MONDEX Tahko 6.6 User manual

12/2022
INSTALLATION AND
OPERATING INSTRUCTIONS
Tahko M, E2 and O Types

Installation and Operating Instructions Tahko
2
Contents
1 General safety instructions 3
2 Tahko heater M and E2 types 4
3 Heater assembly and installation 4
Stacking the stones 5
4 Technical specifications 6
Heater power and voltage 6
Heater dimensions 6
Required amount of stones 6
Minimum distances to inflammable material 7
5 General instructions for users of Tahko heaters 8
Note 8
Installation cable 8
Additional connection options 8
6 Things to keep in mind when using the heater 8
First heating 8
Sauna room 8
Temperature control 8
Heating time 8
Water thrown on heater 8
Sauna room construction 9
7 Wiring diagram M type 9
8 Time switch and thermostat operation M type 10
Additional connection options 10
9 Installation instructions E2 type 11
Installation of controller and sensor 12
10 Wiring diagram E2 type 13
Controller card wiring, heater 13
Controller card wiring, controller 13
11 Heater control and operation, type E2 14
Switching on the heater 14
Starting the heating process 14
Timing of the heating process 14
Starting the heating 14
Stopping the heating or timing process 15
Quick start of the heating process 15
Parental control 15
Error codes 15
12 Heater control and operation, O type 16
13 Troubleshooting 17
Heater does not heat up 17
Warnings 17
Warranty 17
Maintenance, spare parts 17
Natural stone as a material 17
Changing the heater stones 17
14 Service history 18

Installation and Operating Instructions Tahko
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This device may be used by children who are 8 years of age or older, as well as by persons whose
physical, sensory or mental abilities have deteriorated or who lack of experience and knowledge, only
under supervision or when they have been instructed on the safe use of the device and they understand
the hazards associated with using the device.
This device complies with the requirements of:
Mondex pursues an active policy of product development and continuous improvement. For this
reason, Mondex reserves the right to make changes relating to the design and technical specifications
of their products without prior notice.
1. General safety information
Electrical connections may only be made by an electrician with a valid installation authorisation
according to the current regulations.
The Mondex electric heater is suitable for use in a family sauna, one (1) heater per sauna room.
Retain the installation and operating instructions for further reference.
Always check the adequacy of the fire protection distances!
Failure to observe the connection instructions may cause a fire hazard!
Always check the sauna room before switching the heater on!
Always check that the controller has switched the heater off after the set time period!
Due to the risk of fire, do not use the sauna to dry clothes or laundry.
Exercise caution with a hot heater, since the heater stones and metal parts become very
hot and can cause burns.
Steam from the heater is burning hot and may cause severe burns.
Children, disabled and ill persons who are using the sauna should be supervised.
Children may not play with the device.
A child must not carry out any cleaning or maintenance unattended.
Benches and floors may be slippery, therefore move in the sauna with caution.
Do not go to a hot sauna under the influence of narcotic substances
(alcohol, drugs, narcotics, etc.).
A stone compartment without stones or filled improperly will present a risk of fire!
Covering the heater will present a risk of fire.
To ensure safe use of the sauna, please read these safety instructions first!

Installation and Operating Instructions Tahko
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2. Tahko heater models
M type heater Heater type E2
+
Heater assembly
1) Keep the heater in its original package in an upright position in a warm
and dry location until it is installed.
2) The package includes the heater, as well as for type E2, the thermostat
sensor, electronic controller and required cables. Inspect the heater
components visually. If you notice any discrepancies, please contact the
store from which you purchased the heater. Do not expose heater parts
to blows and denting when taking it out of the package. The sauna’s
floor surface should also be properly protected before you begin the
installation.
3) An electrician should connect the wires before the heater is installed. If
the heater is to be embedded in the bench structure, it must be lowered
through the benches before making the electrical connections. If needed,
the position of the heater can be fine-tuned by using the adjustable legs.
The legs must be opened by at least 30 mm. Observe the safety distances
between the heater and any inflammable material in accordance with
table 4.4 on page 7.
4) Place the heater on the floor and adjust the legs so that the heater stands
straight.
Note! Remove all plastic film before using the heater.
3. Heater assembly and installation

Installation and Operating Instructions Tahko
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Stacking the stones
Note! Use conventional sauna heater stones with rough cutting surfaces. Suitable stone materials
include peridotite, olivine diabase, and olivine. The use of ceramic “stones” and soft soapstone objects
is forbidden. It may damage the heating resistors.
The recommended size of the stone for the Tahko heaters 6,6 kW and 9,0 kW is Ø 5-10 cm (4 boxes á
20 kg). The recommended sizes for the stones for the Tahko 10,5 kW heater are Ø 5-10 cm (5 boxes á
20 kg) and Ø 10-15 cm (2 boxes á 20 kg). Place the bigger stones on the bottom of the heater and in the
middle of the the resistances to ensure a sufficient air circulation.
Rinse any dust off of the heater stones before stacking them in the heater. Use protective gloves.
Stack the stones so that the resistors remain upright and straight. Do not bend the resistors so that
they are in contact with the metal structures of the heater. You want to stack the stones along the
heater’s outer frame as tightly as possible and leave more space between the inner stones.
A wall of tightly stacked stones prevents thermal radiation from overheating the materials around the
heater.
The more loosely stacked inner stones let air flow through the heater, heating the stones and,
subsequently, the sauna room effectively.
Stacking the heater stones
1) Place the stones into the stone compartment carefully – do not drop them. Do not wedge stones
tightly between the resistors.
2) Begin stacking the stones from the centre, on the inside of the resistors.
3) When stacking stones on the inside of the resistors, ensure that the stones are not stacked too
tightly. Stacking them too tightly will cause the resistors to bend and touch each other or the heater
frame.
4) Do not place any objects or devices in or near the heater’s stone compartment which would alter
the air flow through the heater.
5) An exposed, hot resistor may cause materials even outside the heater’s safety distances to become
dangerously hot. Note! Ensure that the resistors do not touch the heater’s frame anywhere. There
must always be a stone between a resistor and the frame.
Note! Do not remove the bands around the resistors. If there are two bands, one of them is located at
approximately 20 cm from the bottom and another approximately 10–15 cm from the top. These keep
the resistors apart from each other and prevent premature deterioration.
Do not make a heap of stones on top of the heater!
Do not use the heater without the stones!
Dents caused by the user or others are not covered by Mondex’s warranty or other product liability.
When stacking the stones, be careful not to dent the heater’s metal surfaces to avoid damaging them.
For more information on the warranty and replacing stones, see page 17.

Installation and Operating Instructions Tahko
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4. Technical specifications
Heater Tahko 6.6 Tahko 9.0 Tahko 10.5
Power kW 6.6 9.0 10.5
Voltage 400 V 3N 400 V 3N 400 V 3N
Connecting cable 5 x 1,5 mm² 5 x 2,5 mm² 5 x 2,5 mm²
Fuse 3 x 10 A 3 x 16 A 3 x 16 A
Sauna size 6–9 m38–15 m312–22 m3
Table 4.1
Amount of stones
Type Stone amount (kg)
Tahko 6.6 80
Tahko 9.0 80
Tahko 10.5 140
Table 4.3
Heater dimensions (mm)
Type Diameter Height
Tahko 6.6 320 850
Tahko 9.0 320 850
Tahko 10.5 370 1100
Table 4.2

Installation and Operating Instructions Tahko
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Minimum distances to inflammable material (mm)
D
Table 4.4 Minimum distances to inflammable material (mm)
Type A B C D Volume
Tahko 6.6 100 100 770 1900 6–9 m³
Tahko 9.0 120 120 770 1900 8-15 m³
Tahko 10.5 120 120 900 2000 12-22 m³
AA B B
C

Installation and Operating Instructions Tahko
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5. General instructions for users of Tahko heaters
6. Things to keep in mind when using the heater
First heating
During the first heating, the resistors may emit fumes. Therefore, ensure that the room is properly
ventilated.
Sauna room
Always check the sauna room before switching the heater on! Always make sure that the timer has
switched the power off after the set time period!
Temperature control
The temperature is adjusted by means of either a mechanical thermostat (see page 10: M types) or the
control panel (see page 14: E2 types). The actual heating time depends on the dimensions, structure
and thermal insulation of the sauna. The temperature in the sauna room can be maintained at the
desired level with the thermostat. If the temperature of the sauna room becomes dangerously high for
any reason, the overheating protector will switch the heater’s power off. The cause of overheating must
always be investigated. The power can be switched on again by pressing the overheating protector
reset button (see page 10: M types and page 14: E2 types).
Heating time
An excessive heating time consumes energy and does not improve the steaming properties. The best
steam is achieved by keeping the sauna’s heating time relatively short, at about 30–60 min., according
to the size of the sauna and the heater’s power. The size of the sauna, the glass door, windows, or
materials used may require a longer heating time.
Water thrown onto the heater
We recommend using hand warm water. The water should be fresh household water. Throwing the
water onto the heater sides / lower stones generates softer steam. If you want steam that feels hotter
and more intense, pour plenty of warm water on top of the heater all at once. Do not use sea water or
chlorinated water.
Note
Electrical connections may only be made by an electrician with a valid installation authorisation
according to the current regulations. The Tahko electric heater is suitable for use in a family sauna,
one (1) heater per sauna room. Retain the installation and operating instructions for further reference.
Installation cable
Use rubber cable H07RN-F as a connection cable.
Additional connection options
Control of electric heating with the heater: The electric heating control cable is brought directly
to the heater’s junction box and further to the heater’s terminal block with a rubber cable that is
dimensionally identical to the incoming cable.
NOTE! Failure to observe the connection instructions may cause a fire hazard!
NOTE! Remove all plastic film before using the heater!

Installation and Operating Instructions Tahko
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Heating control
Indicator “Heater on”
7. Wiring diagram M type
Sauna room structure
The sauna and its ceiling, in particular, should have good thermal insulation, as heat tends to escape
through the ceiling. Due to the moisture, we recommend that you use aluminium paper. The size of the
heater should be selected according to the size of the sauna (in cubic metres). In addition to calculating
the power need for the regular sauna structure (glass wool–foil–wood), the following should be taken
into consideration.
If the sauna has any uninsulated wood, tile or concrete surfaces or the walls are made of logs, the
heater power needs to be increased. For every uninsulated square metre, the heater power need
increases by the same amount as if increasing the space volume by 1.2 m3 and on timber surfaces by
1.5 m3. The factor for glass surfaces (glass walls, doors and uninsulated stone surfaces) is also 1.2 m3
per square metre. In borderline cases, you should choose a heater with higher power.
The sauna needs efficient ventilation for a good oxygen level and a sufficient amount of fresh air.
The air in the sauna needs to change at least 6 times per hour. For a sauna with an electric heater,
mechanical ventilation is the most convenient ventilation method. The supply air should be provided
through an inlet located 500 mm, at a minimum, above the heater, either on the wall or in the ceiling.
NOTE: the distance of an undirected inlet air valve from the temperature sensor must be at least 1,000
mm, while the distance of an inlet air valve directed away from the sensor must be at least 500 mm.
The exhaust valve should be placed on the opposite wall, as far away from the heater and as close to
the floor level as possible. It is highly recommendable to install an exhaust air valve in the ceiling as
well for an easier removal of moisture after sauna sessions.
For more information, refer to the construction instructions and building regulations.

Installation and Operating Instructions Tahko
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The time switch (4+8 h) is also the heater’s main switch. After a set time, the time switch automatically
switches the heater off. With the timer function, the heater can be set to switch on in 1–8 hours. The
maximum warm-up time is 4 hours.
For example:
If you want the sauna to be ready as soon as possible, set the time switch between 1 and 4. The
heater switches on immediately and begins to warm up. Set the desired temperature by turning the
thermostat.
If you want the sauna to be ready in three hours, turn the timer to 2 on the time switch scale of 1–8.
The timer starts and the power will be switched on and the heater will start warming up after two
hours. When the power has been switched on, the heater will remain on for a maximum of 4 hours.
After that, the power will be switched off automatically. You can switch the power off sooner by turning
the time switch to zero (0).
Always make sure that the time switch has switched the power off after the set time period!
8. Time switch and thermostat operation M type
Time switch
Overheat protector reset
switch
Thermostat
Additional connection options
Connecting a signal light outside the sauna room
The connection cable used should be, for example, the H07RN-F cable with a cross-sectional area the
same as that of the connection cable.
Control of electric heating with the heater
The electric heating control cable is brought directly to the heater’s junction box and further to the
heater’s terminal block with a rubber cable that is dimensionally identical to the incoming cable.