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Nefit MZ 100 Manual

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Product details | 9
6 720 815 281 (2014/10)MZ 100
2Product details
• The purpose of the module is to activate the pumps and valves in
– a maximum of 3 unmixed heating circuits
-or-
– a maximum of 2 unmixed heating circuits and a cylinder charging
circuit
-or-
– Systems with 2-port valve (S-schematic, Fig. 22, page 60,
in UK only)
-or-
– Systems with mid-position valve (Y-schematic, Fig 23,
page 61, in UK only)
• The module is used to record
– The temperature of the DHW cylinder
– The temperature at a low loss header (optional)
– Control signals (e.g. from EMS 2/EMS plus controllers, On/Off
controllers, thermostats)
• Anti-seizing protection:
– The connected pump is monitored and exercised for a short while
after 24 hours of downtime. This prevents the pump from seizing.
Irrespective of the number of other BUS participants, a maximum of
3 MZ 100 are permitted in one system depending on which user
interface is installed:
• max. 2 MZ 100 for 6 unmixed heating circuits in total
• max. one MZ 100 for 2 additional unmixed heating circuits and
one cylinder charging circuit
In the as-delivered state, coding switch I is set to position 0. The module
is only registered in the operator control unit if coding switch I is set to a
valid position for heating circuits or cylinder charging circuit.
2.1 Important notices on usage
The module communicates via an EMS 2/EMS plus interface with other
BUS participants that are compatible with the EMS 2/EMS plus.
• The functional scope depends on which user interface is installed,
e.g. BUS communication or I/O controllers. Detailed information
about user interfaces can be found in the catalogue and technical
guides and on the manufacturer's website.
• The installation space must be suitable for the IP rating stated in the
module specification.
2.2 Standard delivery
Legend to fig. 1, page 56:
[1] Module
[2] Bag containing installation materials
[3] Installation instructions
2.3 Specification
The design and operation of this product conform to
European Directives and the supplementary national
requirements. Its conformity is demonstrated by the CE
marking. You can ask for a copy of the declaration of conformity for this
product. For this see the contact address on the back cover of these
instructions.
Temperature sensor pressure drop values
The temperature sensors to be used must be selected in accordance
with the specifications in the technical documentation for the installed
heat appliance, the installed programming unit and, where applicable,
the installed cylinder.
2.4 Cleaning and care
▶ If required, wipe the enclosure with a damp cloth. Never use
chemically aggressive or acidic cleaning agents.
WARNING: Risk of scalding!
▶ If DHW temperatures above 60 °C are set or thermal
disinfection is performed (temperature switch II
temporarily above 60 °C), a mixer must be installed.
NOTICE: Floor damage!
▶ An additional temperature sensor must be used if the
product is to be installed in a heating circuit with
underfloor heating.
Technical data
Dimensions (W × H × D) 151 × 184 × 61 mm (further
dimensions Fig. 2, page 56)
Maximum conductor cross-section
• 230 V terminal
• Extra-low voltage terminal
•2.5mm
2
•1.5mm
2
Rated voltages
• BUS
• Module power supply
• User interface
•Pump and mixer
•15VDC
(reverse-polarity-protected)
• 230 V AC, 50 Hz
•15VDC
(reverse-polarity-protected)
• 230 V AC, 50 Hz
Circuit breaker 230 V, 5 AT
BUS interface EMS 2/EMS plus
Power consumption on – standby <1W
Maximum output
• per connection (PZ1 ... PZ3)
• per connection (IZ1 ... IZ4)
• 400 W (high-efficiency
pumps permissible;
max. 40 A/s)
• 230 V AC, maximum 0.5 A
Preset measuring range of
temperature sensor
•Lower fault limit
•Display range
•Upper fault limit
•<– 10°C
• 0 ... 100 °C
• > 125 °C
Permissible ambient temperature 0 ... 60 °C
IP rating IP44
IP rating I
ID no. Data plate ( Fig. 3, page 56)
Table 7 Technical data
… 9 …


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