NARVI 30 Series Operating instructions

GB
Made by NARVI Oy Finland
Narvi 30, Narvi 50
Installation, user and maintenance instructions
version 1.0

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1.1 Technical data 4
2. Before you install the sauna heater 5
2.1 Steam room 5
2.2 Substrate 5
2.3 Safety clearances 5
2.4 Smoke ue 5
2.5 Ventilation 6
3. Installation and preheating
of the sauna heater 7
3.1 Preheating 7
3.2 Connection with the smoke ue 7
3.3 Changing of the opening direction
of the rebox door 7
3.4 Sauna heater stones 7
3.5 Installation of a tunnel sauna heater 8
4. Using the sauna heater 9
4.1 Firewood 9
4.2 Heating 9
4.3 Steam water 10
4.4 Removing the ashes 10
4.5 Maintenance of the sauna heater 10
4.6 Disposal 10
5. Soot fire 11
6. Frequently Asked Questions 11
7. Warranty 11
GB Content

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Narvi 30, Narvi 50
Introduction
Thank you for having chosen a Narvi 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 manual 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 sufcient knowl-
edge, if you are not allowed to use a sauna because of
your health condition or you are under the inuence 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
Narvi 30 50
Height (mm) 950 1100
Adjustment range ± (mm) 0 0
Width (mm) 535 670
Depth (mm) 670 850
Diameter of the connective flue (mm) 119 145
Distance of the bottom edge of the connecti-
ve flue from the floor (mm) 710 1740**
Weight (without stones, kg) 150 275
Weight of the stones, 10–15 cm (kg) 65 100
Size of the steam room (m³) 20–30* 45–70
Thickness of the cover of the furnace (mm) 10 15
Length of firewood (max mm) 500 650
*Suitable also in a bigger sauna (max 35 m3).
**Connection to the stack from the top of the heater, 60° connection pipe included.

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2. 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 reboxes 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 nal 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 rebox must be installed on the oor with sufcient
load-bearing capacity. The durability of the oor must be
checked especially carefully, when the sauna heater is in-
stalled on a wooden oor. The weight of the sauna heater
is shown in clause 1.1.
CONCRETE FLOOR
The sauna heater may be installed directly on a concrete
oor, which is at least 50 mm thick. If underoor 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 oor, moisture barrier and un-
deroor 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 re 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. Please observe the stipulated re-
quirements regarding walls, oors, sauna benches, other
inventories and storage areas of rewood!
*The minimum recommended sauna height is 2 300 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 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, bre-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 sufciently 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 oor 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 oor 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 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 30 Narvi 50
Structure Safety clearance
Top surface 1250* mm 1250 mm
Front surface 500** mm 1000 mm
Side surface 350 mm 500 mm
Back surface 350 mm 500 mm

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Please observe that the safety clearance of an uninsu-
lated smoke ue from structures made of combustible
materials is 1000 mm or any other distance stipulated in
the manufacturer’s instructions.
2.3.2 Non-combustible structure
If the wall is masonry or other structure classied as non-
combustible, it is sufcient to have a 50 mm air gap be-
tween the upright surfaces and the wall.
2.4 Smoke flue
A smoke ue of the sauna heater must meet the require-
ments of class T600 irrelevant of the material of the smoke
ue. The minimum recommended draft of the smoke ue
is 12 Pa.
A modular smoke ue must meet the requirements of class
T600 and provided with CE-marking. When installing a
modular smoke ue safety clearances stipulated in the in-
stallation manual of the smoke ue shall be followed. The
minimum recommended diameter of a modular smoke ue
is 120 mm. The weight of the smoke ue must not cause
load on the sauna heater. The sauna heater should be con-
nected to a separate smoke ue. A smoke ue made of
bricks must be at least the so-called half-brick smoke ue.
2.5 Ventilation
Ventilation of the steam room should be sufciently efcient
and should function so that fresh incoming air is routed as
close to the sauna heater as possible. Also proper air cir-
culation 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cient gap).
Extraction fans working in the same room as the rebox
may cause problems. Incoming air inlets should be located
so that they do not get blocked (for instance because of
snow). A rebox needs combustion air in a volume of 6–10
m3 per kilo of red 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.

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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 lms 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 during preheating. 1-2 reboxes of wood
are sufcient 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 rst heating. The paint of the sauna heater will achieve
sufcient strength only after the rst heating. Do not create
steam during the rst heating.
3.2 Connection with the stack
The sauna heater can be connected to the smoke ue 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 ue connection pipe, which can be used to
connect the sauna heater’s smoke ue from the back. If the
connection with the smoke ue is done from the above, a
Kota connective ue or Kota smoke ue must be used. In
case of connection from the above, a Kota smoke ue tank
for heating water or a Kota stone basket can be installed
around the connective ue.
Do not push the connective ue too deep in the smoke ue,
because this would hinder the draft. Any leaks in the con-
nective ue also reduce the draft; therefore the connections
must be sealed with reproof 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 ue and the sauna heater must be 25 mm. The
diameter of the connective ue of the sauna heater and the
height from the oor are shown in clause 1.1.
Please take into account the clearance distance of the
modular smoke ue, see the manufacturer’s instructions.
3.3 Changing of the opening direction of the
firebox door
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 installed 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
atnose pliers.
3.4 Sauna heater stones
We recommend that you use Kota olive dolerite stones.
Natural stones are not suitable to be used as sauna heater
stones 10–15 cm. Before using the stones, they must be
washed 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. Flat stones shall be stacked in
upright position. 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. The use of
stones with a regular shape (rectangular, etc.) and light or
ceramic stones is forbidden because of a risk of too tight
stacking.
3.5 Installation of a tunnel sauna heater
A wall between the heating room and sauna heater must
be made of non-combustible material, for example bricks.
Figure 7.

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Figure 8. The dimension A is determined based on the
safety method used for wooden surfaces. For additional
information see clause 2.3.
Measures of a tunnel opening:
Y mm X mm
Narvi 30 570 390
Narvi 50 590 390
X
180
Y
Narvi
Figure 9. Installation of a tunnel sauna heater.
For sealing brickwork and tunnel part we recommend the
use of a mineral wool slab, which provides moving space
required for thermal expansion. A tunnel model is connect-
ed to the stack from the top of the sauna heater.
In connection with the sauna heater installation, ensure
that the heater stands rmly on its base and that all of the
safety clearances mentioned in these instructions have
been observed correctly.
PROTECTION OF THE FLOOR IN FRONT OF THE SAUNA HEATER
Floors made of inammable material must be protected
with a metal plate that reaches at least 100 mm to both
sides of the sauna heater and 400 mm in front.
Figure 8.
Figure 9.

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4. Using the sauna
heater
4.1 Firewood
Both hardwood and softwood can be used to heat the
sauna heater. The use of chipboard, breboard, painted
or impregnated wood, waste or plastic is prohibited. To
ensure clean burning and the largest possible efciency,
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 ring!
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 re grate are clean and if the sauna
heater is provided with a water tank, that it is lled with
clean water. Check if there is sufcient draft in the smoke
ue. If you hesitate regarding the draft, check it by burning
a small quantity of water in the rebox rst. During heating
the door of the rebox must be closed and the water tank
must be lled with water. The sauna heater must not be
covered with anything.
To start heating pile rewood over a sufciently wide area
and ignite it from above. For ignition you may use birch
bark or paper. Ignition aid should be placed between the
upper rewood and it can be topped with some thinner
wood sticks or rewood (see drawing 9). Igniting from
above reduces pollution and ensures cleaner burning.
The power of the sauna heater can be regulated by the ash
drawer. If the ash drawer is closed, the power of the sauna
heater is at its lowest and the burning time is longer. 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 better in the sauna heater, stones can
store heat and you do not just heat up the ue. A calm
ame is a sign of a correct draft. Avoid heating the sauna
heater so that the channels of the stone compartment glow
red for a long time because this will overload the rebox
and the service life of the sauna heater will be reduced.
Overheating may also cause excessive heating of the
smoke ue and cause a re hazard. The connective ue
pipe must not be glowing red.
Figure 10. Properly stacked rewood.
The following table shows the recommended quantities
of rewood 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 present-
ed in the table. Maximum quantity of firewood per hour
(max kg/h) indicated in the table must not be exceeded.
Do not stack rewood in the rebox over 2/3 of its height.
Quantities of rewood 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 rewood should
not be burnt in the front part of the rebox / in the exten-
sion, but the rewood must be placed entirely on the grate
of the rebox.
Heating of the sauna:
Figure 10.
* Sticks of rewood with a diameter around 5 cm, length
around 33 cm and weight around 0.5 kg.
Narvi 30
1. firebox of firewood *
quantity of rewood (kg) 8
opening of the ash drawer (mm) 30 (stopper)
1. addition
quantity of rewood (kg) 5
opening of the ash drawer (mm) 30 (stopper)
max kg/h 10

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Do not forget that the sauna heater and its part be-
come 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.
One rebox of rewood burns approximately half an hour. A
good time for adding rewood is when there are still some
blue ames on the coal in the rebox. Before adding re-
wood you may even slightly smooth coal on the grate. If
rewood is added in the ames too early, the temperature
of fume gases increases. Do not use the door to push re-
wood in the rebox.
In case the sauna is used or the sauna heater is heated also
after the recommended number of times rewood should
be added as shown in the table, rewood should not be
added according to the quantities mentioned in the table. A
proper quantity for keeping heat is 1-2 logs (approximately
1 kg of rewood) every half an hour. The ash drawer may be
closed a bit. If you add a big quantity of rewood, the tem-
perature of ue gases rises and this can damage the smoke
ue and cause a re hazard. But do not heat continuously
over 3 hours. Thereafter, the sauna heater 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 ame, 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 rebox. 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 smoke ue for
a longer period or it is cold, please check before use that
the smoke ue 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 rewood so that not to
damage the smoke ue.
4.3 Steam water
Use normal domestic water for steam water.
Quality requirements for domestic water:
humus content < 12 mg/l
iron content < 0.2 mg/l
calcium content < 100 mg/l
manganese content < 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 heater
does not cover damages caused by the use of unsuitable
steam water. Do not throw water on the stones, if you your-
self 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 ll more than half of the drawer. Otherwise,
the airow through the rebox 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 ue 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 Maintenance of the sauna heater
Besides removing the ashes and having the chimney annu-
ally cleaned by a chimneysweep, the sauna heater requires
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 insufcient 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 ll 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
recycling centre.

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5. Soot fire
IN CASE OF SOOT FIRE (ALSO IF IT
HAS ALREADY BEEN EXTINGUISHED)
ALWAYS INFORM THE EMERGENCY
CENTRE!
!
If you detect soot re in the smoke ue, close the ash
drawer and the door of the rebox immediately. After soot
re and before the next use of the sauna let a chimney
sweeper check the condition of the smoke ue and the
sauna heater.
6. Frequently Asked
Questions
The sauna heater is drafting poorly
• The sauna heater has not been used in a long time; the
smoke ue and sauna heater are damp.
• The sauna heater is not receiving sufcient air; there is
a downdraft in the sauna caused by ventilation.
• The sauna heater has not been cleaned in a long time.
• The ash drawer is closed or full of ashes.
• Leakage in the connective ue.
The sauna does not heat up properly
• The rewood is damp.
• The sauna heater has insufcient power.
• The sauna heater or smoke ue is drafting poorly.
• The stones of the sauna heater are dirty or crumbling or
stacked too tightly.
• There are too many stones or there are too many small
stones.
The sauna heater smells
• The sauna heater has not been properly heated the rst
time it was done.
• The stones of the sauna heater were not washed before
loading.
• Fat or other dirt has accumulated on the stones.
• Steam water is not clean.
7. Warranty
Pursuant to consumer protection legislation Narvi sau-
na heater’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 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
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 re safety reg-
ulations can result in a re or damage to the sauna heater.
More detailed information about the re 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 rewood burnt in the rebox, 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.

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NARVI Oy reserves the right to any changes to technical details.
Narvi Oy
12
EN 15821:2010
Multi-ring sauna stoves red by natural wood logs
for space heating in residential buildings
Narvi 30
Fire safety (initiation, risk to adjacent
elements)
Pass
- including declared safety
distances to combustible
materials:
Emission of combustible products
Durability
Surface temperature
Release of dangerous substances
Cleanability
Flue gas temperature
Mechanical resistance
Thermal output and
Energy efficiency, as:
- carbon monoxide emission at 13 % O
- total eciency
- ue draught
- refuelling loads
- thermal output
(i.e. nominal space heating output)
Back
Side
Ceiling
300 mm
300 mm
1 200 mm
Pass
Pass
NPD
Pass
Pass (0,30 %)
Pass (70 %)
17 Pa
24 kW
8 kg + 5 kg
Pass
Pass
387 C