EOS Invisio Midi User manual

Druck-Nr.: 2902 4839
Stand: 46/2023
EN
Made in Germany
EOS Invisio Midi
Heater for Sauna Cabins
Installation and Operating Instructions

EN-2 Installation and Operating Instructions - EOS Invisio Midi
EN Documentation
Documentation
Manufacturer
Original installation instructions EN
Copyright for these installation instructions remains with
EOS Saunatechnik GmbH.
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 ser[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
13 Nov. 2023 01.20 Switch to DIN A5, edits
26 Jan. 2022 01.10 UKCA added, edits
27 April 2020 01.00 First version

EOS Invisio Midi - 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-8
1.3 Safety levels.............................................................................................EN-11
1.4 Standards and regulations.................................................................EN-11
2 Identification.................................................................................................... EN-12
2.1 Requirements for operation .............................................................EN-12
2.2 Nameplate ...............................................................................................EN-12
2.3 Scope of delivery ...................................................................................EN-13
2.4 Technical data.........................................................................................EN-14
2.5 Intended use ...........................................................................................EN-15
3 Installation ........................................................................................................EN-18
3.1 Specifications for the cabin ...............................................................EN-19
3.1.1 Installation site ......................................................................EN-19
3.1.2 Air inlets and outlets............................................................EN-21
3.1.3 Connecting cable.................................................................. EN-21
3.1.4 Temperature sensor ............................................................ EN-22
3.2 Installing the heater ............................................................................. EN-23
3.3 Dividing wall and protective grill ....................................................EN-29
3.4 Affix warning plates in the cabin.....................................................EN-30
4 Electrical installation....................................................................................EN-31
4.1 General instructions for electrical installation............................EN-31
4.2 Connection diagram ............................................................................EN-32
4.2.1 Connecting to 400 V 3N ~.................................................. EN-32
4.2.2 Connecting to 230 V 1N ~.................................................. EN-33
4.3 Internal wiring ........................................................................................EN-34
4.4 Establishing an electrical connection ............................................EN-36
4.5 Heating period limitation................................................................... EN-36

EN-4 Installation and Operating Instructions - EOS Invisio Midi
EN
5 Commissioning................................................................................................EN-37
5.1 Starting the heater ................................................................................EN-37
5.2 Water splash ............................................................................................EN-38
6 Service and maintenance ...........................................................................EN-39
6.1 Cleaning ....................................................................................................EN-39
6.2 Sauna stones............................................................................................EN-40
6.3 Replacing the tubular heating elements.......................................EN-41
6.4 Troubleshooting.....................................................................................EN-44
7 General terms and conditions of service ............................................EN-46
8 Disposal...............................................................................................................EN-49

EOS Invisio Midi - Installation and Operating Instructions EN-5
General safety instructions
1 General safety instructions
1.1 Mounting and electrical installation
These installation instructions are intended for quali-
fied personnel familiar with the laws and regulations
applicable to electrical installations at the installation
site. Observe the following general safety instructions
during mounting, configuration and commissioning of the pro-
duct.
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 au-
thorised 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 specia-
list.
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 inst-
ructions.

EN-6 Installation and Operating Instructions - EOS Invisio Midi
EN General safety instructions
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). Cera-
mic tiles are recommended as a flooring option.
Risk of burns from hot glass
Glass surfaces in the cabin become hot while the sauna is in ope-
ration.
When installing the cabin, ensure that the touchable glass sur-
faces on the outside of the cabin may reach a maximum tempe-
rature 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 tou-
ched, 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 sui-
table, 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, depen-
ding on the position, an additional safety temperature limiter
must be installed for each additional heater.
Receptacles may not be installed inside the sauna cabin.

EOS Invisio Midi - Installation and Operating Instructions EN-7
General safety instructions
Each sauna cabin must have air inlets and outlets. The air inlets
and outlets may be installed from below or from behind the he-
ater. The minimum dimensions of the air inlets and outlets can
be found here: 2.4 Technical data, EN-14,
3.1.1 Installation site, EN-19
The air outlet is always installed in the lower part of the wall, dia-
gonal to the heater. The air inlets and
outlets must not be closed. Observe the instructions provided
by your sauna cabin manufacturer.
Use one of the control units specified below for control of the
sauna heater. This control unit should be mounted in a suitable
location on the sauna’s outside wall, and the corresponding
temperature sensors inside the sauna as per the installation in-
structions for the control unit.
Electrical installations and equipment in the sauna cabin must
comply with IEC 60364-7-703 (DIN VDE 0100-703).
The cabin lighting must be safe for sauna cabin use and instal-
led in such a way that it can be used safely in a sauna cabin. En-
sure that the heater is installed in compliance with the
standards 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.

EN-8 Installation and Operating Instructions - EOS Invisio Midi
EN General safety instructions
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.
The operator must make the end user aware of safety instructions
that are relevant to the end user.
The operator must be familiar with the settings for the heating pe-
riod and understand how it is controlled.
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 specia-
list.
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 switching.
If you switch on the heater using pre-set timers or remotely, at-
tach a protective cover to the heater or install a suitable safety
system.

EOS Invisio Midi - Installation and Operating Instructions EN-9
General safety instructions
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.
Damage to health
Excessive time spent in a heated sauna cabin can lead to overhea-
ting 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. Sym-
ptoms of hyperthermia include fever, dizziness, lethargy, sleepi-
ness, and fainting. Side effects of hyperthermia include perception
disorders, inability to recognize the need to leave the room, inabi-
lity to identify imminent danger, harm to the foetus in the case of
pregnant women, inability to physically leave the room, unconsci-
ousness.
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.

EN-10 Installation and Operating Instructions - EOS Invisio Midi
EN General safety instructions
Operation by children or persons with reduced mental
capacity
Children and persons with reduced physical, mental or sensory
abilities must be supervised to ensure that they do not play
with the unit.
Children under 8 years of age should not operate the sauna ca-
bin.
The settings for the heating period must only be changed by
children under 8 years of age if they are supervised by an adult.
The sauna cabin must only be used by persons with reduced
mental capacity, or limited physical or sensory abilities under
supervision or if they have been previously instructed in its use
and understand the risks.
Children and persons who have not received proper instruction
must not clean or service the system.

EOS Invisio Midi - Installation and Operating Instructions EN-11
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 heater, please refer to the individual product’s
technical data sheet that can be downloaded from www.eos-sauna.com.
Local regulations also apply to the installation and operation of heating,
sauna, and steam room systems.

EN-12 Installation and Operating Instructions - EOS Invisio Midi
EN Identification
2 Identification
EOS Invisio Midi 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 with one of the following control units:
Econ D series (Econ D1 – up to 9 kW only)
Compact D series (Compact D18/H18 – no LSG required for 12 kW)
EmoTec D/H
EmoStyle D/H
EmoTouch 3
The control unit is not included in the scope of delivery.
A power extension unit (PEB 10) is also required for the output capacity
12 kW.
2.2 Nameplate
A Name F Manufacturer
B Model G Heater output
C Item number H Manufacturing date
D Electrical connection I Serial number
E Country of origin
Elektro-Saunaofen
Type EOS Invisio Midi
Art.-Nr. 94 XXXX 0X
400V 3N a50 Hz XX kW
Made in Germany S-No. 14.20 00001
EOS SAUNATECHNIK GmbH, 35759 Driedorf
IPX4
A
B
C
E
F
D
GH I

EOS Invisio Midi - Installation and Operating Instructions EN-13
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 compo-
nents are missing or damaged. The unit must not be operated if compo-
nents are missing or damaged.
The following parts are included in the scope of delivery:
A Trough with connection hose
B Protective grill
C Angled tube of stainless steel
D Sauna heater
E 4 adjustable legs
F Installation and Operating Instructions
G Mounting material and warning sign




A
B
C
D
EF
G

EN-14 Installation and Operating Instructions - EOS Invisio Midi
EN Identification
Accessories (optional)
2.4 Technical data
All line cross-section specifications are the minimum cross-sections of a
copper line.
*) Not required for Compact D18/H18 control units.
Accessories (optional) Item no.
Distributor for 1-phase connection 94.2689
Sauna stones, caliber 50–100 mm 94.7336
Heater output per DIN 6 kW 9 kW 12 kW
Unit dimensions HxWxD in cm Height-adjustable
65/71/77 x 116 x 33
for cabin volumes 6–8 m39–14 m314–18 m3
Minimum size
Air inlets and outlets 35 x 4 cm 35 x 6 cm 35 x 7 cm
Weight without rocks 24 kg 25 kg 27 kg
Stone filling ~20 kg, caliber 50–100 mm
Power extension units No No PEB 10*
Electrical connection 400 V 3N ~ 50 Hz
Connection mains – control unit 5 x 2.5mm2
Connection LSG – heater 5 x 1.5mm2
Connection control unit – LSG 4 x 1.5mm2
Connection mains – LSG 5 x 2.5mm2
Fuse protection for control unit 3 x 16 A
LSG fuse 3 x 16 A

EOS Invisio Midi - Installation and Operating Instructions EN-15
Identification
2.5 Intended use
This heater is intended solely for the purpose of heating sauna cabins,
together with a suitable control unit. A power extension unit (PEB 10) is
also required for the output capacity 12 kW.
Invisio Midi is a heater that is installed concealed, e.g. partially under a
bench, and is suitable for cabins used in commercial and private settings.
The heater is not suitable for outdoor use. It must be operated
only inside buildings and may not be exposed to environmen-
tal conditions such as extreme humidity and moisture or the
possible 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.

EN-16 Installation and Operating Instructions - EOS Invisio Midi
EN Identification
Foreseeable misuse
The following are considered instances of foreseeable misuse:
The unit is operated without knowledge of or compliance with the saf-
ety instructions.
Operating, service and maintenance requirements are not observed.
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 unit is operated without sauna stones or with a rock store that is not
filled as directed.
The heater power does not match the sauna volume.
The unit is operated with insufficient air supply or exhaust air.
There is no protective grill above the sauna heater in the cabin.
See 3.3 Dividing wall and protective grill, EN-29
The temperature sensor with safety temperature limiter is installed in
the wrong place. See 3.1.4 Temperature sensor, EN-22
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.

EOS Invisio Midi - Installation and Operating Instructions EN-17
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 resul-
ting from the evaporation of consumables used in the manufacturing
processes. Air out your cabin once it has been heated and before using
the sauna.

EOS Invisio Midi - Installation and Operating Instructions EN-18
Installation
3 Installation
This chapter describes how to install the sauna heater. Place the heater
under a recliner bench. 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 we-
ather conditions.

EOS Invisio Midi - Installation and Operating Instructions EN-19
Installation
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 floor on which the heater stands must be level. In general, it should be
noted that the sauna heater must not be set on a floor made of highly flam-
mable 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 190 cm
Distance heater – cabin wall min. 4 cm
Distance heater – top edge of dividing wall min. 100 cm
The clearance distance between the heater and flammable material
(wood wall, sauna bench, etc.) must be observed as shown below.
The supplied protective grill must be mounted above the heater on the
top edge of the dividing wall facing the sauna's rear wall. This prevents
objects from falling onto the heater.
The required heater power depends on the cabin volume.
See 2.4 Technical data, EN-14.

EN-20 Installation and Operating Instructions - EOS Invisio Midi
EN Installation
Dimensions in the cabin
A Protective grill D Trough
B Dividing wall E Heater
C Temperature sensor/safety tempe-
rature limiter
F Air inlet
>1 cm
10,5 cm
>3cm
> 190 cm
10cm
72 (66/60) cm
> 160 cm
100 cm
31,5 cm4,5 cm
>1 cm
>3cm
> 4cm
77 (71/65) cm
116cm
8cm
124 cm
>30 cm
AA
C
B
F
E
D