ϑ
2
4
Fig. 3
Position of flow temperature sensor (T0)
[1] all heat sources
[2] all heating circuits
A
low loss header model 1
B
low loss header model 2
overall flow temperature of all heat sources
1
overall return temperature of all heat sources
2
overall flow temperature of all heating circuits
3
overall return temperature of all heating circuits
4
T0
flow temperature sensor on the low loss header
T0 must be positioned so
sources [1] independently of the flow rate. This is the only way
also to ensure stable operation of the control with small loads.
To ensure optimum control response, the flow should circulate
around the temperature sensor. This can be achieved by a
combination of tee, tap extension and sensor set.
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).
EM100 – 6721804147 (2019/10)
B
ϑ
3
ϑ
1
1
ϑ
2
0 010 013 230-001
is detected on the side of all heat
3
There are two ways to ensure optimised sensor installation
downstream of the heat exchanger ( Item [1] with angled
screw connection and Item [2], 4):
24
1
Fig. 4
Optimised sensor installation
The temperature sensor must be positioned so the
T0
measurement is taken centrally in the pipe.
ϑ
3
▶ 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
2
correctly, the sensor projects 1-2 cm into the heat
exchanger.
ϑ
4
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.
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).
A
B
T0
2
conductor cross-section
2
conductor cross-section
24
A
B
2
T0
0010024454-001
19
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