Cascade Ducts; Electrical Connections - Baxi LUNA DUO-TEC MP 1.90 Manual De Uso

10.3 CASCADE DUCTS

This type of duct evacuates the products of combustion of more than one boiler in a cascade connection through a shared fumes
collector. The collector may only be used to connect the boilers to the flue duct. The following diameters are available: Ø160 mm
and Ø200 mm. A range of accessories is available on request.
TABLE 1B
MAXIMUM NUMBER OF BOILERS
IN A CASCADE CONNECTION
BOILER
MODEL
Ø160 mm
(250 kW Max)
1.90 2
1.110 2
In this outlet typology, a fumes clapet valve (no-return valve), Ø 110/110 mm, must be fitted to each boiler. Change the para-
meter P46(a) as shown in table 1B following the procedure described in chapter 14.
The fumes duct must be calculated by a qualified technician during the system design stage, as required by current regulations.

11. ELECTRICAL CONNECTIONS

This machine is only electrically safe if it is correctly connected to an efficient earth system in compliance with current safety re-
gulations. 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.
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 M1, M2, M3, used for the electrical connections, after removing the protective cover. The 3.15 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 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 blocks M1- M3 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).
TERMINAL BLOCK M1
(L) = Live (brown)
(N) = Neutral (light blue).
= Earth (yellow-green).
(1) (2) = contact for Ambient 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
is installed.
TERMINAL BLOCK M2
Terminals 1 (back-lighting) - 2 (earth) - 3 (+12V): connection to the
Remote Control (low voltage) supplied as an accessory.
Terminals 4 - 5 (common): External Probe connection (supplied as
an accessory)
Terminals 6 - 5 (common): 2nd Auxiliary Probe (probes for solar
plant, cascade system, zone system, etc.).
Terminals 7 - 5 (common): 1st Auxiliary Probe (probes for solar
plant, cascade system, zone system, etc.).
Terminals 9-10: storage boiler sensor connection.
Terminal 8: not used.
7104645.02 (1-01/12)
PARAMETER P46(a)
Minimum power rpm
Ø200 mm
G20
(500 kW Max)
5 1450
4 1500
28
G31
1650
1500