Nordica CORTINA Instructions For Installation, Use And Maintenance Manual

Contents

Nordica CORTINA Instructions For Installation, Use And Maintenance Manual Manual pdf 21 page image

CORTINA – CORTINA Forno7196100 Rev.08 – EN 214.1. FIRST-AID MEASURESShould any fire arise in the stack or in the flue:a) Close the feeding door and the ash drawer door.b) Close the registers of combustion airc) Extinguish the fire using carbon dioxide fire-fighting means (CO2 dust).d) Seek immediate intervention of FIRE BRIGADE.DO NOT EXTINGUISH FIRE USING WATER JETS.When the fire has been extinguished, let the flue check by an expert to find possible cracks and permeablepoints.5. FLUEEssential requirements for a correct operation of theappliance:• the internal section must be preferably circular;• be thermally insulated and water-proof andproduced with materials suitable to resist to heat,combustion products and possible condensates;• not be throttled and show a vertical arrangementwith deviations not greater than 45°;• if already used, it must be clean;• observe the technical data of the instructionsmanual;Should the flues have a square or rectangular section,internal edges must be rounded with a radius not lowerthan 20 mm. For the rectangular section, the maximumratio between the sides must be ≤ 1.5.A too small section causes a decrease of the draught. Itis suggested a minimum height of 4 m.The following features are forbidden and therefore theyendanger the good operation of the appliance: asbestoscement, galvanized steel, rough and porous internalsurfaces. Picture 3 gives some examples of execution.The minimum section must be 4 dm2 (for example 20x 20 cm) for appliances whose duct diameter is lowerthan 200 mm, or 6.25 dm2 (for example 25 x 25 cm) forappliances with diameter greater than 200 mm.The draught created by the flue must be sufficient, but notexcessive.A too big flue section can feature a too big volume to be heated and consequently cause difficulties in theoperation of the appliance; to avoid this, tube the flue along its whole height. A too small section causes adecrease of the draught.The flue must be properly spaced from any flammable materials or fuels through a properinsulation or an air cavity.It is forbidden to let plant piping or air feeding channels pass in the same flue. Moreover, it is forbidden tocreate movable or fixed openings on the same for the connection of further other appliances.5.1. CHIMNEY CAPThe 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 internalsection of the flue.Picture 3(1) AISI 316 steel flue with double chamberinsulated with material resistant to 400°C.Efficiency 100% excellent.(2) Refractory flue with insulated doublechamber and external coating in lightweightconcrete. Efficiency 100% excellent.(3) Traditional clay flue showing a square sectionwith cavities. Efficiency 80% excellent.(4) Avoid flues with rectangular internal sectionwhose ratio differs from the drawing.Efficiency 40% poor.A+1/2AAMax.A+1/2A(3)(1) (2)(4)