Flue; Chimney Cap - Nordica 50 Mode D'emploi

a) by convection: the passage of air through the coating and the covering hood releases heat in the room.
b) by radiation: through the sight glass and the steel body, heat is radiated into the room.
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 (Picture
With the air register located under the door of the hearth (on the left), 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 during the ignition. In order to open the
passage of primary air the lever should be completely pulled.
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.
During the combustion of wood, the primary air register must be opened only a few, since otherwise the wood burns quickly and
the device can overheat (see chapter NORMAL OPERATION).
2A - SECONDARY air register
Under the door of the hearth (on the right) there is the secondary air register.
This register must be opened (and therefore the lever completely pushed), in detail, for the combustion of wood, so that unburnt
carbon can be subject to a post-combustion, increasing the yield and assuring the cleaning of the glass (see chapter NORMAL
OPERATION). It is possible to get the air SECONDARY directly from outside through a flexible tube (fireproof NOT furnished
Picture 11 Ref A).
The adjustment of the registers necessary to reach the rated calorific yield is the following one:
Hourly consumption
( kg/h )
PRIMARY AIR
SECONDARY AIR
TERTIARY AIR

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
dm (for example 25 x 25 cm) for devices with diameter greater than 200 mm.
2
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

CHIMNEY CAP

The draught of the flue depends also on the suitability of the chimney cap.
Therefore, if it is handicraft constructed, the output section must be more than twice as big as the internal section of the flue.
Should it be necessary to exceed the ridge of the roof, the chimney cap must assure the discharge also in case of windy weather
(Picture 5 - Picture 6).
The chimney cap must meet the following requirements:
• have internal section equivalent to that of the stack.
• have a useful output section twice as big as the flue internal one.
8)
(Picture 83)
INSERTO INSERTO
50 Crystal 50v Crystal BII
1,8 2,4
CLOSED CLOSED
OPENED OPENED
PRE- PRE-
ADJUSTED ADJUSTED
Picture 3
gives some examples of execution.
(for example 20 x 20 cm) for devices whose duct diameter is lower than 200 mm or 6.25
2
INSERTO INSERTO
50v p30 Crystal 70 Crystal
1,7
CLOSED CLOSED
OPENED OPENED
PRE-
PRE-ADJUSTED
ADJUSTED
ENgLIsH
INSERTO
80 Cry EVO
2,7 2,8
CLOSED
OPENED
PRE-
ADJUSTED
(Picture 4).
INSERTO
100 Crystal
2,8
CLOSED
OPENED
NO
23