EOS Mega User manual

Druck-Nr.: 2902 5230
Stand: 34/23
EN
Made in Germany
EOS Mega / Mega HD
Heater for Sauna Cabins
Installation and Operating Instructions

EN-2 Installation and Operating Instructions - EOS Mega / Mega HD
Documentation
EN
Documentation
Manufacturer
Original installation instructions EN
Copyright for these installation instructions remains with
EOS Saunatechnik GmbH.
Copyright as per DIN ISO 16016:
The copying and distribution of this document, as well as the use and com-
munication of its contents without express authorisation, are not permit-
ted. Compensation will be claimed in the event of infringements.
All rights reserved with regard to patent claims or submission of design or
utility patent.
Characters, symbols and illustrations
EOS Saunatechnik GmbH
Schneiderstriesch 1
35759 Driedorf, Germany
Tel. [phone]
Fax [phone]
Email servicecent[email protected]
Web www.eos-sauna.com
Additional information about an operating step
Cross-reference to a page
Read instructions
Result of a step
Table title
Title of figure
≤ ≥ Less than or equal to, greater than or equal to

EOS Mega / Mega HD - Installation and Operating Instructions EN-3
Documentation
Revision history
Date Version Description
21 Aug. 2023 03.10 Safety instructions and standard texts updated
9 Jan. 2023 03.00 Switch to HD version
15 Aug. 2021 02.00 Technical enhancement to HD version
10 Sept. 2020 01.20 Circuit diagrams updated and information on heating time limitations added
9 Apr. 2020 01.10 Safety-related information added
27 Jan. 2020 01.00 First version

EN-4 Installation and Operating Instructions - EOS Mega / Mega HD
EN
Contents
Documentation ..................................................................................................EN-2
1 General safety instructions ..........................................................................EN-6
1.1 Mounting and electrical installation .................................................EN-6
1.2 Operator instruction................................................................................EN-8
1.3 Safety levels.............................................................................................EN-10
1.4 Standards and regulations.................................................................EN-10
2 Identification....................................................................................................EN-11
2.1 Requirements for operation .............................................................EN-11
2.2 Nameplate ...............................................................................................EN-11
2.3 Scope of delivery ...................................................................................EN-12
2.4 Accessories (optional).......................................................................... EN-12
2.5 Technical data.........................................................................................EN-13
2.6 Intended use ...........................................................................................EN-14
3 Installation ........................................................................................................EN-16
3.1 Specifications for the cabin ...............................................................EN-16
3.1.1 Installation site ......................................................................EN-17
3.1.2 Air inlets and outlets ............................................................EN-18
3.1.3 Connecting cables ................................................................EN-20
3.2 Temperature sensor .............................................................................EN-21
3.3 Mounting the sauna heater...............................................................EN-22
4 Electrical installation....................................................................................EN-26
4.1 General instructions for electrical installation ............................EN-26
4.2 Connection diagram ............................................................................EN-27
4.3 Internal wiring .......................................................................................EN-28
4.4 Establishing an electrical connection ............................................EN-33
4.5 Heating period limitation...................................................................EN-37
5 Commissioning ...............................................................................................EN-38
5.1 Filling rock stores with stones ..........................................................EN-39
5.2 Starting the heater................................................................................EN-40
5.3 Switching the heater on remotely ..................................................EN-40
5.4 Water splash............................................................................................ EN-41
6 Service and maintenance...........................................................................EN-42
6.1 Cleaning....................................................................................................EN-42
6.2 Sauna stones...........................................................................................EN-43
6.3 Replacing the tubular heating elements......................................EN-44
6.4 Troubleshooting....................................................................................EN-47

EOS Mega / Mega HD - Installation and Operating Instructions EN-5
7 General terms and conditions of service ........................................... EN-48
8 Disposal .............................................................................................................. EN-51

1
EN-6 Installation and Operating Instructions - EOS Mega / Mega HD
General safety instructions
EN
General safety instructions
1.1 Mounting and electrical installation
These installation instructions are intended for qualified person-
nel familiar with the laws and regulations applicable to electrical
installations at the installation site. Observe the following general
safety instructions during mounting, configuration and commis-
sioning of the product.
Risk to life and limb
and risk of fire
Risk to life and limb from electric shock and fire in the event of im-
proper or faulty electrical connection. This risk remains also after
completion of the installation work.
The electrical installation of the heater, power extension units
and other electrical systems or equipment with a fixed mains
connection must only be performed by a trained electrician
from an authorised electrical company.
Ensure compliance with the applicable standards and regula-
tions for electrical installation.
The system must be completely disconnected from the mains
supply before commencing installation and repair work.
The housing cover must only be removed by a trained special-
ist.
Fire hazard from
overheating
Insufficient ventilation can lead to device overheating and fire.
Install air inlets and outlets in the cabin.
Observe the cabin manufacturer’s safety and installation in-
structions.
Risk of fire due to
sauna stones
It is possible for hot stones or stone pieces to fall out of the rock
store.
The sauna heater may not be placed on a floor made of easily
flammable material (e.g. laminate or synthetic flooring). Ceram-
ic tiles are recommended as a flooring option.

EOS Mega / Mega HD - Installation and Operating Instructions EN-7
General safety instructions
Risk of burns from
hot glass
Glass surfaces in the cabin become hot while the sauna is in oper-
ation.
When installing the cabin, ensure that the touchable glass sur-
faces on the outside of the cabin may reach a maximum tem-
perature of 76°C. Appropriate protection may need to be
installed if required.
Risk of burns from
hot unit
During operation, the sauna heater may become hot and, if
touched, could cause burns.
Maintain a safe distance.
Sauna cabin and
sauna heater
The sauna cabin must be constructed with proper material and
built in a professional manner, and the output of the heater must
be suited for the cabin.
The sauna heater may only be used in sauna cabins made of
suitable, low-resin and untreated material (e.g. Nordic spruce).
The control unit must not be used in the cabin.
Multiple heaters may be installed in one sauna if the heater out-
put can properly supply the cabin volume. In this case, depend-
ing on the position, an additional safety temperature limiter
must be installed for each additional heater.
The sauna heater is not designed to be installed or set up in an
alcove or under a bench or sloping roof unless this sauna heater
is specifically designed and approved for this type of installa-
tion.
Receptacles may not be installed inside the sauna cabin.
Each sauna cabin must have air inlets and outlets. The air inlets
and outlets may be installed from below or from behind the
heater. The minimum dimensions of the air inlets and outlets
can be found here: 2.5 Technical data, EN-13 and 3.1.2 Air in-
lets and outlets, EN-18.
The air outlet is always installed in the lower part of the wall, di-
agonal to the heater. The air inlets and outlets must not be
closed. Observe the instructions provided by your sauna cabin
manufacturer.
Use the supplied control unit to check and control the sauna
heater. It is fixed to a suitable location on the cabin's external
wall, and the corresponding sensors according to the installa-
tion instructions for the control unit inside the sauna cabin.
Electrical installations and equipment in the sauna cabin must
comply with IEC 60364-7-703 (DIN VDE 0100-703).

EN-8 Installation and Operating Instructions - EOS Mega / Mega HD
General safety instructions
EN
The cabin lighting must be safe for sauna cabin use and in-
stalled in such a way that it can be used safely in a sauna cabin.
Ensure that the heater is installed in compliance with the stand-
ards and legal norms valid in your country.
The cabin door must open outward and must not have a lock
that cannot be opened in the case of failure. We recommend
magnetic or spring locks.
The door opening should be > 80 cm.
1.2 Operator instruction
The operator of the sauna cabin must be instructed in the general
safety instructions during commissioning. The operator must be
given a copy of the operating instructions.
Risk of electric shock A risk to life and limb from electric shock and fire arises in the event
of improper repair work. This risk remains also after work is com-
pleted.
The housing cover must only be removed by a trained special-
ist.
Repairs and installations must only be performed by a trained
specialist.
The system must be disconnected and removed entirely from
the mains supply before commencing repair work.
Use only original spare parts from the manufacturer.
Fire hazard Objects placed on the heater can easily be ignited and cause fires.
Do not place objects on the heater.
Fill the rock store as directed.
Inspect the sauna cabin prior to each commissioning.
If you operate the sauna heater using pre-set timers or a remote
control, install a suitable safety system.
Health risks Spending time in a sauna cabin can lead to serious health risks or
even death for persons with health impairments.
Persons with health impairments who spend time in a sauna
must consult a doctor before entering a sauna cabin.

EOS Mega / Mega HD - Installation and Operating Instructions EN-9
General safety instructions
Equipment damage
due to overuse
If the cabin is used commercially, the heating period must be set
so that the heater switches off automatically after a specific period
of time.
If the heating does not switch off automatically after a defined
heating period, cabin use must be supervised at all times.
Inspect the cabin before each use.
Damage to health Excessive time spent in a heated sauna cabin can lead to overheat-
ing of the body (hyperthermia), which may cause serious health
problems and even death. Hyperthermia occurs when the core
temperature of the body exceeds the norm by a few degrees.
Symptoms of hyperthermia include fever, dizziness, lethargy,
sleepiness, and fainting. Side effects of hyperthermia include per-
ception disorders, inability to recognize the need to leave the
room, inability to identify imminent danger, harm to the foetus in
the case of pregnant women, inability to physically leave the room
and unconsciousness.
Alcohol, drugs, and medications increase the risk of hyperthermia.
Do not exceed the maximum recommended time in the sauna.
Leave the sauna cabin if your body responds abnormally to the
heat or if you do not feel well.
Avoid alcohol, drugs, and medications when you are using the
sauna.
Operation by
children or persons
with reduced mental
capacity
This unit should not be used by children or persons with reduced
mental capacity or limited physical or sensory abilities.
Children must be supervised to ensure they do not play with
the unit.
Children and persons who have not received proper instruction
must not clean or service the system.

EN-10 Installation and Operating Instructions - EOS Mega / Mega HD
General safety instructions
EN
1.3 Safety levels
Safety instructions and important operating instructions are classified
according to ANSI Z535.6. Please familiarise yourself with the following
terms and symbols:
WARNING
Warning
Indicates a hazardous situation which, if not avoided, could result
in death or serious injury.
CAUTION
Caution
Indicates a hazardous situation which, if not avoided, could result
in minor or moderate injury.
NOTICE
Notice
Indicates a hazardous situation which, if not avoided, will result in
damage to the unit.
1.4 Standards and regulations
For an overview of the standards that were observed during design and
construction of the sauna heater, please refer to the individual product’s
technical data sheet that can be downloaded from www.eos-sauna.com.

2
EOS Mega / Mega HD - Installation and Operating Instructions EN-11
Identification
Identification
EOS Mega HD is an electrically heated sauna heater for Finnish mode
available in a variety of output capacities.
2.1 Requirements for operation
The heater must be operated together with one control unit and two
power extension units. They are not included in the scope of delivery.
The heater can be operated with one of the following control units:
EmoStyle series
EmoTec series
EmoTouch series
Econ series (Econ D2 and higher)
EOS Compact series
The power extension units required depend on the output capacity of the
heater. See 2.5 Technical data, EN-13
2.2 Nameplate
A Name
B Model
C Item number
D Electrical connection
E Country of origin
F Manufacturer
G Heater output
H Manufacturing date
I Serial number
Elektro-Saunaofen
Type EOS Mega HD XXX
Art. Nr. 94 XXXX 00
400V 3N ~ 50 Hz XX kW
Made in Germany 00002S-No. 41.22
EOS SAUNATECHNIK GmbH, Schneiderstriesch 1, 35759 Driedorf
IPX4
A
B
C
E
F
H I
D
G

EN-12 Installation and Operating Instructions - EOS Mega / Mega HD
Identification
EN
2.3 Scope of delivery
Check the unit upon delivery to ensure that all components were delivered
and
that it is in proper working order. Contact your distributor if components
are missing or damaged. The unit must not be operated if components are
missing or damaged.
The following parts are included in the scope of delivery:
2.4 Accessories (optional)
A heater guard rail may be mounted around the upper edge of the heater.
It prevents accidental contact with hot parts of the heater. The heater
guard rail consists of four brackets and a wooden frame.
CAUTION
Skin burns from hot surfaces
If the heater is placed too close to a bench, there is risk of acciden-
tal contact with hot surfaces. This could lead to burns.
The optional heater guard rail does not offer sufficient protection
in this specific installation configuration.
Increase the distance.
During the installation, mount a suitable heater guard rail for
the heater.
A Sauna heater B Installation instructions
AB

EOS Mega / Mega HD - Installation and Operating Instructions EN-13
Identification
2.5 Technical data
All line cross-section specifications are the minimum cross-sections of a
copper line.
Accessories Item no.
Sauna stones, 20 kg, caliber 100–150 mm 94.7340
Brackets for heater guard rail 94.7183
Brackets and wooden frame (abachi) 94.7184
Brackets and wooden frame (walnut) 94.7185
Heater output 42 kW 48 kW 54 kW 60 kW 72 kW
Unit dimensions HxWxD in cm 100 x 120 x 80
For sauna cabin size 55–70 m370–80 m380–100 m3100–130 m3130–160 m3
Minimum size
Air inlets and outlets 50 x 12 cm 60 x 12 cm 70 x 12 cm 70 x 12 cm 80 x 12 cm
Weight without rocks ~112 kg ~114 kg ~116 kg ~118 kg ~120 kg
Stone filling ~ 120 kg, caliber 100–150 mm
Power extension units LSG18 + LSG36 2 x LSG36
Electrical connection 400 V 3N ~ 50 Hz
Connection mains – control unit 3 x 1.5 mm2
Connection LSG – heater 2 x (5 x 4mm2) and 2 x (5 x 6mm2) 4 x (5 x 6 mm2)
Connection control unit – power
extension unit 4 x 1.5 mm2
Connection mains – power
extension unit
LSG18: 5 x 6 mm²
LSG36: 5 x 16 mm²
Leakage current Max. 0.75 mA per kW heater output
Fuse protection for control unit 1 x 16 A
Fuse protection for LSG unit 3 x 35 A, 3 x 63 A 2 x (3 x 35 A) 2 x (3 x 63 A)

EN-14 Installation and Operating Instructions - EOS Mega / Mega HD
Identification
EN
2.6 Intended use
This heater is intended solely for the purpose of heating sauna cabins,
together with a suitable control unit and two power extension units.
EOS Mega HD is a free-standing heater that is suitable for commercially
used cabins.
The heater is not suitable for outdoor use.
It must be operated only in sauna cabins and may not be exposed to envi-
ronmental conditions such as extreme humidity and moisture or the possi-
ble formation of condensation or corrosive substances in the ambient air,
as well as other weather conditions.
Any use beyond this is considered improper use. Proper use also includes
compliance with operating, maintenance and servicing requirements.
Foreseeable misuse
The following are considered instances of foreseeable misuse:
The heater power does not match the sauna volume.
The control and sensor cable plugs are plugged in incorrectly.
The unit is operated without knowledge of or compliance with the
safety instructions.
Operating, service and maintenance requirements are not observed.
The unit is operated after technical or other modifications are made to
the relay box.
The unit is operated with insufficient air supply or exhaust air.
The unit is operated without sauna stones or with a rock store that is not
filled as directed.
The unit is operated by children under 8 years of age.
The unit is operated by children 8 years of age or older, or persons with
reduced mental capacity who have not been thoroughly instructed in
its use.
The manufacturer is not liable for unauthorised modifications made to the
equipment and damages resulting from these modifications. The person
modifying the equipment alone shall bear the associated risk.

EOS Mega / Mega HD - Installation and Operating Instructions EN-15
Identification
General instructions
Please note that an optimal sauna climate can be achieved only if the
cabin with its air inlets and outlets, the sauna heater, and the control
unit are synchronized.
Observe the specifications and information provided by your sauna
retailer.
The sauna heaters heat the sauna cabin with heated convection air.
Fresh air is drawn in through the air inlet. It is warmed and rises (convec-
tion) and is then circulated in the cabin. Some of the used air is pushed
out of the cabin through the cabin's air outlet. This creates a typical
sauna climate in which temperatures of approx. 110°C are achieved
directly below the ceiling. These temperatures drop to approx. 30–40°C
in the cabin along the floor.
Therefore, it is not unusual that if the temperature sensor above the
heater reads 110°C, the thermometer that is mounted approx. 20–
25 cm below the cabin ceiling on the sauna wall reads only 85°C.
When the max. temperature is set for the area around the upper sauna
bench, the bathing temperature is typically between 80°C and 90°C.
Please note that the highest temperatures in the cabin are always above
the sauna heater and that is where the temperature sensor and safety
temperature limiter should be mounted according to the installation
instructions.
The first time the cabin is heated, you may notice a slight odour result-
ing from the evaporation of consumables used in the manufacturing
processes. Air out your cabin once it has been heated and before using
the sauna.

3
EN-16 Installation and Operating Instructions - EOS Mega / Mega HD
Installation
EN
Installation
This chapter describes how to install Mega HD. Prior to installing the
heater, air inlets and outlets must be installed in the cabin.
It may be necessary to mount additional fans in the inlets/outlets.
All protective films must be removed.
NOTICE
Damage due to incorrect mounting location
The heater is not suitable for outdoor use.
The heater must be operated only inside buildings and may not
be exposed to environmental conditions such as extreme hu-
midity and moisture or the possible formation of condensation
or corrosive substances in the ambient air, as well as other
weather conditions.
The heater is not designed to be installed or set up in an alcove
or under a bench or sloping roof.
3.1 Specifications for the cabin
The cabin must be planned and installed according to specifications before
the heater is installed. It must be ensured that the heater can be removed
from the cabin even after the cabin has been installed
All electrical installations laid inside the cabin must be suitable for a tem-
perature of at least 170°C.
All lines must be routed in such a way that they are well-protected, e.g. in a
cable duct.
If single-core lines are used as connecting cables, they must be protected
by a flexible metal hose that is connected to the protective conductor.
The minimum cross-section of the connecting cable and the recom-
mended heater power in kW in relation to the cabin volume can be found
here: 2.5 Technical data, EN-13.
In general, it should be noted that the sauna heater must not be set on a
floor made of highly flammable material such as laminate, flooring made
of plastic material, etc. Ceramic tiles are recommended as a flooring option.
Floor heating in the sauna cabin increases the temperature of the floor's
surface temperature.

EOS Mega / Mega HD - Installation and Operating Instructions EN-17
Installation
3.1.1 Installation site
Ceiling height of at least 250 cm
Distance between heater and cabin wall at least 12 cm
Distance between heater and bench at least 12 cm
The required heater power depends on the cabin volume.
See 2.5 Technical data, EN-13
Dimensions in the cabin
A Cabin ceiling
B Temperature sensor
C Cabin wall
D Heater
E Air inlet
F Heater guard rail
> 150 cm
32 cm
> 12 cm
> 12 cm > 12 cm
120 cm
~100 cm
80 cm
A
D
A
C
F
B
B
DD CE

EN-18 Installation and Operating Instructions - EOS Mega / Mega HD
Installation
EN
3.1.2 Air inlets and outlets
WARNING
Fire hazard from overheating
The heater can overheat if the air supply is insufficient. There is a
risk of death due to fire.
Ensure that the air inlets and outlets provide sufficient ventila-
tion. Install a fan if necessary.
Start the sauna only after all air inlets and outlets have been
opened.
NOTICE
Heating process takes too long
If the heat-up process takes a long time, the underlying reason can
be that the heater has an insufficient fresh air supply.
A minimum of 5 times the cabin volume of air per hour must be
exchanged.
Air inlets and outlets must be installed in the cabin to ensure a sufficient air
flow in the cabin and to prevent the heater from overheating. To support
ventilation, a fan can also be mounted, preferably on the side of the
exhaust air.
The required size of the air inlets and outlets depends on the heater out-
put; see 2.5 Technical data, EN-13.
Depending on the location of the heater, the air inlet must be installed
behind or below the heater.
Heater is located at the cabin wall, EN-19
Heater is located in the middle of the cabin or in front of a glass wall, 
EN-19

EOS Mega / Mega HD - Installation and Operating Instructions EN-19
Installation
Heater is located at the cabin wall
The air inlet must meet the following criteria:
Location: Behind the heater
Height: 10 cm above the cabin floor
If the natural air flow is insufficient, a fan should be installed at the air inlet
side, if necessary.
Installing the air inlet in the cabin wall
Heater is located in the middle of the cabin or in front of a glass wall
The air inlet can be either a large opening or two small openings.
The air inlet must meet the following criteria:
Location: Below the heater
A duct directs fresh air to the opening or openings.
If the natural air flow is insufficient, a fan may need to be installed at the
air inlet side.
Installing the air inlet in the middle of the cabin
A Cabin wall B Air inlet
A Air inlet
B
A
A AA

EN-20 Installation and Operating Instructions - EOS Mega / Mega HD
Installation
EN
Air outlet
The air outlet must meet the following criteria:
Location: across from the heater
Height: 30–50 cm above the cabin floor
3.1.3 Connecting cables
The sauna heater must be connected to the control unit or control unit and
relay box by means of four connecting cables. Two cables must connect to
the terminal boxes on the front and two cables must connect to the termi-
nal boxes at the rear of the heater.
Install the cables in such a way that they are protected from damage. To do
this, route empty pipes from the installation site of the sauna heater to the
relay boxes.
Outside of the cabin, the cables must be routed under a suitable protective
cover (e.g. in a cable duct or empty conduits).
See the connection diagram Connection diagram, EN-27
If there are no empty pipes in your cabin, drill a hole in the cabin wall
directly next to the sauna heater where the cable emerges from the sauna
heater, and guide the cable through this hole outward to the control unit
and relay box. The hole must be large enough to accommodate the cable.
The cable and all other connecting cables (supply line to mains and cabin
lighting) on the external side of the cabin must be protected from damage.
To do this, use installation pipes or attach a suitable protective cover.