Description; Flue - LA NORDICA WF25 DSA Notice D'utilisation Et D'entretien

4. DESCRIPTION

Definition: thermo-fireplace according to EN 13229.
La NORDICA thermo-fireplace are suitable for heating living spaces equipped with a central heating system made up of radiators or
convectors completely or partially replacing the traditional gas or diesel boiler. These are ideal for holiday flats and weekend houses or as
auxiliary heating all year round. Wooden logs are used as fuel. The appliance works as an intermittent operating appliance.
The appliance is composed of painted and galvanised sheet steel and cast iron.
The fireplace is found inside the boiler, is built in 4 mm thick steel and is reinforced using welded nails. The water in the heating system
circulates in the boiler, which absorbs the heat produced in the fireplace. A swivelling, removable grid is found inside the fireplace
( pos. A)
Picture 13 at page 58
The sight door is assembled on extensible ball guides, which assure a robust and silent operation reliable in time. The door lifting counter-
weight is supported by two sturdy chains with related pinions.
The ceramic glass window (resistant up to 700°C) of the door provides a lovely view of the burning flames and prevents sparks and smoke
from getting out.
Room heating takes place:
a) by radiation: the heat is radiated into the environment through the panoramic window and the hot external surfaces of the thermo-
fireplace;
b) by conduction: radiators or heat convectors of the centralised system fed by hot water produced by the boiler.
The device is equipped with registers of primary and secondary air, with which it is possible to adjust the combustion air.
1A- PRIMARY air register
With the air register located under the door of the hearth, it is possible to adjust the air flow through the ash drawer and the grating in
direction of the fuel. The primary air is necessary for the combustion process. In order to open the air flow, the bar must be completely
pulled out. The ash drawer has to be emptied regularly, so that ash cannot hinder the intake of primary air for the combustion. Primary
air is also necessary to keep fire live.
The primary air register must be almost completely closed during wood combustion, as otherwise the wood burns too quickly
and the thermo-product may overheat.
2A- SECONDARY air register
When the bar is pushed to the back the passage of the secondary is completely open.
The secondary air, passing through the two lateral jambs of the front side, heats itself starting the double combustion and keeping at
the same time the glass clean (with open register).
Ash drawer (
Picture 13 at page 58
The adjustment of the registers necessary to reach the rated calorific yield is the following one:
WF25 - WF25X
WF25 Plus

5. FLUE

Essential requirements for a correct operation of the device:
• the internal section must be preferably circular;
• be thermally insulated and water-proof and produced with materials suitable to resist to heat, combustion products and
possible condensates;
• not be throttled and show a vertical arrangement with deviations not greater than 45°;
• if already used, it must be clean;
• observe the technical data of the instructions manual;
Should the flues have a square or rectangular section, internal edges must be rounded with a radius not lower than 20 mm. For the
rectangular section, the maximum ratio between the sides must be = 1.5.
A too small section causes a decrease of the draught. It is suggested a minimum height of 4 m.
The following features are forbidden and therefore they endanger the good operation of the device: asbestos cement, galvanized steel,
rough and porous internal surfaces. In
The minimum section must be 4 dm
(for example 25 x 25 cm) for devices with diameter greater than 200 mm.
The draught created by the flue must be sufficient, but not excessive.
A too big flue section can feature a too big volume to be heated and consequently cause difficulties in the operation of the device; to avoid
this, tube the flue along its whole height. A too small section causes a decrease of the draught.
ATTENTION: as far as concern the realisation of the flue connection and flammable materials please follow the requirements provided by
UNI 10683 standard. The flue must be properly spaced from any flammable materials or fuels through a proper insulation or an air cavity.
It is FORBIDDEN to let plant piping or air feeding channels pass in the same flue. Moreover, it is forbidden to create movable or fixed
openings on the same for the connection of further other devices
20
.
(Picture 9 at page 57)
(Picture 9 at page 57)
pos. B).
Fuel PRIMARY air
Wood Figura 9C CLOSED
Wood Figura 9C CLOSED
Picture 4 at page 53
(for example 20 x 20 cm) for devices whose duct diameter is lower than 200 mm or 6.25 dm
2
TERMOCAMINO WF25 DSA - WF25X DSA - WF PLUS DSA
SECONDARY air
Figura 9C OPEN
Figura 9C OPEN
gives some examples of execution.
(Picture 5 at page 54
TERTIARY AIR
PRE-ADJUSTED
PRE-ADJUSTED
).
6095102 - IT-EN-DE-FR
2