vilpra GRANNUS VPR-8 Wood Burning Sauna stove User Manual
- June 3, 2024
- vilpra
Table of Contents
vilpra GRANNUS VPR-8 Wood Burning Sauna stove User Manual
Welcome to Vilpra Sauna!
We congratulate you on your selection and welcome you to the growing user base
of Vilpra Sauna stoves. We have done our best regarding quality, elegance, and
technique so that our products will live up to your expectations. Please
carefully familiarise yourself with these instructions before the installation
and operation of the stove. Correct installation and operation help to utilise
all the features of the Vilpra Sauna stove enjoyably and safely, and also
assures the longevity of the stove. We wish you pleasant sauna moments!
Contents of the package
- Sauna stove
- Ashpan
- Protective glove
- Chimney connection pipe L-0,33 m, Ø 115 mm
- Installation and operation manual
Technical information
Table: 1
| Grannus VPR-8
---|---
Volume of the sauna room. m3| 6-10
Bottom grate| mild steel
Number of flue outlets| 1
Flue socket diameter. mm| 115
Required temperature class of chimney| T600
Height. mm| 600
Width. mm| 440
Depht. mm| 510
Weight without stones, kg| 23
Load of stones. kg| 30-40
Size of stones. cm| 05-10
Water tank volume. I| –
Maximum length of wood logs. cm| 25
Max refuelling at a time. kg| 2.
Combustion air setting| Ashpan 10 mm opened
Declaration of performance (DoP)
Table 2
Installation instructions
Sauna stove shall be installed and operated in accordance with the national
legislation and the requirements set out in this manual. If requirements in
national legislation and this manual vary, it is necessary to follow the more
stringent requirements.
Sauna stove is intended for heating a sauna. The sauna stove must not be
modified without the manufacturer’s consent.
Before installation
Suitability of the stove for the sauna
Check the suitability of the stove for the sauna, refer to the minimum and
maximum volume of the sauna room (Table 1). The heating of the sauna room
depends on the volume and wall materials of the sauna and the heat output of
the stove. Please note, that non-insulated wall materials like bricks, tiles,
concrete, and glass increase the heat output requirements of the stove. To
ensure sufficient heat output, for every non-insulated wall surface (glass,
concrete, rock) 2 m3 must be added to the volume of the sauna during the
calculation. If the sauna walls are made of solid timber, the volume of the
sauna room in cubic meters is multiplied by 1.5.
Initial heating of stove outside
The frame of the Vilpra Sauna stove has been painted with heat-resistant
paint. During the initial heating, the painted surfaces of the stove may smoke
and give off harmful substances. Because of this, we recommend that the stove
is heated outside for the first time. If heating outside is not possible,
ensure efficient ventilation of the sauna room during the initial heating to
reduce odours and harmful fumes. The initial heating is always done without
stones, and a metal tube must be installed on the chimney flue prior to
heating (minimum 2 m) so that the draft needed for burning is created. During
the initial heating, 1 to 2 loads of wood should be burned; thus, the
=corrosion-protective preservatives are removed from the surfaces of the
stove.
The heat-resistant paint of the stove reaches its final hardness only during
the initial heating. Prior to this, rubbing and wiping of painted surfaces
must be avoided and caution must be followed while moving and treating the
stove.
The stove may cause smells of paint in the sauna room, which will, however,
disappear within a short period of time.
Ventilation of wood-burning sauna
Efficient ventilation of the sauna room is a requirement for an enjoyable
sauna moment. Traditional ventilation may be deployed by having the air supply
to the floor level near the stove and by installing an exhaust valve to the
ceiling level, as far as possible away from the stove. The stove itself
circulates the air efficiently, in which case the exhaust valve is only needed
mainly to remove moisture after sauna.
The air supply air fed to the floor level moves between the hot inside part
and the mantle of the stove. The heated air rises through the stove and heats
the sauna room. Because the burning wood needs plenty of air, the fireplace
forms a suction that causes circulation with the rising draught in the sauna
room.
Protection and safety distances of structures
Safety distances and functionality of installation location
When situating the stove, the safety distances from the sauna structures must
be considered for the sake of preventing fires and operational safety. The
minimum safety distances between the stove and combustible materials are
defined during the tests according to EN 15821:2010 (see Table 2). Sufficient
working space around the stove enhances the ease of operation. We recommend at
least 1000 mm width and depth of free working space around the stove. The
stove must always be situated a sufficient distance from combustible and
sensitive materials. In wall niches, sufficient ventilation space must be
allowed from all walls and at least 125 mm distance between non-combustible
materials and the stove.
Note! Electric appliances or wires may not be situated within the safety
distances of the stove
During installation, the below-mentioned safety distances to wooden walls, sauna benches, and other combustible materials must be complied with.
-
The distance between vertical surfaces of the stove and unprotected wooden structures must be at least 200 mm (see Picture 1).
-
The safety distance mentioned above may be reduced by up to 100 mm with single light protection (see Picture 2). Single light protection is, for example, a non-combustible fibre reinforced cement slab with a thickness of at least 7 mm or sheet metal of at least 1 mm that has been attached to the wall with sufficient density. A ventilation gap of at least 30 mm must be left between the protected wooden surface and the protective plate.
-
When installing , a ventilation gap of at least 50 mm must be kept near masonry or other stone structured walls between vertical surfaces and the walls of the stove (see Picture 3). Measurement A of Picture 3 is chosen according to the protection method of the wooden surfaces:
Without protection| 200 mm
---|---
Single light protection| 100 mm
Protection structures must not touch the floor or ceiling
For this purpose, a Vilpra Sauna protection for wood stove as an accessory is available for purchase at a Vilpra Sauna merchant.
- In the protection of sidewalls, masonry is an option for sheet structures. An equivalent of the single light protection may be deployed using masonry with a thickness of 55 mm (see Picture 4). The masonry must be open at the sides and at least 30 mm away from the protected surface. In addition, it must reach at least 600 mm higher than the upper surface of the stove and must fulfil the safety distance directive of 200 mm in a lateral direction.
Protection of Roof
Separate protection for the roof is not needed if the distance between the upper surface of the stove and the ceiling (distance F as shown in the Picture 5) is equal or higher to 1200 mm (see Table 2). If the distance is less than mentioned above, valid fire directives must be complied with. If needed, contact the fire department of your residential area.
Protection of floor
Items 1-4 (above) does not apply to the floor in front of the stove if the
structure of the floor has been deployed with non-combustible materials. The
floor must be protected with a metal sheet which is placed tightly against the
floor and stove. The protection located at the front of the stove must reach
at least 100 mm to either sides of the stove door and 400 mm to the front of
the door, (see Picture 6).
Valid national fire directives must be complied with. If needed, contact the
fire department of your residential area.
Protection of walls
The inside walls of the sauna must be protected if the wooden walls in the
vicinity of the stove are closer than the permitted safety distances, and
the walls are made of combustible materials like panels, planks, or timber.
For details of protection, see item 2 above. Protection of sidewalls.
It is typical for all wooden surfaces of the sauna room to darken over time –
vast changes in temperature speed up the darkening. Darkening may occur in a
short time in a wood preservative-treated wood surface above the stove as many
wood preservatives are more vulnerable to higher temperatures than untreated
wood.
The fine-grained materials released from the stone parts of the stove may also
darken the wooden surface near the stove. By following this installation and
operation manual of the stove it will ensure that the stove does not heat the
surfaces of the sauna room to a dangerously hot level.
The highest permitted temperature for the wall and ceiling surfaces is +145
°C. When choosing the surface material, it is recommended to consider that all
non-insulated glass and stone surfaces increase the power demand requirements
of the stove (see section 1).
Platform of stove
The stove must be placed on a stable, sturdy non-combustible floor platform. The foundation and floor structure must withstand the weight of the stove and prevent an excessive increase in temperature in the structures surrounding the stove. When there is a wooden floor in the sauna room, a concrete slab with a thickness of 50 mm or Vilpra Sauna Protection under the wood stove must be used. A tiled floor must, if needed, be protected before the installation of the stove. For this purpose, a Vilpra Sauna Protection under the wood stove as an accessory is available for purchase at a Vilpra Sauna merchant.
Installation of Stove
External tank for water heating
An external tank for water heating may be installed on wood-burning stoves
(see Picture 7 and Picture 11). The Vilpra Sauna external tank for water
heating is an accessory that is available for purchase at a Vilpra Sauna
merchant.
Stove connection to a chimney
For connection of stove to a chimney follow the safety distances and
protection requirements in the Protection and safety distances of
structures. T600 temperature class connecting flue pipes, flue liners or
double wall insulated chimneys must be used. L-0,33 m, Ø 115 mm chimney
connection pipe by which the stoveis connected to the chimney flue is included
in the stove package. The diameter of the chimney shall not be smaller than
flue socket diameter of the stove, it is optimal when diameters are equal. The
stove is not suitable for installation in a shared flue system. Follow
installation instructions of chimney products. The connection of the sauna
stove to the chimney and chimney installation must be made by a qualified
installer. For the best performance, installation of a damper is recommended.
We recommend using Vilpra connecting flue pipes, flue liners or double wall
DW50-M Sauna insulated chimney products. Chimney installation examples are
presented in Pictures 7, 9 to 12. The gap between the masonry chimney flue and
the connection pipe must be insulated with a fireproof material like mineral
wool.
Changing of the opening direction of the door
The opening direction of the stove door may be altered following steps from 1
to 4 (see Picture 8).
Sauna stones
Ensure that the stove is levelled, and all the adjustable legs are firmly on
the floor before inserting sauna stones. Attention should be paid to the
choice of the sauna stones. We recommend stones that are of consistent quality
and which both properly and safely fit for usage on the stoves. If needed, the
stone dust must be washed away from the sauna stones prior to placing them on
the stove. Place large stones on the bottom of the stone space in a way that
air circulates between the stones. The small stones are placed on the top
because they absorb heat efficiently, even when further away from the heat
source. The number of stones, together with the temperature of the sauna,
affect the moisture of the sauna. A larger amount of stones and a lower sauna
temperature produce more moisture in the sauna.
Note! Do not use ceramics or stones collected from the wild due to
possible erosion, decomposition and harmful compounds.
Stove connection to a masonry chimney with a flue liner
Stove connection to a double wall Vilpra DW50-MSauna chimney (T600
temperature class)
- Combustible material
- Non-combustible material
- Single wall metal connecting flue pipe
- Double wall Vilpra DW50-M Sauna chimney (T600 temperature class
Stove connection to a double wall Vilpra DW50-MSauna chimney (T600
temperature class) with external Vilpra Sauna tank for water heating
- Combustible material
- Non-combustible material
- Single wall metal connecting flue pipe
- Double wall Vilpra DW50-M Sauna chimney (T600 temperature class)
Safety distances
- Combustible material
- Non-combustible material
- Single wall metal connecting flue pipe
Usage of stove
Sauna stove shall be operated in accordance with the national legislation and the requirements set out in this manual. If requirements in national legislation and this manual vary, it is necessary to follow the more stringent requirements.
Fuels
Use only dry natural wood logs as a fuel. Maximum refuelling loads and length
of wood logs are given in Table 1 and Table 2. The stove must not be stacked
full of wood, avoid overheating the sauna stove. Wood logs must not be stored
next to the stove, pay attention to the safety distances.
Heating the stove
Note! Clean the stove bottom grate and empty the ashpan each time prior
to heating the sauna.
Note! Do not heat the stove in a way that the flue pipe glows red, the
stove overloads and it shortens the lifespan of the stove.
Note! Parts of the stove, especially the external surfaces, will be hot
to touch when in operation and due care is needed to be taken. Use protective
glove, which is included in the package of the stove, for safe manipulation of
the stove.
Note! Do not heat the stove without stones, except initial heating of
stove outside.
Set the first load of wood loosely by placing the biggest firewood on the
bottom and the smaller ones on the top into the firebox, add kindling between
the wood logs and light them. Add the actual refuelling loads when the fire
has nearly burned down to embers.
The firebox shall be kept closed except during ignition, refuelling and
removal of residue material to prevent fume spillage. Combustion air is
brought into firebox and it is regulated with sliding ashpan. Combustion air
settings are given in Table 1. The stove has been designed to perform in most
efficient way when the draught in the flue is as given in Table 2. When the
chimney is too long or diameter is too big, this optimal draught limit may be
exceeded. The draught may be adjusted by sliding ashpan or using a damper in
case it is installed. A continuous excessive draught will shorten
the lifespan of the stove, as the stove overloads, and the stove becomes red-
hot.
After using the sauna, it is recommended to keep a small fire going in the
stove to remove moisture from the surfaces of the sauna. In case of sootfire
in the chimney: 1. Slowly close the ashpan and stove door; 2. Contact local
fire authority; 3. Do not try to extinguish fire using water; 4. After a
sootfire, the chimney and the stove must be checked by the chimney sweeper
before use.
Sauna Water
Clean, fresh water is suitable to be used as sauna water. Ensure that the
water is always of sufficient quality: excessive salt, calcium, iron, and
sediments cause corrosion and shorten the lifespan of the stove significantly.
Ferrous water may form rust-like spots on the surface of the stove.
Remove the spots by using a stainless steel detergent.
Note! Usage of sea water as sauna water is prohibited. The warranty for
the Vilpra Sauna stove does not cover damages resulting from usage of poor-
quality sauna water.
Sanitation of Environment of Stove
The stone and metal parts of the stove contain natural features that impact
the cleanliness and need for sanitation in the sauna space. It is typical for
the sauna stones to deteriorate over time. Fine granular material may also
separate from the steatite that washes away with the sauna water. The
smouldering of the furnace and heat of the stove may also separate minerals
and metaldust. Due to the reasons mentioned above, white and light materials
should be kept away from the stove. It also must be ensured that tiling and
floor surfaces can endure abrasive materials, high temperature variations, and
have sufficient sanitation. The characteristics mentioned above are features,
not defects, and therefore are not covered by the warranty and liability for
damages of the manufacturer.
Maintenance of Stove
The chimney of the stove collects soot and ash over time, which must be
removed if needed. Local regulations for chimney sweeping shall be met. It is
typical for sauna stones to disintegrate slowly. Therefore, they must be
stacked again once a year, or more often if the sauna is used multiple times a
week. Simultaneously, stone debris collected in the stone space is removed,
and crumbled stones are replaced with undamaged ones.
To retain a good draught, the chimney must be swept regularly. The ashpan must
be emptied each time prior to heatingbn of the sauna so that the combustion
air through the ashpan cools down the grating, and so ensures a long lifespan.
It is recommended to keep a separate ash container for the ash.
Note! The removed ash may contain burning embers, so store the ash
container a sufficient distance from sensitive and combustible materials! It
is recommended to wipe the clear and brushed steel surfaces of the stove with
a multi-purpose cleaner to prevent calcium stripes and rust-like spot
Vilpra Sauna Checklist
- Installation of stove and connection to a chimney:
- Only use chimney elements designed for this purpose.
- The metal chimney must not just lean on the stove. Attach the metal chimney to the sauna structures.
- The stove must only be connected to a suitable chimney.
- When installing the stove, sufficient distance to structures must be arranged, to ensure free sweeping of the stove.
- Initial heating: Smoke and odours
- The initial heating of the stove is done without stones, preferably outside (using a metal pipe 2 meters in height) or in a sauna room that has sufficient ventilation. During initial heating, 1 to 2 loads of wood should be burned.
- Ensure that every adjustable leg rests firmly on the floor prior to loading the sauna stones.
- Sauna stones: Only use suitable washed sauna stones for the purpose. Load the stones again once a year and more often if the sauna is heated for long periods of time or multiple times a week.
- If the side hoods and back of the stove heat up excessively:
- Check the chimney joints.
- When heating the stove, a suitable amount of wood must be used in the stove. The stove must not be loaded full of wood – a suitable amount: not more than 1.9 kg of dry wood at a time and not more than 3,8 kg/h.
- The ashpan must be emptied, and the grating cleaned each time prior to heating of the sauna.
- Sauna water: Preferably, use only clean, fresh drinking water.
- If the sauna is left cold in the winter:
- Remove the stones from the stove.
- Clean the stone space and grating.
- Empty the ashpan and water tank.
- Fire safety:
- Ensure the safe installation of the stove by reviewing the latest instructions from the local fire authority prior to installing.
- Regularly clean the stove, flue gas connector and the chimney flue and check for blockage prior to re-lighting after a prolonged shut down period.
- It is recommended for regular maintenance by a competent engineer.
Warranty
Vilpra sauna stoves have a manufacturer’s warranty of 36 month after the date of purchase. The warranty cover manufacturing defects. Damages caused by incorrect use or use which is not in accordance with instructions are not covered by the warranty
For safety
- Prior to installing the stove, review the up-to-date safety distances and directives.
- The sauna may not be used to dry clothes or as a room to dry laundry.
- Beware of the hot stove as the stones and metal parts heat up and become burning hot. Beware of steam rising from the stove, to prevent burns.
- We recommend supervision of children, disabled and sick people while using the sauna. Move carefully in the sauna as the benches and floor may be slippery.
- Do not enter the sauna under the influence of alcohol, drugs, or intoxicating agents.
- Please note that insufficiently loaded stone space creates a fire risk.
- Never cover the stove.
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