KASTOR KS-20, KS-20V, KS-27V Instructions Manual
KASTOR KS
(KS-20, KS-20V, KS-27V)
4211-61 Kastor KS 1 3/25/11
Rev. 1
KASTOR KS- series wood burning sauna stoves installation and usage manual (KS-20, KS-20V,
KS-27)
1. Before you install .................................................................................................................... 4
1.1. Package contents and its inspection ......................................................................................4
1.2. Important matters and regulations.........................................................................................4
2. Installation and preparation for use ...................................................................................... 4
2.1. Preparing for use and burn-in................................................................................................4
2.2. Stones and their arrangement ................................................................................................5
2.3. Stove base..............................................................................................................................5
2.4. Safety distances and protections ...........................................................................................6
2.5. Connecting the stove to a brick chimney and instructions for JK stoves..............................7
2.6. Connecting to a Kastor chimney ...........................................................................................8
2.7. The stove door and changing the opening direction .............................................................9
2.8. Air guide plate.......................................................................................................................9
2.9. General directions to prevent damage...................................................................................9
3. Using the stove...................................................................................................................... 10
3.1. Fuel......................................................................................................................................10
3.2. Adjusting the air flow..........................................................................................................10
3.3. Adjusting the heat output ....................................................................................................10
4. Maintenance........................................................................................................................... 11
4.1. Cleaning the stove ...............................................................................................................11
4.2. Ash removal ........................................................................................................................11
4.3. Sweeping .............................................................................................................................12
4.4. Removal and cleaning of the stove's glass ..........................................................................12
5. Troubleshooting .................................................................................................................... 12
6. Manufacturer identification .................................................................................................. 14
7. Pictures .................................................................................................................................. 14
4211-61 Kastor KS 2 3/25/11
Rev. 1
KASTOR KS- series wood burning sauna stoves
installation and usage manual
(KS-20, KS-20V, KS-27V)
Please save these instructions for later use!
Once the installation is done, this manual should be given to the sauna’s owner or the
person in charge of running it.
Please read these instructions prior to installation and first use!
KASTOR WOOD BURNING SAUNA STOVES
We thank you for your confidence in Kastor’s products. We have manufactured wood burning
sauna stoves for nearly a century now, longer than any other company in the world. Over these
years, we have learned a lot about fire, its handling and its precariousness. Anyone can light a
fire, but nurturing it is nearly a form of art. We have two guidelines in design and manufacturing:
A master’s touch leaves nothing extraneous and a master’s touch cannot be achieved with low
grade material. Our products are simple and reliable, although their elegant form is based on
solutions born from decades of experience and the latest technology.
QUALITY MATERIAL
Our products contain only the best possible material, procured from reliable suppliers we have
gathered over the years. The steel is Finnish structural steel from Ruukki, which can be bent into
various solutions while retaining its hardness due to its uniform quality. Our glass covers are
Ceram glass, which can withstand up to 800 °C (1472 °F) while still allowing the fire’s warm glow
to spread into the room.
WE KNOW FIRE
Our products are heavy, which by itself is a sign of fireproof construction. Still, it is not the steel’s
thickness but its correct use that is important. One needs to know how fire behaves. The hottest
and most stressed part is not necessarily directly above the fire, depending on how the heat is
being channelled. The fire must also be supplied with air to ensure optimally clean burning and
economical heating.
SUPERIOR TECHNOLOGY
Our stoves can be fully heated with just one load of wood and they retain warmth long after the
flame has died down. This unique property is the sum of many factors: High quality material, the
Coanda- air circulation system, the air guidance sheet, the large and deep stone compartments
and the sturdy doors. Read more about these and our other technical innovations as well as our
comprehensive installation supplies at www.kastor.fi or in our prospectus.
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Rev. 1
1. Before you install
Inspect both product and the contents of the package as soon as you receive them. Report any
transport damages to the deliverer.
1.1. Package contents and its inspection
The stove package contains:
x Stove
x Within the fire compartment
o Installation instructions
o Grate
o Air guide plate
o Connection pipe
o 2 adjustment legs
o Door handle, Attachment screws and washers
x Two steel caps (one on the foremost sweeping hole and another on the back wall flue
hole, which bolted into place with a screw driven through the intermediate mantle).
x Chimney enlarger to fit U.S. 6” stove pipe.
1.2. Important matters and regulations
During installation and use these instructions and all relevant official regulations must be
followed. The sauna stove must not be used for any other purposes such as drying clothes,
heavy heating during building etc. The stove must also never be covered in any way during use
or when it is warm.
Also check the following aspects and their influence on your choice of stove installation location:
o Safety distances to flammable and non-flammable structures (Chapter 2.3.
and 2.4.)
o Location of chimney connection (height from floor of any existing chimney
connection or installation route of any new chimney pipe)
o Floor material (flammable, non-flammable, tiled and waterproofed)
2. Installation and preparation for use
2.1. Preparing for use and burn-in
x Install door handle according to chapter 2.7.
x Place the stove outdoors on a non-flammable surface
o without stones
o tank, if any, filled with water
x Remove any decals and protective plastic sheeting.
x Check that the grate and air guide plate (see chapter 2.8.) are in place.
x Install the connection pipe delivered with the package into the backmost flue opening on
top of the sauna stove or the hole in the back wall. KS models: remove first the cap in the
mantle e.g. with a screwdriver and move the covering plate to the upper flue opening.
x In JK models the connection pipe is installed to the hole nearest the door on top of the
stove.
x Other openings are for sweeping; cover also them with a cap.
x Burn-in: The purpose of the burn-in is to remove out of doors any flammable protective
coating substances and to harden the stove’s coating. Burn a few full loads of wood in the
fire compartment. Continue the burn-in until there are no more fumes rising from the
stove.
x Once the stove has cooled down after the burn-in, move it into the sauna.
x See to it that the sauna is well ventilated during the first couple of heating.
4211-61 Kastor KS 4 3/25/11
Rev. 1
2.1.2 WATER TANK
Water tank cover
Lift off the water tank cover (remove protective plastic sheeting from the cover) and attach the
cover's handle knob with a screw in such a way that the knob is on the outside.
Water tank spout
To avoid damage during transport, the spout of the stove's water tank has been installed on the
inside. The delivery includes the spout, two gaskets and a nut. The spout should be attached on
the exterior of the water tank as follows (Picture 1):
x Lift water tank from its place.
x Place first gasket on the spout's winding.
x Push spout into hole in the stove's mantle.
x The second gasket is placed on the spout's winding on the inside of the mantle.
x Lift water tank into its place and set its hole on the winding part of the spout.
x Set the water tank's edge on the side support.
x Place the nut on the spout's windings inside the tank and tighten with suitable tool.
2.2. Stones and their arrangement
Use peridotite or dunite or darkish natural stones with diameters of over 10 cm. (4”) always wash
the stones before installing them. They must not be stacked too tight or heaped up – arrange
them so that plenty of air can pass between them to warm the upper stones, as well. Fill the
stone compartment up to the edge, with flat stones in upright positions (Picture 2.2.). The
maximum stone capacity is about 60kg. (132 lbs).
By adjusting stone size, amount and adding other types of stone you can balance the steam
consistency to suit the sauna and your preferences. Since these are highly individual, we cannot
give a general rule of thumb – you will find the right mix by trial and error.
For the stove’s proper functioning it is essential that the hot air circulates between the stones to
heat them quickly. If the stones are too small or improperly arranged, you will heat the sauna
instead of the stones!
2.3. Stove base
The stove must be installed horizontally, on a stable and unmoveable non-flammable or
fireproofed base. For this, you may either use a separately sold protective stove base (sold at
many hearth stores) or a concrete sheet with a minimum thickness of at least 60 mm (2 3\8”) with
a slight incline towards the back and a smooth surface.
The front corners of the stove are equipped with adjustment screws, with which it can be
straightened horizontally on an inclined. The adjustable legs are delivered in the equipment bag
in the stove’s fire compartment. Screw them into place and adjust as needed.
We do not recommend installing the stove directly on a tiled floor, as its moisture sealing, tile
glue etc. may contain components that are not heat resistant.
Fireproofing of the floor on flammable material:
400 mm (16”) in front of the stove
250 mm (10”) to the sides
4211-61 Kastor KS 5 3/25/11
Rev. 1
250 mm (10”) behind the stove
(Or, at the sides and back up to a fireproofed wall; picture 2.3.).
2.3.1. Installation on wooden floor with a cast concrete base
On a wooden floor we recommend installation on a 60 mm (2 3/8”) thick, smoothly cast concrete
slab, which rises towards the back, with risers to provide a ventilation slit between it and the floor.
The stove is then straightened by adjusting the legs.
ATTENTION! Always check the carrying capacity of the wooden floor, as the loaded stove
weighs more than 100 kg. (220 lbs).
2.3.2. Installation on tiled and waterproof floor
A protective stove base is sufficient, a separate fronting plate is not necessary. Protective bases
are available at most hearth stores.
2.4. Safety distances and protections
2.4.1. Safety distances
For stone walls, the safety distances are 50 mm (2”) from the stove’s outer surfaces, preferably
100 mm (4”) to achieve sufficient air circulation. This means the stove will fit a niche of stove
width + 200mm (8”) (i.e. for the KS 20 that is 19 5/8” + 7 7/8” = 27 3/16”).
The safety distance to any flammable materials is 500mm (20”) from the stove’s outer surfaces.
In front of the stove, due to heat radiation and the working and maintenance space needed,
1,000 mm ( 40” ) is a reasonable distance, but 500 mm (20”) is sufficient to ensure safety, if the
panel in front of it does not heat up beyond 85
o
C (185 °F) during the burn-in.
The safety distance upwards is 1,200 mm (48”), measured from the stove upper surface.
If the flue pipe starts off from the top of the stove with a non-insulated connection pipe, the
required safety distance is 1,000 mm (40”) in all directions and 1,200 mm (48”) above.
The safe distance between a fitted water tank and the nearest flammable material is 150 mm
(6”).
These safety distances can be reduced by using protectors according to instructions given below.
These will enable you to install the stove in a space just 1,100 mm (44”) wide (I.e. for KS 20, the
width needed is 490 mm (19 5\8” )+ 250 mm ( 10” ) = 740 mm ( 29 5\8” )).
2.4.2. Reduction of safety distances
The required safety distances at the back and sides can be reduced by 50% using a single layer
of protection and by 75% with a doubled layer. The protection can be either a 1 mm thick metal
sheet or 7 mm of fibre-reinforced cement board (not gypsum board coated with paper or similar).
(Picture 2.4.2.)
A ventilation space of 30 mm (1 ¼”) must be left between wall and protector. The protector must
be detached from floor and ceiling (likewise between the plates for doubled protectors). If the
sauna has a flammable floor in front of the stove, the area to be protected extends 100 mm (4”)
beyond the door’s sides and a minimum of 400 mm (16”) in front of it. In this case, the protection
must be at least a 1 mm (3/64”) thick metal sheet.
If the stove is installed with one side and the back against a brick wall, safety distances of 50 mm
(2”) to the side and 50 mm (2”) at the back are sufficient. If it stands with its back and both sides
next to brick wall, 100 mm (4”) should be left on both sides to ensure air circulation. At the back,
50 mm (2”) remains sufficient.
4211-61 Kastor KS 6 3/25/11
Rev. 1
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