EOS Invisio Midi NA User manual

Druck-Nr.: 2902 5260
Stand: 50/22
EN
Made in Germany
EOS Invisio Midi NA
Heater for Sauna Cabins
Installation and Operating Instructions

EN-2 Installation and Operating Instructions - EOS Invisio Midi NA
EN Documentation
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 authorization, 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
15 May 2022 01.00 First version

EOS Invisio Midi NA - 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 Heater and cabin labels....................................................................... EN-11
1.4 Safety levels.............................................................................................EN-14
1.5 Standards and regulations.................................................................EN-14
2 Identification.................................................................................................... EN-15
2.1 Requirements for operation .............................................................EN-15
2.2 Nameplate ...............................................................................................EN-15
2.3 Scope of delivery ...................................................................................EN-16
2.4 Technical data.........................................................................................EN-17
2.5 Intended use ...........................................................................................EN-19
3 Installation ........................................................................................................EN-21
3.1 Specifications for the cabin ...............................................................EN-21
3.1.1 Electrical lines.........................................................................EN-21
3.1.2 Installation site ......................................................................EN-21
3.1.3 Temperature sensor ............................................................ EN-26
3.1.4 Air inlets and outlets............................................................EN-26
3.1.5 Connecting cables ................................................................EN-27
3.2 Installing the heater ............................................................................. EN-27
3.3 Dividing wall and protective grill ....................................................EN-39
3.4 Attaching warning plates inside the cabin..................................EN-40
4 Connections......................................................................................................EN-41
4.1 General instructions for electrical installation............................EN-41
4.2 Connections ............................................................................................EN-42
4.3 Internal wiring ........................................................................................EN-43
4.4 Establishing an electrical connection ............................................EN-45
4.5 Heating time limitation.......................................................................EN-45

EN-4 Installation and Operating Instructions - EOS Invisio Midi NA
EN
5 Commissioning................................................................................................EN-46
5.1 Starting the heater ................................................................................EN-46
5.2 Water splash ............................................................................................EN-47
6 Maintenance .....................................................................................................EN-48
6.1 Cleaning ....................................................................................................EN-48
6.2 Sauna stones............................................................................................EN-48
6.3 Replacing the heating elements ......................................................EN-51
6.4 Resetting the safety temperature limiter......................................EN-56
6.5 Troubleshooting.....................................................................................EN-57
7 General terms and conditions of service ............................................EN-58
8 Disposal...............................................................................................................EN-61

EOS Invisio Midi NA - Installation and Operating Instructions EN-5
General safety instructions
1 General safety instructions
1.1 Mounting and electrical installation
The installation instructions are intended for qualified
personnel familiar with the laws and regulations appli-
cable to electrical installations at the installation site.
Observe the following general safety instructions
during mounting, configuration and commissioning
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 autho-
rized 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 qualified electri-
cian.
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.

EN-6 Installation and Operating Instructions - EOS Invisio Midi NA
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). Ce-
ramic 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 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/168.8 °F. 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 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.,
Nordic 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.

EOS Invisio Midi NA - Installation and Operating Instructions EN-7
General safety instructions
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. 5–10 cm/2–4 inches above the floor. The minimum di-
mensions of the air inlets and outlets can be found here:
2.4 Technical data, EN-17, 3.1.2 Installation site, EN-21.
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 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 stan-
dards 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 NA
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
time 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 qualified electri-
cian.
Repairs and installations must only be performed by a trained
electrician.
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 or protective grilles
can easily be ignited and cause fires.
Do not place objects on the heater.
Fill rock stores with stones as directed.
Inspect the sauna cabin prior to each commis-
sioning.
If you switch on the heater using pre-set timers or a remote con-
trol, attach a protective cover to the heater or install a suitable
safety system.

EOS Invisio Midi NA - 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 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 fetus in
the case of pregnant women, inability to physically leave the
room, 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.

EN-10 Installation and Operating Instructions - EOS Invisio Midi NA
EN General safety instructions
Operation by children or persons with reduced mental
capacity
Children and persons with reduced mental capacity can put them-
selves at risk.
Children must be supervised to ensure they do not play with
the unit.
Children under 8 years of age should not operate the sauna
cabin.
The settings for the heating time must only be changed by chil-
dren 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 NA - Installation and Operating Instructions EN-11
General safety instructions
1.3 Heater and cabin labels
The following labels must be attached in accordance with UL 875 – Electric
Dry-Bath Heaters.
Heater – left side
Observe the important additional instructions in the
manual! Suitable for damp location.
Consultez les instructions supplémentaires import-
antes dans le manual! Convient pour un emplace-
ment humide
Print no. 29345299 / 14.22
mm inch
A
B
C
D
E
F
1100
300
100
> 10
> 30
80
43,3
11,8
3,9
0,4
1,12
3,2
31545
B
D
A
E
C
F
D
1
1
= power supply
3,2 - 4,2 qm x 1,90 m
34,5 - 45,2 sq ft x 6,2 ft
4,7 - 7,4 qm x 1,90 m
50,6 - 79,7 sq ft x 6,2 ft
7,4 - 9,5 qm x 1,90 m
79,7 - 102,3 sq ft x 6,2 ft
35 x 5 cm
1,2 x 0,2 ft
35 x 6 cm
1,2 x 0,2 ft
35 x 7 cm
1,2 x 0,3 ft
Cabin volume
Volumes de cabine
Heater output
Puissance du poêle
Print no. 2934 5300 / 14.22
FOR SUPPLY CONNECTIONS USE ONLY COPPER WIRE CABLE SUITABLE FOR AT
LEAST 90 °C.
POUR LES CONNEXIONS ÉLECTRIQUES PREVOIR UN CABLAGE DE CUIVRE
RÉSISTANT AU MOINS À 90° C .
Location of control unit in a dry area /
Emplacement de l’unité de commande dans une zone sèche
EmoTec USA/CAN D/H
Minimum ventilation
Ventilation minimale
6,0 kW
9,0 kW
12,0 kW
WARNING
REDUCE THE RISK OF FIRES
Do Not Install Closer Than 900 mm (or 35,4 inches)
To A Horizontal Surface (Ceiling).
29345271_F38.2_2001xxxx
AVERTISSEMENT
RÉDUIRELE RISQUE D‘INCENDIE
Ne pas installer à moins de 900 mm (ou 35,4 pouces)
d’une surface horizontale (plafond).
29345265_F38.2 / 2001xxxx

EN-12 Installation and Operating Instructions - EOS Invisio Midi NA
EN General safety instructions
Heater – front and right side
WARNING
REDUCE THE RISK OF ELECTROCUTION
29344837_F38.1_ 20016970
AVERTISSEMENT
RÉDUIRE LE RISQUE D’ÉLECTROCUTION
29345263_F38.1 / 2001xxxx
WARNING
REDUCE THE RISK OF
ELECTROCUTION AND BURNS
Do Not Operate Unless Guard Is In Place.
29344841_F38.3_20016094
AVERTISSEMENT
RÉDUIRE LE RISQUE DE
ÉLECTROCUTION ET BRÛLURES
29345266_F38.3 / 2001xxxx
Sauna heater
Type EOS Invisio Midi NA
Art.-Nr. 94 xxx 00
240 V 2Ph AC 60 Hz 9 kW
Made in Germany S-No. 30.22 00002
IPX4
5023683
CONFORMS TO
UL STD 875
CERTIFIED TO
CAN/CSA STD
E60335-1/4E
E60335-2-53
EOS SAUNATECHNIK GmbH, Schneiderstriesch 1, 35759 Driedorf
WARNING!
AVERTISSEMENT!
NE PAS PLACER DES OBJETS AU-DESSUS DU POÊLE. IL Y A UN RISQUE D‘IN-
CENDIE SI LE POÊLE EST RECOUVERT.
IL Y A UN RISQUE D‘INCENDIE SI LE COMPARTIMENT DE PIERRES N‘EST PAS
CORRECTEMENT REMPLI.
NE PAC CHAUFFER SANS PIERRES.
Print no. 29345269 / 02.22
DO NOT PLACE ANY OBJECTS ON HEATER. COVERING CAUSES FIRE RISK.
AN INADEQUATELY FILLED ROCK STORE CAUSES FIRE RISK.
DO NOT OPERATEWITHOUT ROCKS.
For household use only
Uniquement pour
usage privé

EOS Invisio Midi NA - Installation and Operating Instructions EN-13
General safety instructions
Cabin
The warnings for sauna users must be affixed outside the cabin so they are
clearly visible at eye level.
CAUTION
REDUCE THE RISK OF FIRE
29344843_F38.5_20016096
ATTENTION
RÉDUIRE LE RISQUE D’INCENDIE
29345268_F38.5 / 2001xxxx
WARNING
REDUCE THE RISK OF OVERHEATING
1. Exit immediately if uncomfortable, dizzy, or sleepy.
Staying too long in a heated area is capable of caus-
2.
3. Check with a doctor before use if pregnant, in poor
health, or under medical care.
4. -
causing unconsciousness.
29344842_F38.4_20016095
AVERTISSEMENT
RÉDUIRE LE RISQUE DE SURCHAUFFE
1. Sortez immédiatement si vous êtes mal à l’aise, étour-
di ou somnolent. Séjourner trop longtemps dans une
2. Surveillez les enfants à tout moment.
3. -
ceinte, en mauvaise santé ou sous traitement médical.
4.
entraîner une perte de conscience.
29345267_F38.4 / 2001xxxx

EN-14 Installation and Operating Instructions - EOS Invisio Midi NA
EN General safety instructions
1.4 Safety levels
Safety instructions and important operating instructions are classified
according to ANSI Z535.6. Please familiarize 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.
1.5 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.
Local regulations also apply to the installation and operation of heating,
sauna, and steam room systems.

EOS Invisio Midi NA - Installation and Operating Instructions EN-15
Identification
2 Identification
EOS Invisio Midi NA is an electrically heated sauna heater for Finnish mode
available in a variety of output capacities.
2.1 Requirements for operation
The heater can be operated with the following control unit:
EOS EmoTec D/H USA/CAN
The control unit is not included in the scope of delivery.
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
Sauna heater
Type EOS Invisio Midi NA
Art.-Nr. 94 xxx 00
240 V 2Ph AC 60 Hz 9 kW
Made in Germany S-No. 30.22 00002
IPX4
5023683
CONFORMS TO
UL STD 875
CERTIFIED TO
CAN/CSA STD
E60335-1/4E
E60335-2-53
EOS SAUNATECHNIK GmbH, Schneiderstriesch 1, 35759 Driedorf
Sauna heater
Type EOS Invisio Midi NA
Art.-Nr. 94 xxx 00
208 V 3Ph AC 60 Hz 9 kW
Made in Germany S-No. 30.22 00002
IPX4
5023683
CONFORMS TO
UL STD 875
CERTIFIED TO
CAN/CSA STD
E60335-1/4E
E60335-2-53
EOS SAUNATECHNIK GmbH, Schneiderstriesch 1, 35759 Driedorf
A
B
C
E
F
D
H IG

EN-16 Installation and Operating Instructions - EOS Invisio Midi NA
EN Identification
2.3 Scope of delivery
Check the delivery to ensure that all components were delivered and that
they are 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:
Scope of delivery
A Trough with connection hose
B Protective grill
C Angled tube of stainless steel
D Sauna heater with hood and water
channel (completely installed)
E 4 adjustable legs
F Installation instructions
G Mounting material and warning
plate
WARNING
REDUCE THE RISK OF OVERHEATING
1. Exit immediately if uncomfortable, dizzy, or sleepy.
Staying too long in a heated area is capable of caus-
2.
3. Check with a doctor before use if pregnant, in poor
health, or under medical care.
4. -
causing unconsciousness.
29344842_F38.4_20016095
A
B
C
D
E
F
G

EOS Invisio Midi NA - Installation and Operating Instructions EN-17
Identification
Accessories (optional)
2.4 Technical data
Electrical connection data
Only use copper lines that are approved for temperatures of min. 180 °C/
356 °F.
When using 4 to 6-core cables, the type of AWG cable specified in the table
increases by one unit.
Example: AWG 12 > AWG 10.
All line cross-section specifications are the minimum cross-sections for the
copper line.
All line cross-section specifications are the minimum cross-sections in mm2
for a copper line.
The following fuses are permitted:
Class G, H, J, K
Type S plug-in fuse
Edison base
Accessories (optional) Item number
Stones – grain size 50–100 mm/2–4 in. 94.7336
Temperature limiter 160 °C/320 °F
Use only original replacement parts.
Model: see component
mounted in the device
Heater
output
Connection
voltage
Connection
cable Fuse
6 kW 208 V 12 AWG 25 A
6 kW 240 V 12 AWG 15 A
9 kW 208 V 12 AWG 35 A
9 kW 240 V 12 AWG 20 A
12 kW 208 V 12 AWG 25 A

EN-18 Installation and Operating Instructions - EOS Invisio Midi NA
EN Identification
Heater
Cabin
Heater
output
Unit dimensions
HxWxD
Weight
without stones
Stone
filling
6 kW
Height-adjustable
71/77 x 116 x 38 cm
2,3/2,5 x 3,8 x 1,4 ft
24 kg
53 lbs.
A20.5 kg
44 lbs.
9 kW 25 kg
55 lbs.
12 kW 27 kg
60 lbs.
Heater
output Cabin volume Minimum size – ventilations
6 kW 3.2–4.2 sq. m x 1.90 m
34.5–45.2 sq. ft. x 6.2 ft.
35 x 5 cm
1.2 x 0.2 ft
9 kW 4.7–7.4 sq. m x 1.90 m
50.6–79.7 sq. ft. x 6.2 ft.
35 x 6 cm
1.2 x 0.2 ft
12 kW 7.4–9.5 sq. m x 1.90 m
79.7–102.3 sq. ft. x 6.2 ft.
35 x 7 cm
1.2 x 0.3 ft

EOS Invisio Midi NA - Installation and Operating Instructions EN-19
Identification
2.5 Intended use
This heater is intended solely for the purpose of heating sauna cabins and
together with a suitable control unit.
Invisio Midi should be operated inside buildings only. It must
not be exposed to environmental conditions such as extreme
humidity and moisture or the possible formation of condensa-
tion or corrosive substances in the ambient air, as well as other
weather conditions.
The heater can be installed so it is concealed, e.g. partially under a bench,
and is suitable for cabins used in commercial and private settings.
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 unauthorized 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 device does not contain a time-controlled circuit breaker. The con-
trol unit, which ensures an all-pole disconnection of the device, must
control the heating period limitation according to the standard specifi-
cation. It must not be possible to override this time limit.
The cabin volume does not match the heater output.
There is no protective grill mounted above the sauna heater in the
cabin. See 3.3 Dividing wall and protective grill, EN-39.
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.

EN-20 Installation and Operating Instructions - EOS Invisio Midi NA
EN 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 cli-
mate in your sauna.
All temperatures that can be set via the control unit are tested accord-
ing to UL875 or CSA C22.2#60335-1:2016Ed.2 and CAN/CSA E60335-2-
53*AEI.
Note that there is a drop in temperature from the ceiling to the floor of
the sauna cabin. Temperatures are measured and regulated based on
the ceiling values.Thermometers placed below the ceiling will therefore
display lower temperatures. When the max. temperature is set for the
area around the upper sauna bench, the bathing temperature is typi-
cally between 80 °C/176 °F and 90 °C/194 °F.
The first time the cabin is heated, you may notice a slight odor resulting
from the evaporation of consumables used in the manufacturing pro-
cesses. Air out your cabin once it has been heated and before using the
sauna.