Harvia PO10E User manual

20032023 / Y05-0914 B
PO10E, PO12E, PO15E
Instructions for Installation and Use of Electric Sauna Heater
PO15EPO10E, PO12E

CONTENTS
1. INSTRUCTIONS FOR USE.............................................. 3
1.1. Piling of the Sauna Stones.....................................3
1.1.1. Maintenance ............................................... 3
1.2. Heating of the Sauna ............................................ 3
1.3. Control Unit of Heater........................................... 3
1.4. Throwing Water on Heated Stones .........................4
1.5. Instructions for Bathing ........................................ 4
1.6. Warnings ............................................................ 4
1.6.1. Symbols descriptions.................................... 4
1.7. Troubleshooting ................................................... 4
2. SAUNA ROOM............................................................. 5
2.1. Sauna Room Structure .......................................... 5
2.1.1. Blackening of the Sauna Walls .......................6
2.2. Sauna Room Ventilation ........................................ 6
2.3. Heater Output...................................................... 6
2.4. Sauna Room Hygiene............................................ 6
3. INSTRUCTIONS FOR INSTALLATION .............................. 7
3.1. Before Installation ................................................ 7
3.2. Place and Safety Distances of the Heater ................7
3.3. Electrical Connections...........................................7
3.3.1. Installation of Control Unit and Sensor............ 8
3.3.2. Electric Heater Insulation Resistance...............8
3.4. Installing the Heater .............................................8
4. SPARE PARTS ........................................................... 10
These instructions for installation and use are
intended for the owner or the person in charge of
the sauna, as well as for the electrician in charge
of the electrical installation of the heater. After
completing the installation, the person in charge
of the installation should give these instructions to
the owner of the sauna or to the person in charge
of its operation. Please read the instructions for use
carefully before using the heater.
The heater is designed for the heating of a sauna
room to bathing temperature. It is not to be used
for any other purpose.
Congratulations on your choice!
Guarantee:
• The guarantee period for heaters and control
equipment used in saunas by families is two (2)
years.
• The guarantee period for heaters and control
equipment used in saunas by building residents
is one (1) year.
• The guarantee does not cover any faults
resulting from failure to comply with
installation, use or maintenance instructions.
• The guarantee does not cover any faults
resulting from the use of stones not
recommended by the heater manufacturer.
• The guarantee period for heaters and control
equipment used in saunas by institutions is
three (3) months.

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1. INSTRUCTIONS FOR USE
Figure 1. Piling of the sauna stones
1.1. Piling of the Sauna Stones
The piling of the stones is illustrated in figure 1.
PO10E, PO12E: You will need
• ca 40 kgs of small stones (diameter 5–10 cm)
• ca 80 kgs of large stones (diameter 10–15 cm).
PO15E: You will need
• ca 220 kgs of large stones (diameter 10–15 cm).
Wash off dust from the stones before piling them
into the heater.
1. Cover the heater body with stones completely.
Use stones that fit easily between the heater
body and the steel frame.
2. Place stones with suitable shape between and
around the heating elements. Do not wedge
stones between the heating elements. Pile the
stones so that they support each other instead
of lying their weight on the heating elements.
Place large stones against the steel frame.
Cover the heating elements with stones com-
pletely. A bare heating element can endanger
combustible materials even outside the safety
distances.
3. Fill the upper part of the steel frame with
stones. Place the stones loosely so that air can
flow between them. Do not form a high pile of
stones on top of the steel frame.
Note!
• Use solely angular split-face sauna stones that
are intended for use in a heater. Peridotite, oliv-
ine-dolerite and olivine are suitable stone types.
• Neither light, porous ceramic “stones“ nor soft
potstones should be used in the heater. They
do not absorb enough heat when warmed up.
This can result in damage in heating elements.
• Rounded stones should not be used in the heat-
er. They tend to pile too tightly and block the
air flow in the heater.
• The guarantee does not cover any faults
caused by the use of stones not recommended
by the manufacturer.
• No such objects or devices should be placed
inside the heater stone space or near the heater
that could change the amount or direction of
the air flowing through the heater.
1. 3.2.
PO10E
PO12E:
Ø 5–10 cm
1.1.1. Maintenance
Due to large variation in temperature, the sauna
stones disintegrate in use. Therefore, they should
be rearranged at least once a year or even more
often if the sauna is in frequent use. At the same
time, remove any pieces of stones from the bottom
of the heater and replace any disintegrated stones
with new ones.
The guarantee does not cover any faults caused
by disintegrated or too small stones blocking the air
flow in the heater.
1.2. Heating of the Sauna
When operating the heater for the first time, both the
heater and the stones emit smell. To remove the smell,
the sauna room needs to be efficiently ventilated.
If the heater output is suitable for the sauna room,
it will take about an hour for a properly insulated
sauna to reach the required bathing temperature (
2.3.). The sauna stones normally reach the bathing
temperature at the same time as the sauna room.
A suitable temperature for the sauna room is about
60–80 °C.
1.3. Control Unit of Heater
The PO heaters require a separate control unit to
operate the heater. The heaters can be controlled
with the following control units:
• CX45J
See the instructions for use of the selected control
unit model.
Before switching the heater on always check
that there isn’t anything on top of the heater
or inside the given safety distance. 1.6.

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1.4. Throwing Water on Heated Stones
The air in the sauna room becomes dry when warmed
up. Therefore, it is necessary to throw water on the
heated stones to reach a suitable level of humidity in
the sauna. The effect of heat and steam on people
varies – by experimenting, you can find the levels of
temperature and humidity that suit you best.
You can adjust the nature of the heat from soft to
sharp by throwing water either to the front of the
heater or straight on top of the stones.
Never throw water on the stones when there
are people near the heater, because hot steam
may burn their skin. The maximum volume of the
ladle is 0.2 litres. The water to be thrown on the
heated stones should meet the requirements of
clean household water (table 1). Only special aromas
designed for sauna water may be used. Follow the
instructions given on the package.
1.5. Instructions for Bathing
• Begin by washing yourself.
• Stay in the sauna for as long as you feel com-
fortable.
• Forget all your troubles and relax.
• According to established sauna conventions,
you must not disturb other bathers by speaking
in a loud voice.
• Do not force other bathers from the sauna by
throwing excessive amounts of water on the
stones.
• Cool your skin down as necessary. If you are in
good health, you can have a swim if a swim-
ming place or pool is available.
• Wash yourself after bathing.
• Rest for a while and let your pulse go back to
normal. Have a drink of fresh water or a soft
drink to bring your fluid balance back to normal.
1.6. Warnings
• Staying in the hot sauna for long periods of
time makes the body temperature rise, which
may be dangerous.
• Keep away from the heater when it is hot. The
stones and outer surface of the heater may
burn your skin.
• Keep children away from the heater.
• Do not let young, handicapped or ill people
bathe in the sauna on their own.
• Consult your doctor about any health-related
Table 1. Water quality requirements
limitations to bathing.
• Consult your child welfare clinic about taking
little babies to the sauna.
• Be very careful when moving in the sauna, as
the platform and floors may be slippery.
• Never go to a hot sauna if you have taken alco-
hol, strong medicines or narcotics.
• Never sleep in a hot sauna.
• Sea air and a humid climate may corrode the
metal surfaces of the heater.
• Do not hang clothes to dry in the sauna, as this
may cause a risk of fire. Excessive moisture content
may also cause damage to the electrical equipment.
1.6.1. Symbols descriptions
Read operators manual.
Do not cover.
1.7. Troubleshooting
All service operations must be done by profes-
sional maintenance personnel.
The heater does not heat.
• Check that the fuses to the heater are in good
condition.
• Check that the connection cable is connected
( 3.4.).
• Check that the control panel shows a higher
figure than the temperature of the sauna.
• Check that the overheat protector has not gone
off. ( 3.5.)
The sauna room heats slowly. The water thrown
on the sauna stones cools down the stones
quickly.
• Check that the fuses to the heater are in good
condition.
• Check that all heating elements glow when the
heater is on.
• Turn the temperature to a higher setting.
• Check that the heater output is sufficient (
2.3.).
• Check the sauna stones ( 1.1.). Too tightly
piled stones, the settling of stones with time
or wrong stone type can hinder the air flow
through the heater, which results in reduced
heating efficiency.
• Check that the sauna room ventilation has been
Water properties Effect Recommendation
Humus concentration Colour, taste, precipitates <12 mg/l
Iron concentration Colour, odour, taste, precipitates <0,2 mg/l
Manganese (Mn) concentration Colour, odour, taste, precipitates <0,10 mg/l
Hardness: most important substances
are magnesium (Mg) and lime, i.e.
calcium (Ca)
Precipitates Mg: <100 mg/l
Ca: <100 mg/l
Chloride-containing water Corrosion Cl: <100 mg/l
Chlorinated water Health risk Forbidden to use
Seawater Rapid corrosion Forbidden to use
Arsenic and radon concentration Health risk Forbidden to use

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arranged correctly ( 2.2.).
The sauna room heats quickly, but the
temperature of the stones remain insufficient.
Water thrown on the stones runs through.
• Check that the heater output is not too high
( 2.3.).
• Check that the sauna room ventilation has been
arranged correctly ( 2.2.).
Panel or other material near the heater blackens
quickly.
• Check that the requirements for safety
distances are fulfilled ( 3.2.).
• Check the sauna stones ( 1.1.). Too tightly
piled stones, the settling of stones with
time or wrong stone type can hinder the air
A
GC
E
F
D
A
B
Figure 2.
.
2.1. Sauna Room Structure
A. Insulation wool, thickness 50–100 mm. The
sauna room must be insulated carefully so that
the heater output can be kept moderately low.
B. Moisture protection, e.g. aluminium paper.
Place the glossy side of the paper towards the
sauna. Tape the seams with aluminium tape.
C. Vent gap of about 10 mm between the mois-
ture protection and panel (recommendation).
D. Low mass 12–16 mm thick panel board. Before
starting the panelling, check the electric wiring
and the reinforcements in the walls required by
the heater and benches.
E. Vent gap of about 3 mm between the wall and
ceiling panel.
flow through the heater, which may result in
overheating of surrounding materials.
• Check that no heating elements can be seen
behind the stones. If heating elements can be
seen, rearrange the stones so that the heating
elements are covered completely ( 1.1.).
• Also see section 2.1.1.
The heater emits smell.
• See section 1.2.
• The hot heater may emphasize odours mixed
in the air that are not, however, caused by the
sauna or the heater. Examples: paint, glue, oil,
seasoning.
F. The height of the sauna is usually 2100–2300 mm.
The minimum height depends on the heater (see
table 2). The space between the upper bench
and ceiling should not exceed 1200 mm.
G. Use floor coverings made of ceramic materials
and dark joint grouts. Particles disintegrating
from the sauna stones and impurities in the
sauna water may stain and/or damage sensitive
floor coverings.
NOTE! Check from the fire authorities which parts
of the firewall can be insulated. Flues which are in
use must not be insulated.
NOTE! Light protective covers which are installed
directly to the wall or ceiling may be a fire risk.
2. SAUNA ROOM

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D
B
min. 500 mm
min.
500 mm
min. 1000 mm
360°
180°
2.1.1. Blackening of the Sauna Walls
It is perfectly normal for the wooden surfaces of the
sauna room to blacken in time. The blackening may
be accelerated by
• sunlight
• heat from the heater
• protective agents on the walls (protective
agents have a poor heat resistance level)
• fine particles disintegrating from the sauna
stones which rise with the air flow.
2.2. Sauna Room Ventilation
The air in the sauna room should change six times
per hour. Figure 3 illustrates different sauna room
ventilation options.
A. Supply air vent location. If mechanical exhaust
ventilation is used, place the supply air vent
above the heater. If gravity exhaust ventilation
is used, place the supply air vent below or next
to the heater. The diameter of the supply air
pipe must be 50–100 mm. Do not place the
supply air vent so that the air flow cools the
temperature sensor ( 3.3.1.)!
B. Exhaust air vent. Place the exhaust air vent
near the floor, as far away from the heater as
possible. The diameter of the exhaust air pipe
should be twice the diameter of the supply air
pipe.
C. Optional vent for drying (closed during heating
and bathing). The sauna can also be dried by
leaving the door open after bathing.
D. If the exhaust air vent is in the washroom, the
gap underneath the sauna door must be at
least 100 mm. Mechanical exhaust ventilation
is mandatory.
2.3. Heater Output
When the walls and ceiling are covered with panels
and insulation behind the panels is adequate, the heat-
er output is defined according to the volume of the
sauna. Non-insulated walls (brick, glass block, glass,
concrete, tile, etc.) increase the need for heater out-
put. Add 1,2 m³ to the volume of the sauna for each
non-insulated wall square meter. For example, a 10 m³
sauna room with a glass door equals the output re-
quirement of about a 12 m³ sauna room. If the sauna
room has log walls, multiply the sauna's volume by
1,5. Choose the correct heater output from table 2.
Figure 3.
2.4. Sauna Room Hygiene
Bench towels should be used during bathing to pre-
vent sweat from getting onto the benches.
The benches, walls and floor of the sauna should
be washed thoroughly at least every six months.
Use a scrubbing brush and sauna detergent.
Wipe dust and dirt from the heater with a damp
cloth. Remove lime stains from the heater using a
10% citric acid solution and rinse.

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3. INSTRUCTIONS FOR INSTALLATION
Table 2. Installation details
3.1. Before Installation
Before installing the heater, study the instructions
for installation. Check the following points:
• Is the output and type of the heater suitable for
the sauna room? The cubic volumes given in
table 2 should be followed.
• The location is suitable for the heater (see
item 3.2. “Place and Safety Distances of the
Heater”).
• Is the supply voltage suitable for the heater?
• Are there a sufficient number of high quality
sauna stones?
3.2. Place and Safety Distances of the Heater
The minimum safety distances are described in fig. 4.
• It is absolutely necessary to install the heater
according to these values. Neglecting them
causes a risk of fire.
• Hot pieces of stone can damage floor coverings
and cause a risk of fire. The floor coverings of
the installation place should be heat-resistant.
• The heater should be installed so that the
warning texts on the cover of the junction
box can be read without difficulty after the
installation.
Figure 4. Safety distances (all dimensions in millimeters)
Heater Output Dimensions Sauna room
Diameter Height Weight Stones Cubic vol. Height
kW
2.3.
mm mm kg kg
min.
m3
max.
m3
min.
mm
PO10E 10,0 530 740 30 120 9 20 1900
PO12E 12,5 530 740 30 120 14 24 2100
PO15E 15,0 600 830 33 220 16 35 2100
PO10E: min. 100
PO12E: min. 150
PO15E: min. 150
min.
100
PO10E min. 1160 PO12E: min. 1360 PO15E: min 1270
3.3. Electrical Connections
The heater may only be connected to the
electrical network in accordance with the cur-
rent regulations by an authorised, profession-
al electrician.
• The heater is semi-stationarily connected to the
junction box (figure 5) on the sauna wall. The
junction box must be splash-proof, and its max-
imum height from the floor must not exceed
500 mm.
• The connection cable (figure 5: C) must be of
rubber cable type H07RN-F or its equivalent.
NOTE! Due to thermal embrittlement, the use
of PVC-insulated wire as the connection cable
of the heater is forbidden.
• If the connection and installation cables are
higher than 1000 mm from the floor in the sau-
na or inside the sauna room walls, they must
be able to endure a minimum temperature of
170 °C when loaded (for example, SSJ). Elec-
trical equipment installed higher than 1000 mm
from the sauna floor must be approved for use
in a temperature of 125 °C (marking T125).
• The wiring diagrams are included in the control
unit’s installation instruction.
• Further instructions concerning exceptional
installations can be obtained from local electri-
cal authorities.

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3.3.1.
min. 500
Junction box
4x2,5 mm² (SSJ)
Figure 5. Electrical connections
3.3.1. Installation of Control Unit and Sensor
Install the sensor as shown in figure 6. Detailed
instructions for the installation of both the unit and
the sensor are delivered with the control unit.
The sensor must be installed exactly in the
specified place. Otherwise the heater may not
function properly.
The supply air vent of the sauna room must
not be located near the temperature sensor.
The air flow near an air vent cools down the sensor,
which gives inaccurate temperature readings to the
control unit. As a result, the heater might overheat.
The air vent’s minimum distance from the sensor
(figure 6):
• omnidirectional air vent: 1000 mm
• air vent directed away from the sensor: 500 mm
The sensor must be installed to the place defined in
these instructions (figure 6). If the minimum distance
is not fulfilled, ventilation must be changed.
3.3.2. Electric Heater Insulation Resistance
When performing the final inspection of the electrical
installations, a “leakage” may be detected when
measuring the heater’s insulation resistance. The
The heater’s electrical connections
Heater Output Fuses [A]200 VAC
3-Phase
PO10E 10,0 3x30
PO12E 12,5 3x40
PO15E 15,0 3x45
reason for this is that the insulating material of the
heating elements has absorbed moisture from the
air (storage/transport). After operating the heater
for a few times, the moisture will be removed from
the heating elements.
Do not connect the power feed for the heater
through the RCD (residual current device)!
3.4. Installing the Heater
See figure 7.
1. Connect the connection cable to the heater
(see item 3.3. “Electrical Connections”).
2. Place the heater body. Adjust the body
vertically straight with the adjustable legs.
3. Place the steel frame. Adjust the frame
vertically straight with the adjustable legs
(PO15E only).

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A
A
B
C
360°
180°
Option 1:
Sensor (installed on ceiling)
Option 2:
Sensor (installed on wall)
min.
500
min. 1 000
Figure 6. Installing the Temperature Sensor (all dimensions in millimeters)
A min.- max. B min. - max. C
PO10E / PO12E 100-150 100-200 100
PO15E 200-300 150-300 100
Figure 7. Installing the heater
1. 2. 3.

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4. SPARE PARTS
6
5
4
3
2
1
HEATER HEATING ELEMENT OUTPUT PART NO.
PO10E 1-6 1640W / 208V ZSS-120
PO12E 1-6 2050W / 208V ZSP-250I
PO15E 1-6 3000W / 208V ZSP-255I
We recommend to use only the manufacturer’s spare parts.

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