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Nefit MP 100 Manual

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6 720 813 962 (2014/12)MP 100
Installation | 9
2.3 Cleaning and care
▶ If required, wipe the enclosure with a damp cloth. Never
use chemically aggressive or acidic cleaning agents.
2.4 Additional accessories
For precise information regarding suitable accessories, refer to
the catalogue.
• For a mixed swimming pool circuit:
– Mixing valve actuator; connection to VC1 (follow the
technical documentation of the installed heat pump for
the correct positioning of the mixer)
– Swimming pool temperature sensor; connection to
TC1.
Installation of additional accessories
▶ Install the additional accessories in accordance with legal
requirements and the instructions supplied.
3 Installation
3.1 Installation
▶ Install the module on a wall ( Fig. 3 to Fig. 5, page 52) or
on a mounting rail ( Fig. 6, page 53).
▶ When removing the module from the mounting rail, refer to
Fig. 7 on page 53.
▶ Install the swimming pool temperature sensor TC1
( Fig. 1 [3], page 51) in a suitable place ( Fig. 16,
page 57).
3.2 Electrical connection
▶ Observe current regulations applicable to power
connections, and use at least cable type H05 VV-…
3.2.1 Connecting the BUS connection and temperature
sensor (extra-low voltage side)
▶ If the conductor cross-sections are different, use the
junction box to connect the BUS nodes.
▶ Connect BUS nodes [B] via junction box [A] in star
( Fig. 12, page 55) or via BUS nodes with 2 BUS
connections in series ( Fig. 16, page 57).
Maximum total length of BUS connections:
• 100 m at 0.50 mm
2
conductor cross-section
• 300 m at 1.50 mm
2
conductor cross-section
▶ 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 earthing system, e.g. to a free earth conductor
terminal or water pipe, and not to the earth connecting
terminal in the module.
When sensor leads are extended, apply the following lead
cross-sections:
• Up to 20 m with 0.75 mm
2
to 1.50 mm
2
conductor cross-
section
• 20 m up to 100 m with 1.50 mm
2
conductor cross-section
▶ Route cables through the grommets provided and connect
them as shown in the connection diagrams.
IP rating
• For installation in
heat source
• For wall-mounted
installation
• Is determined by the IP rating
of the heat source
•IP44
IP rating I
ID no. Data plate ( Fig. 15, page 56)
°C Ω °C Ω °C Ω
20 14772 44 5730 68 2488
26 11500 50 4608 74 2053
32 9043 56 3723 80 1704
38 7174 62 3032 86 1421
Table 3 Pressure drop values of the supplied swimming pool
temperature sensor
DANGER: Risk of electric shock!
▶Before installing this product: completely
disconnect heat appliances and all other
BUS nodes from the mains voltage.
▶ Before commissioning: fit the cover
( Fig. 14, page 55).
Specifications
Table 2
If the maximum total length of the BUS
connections between all BUS nodes is
exceeded, or if the BUS system is realised as a
ring structure, the system cannot be
commissioned.
… 9 …


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