Nordica NORMA IDRO DSA Instructions For Installation, Use And Maintenance Manual

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Nordica NORMA IDRO DSA Instructions For Installation, Use And Maintenance Manual Manual pdf 20 page image

NORMA IDRO DSA20 7197130 - IT-EN-DE-FRA section which is too small causes a reduction in draught. A minimum height of 4 m is advisable.The following materials are FORBIDDEN and compromise the good operation of the appliance: asbestos cement, galvanised steel, roughand porous internal surfaces. Picture 2 at page 51 shows some example solutions.The minimum section must be 4 dm2 (for example 20x20 cm) for appliances whose pipe dimensions are less than 200 mm, or 6.25dm2 (for example 25x25 cm) for appliances with a diameter of more than 200 mm.The draught created by your flue must be sufficient but not excessive.A section of the flue which is too large can present a volume which is too large to heat and therefore cause operating difficulties for theappliance; to avoid this, it is necessary to intubate the appliance for its entire height. A section which is too small causes a reduction indraught.The flue must be at a suitably distance from flammable or combustible material using suitable insulation or an air space.It is FORBIDDEN to pass system piping or air ducts inside the flue. It is also forbidden to create moveable or fixed openings on the flueitself, for the connection of further different appliances (See chapter CONNECTING A FIREPLACE OR OPEN HEARTH TO THE FLUE).6.1. CHIMNEY POTThe flue draught depends on the suitability of the chimney pot.It is therefore essential that, if built in a handcrafted way, the exit section is more than twice the internal section of the flue(Picture 3 at page 51) .As it must always go past the ridge of the roof, the chimney pot must ensure exhaust even in the presence of wind (Picture 4 at page 52).The chimney pot must meet the following requirements:• Have an internal section equivalent to that of the chimney.• Have a useful exit section of double the internal section of the flue.• Be built so as to prevent rain, snow or any foreign body entering the flue.• Be easy to inspect, for any maintenance and cleaning operations.6.2. CONNECTION TO THE CHIMNEYProducts with automatic door closing (type 1) must operate, for safety reasons, with the furnace door closed (except during the fuel loadingor ash removal phases).Products with non-automatic door closing (type 2) must be connected to their own flue.Operation with doors open is only allowed when supervised.The connection pipe to the flue must be as short as possible, straight horizontal and positioned slightly in ascent, and watertight.Connection must be carried out with stable and robust pipes (we recommend a thickness of 2 mm) and be hermetically secured to the flue.The internal diameter of the connection pipe must correspond to the external diameter of the cooker flue gas exhaust stub pipe (DIN 1298).ATTENTION: as far as concern the realisation of the flue connection and flammable materials please follow the requirements provided byUNI 10683 standard. The flue must be properly spaced from any flammable materials or fuels through a proper insulation or an air cavity.The chimney pressure (DRAUGHT) must be at least (=1.7-2 mm of water column). The measurement must always be carried out whenthe appliance is hot (nominal calorific power). When the pressure exceeds 20 Pascal, it is necessary to reduce it through the installation ofan additional draught regulator (false air valve) on the exhaust pipe or in the chimney, according to the regulations in force.For correct appliance operation, it is essential that sufficient air for combustion is introduced into the place of installation (see paragraph 7).6.3. CONNECTING A FIREPLACE OR OPEN HEARTH TO THE FLUEThe flue gas channel is the stretch of piping which connects the thermo-product to the flue. In the connection, these simple but extremelyimportant principles must be respected:• under no circumstances use a flue gas channel with a diameter less than that of the exhaust clamp with which the thermo-product isequipped;• each metre of the horizontal stretch of the flue gas channel causes a slight loss of head which must be compensated if necessary byelevating the flue;• the horizontal stretch must never exceed 2 metres (UNI 10683);• each bend of the flue gas channel slightly reduces the flue draught which must be compensated if necessary by elevating it suitably;• The UNI 10683 – ITALY regulation requires that under no circumstances must there be more than 2 bends or variations in directionincluding the intake into the flue.If the user wishes to use the flue as a fireplace or open hearth, it is necessary to seal the hood below the entrance point of the flue gaschannel pos. A Picture 6 at page 53.If the flue is then too big (e.g. 30x40cm or 40x50cm), it is necessary to intubate it with a stainless steel tube with a diameter of at least200mm, pos. B, taking care to close the remaining spaces between the pipe and the flue immediately under the chimney pot pos. C.7. AIR FLOW IN THE PLACE OF INSTALLATION DURING COMBUSTIONAs the thermo-product draw their combustion air from the place of installation, it is MANDATORY that in the place itself, a sufficient quantityof air is introduced. If windows and doors are airtight (e.g. built according to energy saving criteria), it is possible that the fresh air intake isno longer guaranteed and this jeopardises the draught of the appliance and your health and safety. It is therefore necessary to guaranteea supply of fresh air through an external air inlet placed near the appliance or by placing piping for combustion air which leads outside orto a nearby airy place, with the exception of the boiler room or garage (FORBIDDEN).IMPORTANT: For a better comfort and corresponding oxygenation of environment, the stove / insert combustion air can be directlywithdrawn at the outside. In order to do that, the stove can be connected to the external air socket by an junction (Chap. 15 ).The connection pipe must be smooth with a minimum diameter of 100 mm. It must have a maximum length of 4 m and have no more thanthree bends. If it is directly connected to the outside, it must be equipped with a suitable windbreak.The intake of air for combustion in the place of installation must not be obstructed during operation of the thermo-product. It is absolutelyessential that in environments in which thermo-products are operated with a natural chimney draught, as much air as is necessary forcombustion is introduced, i.e. up to 25 m³/hour. The natural recirculation of air must be guaranteed by some fixed openings to the outside.