NARVI Aitokiuas 47 Traditional Sauna Stove User Manual

NARVI Aitokiuas 47 Traditional Sauna Stove

Product Information

Specifications

• Model: Aito AK-47 / AK-57 / AK-57K
• Material: Ceramic or Olivine stones
• Sauna Room Volume: Not specified
• Foundation: Required
• Smoke Flue: Necessary for installation
• Fuel: Not specified

Product Usage Instructions

1. Assembly
   The sauna stove is delivered in pre-assembled parts that are to be put together without mortar at the desired location.

2. Materials
   The Aito sauna stove is available in three models: AK-47, AK-57, and AK- 57K.

3. Sauna Stones
   You can choose between ceramic or olivine stones for the sauna stove.

4. Foundation and Smoke Flue
   During installation, ensure that the stove is not subjected to any stresses from the chimney.

5. Cleaning and Maintenance
   Regularly clean the sauna stove and replace the stones when necessary to maintain optimal performance.

FAQ (Frequently Asked Questions)

• Q: What type of stones are recommended for the sauna stove?
  A: You can choose between ceramic or olivine stones based on your preference.

• Q: How should I clean the sauna stove?
  A: For general cleaning, use a soft brush or cloth to remove any dirt or soot buildup. Refer to the user manual for specific cleaning instructions.

Aito AK-47 / AK-57 / AK-57K
Thank you for choosing our heat-storing Aito sauna stove. To make the most of your sauna stove please read the manual carefully before you start installing and using it.

General information

Aito sauna stove is the traditional heat-storing sauna stove, which lets you enjoy a steam in its truest form. The stones are heated at once into a red glow, after which the clos-ing pan is closed. The mass of the sauna stove and the amount of stones guarantee long, soft and oxygen-rich steam for many hours. The sauna stove will be shipped in parts that are ready to be installed. The parts will be assembled without plaster onto the desired spot.

Materials
The casing of the sauna stove is made of stylish black enamel-lined sheet metal. The glassy surface rejects dirt and dust and is easy to maintain clean. Enamelling protects steel and helps to prevent corrosion and at the same time strengthens the casing of the sauna stove. The casing is insulated and the insulation is protected with rustproof sheet metal. The firebox is made of fireproof mass and cast elements. The stone compartment is lined with firebricks. The firebox hatch, the grate and the inner lid are made of cast iron.

Distance of the bottom edge of the connecting flue 60° from the floor (mm)|

1280*

|

1460*

|

1680*

Distance of the connecting flue centre point from the rear edge of the sauna stove (mm)|

110

|

120

|

120

Length of firewood (cm)| 32| 41| 41

The height of the connective flue is valid when the sauna stove is at a distance of 50 mm from the flue located in the rear. If the top cover of the sauna stove is turned, the height is to be measured separately.

Sauna stove stones
Suitable sauna stove stones are ceramic and olivine stones.

Area of the steam room

• If the walls of a steam room are made of uncovered brick or concrete add 0.8–1.5 m3 per square meter of such wall and the final choice of the stove shall be made based on the sum of the area.
• If the stove is installed in a sauna that is normally not heated or the sauna is made of massive logs, multiply the sauna area by 1.5 and choose the stove based on this.
• For sauna stoves AK 57K–AK 110 the recommended height of the sauna is 2700 mm as a minimum, so the sauna bench remains high enough from the surface of the sauna stove. A space with a minimum size of one meter must be left in front of the sauna stove to facilitate mainte-nance of the firebox.

Substrate
AK sauna stoves must be installed on a stable, fireproof base. NB! The surface temperature of the floor tiles under the sauna stove may increase to 250° C. Such temperature may damage the moisture barrier if it is installed under the sauna stove or the underfloor heating.

Smoke flue

NB!
When connecting the sauna stove with the smoke flue it has to be ensured that no excessive load is applied on the sauna stove.

MASONRY SMOKE FLUE
According to the requirements of part E3 of the Building Act concerning smoke flues, a masonry smoke flue must be the so-called half-brick flue, the minimum length of the smoke flue is 3 meters measured from the top of the stove.

MODULAR FLUE

• A modular flue must meet the requirements of class T600 and provided with CE marking. When installing a modular flue safety clearances stipulated in the installation manual of the flue shall be followed.
• The diameter of the modular flue shall be 150 mm.

Safety clearances to combustible structures
Safety clearances of wood-burning sauna stoves to combustible structures without additional shielding:

AK-47 / AK-57 / AK-57K

Front surface| 1 000 mm
Side surfaces| 500 mm
Back surfaces| 500 mm
Top surface| 1 200 mm **

• *) The safety clearance can be reduced by 50% when a single light protective screen is used and by 75% when a double light protective screen is used.
• **) The safety clearance can be reduced by 25% when a single light protective screen is used.
• 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 protective screen and the plate.
• A double protective screen can be made of two 7 mm thick non-combustible, fibre-reinforced cement plates or two metal plates with a minimum thickness of 1 mm. The plates are fastened with screws to the base and if required also with one another. An air gap of at least 30 mm must be left between the protective screen and the plate and also between both plates.

Fuel

• Dry and clean wood must be used as fuel. Both hardwood and softwood can be used to heat the sauna stove. Dry wood heats the sauna stove the best and ensures the best efficiency.
• Chipboard, fibreboard, painted and treated wood, waste and plastics are not allowed to be used as fuel.

Installation

GENERAL
No mortar should be applied for installing brickwork. The bricks must simply be placed carefully on one another. Before stacking stones in the sauna stove, all stones should be rinsed with water to remove dust. The sauna stove must be placed so that there is an air gap with a minimum size of 5 cm between the sauna stove and the firewall. Other safety clearances must meet the requirements stipulated in the part “Safety clearances” (page 3). Install the sauna stove into the level base.

Opening direction of the firebox
When installing the base, the opening direction of the firebox must be determined. Remember that once the flue is connected it should be possible to turn the top cover of the sauna stove as shown in the drawing below.

When the location of the sauna stove and the opening direction of the firebox have been determined, start assembly from the bottom.

Assembly of the bottom part

Install the bottom cover.  Assemble elements inside the bottom cover.

• A. Place the ash drawer base in its place, edges under the bottom elements

• B. Bottom elements (2 pcs)

• C. Grate

• E. Bottom side elements (2 pcs) and bottom back element

• A. Place the ash drawer base in its place, edges under the bottom elements.

• B. Bottom elements (2 pcs)

• C. Grate

• D. Front piece for grate

• E. Bottom side elements (2 pcs) and bottom back element

• F. Upper side elements (2 pcs) and the utmost back element

Assemble the bottom part of the sauna stove in the sequence described above. Remember to consider the opening direction of the firebox. Once all elements are assembled verify that the surface is level.

Bottom cover and valley elements

Install valley elements.
(AK-47: 2 pcs, AK-57 and AK-57K: 4 pcs)

Raising element (only for model AK-57K)

• A. Install the raising element (includes ready-installed insulation and a stainless steel inner layer).
  • Only for model AK-57K. When assembling a sauna stove AK-47 or AK-57, skip this part and continue with the next step.

Top cover

• A. Install the top cover (includes ready-installed insulation and a stainless steel inner layer).

Firebricks

• A. Firebricks must be laid in two layers. Lay the first layer of firebricks vertically along the edges. When the bricks do not fit well, cut one brick in half and make the bricklayer tight.
• B. Place the arches. Check that the arches are tightly in place and lay the sauna stove stones on the arches starting with bigger stones. The arches are included only in the ceramic stone package.

Stacking sauna stove stones

• 100 MM BALLS
  Place 100 mm balls in the bottom. Smaller balls may be used to support the edges of the structure.

• 80 MM BALLS
  Next place 80 mm balls. As the height increases, also continue with stacking the sauna stove stones.

• 60 MM BALLS
  Place 60 mm balls evenly on top of 80 mm balls.

• TETRA-STONES
  Lay small tetra-stones in the upper layer.

OLIVINE

• 20CM STONES
  Place over 20cm stones in the bottom.

• 12-20CM STONES
  Next place 12-20cm stones. As the height increases, also continue with stacking the firebricks.

• 7-12CM STONES
  Place 7-12cm stones last to the top.

  • The amount of stones is sufficient when some are left over. Not all stones should be placed in the sauna stove. Leave about 5cm of free space between stones and cast iron cover.
  • Do not complete the first layer fully before the first heating. During heating add stones in places that start glowing first. The first layer functions as an adjustment layer. To reduce excessive draught add stones in the first layer.
  • When the draught of the sauna stove is poor and heating takes very long, check whether the stones are not stuck too tightly. Wood that is moist or of poor quality also pro-longs the heating time.

In case of questions regarding the installation of sauna stove stones or arches, please contact us: NARVI Oy 020 741 6740

Cast iron lid and insulation wool

• A. Place the cast iron lid with the closing pans.
• B. Do not forget to place a piece of insulation wool included in the delivery on top of the cast iron lid.

Also, the space between the cast iron lid (edges) and sauna stove casing must be insulated with wool. This prevents the accumulation of soot on the upper part of the sauna stove and keeps heat better in the sauna stove.

Sheet metal cover and fastening of the connective flue

• A. As a next step install the enamel-lined sheet metal cover. Check that the insulation placed on top of the cast iron cover does not restrict the correct position of the sheet metal cover.
• B. Install the fastening of the connective flue.

Masonry connection and flue connection

Install the masonry connection (A) in the flue. The flue con-nection must be made according to the above drawing. Fasten the connective flue delivered with the sauna stove to the fastening of the connective flue with a tightening bracket so that the shorter end of the pipe always faces the sauna stove. Otherwise, the pipe will not reach the flue and also the height of the connective flue will not be the same as stated in the description.

Connective flue and tightening bracket

• A. Place the connective flue in the right place and tighten, it if needed.
• B. Connect the connective flue with the sauna stove with the tightening bracket.

A connective flue delivered with an Aito sauna stove can also be provided with enamel-lined extension pipes. Extensions: 500 mm or 1000 mm.

Steam hatch and ash drawer

• A. Install the steam hatch.
• B. Install the ash drawer.

Heating

First heating
Once the sauna stove has been installed, do the first heating which must be done at half capacity and thereafter allow the sauna stove to cool, so that the bricks and stones settle down. The first heating also removes any possible humidity from the bricks, which might increase the heating time of the sauna stove. If the upper stones do not become evenly hot, add small stones to the hot spots to get an even draught in the whole upper surface of the stone compartment.

Heating
Open the ash drawer 5 cm. See that a sufficient volume of combustion air enters the sauna either from the valve or through the door.

To ensure the correct travel path of smoke, open the valve in front of the closing plan, open the closing pan and close the valve in front of the closing pan as shown in the above drawing. Check that the flue is open. The heating time depends significantly on the wood quality. The fastest method to heat the sauna stove to the tem-perature suitable for steam procedures is to use finely cut birch wood that is dry. Fill the firebox with wood 2/3 part of the firebox height and light it from above. During burning the firebox hatch should be kept closed and the ash drawer opened. When more than half of the wood has been burned, continue refilling the firebox sufficiently often. Towards the end of heating the draught can be reduced with the help of the ash drawer.

Heating of the sauna             AK-47     AK-57     AK-57K

Start-up (kg)| 5| 6| 7
1. addition (kg)| 4| 5| 4
2. addition (kg)| 3| 3| 4
3. addition (kg)| –| –| 4
4. addition (kg)| –| –| 3
Sticks of firewood with a diameter of around 5 cm, length of around 33 cm and weight of around 0.5 kg

Heating is stopped when the lower parts of the upmost stones start glowing red. For the last fill of the firebox, we recommend using small firewood, which burns up quickly and does not leave coal glowing long. To prevent soot problems, the AITO sauna stove should always be heated so hot that the lower halves of the upper stones glow red.

When there are almost no embers left, push ash on the grate in the ash drawer. The ash drawer should be emptied. The ash must be emptied in a non-combustible container (for instance metal bucket). Now close the ash drawer, firebox hatch the closing pan and the valve in front of the closing pan. After this, the glowing redness spreads to the upper surfaces of the stones and the stones become free from soot. Let the sauna stove stay like this for a while so that heat will spread evenly in the area and the sauna stove is ready for the steam bath (“löyly”). Before starting enjoying your sauna throw the first “löyly”, which removes any ash dust on the stones and the next “löylys” will already be cleaner. The first “löyly” is thrown with the closing pan open and the valve in front of the closing pan closed. In this way, any ash on the stones is directed into the stack via the flue. After this, the sauna is ventilated.

If there is no ventilation valve in the upper part of the sauna, the sauna can, when necessary, be ventilated by closing the steam hatch and by opening the valve in front of the closing pan. In this case, the closing pan must be closed (see the drawing below). This method can also be used for drying the sauna after the bathing procedure.

Due to the risk of carbon monoxide, it is strictly forbidden to heat the heat- storing sauna stove additionally during the bathing procedure. If for some reason the sauna stove requires additional heating, the bathing procedure should be interrupted and the sauna stove should be heated once again. The bathing procedure can be continued only when there are no flames and embers left, the ash drawer has been emptied and the first “löyly” has been thrown according to the instructions.

• The sauna stove is ready for the bathing procedure when the first “löyly” has been thrown, the opening pan and the valve in front of the opening pan are closed and the steam hatch is open (see the above drawing).
• To start the bathing procedure open the steam hatch. Place the steam hatch in a non-combustible base, not in the wooden base. Throw “löyly” in small quantities. The mass of the sauna stove and the amount of stones guarantee long, soft and oxygen-rich steam for many hours.

Enjoy your sauna!

Cleaning and maintenance

General cleaning

• The sauna stove does not require any specific mainte-nance, the only procedures required are to empty the ash drawer and to ask the chimneysweep to clean the system. Removal of ash after each heating improves burning efficiency and prolongs the lifetime of the grate.
• For easy maintenance of the enamel-lined sauna stove clean it with water and a soft cloth.

Replacement of sauna stove stones

• The lifetime of ceramic sauna stove stones is significantly longer than that of natural stones. In addition, they also heat up much more quickly. Thereat we recommend using ceramic stones in the sauna stove.
• Yet the sauna stove stones should be periodically checked and friable stones should be replaced.
• When you are not going to use your sauna stove for a longer period, clean it from soot and ash. To facilitate drying, the steam hatch and firebox hatch should be left open.

Soot fire
IN CASE OF A SOOT FIRE (ALSO IF IT HAS ALREADY BEEN EXTINGUISHED) ALWAYS NOTIFY THE EMERGENCY CENTRE!

Warranty

Under consumer protection legislation Aito sau-na stove’s warranty period is two years. The warranty covers normal family use provided use, installation and maintenance meet the requirements stipulated in the instructions.
The warranty period starts from 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 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 in its 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 delivery. 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 product 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 stove. 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 quantity 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 stove.

Layout scheme of AK-47

Lay-out scheme AK-57 and AK-57K

AK-57 and AK-57K are generally the same, except the fact that model 57K is equipped with a raising element installed between the bottom and top cover.

Stone sets

AK-47 Ceramic stones

Stone

|

Package

| Per sauna stove
---|---|---
Ball 100 mm| 10 kg case| 10 kg
Ball 80 mm| 20 kg, white box| 20 kg
Ball 60 mm| 20 kg, white box| 20 kg
Small tetra-stones| 10 kg case| 10 kg
Arches| Package
AK-47 box with arches| On one side of the case:

”AK-47 arches and laying instruction”

IN TOTAL| 5 boxes| 60 kg

AK-57K Ceramic stones

Ball 100 mm

|

1 x 20 kg, white box

1 x 10 kg, white box

|

30 kg

Ball 80 mm

| 4 x 20 kg, white box|

80 kg

Ball 60 mm

| 1 x 20 kg, white box|

20 kg

Small tetra-stones| 1 x 10 kg, case| 10 kg
Arches| Package
AK-57

box with arches

| In the white box:

”AK-57 arches and laying instruction”

IN TOTAL| 8 boxes| 140 kg

AK-57 Ceramic stones

Stone

|

Package

| Per sauna stove
---|---|---

Ball 100 mm

| 1 x 20 kg, white box|

20 kg

Ball 80 mm

| 2 x 20 kg, white box|

40 kg

Ball 60 mm

| 1 x 20 kg, white box|

20 kg

Small tetra-stones| 1 x 10 kg, case| 10 kg
Arches| Package
AK-57

box with arches

| In the white box:

”AK-57 arches and laying instruction”

IN TOTAL| 6 boxes| 90 kg

Olivine stone sets

AK-47

|

AK-57

|

AK-57K

Product number|

5534

|

5535

|

5536

20 cm| 1 x 30 kg| 2 x 30 kg| 2 x 30 kg
12–20 cm| 2 x 20 kg| 3 x 20 kg| 6 x 20 kg
7–12 cm| 1 x 20 kg| 2 x 20 kg| 2 x 20 kg
IN TOTAL| 90 kg| 160 kg| 220 kg

Narvi Oy

• Yrittäjäntie 1 2 27230 Lappi, Finland
• Tel. +358 207 416 740
• www.narvi.fi.

References

• Narvi Oy - Puulämmitteiset kiukaat, sähkökiukaat, muuripadat, tulisijat

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