Electrical Connections - Baxi LUNA DUO-TEC IN+ Instruction Manual For Users And Fitters

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 mm
To access the terminal block, remove the front boiler panel (fixed with two screws at the bottom), turn the control box downwards
and access terminal blocks, used for the electrical connections, after removing the protective cover. The 2 A fast-blowing fuses are
incorporated in the power supply terminal block (to check and/or replace the fuse, pull out the black fuse carrier).
SEE WIRING DIAGRAM IN ANNEX "SECTION" B AT THE END OF THIS MANUAL.
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.
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 the input polarity on terminal block M1: L (LINE) - N (NEUTRAL).
ACCESS TO THE BOILER CONTROL BOX
Access the boiler control box following this procedure (see figure below):
• power off the boiler;
• remove the front panel of the template box, when applicable, and of the boiler (secured with 2 screws);
• slide the control box carefully away from the side of the boiler;
• put the control box in place;
• when done, put the control box back in its original place.
CG_2484
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
modulating Room Unit supplied with the boiler is not
connected.
TERMINAL BLOCK M2
Terminals 1 - 2: Room Unit connection (low voltage).
Terminals 4 - 5: External Sensor connection (supplied as an
accessory).
Terminals 6 - 8: not used.
Terminal 7: ----.
Terminals 9 - 10: DHW storage boiler sensor connection (only
for mono-thermal boilers 1.12-1.24).
RELAY INTERFACE TERMINAL BLOCK (S.R.)
Terminals 1 (common) - 2 (closed) - 3 (open): potential-free contacts, and for configuration of these see parameter P04
described in the section "SETTING PARAMETERS".
Terminals 5 (common) - 6 (closed) - 7 (open): contacts 5 and 7 used to control the automatic system filling valve.
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.
7689490.01 (1-09/17)
cable with a maximum diameter of 8 mm.
2
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