EOS Mega S HD User manual

Druck-Nr.: 2902 5314
Stand: 50/22
EN
Made in Germany
EOS Mega S HD
Heater for Sauna Cabins
Installation and Operating Instructions

EN-2 Installation and Operating Instructions - EOS Mega S 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
Revision history
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
Date Version Description
8 Dec. 2022 01.00 First version

EOS Mega S HD - Installation and Operating Instructions EN-3
Contents
Documentation..................................................................................................EN-2
1 General safety instructions..........................................................................EN-5
1.1 Mounting and electrical installation .................................................EN-5
1.2 Operator instruction ...............................................................................EN-6
1.3 Safety levels................................................................................................EN-9
1.4 Standards and regulations....................................................................EN-9
2 Identification.................................................................................................... EN-10
2.1 Requirements for operation ............................................................. EN-10
2.2 Nameplate ............................................................................................... EN-10
2.3 Scope of delivery................................................................................... EN-11
2.4 Technical data ........................................................................................ EN-12
2.5 Intended use........................................................................................... EN-12
3 Installation ........................................................................................................ EN-14
3.1 Specifications for the cabin............................................................... EN-14
3.1.1 Installation site ...................................................................... EN-14
3.1.2 Air inlets and outlets............................................................ EN-15
3.1.3 Connecting cables................................................................ EN-17
3.2 Specifications for the control unit................................................... EN-18
3.3 Temperature sensor in the cabin ................................................... EN-18
3.4 Mounting the heater............................................................................ EN-18
4 Electrical installation.................................................................................... EN-22
4.1 General instructions for electrical installation............................ EN-22
4.2 Terminal diagram for Mega S HD.................................................... EN-23
4.3 Connection diagrams for Mega S HD ............................................ EN-24
4.4 Establishing an electrical connection............................................ EN-27
4.5 Heating period limitation................................................................... EN-31
5 Commissioning ............................................................................................... EN-32
5.1 Filling rock stores with stones .......................................................... EN-32
5.2 Commissioning by remote control................................................. EN-34
5.3 Water splash............................................................................................ EN-34
6 Maintenance..................................................................................................... EN-35
6.1 Cleaning.................................................................................................... EN-35
6.2 Sauna stones........................................................................................... EN-35
6.3 Replacing the tubular heating elements...................................... EN-36
6.4 Troubleshooting.................................................................................... EN-39

EN-4 Installation and Operating Instructions - EOS Mega S HD
EN
7 General terms and conditions of service ...........................................EN-40
8 Disposal ..............................................................................................................EN-43

1
EOS Mega S HD - Installation and Operating Instructions EN-5
General safety instructions
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, relay boxes and other
electrical systems or equipment with a fixed mains connection
must only be performed by a trained electrician from an author-
ised 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 specialist.
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 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.

EN-6 Installation and Operating Instructions - EOS Mega S HD
General safety instructions
EN
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 specialist.
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.
Equipment damage
due to overuse
If the cabin is used commercially, the heating time 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.

EOS Mega S HD - Installation and Operating Instructions EN-7
General safety instructions
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.
Operating the unit This unit should not be used by children or persons with reduced
mental capacity or limited physical or sensory abilities. Children
must not play with the unit. Cleaning and user maintenance must
not be performed by children.
Children must be supervised to ensure they do not play with
the unit.

EN-8 Installation and Operating Instructions - EOS Mega S HD
General safety instructions
EN
Sauna cabin and
heater
The sauna cabin must be constructed with proper material and
built in a professional manner, and the heater must be suited for
the cabin.
Sauna heaters and control units may only be used in sauna cab-
ins made of suitable, low-resin and untreated material (e.g. Nor-
dic spruce).
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 the 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 below or behind the sauna heater,
approx. 5 to 10 cm above the floor. The minimum dimensions
of the air inlets and outlets can be found here: 2.4 Technical
data, EN-12, 3.1.2 Air inlets and outlets, EN-15.
The exhaust openings are always installed in the lower part of
the wall diagonal to the sauna heater. The supply and exhaust
openings must not be closed. Please observe the instructions
provided by your sauna cabin manufacturer.
Use one of the control units listed below to check and control
the sauna heater. This control unit is fixed to a suitable location
on the cabin's external wall, and the corresponding sensor
housings according to the installation instructions that accom-
pany the control units inside the sauna cabin.
The cabin lighting and its installation must comply with splash-
proof requirements as stated in DIN EN VDE 0100 Part 703. Only
one sauna light with a maximum of 40 W may be installed with
this sauna heater.
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.

EOS Mega S HD - Installation and Operating Instructions EN-9
General safety instructions
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 heaters, please refer to the individual product’s
technical data sheet that can be downloaded from www.eos-sauna.com.

2
EN-10 Installation and Operating Instructions - EOS Mega S HD
Identification
EN
Identification
EOS Mega S HD is an electrically heated Finnish sauna heater available in a
variety of output capacities.
2.1 Requirements for operation
The heater must be operated together with one control unit and two relay
boxes. 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
EOS Compact series
The type of relay boxes required depend on the output capacity of the
heater. See Heater data, EN-12
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 S 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

EOS Mega S HD - Installation and Operating Instructions EN-11
Identification
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:
Accessories (optional)
A heater guard rail may be placed 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

EN-12 Installation and Operating Instructions - EOS Mega S HD
Identification
EN
Rocks can be purchased separately and are not included in the scope of
delivery. Use rocks with a grain size of > 10 cm.
2.4 Technical data
Electrical connection data
Heater data
2.5 Intended use
This heater is intended solely for the purpose of heating sauna cabins,
together with a suitable control unit and two relay boxes.
EOS Mega S 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.
Accessories Item no.
Sauna stones, 20 kg 94.7340
Brackets for heater guard rail 94.7183
Brackets and wooden frame (abachi) 94.8047
Brackets and wooden frame (walnut) 94.8048
Heater output Electrical con-
nection
Fuse protec-
tion for con-
trol unit
Fuse protec-
tion for LSG
unit
Connection
mains –
control unit
Connection
LSG – heater
Connection
control unit –
power exten-
sion unit
36 kW
400 V 3N ~
50 Hz
3 x 16 A 3 x 63 A
3 x 1.5 mm2
4 x (5 x 2.5 mm2
)4 x 1.5 mm2
42 kW
1 x 16 A 3 x 35 A
3 x 63 A
2 x (5 x 4 mm2)
and
2 x (5 x 6 mm2)
4 x 1.0 mm2
48 kW
Heater output
Unit dimen-
sions HxWxD
in cm
For sauna
cabin size
Minimum size
of air inlet and
outlet
Weight with-
out rocks Stone filling Relay boxes
36 kW
100 x 90 x 80
60–75 m350 x 10 cm ~110 kg ~95 kg
Grain size
100–150 mm
LSG36
42 kW 65–80 m350 x 12 cm ~111 kg LSG18 + LSG36
48 kW 70–90 m360 x 12 cm ~112 kg

EOS Mega S HD - Installation and Operating Instructions EN-13
Identification
Any use beyond this is considered improper use. Proper use also includes
compliance with operating, maintenance and servicing requirements.
The manufacturer is not responsible for unauthorised modifications and
damages resulting from these modifications; the person modifying the
equipment alone shall bear the associated risk.
Foreseeable misuse
The following are considered instances of foreseeable misuse:
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 by children or persons with reduced mental capac-
ity or by persons who have not been thoroughly instructed in its use.
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 tem-
perature 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 for the control units.
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-14 Installation and Operating Instructions - EOS Mega S HD
Installation
EN
Installation
This chapter describes how to install the Mega S HD sauna heater. Prior to
installing the unit, air inlets and outlets must be installed in the cabin. It
may be necessary to mount additional fans in the inlets/outlets. All protec-
tive 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.
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.
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.
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 cabin volume depends on the heater output.
See 2.4 Technical data, EN-12

EOS Mega S HD - Installation and Operating Instructions EN-15
Installation
Dimensions in the cabin (in cm)
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.
Commission the cabin only after all air inlets and outlets have
been opened.
NOTICE
Heating process delayed
If the heating process takes a long time, the underlying reason is
that the heater receives insufficient air.
A minimum of 5 times the cabin volume of air per hour must be
exchanged.
A Cabin ceiling
B Temperature sensor
C Cabin wall
D Heater
E Air inlet
F Heater guard rail
32 cm
> 12 cm
80 cm
> 12 cm
> 150 cm
> 12 cm
90 cm
~100 cm
A
DD
A
CC
F
B
B
E

EN-16 Installation and Operating Instructions - EOS Mega S HD
Installation
EN
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.
The required size of the air inlets and outlets depends on the heater out-
put; see 2.4 Technical data, EN-12.
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-16
Heater is located in the middle of the cabin or in front of a glass wall, 
EN-16
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 there is still not enough fresh air to reach the heater, a fan must be
installed at the opening outside of the cabin.
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.
A fan must be mounted at the beginning of the duct outside of the
cabin.
A Cabin wall B Air inlet
B
A

EOS Mega S HD - Installation and Operating Instructions EN-17
Installation
Air inlet in the middle of the cabin
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 heater must be connected to the relay boxes with four connecting
cables. Install the cables in such a way that they are protected from dam-
age. To do this, route empty pipes from the installation site of the heater to
the relay boxes.
Two cables must connect to the terminal boxes on the front and back of
the heater.
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 Terminal diagram for Mega S HD, EN-23
90 cm
~100 cm

EN-18 Installation and Operating Instructions - EOS Mega S HD
Installation
EN
3.2 Specifications for the control unit
Observe the operating conditions for the control unit to ensure that the
sauna cabin's temperature control works properly. The installation site
must be selected accordingly. Specifications can be found in the installa-
tion instructions for the control unit or in the instructions provided by the
manufacturer of the control unit.
3.3 Temperature sensor in the cabin
The temperature sensor should be mounted in the middle and flush with
the long side of the heater; see Dimensions in the cabin (in cm), 
EN-15.
3.4 Mounting the heater
The heater is supplied mounted and packaged on a pallet.
Once the cabin is prepared, the heater is placed on a pre-defined installa-
tion site. To reduce the weight of the heater for transport, the rock stores
are removed. The outer casing on the long side of the heater is removed.
Four people should always transport the heater.
Two people should always install the rock store.
Tool:
Screwdriver
Necessary steps:
Unpacking the heater, EN-19
Opening the heater housing, EN-20
Setting up the heater, EN-21

EOS Mega S HD - Installation and Operating Instructions EN-19
Installation
Unpacking the heater
1Remove the heater from the packaging and leave the heater on the pal-
let.
The rock stores (A) and (B), the outer casing (D) and the base
covers (E) have already been installed.
2Lift the middle rock store (A) and bottom rock store (B) from the heater.
The V-shape profiles are loosely situated in the openings. Ensure that
they do not fall out.
A Middle rock store
B Bottom rock store
C Housing
D Outer casing
E Base cover
C
A
B
D
E

EN-20 Installation and Operating Instructions - EOS Mega S HD
Installation
EN
Opening the heater housing
1Loosen 2 screws on the right side of each base cover.
2Remove the base covers.
3Remove the rock store.
4Unscrew the 3 retaining screws at the top and bottom of the outer cas-
ing.