Kota Kuru 14 and 20 sauna heaters
Contents
1. Both hardwood and softwood can be used to heat the sauna heater The use of chipboard fibreboard painted or impregnated wood waste or plastic is prohibited To ensure clean burning and the largest possible efficiency the wood must be dry The moisture content of the wood must be less than 20 Usually good firewood is sticks of wood the diameter of which is around 5 cm length around 33 cm and weight around 0 5 kg Use of liquid fuel is strongly forbidden also during firing 4 2 Heating Before heating make sure that there is no combustible material within the safety clearances Also make sure that the ash drawer and fire grate are clean and if the sauna heater is provided with a water tank that it is filled with clean water Check if there is sufficient draft in the smoke flue If you hesitate regarding the draft check it by burning a small quantity of water in the firebox first During heating the door of the firebox must be closed and the water tank must be filled with water The sauna heater must not be covered with anything To start heating pile firewood over a sufficiently wide area and ignite it from above For ignition you may use birch bark or paper Ignition aid should be placed between the upper firewood and it can be topped with some thinner wood sticks or firewood see drawing 9 Igniting from above reduces pollution and ensures cleaner burning Figure 9 Figure 9 Properly stacked firewood The power of t2. Before you install the sauna heater Before installing and using the sauna heater make sure you are thoroughly familiar with the requirements for installing the sauna heater in the steam room In case of questions and for additional information do not hesitate to contact the Rescue Board or a construction supervision authority When installing fireboxes all local laws have to be followed including those referring to local and European standards 2 1 Steam room If the walls of a steam room are made of uncovered glass brick or concrete add 0 8 1 5 m3 per square meter of such wall and the final choice of the heater shall be made based on the sum of the area If the heater is installed in a sauna that is normally not heated or the sauna is made of mas sive logs multiply the sauna area by 1 5 and choose the heater based on this The recommended minimum area of a steam room is indicated in clause 1 1 Please follow the values for the minimum area stipulated for a steam room We recommend choosing a sauna heater with slightly more power to ensure proper heating of the sauna and to avoid heating the sauna heater to its upper limit Slightly stronger power ensures a longer lifetime of the sauna heater and provides better steam thanks to a greater quantity of stones 2 2 Substrate A firebox must be installed on the floor with sufficient load bearing capacity The durability of the floor must be checked especially carefully when the sauna h
3. and at least 400 mm in front of the sauna heater The sheet metal edges facing the sauna heater must be turned up so that coal cannot get under the in stallation base NARVI Oy Yritt j ntie 14 FI 27230 Lappi tel 358 0207 416 740 fax 358 0207 416 743 e www narvi fi en 5 GB The safety clearance of an uninsulated flue from the structures made of combustible materials is 1000 mm from the sides and 1200 mm from the top 2 3 2 Non combustible structure If the wall is masonry or other structure classified as non combustible it is sufficient to have a 50 mm air gap be tween the upright surfaces and the wall 2 4 Smoke flue A smoke flue of the sauna heater must meet the require ments of class T600 irrelevant of the material of the smoke flue The minimum recommended draft of the smoke flue is 12 Pa A modular smoke flue must meet the requirements of class T600 and provided with CE marking When installing a modular smoke flue safety clearances stipulated in the in stallation manual of the smoke flue shall be followed The minimum recommended diameter of a modular smoke flue is 120 mm The weight of the smoke flue must not cause load on the sauna heater The sauna heater should be con nected to a separate smoke flue A smoke flue made of bricks must be at least the so called half brick smoke flue 2 5 Ventilation Ventilation of the steam room should be sufficiently effi cient and should function so that fresh incomi
4. blue flames on the coal in the firebox Before adding firewood you may even slightly smooth coal on the grate If firewood is added in the flames too early the temperature of fume gases increases Do not use the door to push fire wood in the firebox In case the sauna is used or the sauna heater is heated also after the recommended number of times firewood should be added as shown in the table firewood should not be added according to the quantities mentioned in the table A proper quantity for keeping heat is 1 2 logs ap proximately 1 kg of firewood every half an hour The ash drawer may be closed a bit If you add a big quantity of firewood the temperature of flue gases rises and this can damage the smoke flue and cause a fire hazard But do not heat continuously over 3 hours Thereafter the sauna heat er must be allowed to cool down before the next heating In case the sauna will not be used any longer and coal is still glowing without flame extinguishing can be speeded up by increasing the draft For this open the ash drawer by 10 20 mm There is enough heat accommodated in the stones of the sauna heater to dry the sauna room In the ignition phase the closing pan must be fully open Before you close the closing pan after heating check that there is no glowing coal in the firebox Otherwise fumes may be released in the sauna Carbon monoxide is an odourless and colourless toxic gas If you have not used the sauna heater and sm
5. or Kota smoke flue must be used In case of connection from the above a Kota smoke flue tank for heating water or a Kota stone basket can be installed around the connective flue Do not push the connective flue too deep in the smoke flue because this would hinder the draft Any leaks in the con nective flue also reduce the draft therefore the connections must be sealed with fireproof sealing material Leakage in the connective flue causes combustion gases formed in the sauna heater to ignite in the flue The connection joint of the flue and the sauna heater must be 25 mm The diameter of the connective flue of the sauna heater and the height from the floor are shown in clause 1 1 Please take into account the clearance distance of the modular smoke flue see the manufacturer s instructions 3 4 Installation of a door and changing of the opening direction of the door Figure 7 Figure 7 Open the door and raise the hinge pin up so it comes out of the bottom hinge barrel Hold onto the door securely and turn the bottom part of the pin and turn the bottom end of the pin up enough 2 that you can pull the pin down 3 and the pin and door come apart For instal lation proceed in reverse order First push the upper edge of the door in its place and thereafter push the pin through the upper eyelet Thereafter turn the door and pin in their places from below and let the pin into the bottom eyelet The pin is correctly insta
6. 07 416 743 e www narvi fi en the warranty or other defects that appear later than two 2 years after the delivery of the goods to the client The supplier may decide to either repair the defective goods or replace the defective goods at its own direction The warranty does not cover possible transport unloading or installation costs or other corresponding costs A receipt from the company selling the product serves as proof of warranty The client must check the goods immediately after deliv ery The client must submit a written notice of claims to the supplier within two 2 weeks of discovering the defect or the moment when the defect should have been discovered Do not modify the structure of this product With this prod uct you can only use manufacturer recommended acces sories Failure to comply with the manual or fire safety reg ulations can result in a fire or damage to the sauna heater More detailed information about the fire safety regulations can be obtained from the regional branch of the rescue board for instance The product shall be carefully inspected Improper use of the product is for instance wrong adjustment of the draft too large a guantity of firewood burnt in the firebox too long heating time wrong arrangement of stones too much or too tight and use of salty water for instance sea water The warranty does not cover damages caused by improper use of the sauna heater CE Narvi Oy 13 EN 15821 2010
7. 6 Frequently Asked Questions The sauna heater is drafting poorly e The sauna heater has not been used in a long time the smoke flue and sauna heater are damp e The sauna heater is not receiving sufficient air there is a downdraft in the sauna caused by ventilation e The sauna heater has not been cleaned in a long time e The ash drawer is closed or full of ashes e Leakage in the connective flue The sauna does not heat up properly e The firewood is damp e The sauna heater has insufficient power e The sauna heater or smoke flue is drafting poorly e The stones of the sauna heater are dirty or crumbling or stacked too tightly e There are too many stones or there are too many small stones The sauna heater smells e The sauna heater has not been properly heated the first time it was done e The stones of the sauna heater were not washed before loading e Fat or other dirt has accumulated on the stones e Steam water is not clean 7 Warranty The warranty of the sauna heater described in the in structions is one year The door of the sauna heater may change colour during heating This is a charac teristic feature of stainless steel and is not covered by warranty The warranty period starts form the moment that the goods are delivered to the end user The supplier is not liable in any way for any defects within the framework of NARVI Oy Yritt j ntie 14 FI 27230 Lappi tel 358 0207 416 740 fax 358 02
8. Multi firing sauna stoves fired by natural wood logs for space heating in residential buildings Kuru 14 Fire safety initiation risk to adjacent elements including declared safety Back 250 mm distances to combustible Side 250 mm materials Ceiling 1350 mm Emission of combustible products Pass Surface temperature Pass Release of dangerous substances NPD Cleanability Flue gas temperature Mechanical resistance Thermal output and Energy efficiency as carbon monoxide emission at 13 O Pass 0 57 total efficiency Pass 69 flue draught 12 Pa thermal output i e nominal space heating output 13 kw refuelling loads 7 5 kg Durability Pass CE Narvi Oy 13 EN 15821 2010 Multi firing sauna stoves fired by natural wood logs for space heating in residential buildings Kuru 20 Fire safety initiation risk to adjacent elements including declared safety Back 250 mm distances to combustible Side 250 mm materials Ceiling 1350 mm Emission of combustible products Pass Surface temperature Pass Release of dangerous substances NPD Cleanability Flue gas temperature Mechanical resistance Thermal output and Energy efficiency as carbon monoxide emission at 13 O Pass 0 81 total efficiency Pass 67 flue draught 12 Pa thermal output i e nominal space heating output 16 k
9. W refuelling loads 10 kg Durability Pass NARVI Oy Yritt j ntie 14 FI 27230 Lappi tel 358 0207 416 740 fax 358 0207 416 743 e www narvi fi en
10. anual for future reference This user manual contains the technical data of your sauna heater and installation use and maintenance instructions The products are meant only to be used as a sauna heater and for heating the sauna Do not modify the design of the sauna heater and use only spare parts and accessories recommended by the manufacturer The data plate includ ed in the delivery of the sauna heater must be glued on the sauna heater preferably on the lower part of the cover of the sauna heater Do not heat the sauna heater if you lack sufficient knowl edge if you are not allowed to use a sauna because of your health condition or you are under the influence of substances causing intoxication Sauna heaters must not be used by underage people Do not leave children in the sauna without supervision A sauna is not meant for drying clothes 1 1 Technical data Diameter of the connective ET 119 119 Distance of the bottom edge of the connective 473 473 flue from the floor without adjustable feet mm Distance of the bottom edge of the connective 500 500 flue from the floor with adjustable feet 15 mm Weight without stones kg 49 55 Weight of the stones 10 15 cm kg 35 40 Size of the steam room m3 8 14 10 20 Thickness of the cover of the furnace mm ES EN NARVI Oy Yritt j ntie 14 FI 27230 Lappi tel 358 0207 416 740 fax 358 0207 416 743 e www narvi fi en 2
11. eater is in stalled on a wooden floor The weight of the sauna heater is shown in clause 1 1 CONCRETE FLOOR The sauna heater may be installed directly on a concrete floor which is at least 50 mm thick If underfloor heat ing cables or pipes are located under the sauna heater a Kota installation base must be used to protect them from the sauna heater s thermal radiation FLOOR MADE OF COMBUSTIBLE MATERIAL OR A TILED FLOOR UN DERFLOOR HEATING A Kota installation base must be installed under the sauna heater which will protect the floor moisture barrier and un derfloor heating pipes or cables from the thermal radiation of the sauna heater 2 3 Safety clearances When installing the sauna heater safety clearances must be taken into account Ignorance of safety clearances causes a fire hazard If required additional information can be obtained from the regional branch of the rescue board 2 3 1 Structure made of combustible materials The safety clearances are the minimum allowable dis tances between the sauna heater and structures made of combustible materials Thus clearances from walls floor ceiling boards and other objects and firewood storage area must be observed Top surface 1350 mm Front surface 500 mm Side surface 250 mm Back surface 250 mm We recommend leaving 1000 mm maintenance area in front of the sauna heater The safety clearance can be reduced by 50 when a single light protective
12. he sauna heater can be regulated by the ash drawer In case of this sauna heater opening of the ash drawer is limited When the door is closed the ash drawer opens approximately 10 mm which is a suitable position to ignite the fire and for heating If it soughs too much in the sauna heater reduce the draft To do this close the ash drawer halfway or completely This way heat reaches bet NARVI Oy Yritt j ntie 14 FI 27230 Lappi tel 358 0207 416 740 fax 358 0207 416 743 e www narvi fi en ter in the sauna heater stones can store heat and you do not just heat up the flue A calm flame is a sign of a correct draft Avoid heating the sauna heater so that the chan nels of the stone compartment glow red for a long time because this will overload the firebox and the service life of the sauna heater will be reduced Overheating may also cause excessive heating of the smoke flue and cause a fire hazard The connective flue pipe must not be glowing red The following table shows the recommended guantities of firewood for different types of sauna heaters and po sitions of the ash drawer The values shown in the table meet the values of the nominal power pursuant to standard EN15821 In the test the size of the sauna was determined based on the maximum area for the given sauna heater and temperature of 90 C was achieved in the sauna Dur ing first times we recommend using less firewood for achieving the desired temperature than values prese
13. lled when the wider areas of the pin are facing down In this case the pin cannot move away from its place Door installation is easier when you use long flatnose pli ers When removing and installing the door please take into account the higher element washer between the hinge barrel and the door Finally also install the bolt located on the side of the handle and nut on the upper edge of the hatch 3 5 Sauna heater stones We recommend that you use Kota olive dolerite stones Natural stones are not suitable to be used as sauna heater stones Before using the stones they must be washed NARVI Oy Yritt j ntie 14 FI 27230 Lappi tel 358 0207 416 740 fax 358 0207 416 743 e www narvi fi en 7 GB GB to eliminate any impurities Bigger stones are placed in the bottom of the stone compartment and the rest are piled sparsely so that air can move freely between the stones The stones must not block air openings and stones must not be stacked over the top surface of the sauna heater The recommended quantity of stones in the sauna heater is shown in clause 1 1 Use of light weight stones is forbidden 3 6 Air flow direction adjusting plates of the sauna heater Kota Kuru AIR FLOW DIRECTION ADJUSTING PLATES 8 NARVI Oy Yritt j ntie 14 FI 27230 Lappi tel 358 0207 416 740 fax 358 0207 416 743 e www narvi fi en 4 Using the sauna heater 4 1 Firewood
14. ng air is rout ed as close to the sauna heater as possible Also proper air circulation has to be provided in the steam room during using the sauna so that air can exit from under the sauna bench or from under the door of the washing room suf ficient gap Extraction fans working in the same room as the firebox may cause problems Incoming air inlets should be located so that they do not get blocked for instance because of snow A firebox needs combustion air in a volume of 6 10 m3 per kilo of fired wood The diameter of the ventila tion opening must be at least 100 mm Forced air system should be built according to the design prepared by the designer of the heating water and ventilation systems After using the sauna there shall be a possibility to ventilate and dry the sauna rooms so that air exits via the upper part of the steam room EJ GN NARVI Oy Yritt j ntie 14 FI 27230 Lappi tel 358 0207 416 740 fax 358 0207 416 743 e www narvi fi en 3 Installation and preheating of the sauna heater 3 1 Preheating Before use and arranging the stones the sauna heater must be heated to remove the protective agents Any pro tective films and stickers must have been removed before Preheating shall be carried out on a non combustible surface and outside since paint emits harmful solvents and smoke during heating Use of a connection pipe in cluded in the delivery of the sauna heater in the upper joint improves draft d
15. nt ed in the table Maximum guantity of firewood per hour max kg h indicated in the table must not be exceeded Heating of the sauna Kuru sauna heater 1 firebox of firewood quantity of firewood kg 3 5 4 1 addition quantity of firewood kg 2 3 2 addition quantity of firewood kg 2 3 max kg h 6 7 5 Sticks of firewood with a diameter around 5 cm length around 33 cm and weight around 0 5 kg Do not stack firewood in the firebox over 2 3 of its height Quantities of firewood are shown in clause 4 1 In the igni tion phase the ash drawer can be kept open by 10 mm more than indicated in the table After igniting put the ash drawer back in the position as shown in the table In a sauna heater equipped with a water tank or in a sauna heater that is heated from another room firewood should not be burnt in the front part of the firebox in the exten sion but the firewood must be placed entirely on the grate of the firebox Do not forget that the sauna heater and its part become very hot during heating If you need to touch the parts of the sauna heater always use protective gloves When moving around in the sauna be careful because the floor and the ceiling of the sauna may be slippery Be careful water in the water tank of the sauna heater may be very hot One firebox of firewood burns approximately half an hour A good time for adding firewood is when there are still some
16. ntenance of the sauna heater Besides removing the ashes and having the chimney annu ally cleaned by a chimneysweep the sauna heater reguires no other maintenance To open the cleaning hatch of the sauna heater the upper stones have to be removed from the sauna heater The stones of the sauna heater have to be re arranged once per year and replaced every other year Cracking stones collapse and fall lower some stones will erode Re move eroded and broken stones Due to insufficient main tenance the sauna heater needs more time for heating which in its turn causes load on the structure of the sauna heater The enamel surface of the sauna heater should be cleaned regularly with a damp cloth Also the water tank of the sauna heater should be regularly cleaned Use only clean water to fill the tank If there is a danger that water can freeze the water tank should be emptied 4 6 Disposal For disposal take the sauna heater to a public waste recy cling centre NARVI Oy Yritt j ntie 14 FI 27230 Lappi tel 358 0207 416 740 fax 358 0207 416 743 e www narvi fi en 5 Soot fire IN CASE OF SOOT FIRE ALSO IF IT HAS ALREADY BEEN EXTINGUISHED ALWAYS INFORM THE EMERGENCY CENTRE If you detect soot fire in the smoke flue close the ash drawer and the door of the firebox immediately After soot fire and before the next use of the sauna let a chimney sweeper check the condition of the smoke flue and the sauna heater
17. oke flue for a longer period or it is cold please check before use that the smoke flue is in proper order and that there are no cor rosion damages on the sauna heater Start heating very slowly and with small quantity of firewood so that not to damage the smoke flue 4 3 Steam water Use normal domestic water for steam water Quality requirements for domestic water humus content lt 12 mg l iron content lt 0 2 mg l calcium content lt 100 mg l manganese content lt 0 05 mg l Do not use sea water or other salty water Also do not use water containing chlorine The warranty of the sauna heat er does not cover damages caused by the use of unsuit able steam water Do not throw water on the stones if you yourself or somebody else is right next to the sauna heater Hot water steam may cause burns 4 4 Removing the ashes The ash drawer must be emptied every time before heating the sauna heater The ash drawer must be emptied imme diately if ashes fill more than half of the drawer Otherwise the airflow through the firebox grate will be hindered which will shorten the life of the grate The ash drawer must be emptied in a non combustible container for instance metal bucket after ash has cooled down Do not leave the ash bucket standing by the wall for instance on the terrace If the smoke flue is equipped with a closing pan it should be opened for the time the ash is removed Dust will escape with the draft 4 5 Mai
18. screen is used and by 25 when a double light protective screen is used Yet the gap between the sauna heater and the protective screen must always be at least 50 mm The safety clearance between the sauna heater and the ceiling can be reduced by maximum 300 mm when a single protective screen is used It is not per mitted to use a double protective screen in the ceiling A single light protective screen can be made of a non combustible fibre reinforced cement plate that is at least 7 mm thick or a metal plate that is at least 1 mm thick which is attached to the wall sufficiently tight An air gap of at least 30 mm must be left between the surface to be protected and the board A double protective screen can be made of the two abovementioned boards Ain air gap of at least 30 mm must be left between the boards and the wall There must be a gap between the protective screeds and the floor and ceiling so that air can circulate and cool the gaps between the boards 120 mm masonry structure at a distance of 30 mm from the surface to be protected corresponds to a double protective screed We recommend using factory made double Kota protective screeds Protecting a wall made of combustible material If the sauna heater is installed on a floor made of combustible materials an installation base must be used A piece of sheet metal must be installed in front of the installation base which extends at least 100 mm over the sides of the heater hatch
19. uring preheating 1 2 fireboxes of wood are sufficient for preheating After preheating and before arranging the stones loose cover material should be re moved from the stone compartment of the sauna heater with a steel brush In case the external surface of the sauna heater is painted it should not be rubbed or wiped before the first heating The paint of the sauna heater will achieve sufficient strength only after the first heating Do not create steam during the first heating NB If the sauna heater is equipped with a water tank please check before preheating that the water tank faucet and safety plug are installed and that the tank is filled with clean water 3 2 Regulation of the height The legs of the sauna heater are adjustable and can be used for levelling the sauna heater and for adjusting the height There must be an air gap of at least 25 mm between the sauna heater and the floor Use a spirit level to check if the sauna heater is level Figure 6 Figure 6 Installation of adjustable legs additional equipment 3 3 Connection with the stack The sauna heater can be connected to the smoke flue from the top or back of the sauna heater Seal the unused open ing with the supplied cover The sauna heater comes with a short smoke flue connection pipe which can be used to connect the sauna heater s smoke flue from the back If the connection with the smoke flue is done from the above a Kota connective flue
20. version 1 0 Made by NARVI Oy Finland yah o Kota Kuru 14 and 20 sauna heaters z Installation user and maintenance instructions E 0 eo oe mapt ej NARVI Oy Yritt j ntie 14 FI 27230 Lappi tel 358 0207 416 740 fax 358 0207 416 743 e www narvi fi en 1 1 2 1 2 2 2 3 2 4 2 5 3 1 3 2 3 3 3 4 3 5 3 6 4 1 4 2 4 3 4 4 4 5 4 6 NARVI Oy Yritt j ntie 14 FI 27230 Lappi tel 358 0207 416 740 fax 358 0207 416 743 e www narvi fi en Content Technical data Before you install thes sauna a heater Cee Steam room Substrate Safety clearances Smoke flue Ventilation Installation and preheating of the sauna heater cree Preheating E Regulation of the height Connection with the smoke flue KIORE ELT Installation of a door and changing of the opening direction of the door Sauna heater stones Air flow direction adjusting plates of a sauna heater mmm Using the sauna heater mn FIISWOO0 oot aN Oa maut Nal a FIGatIla masa iE Steam water Removing the ashes Maintenance of the sauna heater Disposal Soot fire Frequently Asked Questions Warranty 0 N Nomun for OE Kota Kuru 14 and 20 Introduction Thank you for having chosen a Kota sauna heater To make the most of your sauna heater please read the manual carefully before you start installing and using it and keep the m
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