Installing The Ducts - Baxi LUNA DUO-TEC IN+ Instruction Manual For Users And Fitters

• after filling, turn the screw back to position "C".
SYSTEM PRESSURE RESETTING PHASE
The pressure of the system is automatically reset whenever it drops below ~ 0.8 bar.
The pressure switch requires the filling of water. The text Err 18 is shown on the display of the Room Unit during the filling phase.
The cycle runs for a maximum of ~ 6 minutes. The text Err 19 is shown on the display of the Room Unit if the pressure is not reset
at the end of the filling cycle. The boiler begins a new filling cycle when the fault is reset.
If the fault is caused by blocking of the filling electrovalve, it is possible to proceed manually with the system filling tap.
For the models 24 - 28, the filling tap in the boiler (see SECTION G) must always remain closed.
For models 1.12 - 1.24, the automatic filling electrovalve is located under the circulator. Make sure to protect the electrovalve
against contact with water when opening the central screw of the circulator to release it or to check circulation.
The boiler is fitted with a hydraulic pressure gauge which prevents the boiler from working if there is no water.
The internal function of the electronic board of the appliance (see the section SYSTEM GAS EXTRACTION FUNCTION) is
used to facilitate the elimination of the air inside the heating circuit when the boiler is first installed or after maintenance
when the water is drained from the primary circuit.
Take special care when filling the heating system. In particular, open any thermostat valves in the system, ensure the water
enters slowly in order to prevent the formation of air inside the primary circuit until operating pressure is reached. Lastly,
vent any radiators in the system. BAXI declines all liability for damage deriving from the presence of air bubbles in the
primary exchanger due to the incorrect or imprecise observance of the above.

10. INSTALLING THE DUCTS

The boiler is easy and flexible to install thanks to the extensive range of available accessories, as described below. The boiler
has been designed for connection to a vertical or horizontal coaxial flue-air duct. The boiler can also be used with separate ducts
using the accessory splitting kit.
WARNINGS
C13, C33 The terminals for separate flues must be fitted inside a 50 cm square. Detailed
instructions are provided with the individual accessories.
C53 Do not fit the flue and air duct terminals on opposite walls of the building.
C63 The pressure drop of the ducts must not exceed 100 Pa. The ducts must be certified for
this specific use and for a temperature in excess of 100°C. The flue terminal must be certified
to EN 1856-1.
C43, C83 The flue terminal or flue duct must be suitable for the purpose.
For optimal installation, the accessories supplied by the manufacturer should be used.
To optimise operating safety, make sure the flue ducts are firmly fixed to the wall with
suitable brackets. The brackets must be positioned over the joints at a distance of
approximately 1 metre from one another.
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