Electrical Connections; Connecting The Room Thermostat; Accessories Not Included In The Supply; External Sensor - De Dietrich MPX 24 COMPACT Notice D'emploi Et D'installation

11. ELECTRICAL CONNECTIONS

This machine is only electrically safe if it is correctly connected to an efficient earth system in compliance with current safety
regulations. Connect the boiler to a 230V single-phase earthed power supply using the supplied three-pin cable, observing correct
Live-Neutral polarity.
Use a double-pole switch with a contact separation of at least 3 mm.
When replacing the power supply cable, fit a harmonised "HAR H05 VV-F" 3x0.75 mm2 cable with a maximum diameter of 8 mm.
The 2A fast-blowing fuses are incorporated in the power supply terminal block (to check and/or replace the fuse, pull out the black
fuse carrier).
Rotate the control box downwards and access terminal blocks M1 and M2, used for the electrical connections, by removing the
safety cover.
Make sure that the overall rated power input of the accessories connected to the appliance is less than 2A. If it is higher, install
a relay between the accessories and the electronic board.
Terminal block M1 is at high voltage. Before making connections, make sure the appliance is disconnected from the power
supply.
TERMINAL BLOCK M1
(L) = Live (brown)
(N) = Neutral (light blue).
= Earth (yellow-green).
(1) (2) = contact for Room Thermostat.
Put back the jumper on terminals 1-2 of boiler terminal
block M1 if the room thermostat is not used or if the
Remote Control, supplied as an accessory, is not
installed.
TERMINAL BLOCK M2
Terminals 1 - 2: connection to the Remote Control (low voltage) supplied as an accessory.
Terminals 4 - 5 : external Probe connection (supplied as an accessory)
Terminals 3-6-7-8: not used.
Terminals 9-10: storage boiler sensor connection.
If the appliance is connected to an underfloor system, install a limit thermostat to prevent the latter from overheating.
Use the relative cable grommets at the bottom of the boiler to thread the cables through to the terminal blocks.

11.1 CONNECTING THE ROOM THERMOSTAT

The connections in terminal block M1 are high voltage (230 V). Before making connections, make sure the appliance is
disconnected from the power supply. Respect polarity L (LIVE) - N (NEUTRAL).
To connect the Room Thermostat to the boiler, proceed as described below:
• switch off the boiler;
• access the terminal block M1;
• remove the jumper from the ends of contacts 1-2 and connect the wires of the Room Thermostat;
• switch on the boiler and make sure the Room Thermostat works correctly.

11.2 ACCESSORIES NOT INCLUDED IN THE SUPPLY

11.2.1 EXTERNAL SENSOR

To connect this accessory, see figure to side (terminals 4-5)
and the instructions supplied with the sensor.
SETTING THE "Kt" CLIMATE CURVE
When the external sensor is connected to the boiler, the
electronic board adjusts the flow temperature calculated
according to the set Kt coefficient. Select the required curve by
pressing as indicated in the chart in annex SECTION
E for selecting the most appropriate one (00 to 90).
KEY TO CHART - "SECTION" E
Flow temp
SIEMENS
QAC34
Outside temp
11
M2
1
2
3
4
5
6
7
8
9
10
M1
L
N
1
2
M2
1
2
3
4
5
6
7
8
9
10
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