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Buderus MCM10 Manual

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Installation
MCM10
66
To safeguard the splashproof rating (IP): route cables so
that the cable sheath extends into the cable grommet by
at least 20 mm (Æ fig. 12).
Fig. 12 Splashproof
B Ensure connection to the correct poles (9 = negative,
10 = positive) to prevent faulty functions.
3.2.2 230 V AC connection
B Only use cable of comparable quality.
B Never connect additional controllers that regulate other
system components to outputs C (pump) and D (fault
signal).
B Recommendation when using several MCM10
modules (cascade with more than 4 boilers): provide
the additional MCM10 modules with power via the
MCM10 master module. This ensures simultaneous
commissioning.
3.2.3 Remote fault indicator connection
A remote fault indicator with acoustic or optical indication
(e.g. fault indicator) can be connected to the zero volt fault
contact (Æ fig. 3, terminals D, page 59). The state of the
fault contact is also indicated via an LED on the
MCM10 module (Æ tab. 10, page 68).
This zero volt contact carries a maximum current of 1 A at
230 V AC.
3.2.4 Electrical connection of the outside
temperature sensor
In conjunction with a heating controller with 2-wire BUS
control, connect the outside temperature sensor to the
MCM10 master module (Æ fig. 3, page 59) and not to
the boiler.
3.2.5 Electrical connection of the flow
temperature sensor
Flow temperature sensor connection (Æ fig. 3, page 59):
• System version 1: at the WM10 low loss header
module; or
• System versions 2, 3 and 4: at the MCM10 module
(terminal E).
3.2.6 Electrical connection of an external
switching contact
Prior to connecting an external switching contact, remove
the jumper from the plug-in strip.
3.2.7 Disposal
B Dispose of packaging in an environmentally
responsible manner.
B When replacing components, dispose of the used
components in an environmentally responsible manner.
3.3 Fitting accessories
B Fit accessories according to legal requirements and
the installation instructions supplied.
B Connect BUS subscribers RC35, WM10 and MM10
at terminal J (Æ fig. 3, page 59).
CAUTION: The MCM10 module input is not
fuse-protected.
Overloading the outputs can damage the
MCM10 modules.
B Fuse-protect the power supply of the
MCM master module with a maximum of
16 A.
CAUTION: Output C (pump) of the MCM10
module has a maximum load capacity of
250 W.
B Connect pumps with a higher power
consumption via relays.
The maximum power consumed by the
system components (pump, ...) must not
exceed specifications (Æ tab. 3 page 60).
7 746 800 090-07.1O
≥20 mm
Situation Contact, operating state
Power ON, no fault
Power ON, fault or no power
Tab. 9 Contact, operating states
The remote fault indicator is enabled when
the power supply to the MCM10 master
module is interrupted (function check).
… 66 …


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