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3.2
Installation of temperature sensor on the low loss
header
A
T0
ϑ
ϑ
1
1
2
ϑ
ϑ
2
4
Fig. 4
Temperature sensor flow position (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 to all heat sources
2
Overall flow temperature to all heating circuits
3
Overall return temperature of all heating circuits
4
T
Temperature sensor flow on the low loss header
0
should be positioned so
T
is detected on the side of all heat sources
0
3
[1] independently of the flow. Only in this way can the control also work
with small heat loads and lower flow rates. Please follow the same logic
and advice when using a secondary plate heat exchanger as a hydraulic
separation solution.
3.3
Electrical connection
▶ Observe current regulations applicable to power connections, and
use at least cable type H05 VV-...
3.3.1
Connecting the BUS connection and temperature sensor
(extra-low voltage side)
General BUS connection
If the maximum cable length of the BUS connection between
all BUS nodes is exceeded, or if the BUS system is realised
as a ring structure, the system cannot be commissioned.
Maximum total length of BUS connections:
2
• 100 m at 0.50 mm
conductor cross-section
2
• 300 m at 1.50 mm
conductor cross-section
BUS connection between the heat source – and cascade module
▶ Connect the heat sources and lower-level cascade modules directly
to terminals BUS1 ...BUS4 ( overview of the terminal
assignment).
BUS connection between the cascade module – user interface –
other modules
▶ If the conductor cross-sections are different, use the junction box to
connect the BUS nodes.
▶ BUS user [B] via junction box [A] in a star ( fig. 20, page 88, note
the instructions for the user interface and other modules).
Temperature sensor
When sensor leads are extended, apply the following lead cross-
sections:
2
• Up to 20 m with 0.75 mm
to 1.50 mm
• 20 m up to 100 m with 1.50 mm
MC 400
B
T0
3
ϑ
1
1
ϑ
ϑ
2
6 720 809 449-24.1O
2
conductor cross-section
2
conductor cross-section
General information on the low voltage side
Terminal designations (extra-low voltage side 24 V)
0-10 V
Connection
or building management system with a 0-10 V controller output, or
in addition for output feedback as a 0-10 V signal to terminal 3 for
ϑ
a building management system
3
2)
BUS
Connection to controller, modules
BUS1...4
Connection to heat sources or lower-level cascade modules
I2, I3
Connection to external switch (Input)
2
OC1
Connection
(Cascade Output)
T0, T1, T2 Temperature sensor connection (Temperature sensor)
Table 4
4
1) Terminal assignment: 1 – earth; 2 – 0-10 V input for heat requirement from the
building management system; 3 – 0-10 V output (optional) for feedback
2) In a few devices, the terminal for the BUS system is labelled with EMS.
3) Terminal assignment: 1 - earth; 2 - output; 3 - input (optional)
▶ If PO is used to control, do not bridge IA1. When IA1 is bridged and
PO is open, the maximum set flow temperature is controlled.
▶ All low voltage leads must be routed separately from cables carrying
mains voltage to avoid inductive interference (minimum separation
100 mm).
▶ In the case of external inductive interferences (e.g. from PV
systems), use shielded cables (e.g. LIYCY) and earth the shield on
one side. The shield should be connected to the building's earth lead,
e.g. to a free earth conductor terminal or water pipe, and not to the
terminal for the earth lead in the module.
▶ Route cables through the grommets provided and connect them as
shown in the connection diagrams.
3.3.2
Connecting the power supply, pump and mixer
(mains voltage side)
Terminal designations (mains voltage side)
120/230 V AC
PC0, PC1
A0
IA1
Table 5
The electrical connections made depend on the hydraulic
design and system installed. Figures 13 to 20, from
page 87 onwards, reflect possible electrical connections
and are not to be taken as recommended systems.
▶ Only use electrical cables of the same quality.
▶ Ensure that the power supply is connected to the correct phases.
A power supply via an earthed safety plug is not permitted.
▶ Only connect components and assemblies to the outputs in
accordance with these instructions. Do not connect any additional
controls, which control other system components.
The maximum power consumption of the connected
components and assemblies must not exceed the output
stated in the module specifications.
▶ 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.
1)
for 0-10 V room temperature-dependent controller
3)
Pump speed control with 0-10 V signal
Mains voltage connection
Pump connection (Cascade Pump)
Connection for fault display (Alert)
230 V ON/OFF controller connection)
6 720 819 669 (2016/05)
Mounting | 15
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