Ideal Clima KERS 50 Guide

KERS 50
SINGLE-ROOM HEAT RECOVERY UNIT WITH REMOTE
CONTROL
16
USER & INSTALLATION MANUAL

KERS 50 –Heat recovery ventilation unit –User & installation manual
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READ THIS MANUAL CAREFULLY BEFORE USING THE UNIT
INDEX
index ................................................................................................................................................................ 2
1. INTRODUCTION......................................................................................................................................... 3
1.2 LIABILITY.......................................................................................................................................................................... 3
1.3 STANDARD OPERATIONAL RULES .................................................................................................................................... 4
1.4 OPERATIONS AND MAINTENANCE................................................................................................................................... 4
1.5 USE .................................................................................................................................................................................. 5
1.6 GENERAL SAFETY RULE .................................................................................................................................................... 5
2. PRODUCT DESCRIPTION............................................................................................................................ 6
2.2 STRUCTURE AND OPERATING LOGIC................................................................................................................................ 6
2.3 OPERATING LIMITS .......................................................................................................................................................... 7
3. OPERATION OF MORE UNITS CONNECTED TO EACH OTHER .................................................................. 7
4. ELECTRICAL CIRCUITS ............................................................................................................................... 7
4.1 ELECTRICAL EQUIPMENT.................................................................................................................................................. 7
4.2 WIRING DIAGRAM ........................................................................................................................................................... 8
5. ON BOARD SWITCHES AND REMOTE CONTROL ...................................................................................... 9
5.1 ON BOARD SWITCHES ...................................................................................................................................................... 9
5.2 REMOTE CONTROL......................................................................................................................................................... 10
5.3 DIP SWITCH SETTING ..................................................................................................................................................... 11
5.4 AIRTIGHT SEALING OF THE UNIT .................................................................................................................................... 13
6. TECHNICAL DATA ................................................................................................................................... 14
6.1 MAIN TECHNICAL DATA ................................................................................................................................................. 14
6.2 ENERGY LABEL DATA ..................................................................................................................................................... 15
6.3 DIMENSIONS.................................................................................................................................................................. 15
7. AFTER SALES & MAINTENANCE............................................................................................................... 16
7.1 TROUBLESHOOTING....................................................................................................................................................... 16
7.2 ROUTINE MAINTENANCE ............................................................................................................................................... 16
8. DISPOSAL OF THE UNIT............................................................................................................................ 18
9. UNIT INSTALLATION................................................................................................................................. 18
9.1 PRELIMINARY CHECKS ................................................................................................................................................... 18
9.2 INTENDED USE ............................................................................................................................................................... 18
9.3 EXPLODED VIEW OF THE COMPONENTS ........................................................................................................................ 19
9.4 WALL MOUNTING.......................................................................................................................................................... 19
9.5 FIRST START-UP ............................................................................................................................................................. 22
10. INSTALLATION FROM INSIDE THROUGH FLEXIBLE GRIDS ....................................................................... 23
11. EXTENSION DUCT FOR THICKER WALLS.................................................................................................. 24
12. INTERNATIONAL WARRANTY .................................................................................................................. 25

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1. INTRODUCTION
This manual indicates the intended use of the unit and provides instructions for transportation, installation,
mounting, setting and use the unit. It provides information regarding maintenance, spare parts order, staff
education and residual risks.
The user and maintenance manual must be read and used as follows:
-Each operator involved in the use and maintenance of the unit must read this manual completely and
carefully and respect what it is reported;
-The employer is obliged to ensure that the operator meets the requirements for the conduct of the units
and has taken careful note of the manual; the employer must also inform the operator about the risks of
accidents and in particular about the risks from noise, on provided personal protective equipment and
on general safety rules by laws or international standards of the country of destination;
-The manual must always be available to users, managers, those responsible for transportation, installation,
use, maintenance, repair and decommissioning;
-Keep the manual protected from humidity and heat and treat it as an integral part of the unit for its entire
duration, take it to any other user or successive owner of the unit;
-Make sure that any update received is enclosed in the text;
-Do not damage, remove, tear or rewrite for any reason the manual or parts of it; if it is lost or partially
ruined and you can no longer read its content is recommended to request a replacement to the
manufacturer indicating the serial number of the machine.
Pay attention to the following symbols. Their function is to emphasize essential information like:
With reference to serious and dangerous situations that may occur with the use of the unit to ensure
persons safety.
With reference to dangerous situations that may occur with the use of the unit to prevent damage to
property and to the unit itself.
With reference to additional information or suggestions for proper use of the unit.
The manufacturer has the right to update products and manuals, without any obligation to update previous
versions, except in particular cases.
This manual reflects the technical knowledge available at the time of commercialization of the unit and cannot
be considered inadequate only because later updated according to new technologies.
To require updates or addition to the user manual, which shall be considered an integral part of the manual,
forward the request to the contact details found in this manual.
Contact the manufacturer for further information and for any proposals to improve the manual.
The manufacturer asks, in case of transfer of the unit, to indicate the address of the new owner so to facilitate
the transmission of any new additions of the manual to the new sender.
1.2 LIABILITY
The unit is guaranteed in accordance with the contractual arrangements at the moment of the sale.
The manufacturer is exonerated from any liability and obligation and will cancel the form of guarantee provided
in the contract of sale for any accident to persons or property that may occur due to:
- Non-compliance of the instructions present in this manual regarding the management, use,
maintenance and incidents extraneous to the routine and proper use of the unit

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- Modifications made to the unit and to safety devices without prior written permission of the manufacturer;
- Attempted repair on their own or by not authorized people ;
- Missed periodic and constant maintenance or use of non-original spare parts.
In any case, should the user impute the incident to a defect of the unit, it will have to prove that the damage
has been a major and direct consequence of this "defect".
1.3 STANDARD OPERATIONAL RULES
Service standards described in this manual are an integral part of the supply of the unit.
These rules are intended to the operator already instructed expressly to conduct this type of device and contain
all the information necessary and indispensable for a safe and optimum use of the unit.
Hasty and patchy installations forcing to improvisation and this is the cause of many accidents.
Carefully read and strictly observe the following suggestions:
-the first start-up must be made by qualified staff authorized by the manufacturer;
-during installation or when you need to work on the unit, you must strictly follow the rules reported on this
manual, observe the indications on-board units and take any necessary precautions;
-accidents to persons and property can be avoided by following these technical instructions
compiled with reference to Directive 2006/42 / EC and subsequent amendments. In any case always
observe national safety regulations;
-do not remove or damage protections, labels or notices, especially those required by law and, if
no longer readable, replace them.
All operators must comply with the international regulations and of the destination country of the unit
in order to avoid possible accidents.
The European Community has issued some guidelines concerning the safety and health of workers, among which
include the directives 89/391/CEE, 89/686/CEE, 89/654/CEE, 89/655/CEE, 89/656/EEC, 86/188/EEC, 92/58/EEC and
92/57/EEC that each employer has the obligation to respect and make them respected.
The units have been designed and constructed according to the present state of the art and of the rules of the
art.
Has made compliance with the laws, rules, regulations, ordinances, guidelines in force for such machines.
The materials used and the parts of equipment, as well as production, quality assurance and control procedures
meet the highest requirements of safety and reliability.
Using them for the purposes specified in this user manual, with due diligence and perform accurate maintenance
and revisions, you can maintain continuous and sustained performance and functionality of the unit.
1.4 OPERATIONS AND MAINTENANCE
The user manual can never replace proper and adequate experience; some maintenance jobs are particularly
difficult, this manual is a reminder of the main activities to be performed by personnel with proper training, for
example by attending training courses from the manufacturer.
Carefully read the following suggestions:
-A constant and careful preventive maintenance will always ensure a high operating safety of the
unit. Never postpone necessary repairs and have them performed only by qualified personnel, using
only original spare parts;
-Any work on the unit must be made by qualified personnel;
-Before carrying out any work or maintenance on the unit, make sure to remove the power supply;

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-Make sure that safety devices are working properly and that you have doubts about how they work;
otherwise not start in any case the unit;
-Use only tools specified from the manufacturer. To avoid injury, do not use tools worn or damaged,
poor quality or improvised;
-Once made the cleaning unit, the operator must check that no parts are worn, damaged or not
firmly attached, otherwise request the intervention of the maintenance technician;
-It is forbidden to use flammable fluids for cleaning operations
To clean the unit does not use diesel, petrol or solvents as the first leave an oily film that causes dust adhesion
while solvents (even if weak) damage the paintwork. If a water jet gets inside the electrical devices in addition
to oxidize the contacts, it can cause a malfunction. For this reason never use water or steam jets on sensors,
connectors or any electrical part.
1.5 USE
KERS units are room by room heat recovery, to be installed in the wall, allowing to ventilate a room without
channeling and without loss of heat by the emission of exhaust air.
Its use is recommended within the operating limits shown in this manual.
Place the unit in rooms where there is no danger of explosion, corrosion, fire and where there are
vibrations and electromagnetic fields. It is also forbidden to operate in a different way from that
described or to neglect the illustrated safety tasks.
1.6 GENERAL SAFETY RULE
Use appropriate protective clothing
All operators must use personal protective equipment such as gloves, hard hat, eye goggles, accident
prevention shoes and ear defenders against noise.
Fire extinguisher and first aid kit
Place a first aid kit and a fire extinguisher near the unit.
Regularly make sure that extinguishers are charged and that it is clear the usage
mode.
In case of fire use in accordance with regulations and contact the fire department.
Periodically check that the first aid kit is complete.
Make sure you have nearby telephone numbers for first aid.
The fire extinguisher and first aid kit is responsibility of the owner on which you install the
unit.
Warnings for checks and maintenance
Apply a sign "MAINTENANCE WORK" on all sides of the unit.
Carefully check the unit by following the list of operations described in this manual.
Cleaning instructions

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•Do not use flammable liquids for cleaning purposes.
•Do not clean with oily products as the residue will cause to stick to the unit.
•Do not clean with solvents will cause damage to paintwork
•Do not use water or steam jets on sensors, connectors or any electrical components
Safety labels
Danger High voltage Do not touch Moving parts Risk of getting cut
2. PRODUCT DESCRIPTION
KERS fresh air recovery unit is designed to arrange permanent air exchange in flats, cottages, offices, hotels,
cafes and other residential and public premises.
The unit is equipped with a ceramic heat exchanger that provides extract air thermal energy utilization for
warming up of supply air. The total unit heat recovery efficiency reaches 91%.
The unit is designed for through-the-wall mounting.
The unit telescopic structure makes it suitable for installation in the walls from 240 mm up to 500 mm.
Telescopic ducts allow to overcome bigger wall thickness (see paragraph 9.5).
The low air velocity avoids troublesome currents present in conventional air conditioning systems and guarantees
maximum environmental comfort.
The exclusive use of components of the highest quality and electrical parts puts KERS units at the highest levels
of the state of the art, in terms of efficiency, reliability and reduced noise levels.
2.2 STRUCTURE AND OPERATING LOGIC
The unit is composed of a ventilation unit, a heat exchanger, two filters, an outer protection hood and an outdoor
sound insulating duct.
The duct and the outer insulation can be cut according to the size of the wall.
The two filters and the ceramic core are inserted into the duct. The filters purify the air and prevent dust or other
bodies from entering the room or damaging the heat exchanger or the fan.
The unit is equipped with a non-volatile memory timer, which reports every 90 days of operation the opportunity
to check the filters, through a LED, located on the right side of the unit. Once the filters are replaced or cleaned,
the LED remains off for another 90 days of operation.
The hexagonal cells heat exchanger recovers the heat from the exhaust air in order to heat up the fresh air
coming from outdoor into the room. The ceramic core is equipped with a cord that allows its extraction from the
unit is wrapped in insulating and air-sealing material.
A louver closes automatically when the unit is in stand-by mode, to prevent unwanted draughts.
It is also possible to manually close the cover, as additional insulation to air, such as during holidays.
The ventilation unit must be installed in places where it is not possible the entrance of water or other substances
that could damage its components.
KERS can operate in three modes:
Extract mode: the unit operates continuously in extraction
Supply mode: the unit operates continuously in supply
Heat recovery mode: the unit operates alternately in two phases (supply and extraction) each 65
seconds long.

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Phase 1 - stale and hot air is extracted from the room. While flowing through the heat exchanger ceramic, heats
it. So it moved up to 97% of the thermal energy. In 65 seconds the heat exchanger is heated and the unit switches
to the second phase.
Phase 2 - the fresh air from the outside flows through the heat exchanger ceramic that heats the air to room
temperature. In 65 seconds the ceramic exchanger cools and the unit switches to "Phase 1".
2.3 OPERATING LIMITS
The fan must only be used for indoor applications, with room temperature between -30° and +50° c, with relative
humidity below 97%.
3. OPERATION OF MORE UNITS CONNECTED TO EACH OTHER
When in a room more than one KERS is installed, their operation should be placed in sync so as not to generate
pressure imbalances in the environment. The devices must be connected in series between them (see section:
electrical connection), so that when half of them works in extraction (phase 1), the other half work in supply
(phase 2).
By connecting them in series, only one remote control which operates on the first device (“Master”), can control
all the KERS installed in sync. Also units that operate in separate rooms can be connected in series, on condition
that they have similar requirements between them and can be controlled by the same remote controller.
Up to 10 KERS units can be linked in this way.
4. ELECTRICAL CIRCUITS
4.1 ELECTRICAL EQUIPMENT
The board is constructed and wired in accordance with "Low Voltage”and EMC directive.
The fans, equipped with EC reversible and low-power motors, adjustable between 3.6 W and 5.2 W are extremely
quiet. Once the fan is installed in the properly prepared opening (see section 9.4), connect to a power source
(230 V AC 50 Hz).

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4.2 WIRING DIAGRAM
CONNECTION OF A SINGLE UNIT
The terminal block is protected by a transparent cover as shown in the figure. To access the terminal block see
also section 7.2 of this manual.
The unit is built to work with AC single-phase 230 V/50 Hz.
To power the device use copper cables with a section between 0.5 mm² and 0.75 mm². Place upstream a circuit
breaker with a higher nominal current than required by the device (see technical data table).
WIRING CONNECTION IN SERIES OF SEVERAL KERS (max. 10)
To power the devices (230V single phase 50 Hz) use used copper wires with a section between 0.5 mm² and 0.75
mm². For the control wiring, a shielded 0,25 mm2 will be enough.

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Place upstream a circuit breaker with a higher nominal current than the sum of that required by all the devices
(see technical data table).
When multiple KERS are connected in series, all are managed from the first one (master) and its on board switches
or remote control. To connect in series the units together, connect the "output" terminal of the first KERS to the
terminal strip "input" of the second KERS. In the same way connect the second Kers to the next and so on, up to
a maximum of 10 units.
The first unit KERS (master) controls all the others. The units must be set in a way that half of them begin their cycle
in extraction, and the other half in supply phase, this way the rooms will not be subject to air pressure imbalances.
A series of dip-switch, located under the rubber end cap, allows to set such phases. (See chapter “setting DIP-
switch”).
5. ON BOARD SWITCHES AND REMOTE CONTROL
The unit can be controlled with the on-board switches or with a remote control.
5.1 ON BOARD SWITCHES
Switches on the unit are located on the right side of the device. If you have installed multiple Kers, only the first
(“master”) accepts the commands, either by switches or by remote control.
Control switches are capacitive type, so you will not need to push them.

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The speed button is used to change the speed or to turn off the device. With repeated taps you pass, in
sequence, from minimum speed, average speed, maximum speed, to the appliance is switched off. Three tiny
LEDs next to the button will give feedback about which speed the unit is operating at.
The recovery button activates an intermittent ventilation with heat recovery, visual confirmation is given by the
LED next to the button.
The ventilation button activates continuously the ventilation in only one direction (supply or extraction). The
direction is determined by the position of the dip-switches (see next chapter). The selection confirmation is given
by the LED next to the button.
Note: In this mode no heat recovery will take place.
The LEDs have the following meaning:
Filter: this LED turns on every 90 days and indicates the need to check the filters. For more details on how to clean
or replace the filters, refer to the maintenance section. If multiple devices are connected in series and one of
them requires the replacement of filters, the master unit LED will remain lit while the affected device LED will blink.
This LED goes off as soon as the filters will be replaced.
Alarm: this LED, if on, indicates an internal fault in the device. If multiple devices are connected in series and one
of them has a failure, the master device LED will remain on while the affected device LED will blink.
Master: this LED, if it is on, indicates that the device is deployed as master within a set of devices connected in
series.
When all three LEDs are blinking together, it means that humidity-based control was activated through dip-switch
setting (see also par. 5.3 - DIP SWITCH SETTING), and that the set humidity threshold was reached. During this time
Kers will operate at maximum speed and it will not be possible to change the speed either from remote or from
on-board buttons. Once room humidity is below the set threshold, Kers will revert to the previously set speed.
5.2 REMOTE CONTROL
The operating distance of the remote control may be affected by the environment in which it operates.
Control capabilities of the remote control:
-“ON-OFF”button: it turns on and off the unit. N.B. you can turn the unit on and off only when the
appropriate dip has been correctly set on the machine. For more details, refer to the section "setting of
the dip.”

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-Speed selection button: three buttons allow you to change the fan speed (and its flow). The button with
the darker fan activates the highest speed, and vice versa.
-Ventilation button: the device operates in fan mode only. The air flow direction (supply or extraction) is
determined by the location of the dip two (by default the unit operates in extraction).
-Heat recovery button: it enables the heat recovery. The unit operates for 65 sec in supply and for 65
seconds in extraction. The heat recovery system recovers the energy in sequence from the exhaust flow
into the fresh air supply flow.
-Button party: the device keeps the maximum speed for four hours. After this time, it goes back to the
previously set speed. To disable this function, press any of the three speed buttons.
-Night button: the device will operate at minimum speed for eight hours, after which it will return to the
previously set speed. To disable the function, press any of the three speed buttons
Make sure the remote control is properly powered before the use (charged batteries, free and clean contacts).
The remote control should not be affected by interferences or external EMC noise. The operating range depends
on the external conditions, the level of charge of the batteries and the distance from the unit.
5.3 DIP SWITCH SETTING
The operation mode of the unit can be changed by acting on the dip switches located on board of the device.
To access to these switches, please remove the front panel and lift the rubber cap covering them.
The meaning of each dip-switch is the following:
Dip-switch 1: Possibility to turn off the unit (public buildings)
Position
Description
Turning the ventilator off is allowed
The speed switch position can turn off the fan.
Turning the ventilator off is not allowed
The speed switch cannot turn off the fan altogether, it is only possible to go from
min. speed up to max. speed.
Dip-switch 2: Airflow direction
Position
Description
Air supply
This positioning of the switch enables supply operation of the ventilator in
Ventilation mode. In heat recovery mode, the fan starts operating first in supply
mode.

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Air extraction
This positioning of the switch enables extract operation of the ventilator in
Ventilation mode. In heat recovery mode, the fan starts operating first in extract
mode.
To prevent pressure imbalances in a room, the sequence for the KERS in series can be for example the following:
first KERS = switch to the right; second KERS = switch left; third KERS = switch to the right; fourth KERS = switch left,
and so on.
Switch 3/4/5: Humidity based control
The unit can also work to keep humidity below a certain preset level. This mode is especially useful in all those
rooms where there is no permanent occupation but that may have mold problems due to excessive moisture. In
this case you will get a ventilation focused on solving or preventing the problem with the least electricity
consumption.
To enable this mode, you must use the dip switch 3/4/5 by setting the humidity threshold. The unit continuously
measures the humidity of the air extracted from the environment and if it exceeds the set humidity value, it will
activate the maximum speed. When the room humidity has dropped below the set value, the device will return
to the previously set speed. Before returning to the preset speed, a delay can be set with the dip switch 6 and 7.
Position
Description
Humidity sensor is disabled
Humidity setpoint at 40%
Humidity setpoint at 50%
Humidity setpoint at 60%
Humidity setpoint at 70%
Humidity setpoint at 80%

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Dip-switch 6/7: Setting of delay in regulation based on the ambient humidity
Posizione
Description
No delay
The unit waits for 5 minutes before returning to the previously set speed
The unit waits for 15 minutes before returning to the previously set speed
The unit waits for 30 minutes before returning to the previously set speed
5.4 AIRTIGHT SEALING OF THE UNIT
During periods of inactivity, for example during holidays, you can seal the device and avoid any possible draft:
gently press the front towards the wall. Once closed the unit will turn off automatically.
To open the front panel gently pull it towards you, acting on the handles that are located at the top and bottom
of the device. Once the front panel is opened, the device will reactivate the ventilation at the previously set
speed

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6. TECHNICAL DATA
6.1 MAIN TECHNICAL DATA
Description
KERS 50 heat
recovery
ventilation unit with
remote control
Codice
-
Air flow at maximum speed
mc/h
50
Air exchange
mc/h
25
Heat recovery efficiency
%
Fino a 97%
Noise level at maximum speed (at 1m)
dB(A)
30
Noise level at maximum speed (at 3 m)
dB(A)
21
Noise level at minimum speed (at 1m)
dB(A)
20
Noise level at minimum speed (at 3 m)
dB(A)
11
Temperature working range
°C
-20 / + 50
Electrical power consumption –max
speed
W
5.2
Electrical Current–max speed
A
0,031
On board filters
-
2
Filter class EN 779
G3 (F7 as optional)
Power
V/ph/
Hz
230/1/50
Protection
-
IP 24
Table of flow rates and acoustic performance of Kers
Recuperatore
KERS 50
u.m.
-
Speed III
Air flow in supply/extraction
m3/h
50
Air exchange rate
m3/h
25
Noise level at 1 m
dB(A)
30
Noise level at 3 m
dB(A)
21
Speed II
Air flow in supply/extraction
m3/h
30
Air exchange rate
m3/h
15
Noise level at 1 m
dB(A)
27
Noise level at 3 m
dB(A)
18
Speed I
Air flow in supply/extraction
m3/h
15
Air exchange rate
m3/h
7,5
Noise level at 1 m
dB(A)
20
Noise level at 3 m
dB(A)
11
Acoustic insulation of outdoor noise (fan off)
dB(A)
42

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6.2 ENERGY LABEL DATA
Trade mark
Ideal Clima
Model
VRKS50
Specific energy consumption (SEC),
Cold
Average
Warm
kWh/(m2.a)
-86,5
A+
-41,8
A
-16,0
E
Type of ventilation unit
-------
Bidirectional
Type of drive installed
--------
Multi-speed
Type of heat recovery system
---------
Regenerative
Thermal efficiency t 13°C [t]
%
90%
Maximum flow rate
m3/h
25
Electric power input
W
6
Sound power level
dB(A)
45
Reference flow rate
m3/s
0,04
Reference pressure difference
Pa
0
Specific power input (SPI)
W/(m3/h)
0,28
Control typology
-------
Local demand control
Maximum internal leakage rates
%
2,7%
Maximum external leakage rates
%
2,7%
Mixing rate of bidirectional units
%
1%
Airflow sensitivity at +20 Pa and -20 Pa
m3/h
0,41
The indoor/outdoor air tightness
m3/h
0,49
Internet address
-------
www.idealclima.eu
The annual electricity consumption for
100m2(AEC)
kWh
electricity/a
1,9
The annual heating saved (AHS)
kWh
primary
energy/m2.
a
Cold
Average
Warm
90,4
46,3
21,0
6.3 DIMENSIONS

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7. AFTER SALES & MAINTENANCE
7.1 TROUBLESHOOTING
On the following pages the most common reasons are reported that may cause the unit to stop or to operate
incorrectly. The subdivision is made according to easily identifiable symptoms.
NR
FAILURE
POSSIBLE CAUSES
POSSIBLE SOLUTIONS
1
The unit does not start
No power supply to the unit
Verify its presence in power terminals
The motor is blocked and impeller
is clogged
Turn off the unit. Solve the jam motor,
clean the propellers. Restart the unit
2
Insufficient air flow
It has been set a too low speed.
Choose a higher speed level
The filter, the fan or the heat
exchanger, is dirty
Clean or replace the filters, clean the
fan and the heat recovery (see
“maintenance” chapter).
3
The circuit breaker goes off
A short circuit has produced an
overload
Turn off the unit and contact a service
center
4
Vibrations and noise
The fan is dirty
Clean the fan
5
Vibrations and noise
The screws of the case or of the
outer cap are loose
Tighten the screws of the unit and the
outer cap.
Deformation of the motor unit: the
fan blades touch the duct.
Slightly loosen the screws
7.2 ROUTINE MAINTENANCE
Disconnect the unit from power mains before any maintenance.
A proper operation of the unit requires regular cleaning of filters or their replacement when needed. You should
also clean the fan impeller and ceramic exchanger from any dust that may accumulate over the time.
Follow these steps:
Press simultaneously on the hooks placed to the sides of the front panel and pull it gently toward you to remove
it.
Disconnect the terminal box using a screwdriver. Do not pull the wires to prevent damage to the unit.
Note: Put the front panel back in position only after the actuator has retracted completely at the bottom (wait at
least 5 mins).

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Extract the body of the unit using the supplied string. Remove the filters from the body.
Filters cleaning
Clean the filters when needed, but in any case, not less than once in a year. An on-board LED turns on as a
cleaning reminder.
To reset the filter cleaning timer, power the unit for about 10 seconds, with the green terminal block interrupted
(engine disconnected and circuit board powered).
Clean the filter with water and let them dry. The filters must be reinserted only when they are completely dry. You
may clean the filters with a vacuum cleaner. The filter lifespan, if properly maintained, is about three years.
Ceramic exchanger cleaning
Over time, dust may build up on the ceramic core, even with regular filters maintenance. Clean also the ceramic
heat exchanger to ensure high efficiency of energy recovery. For this operation, we recommend the use of a
vacuum cleaner at minimum speed.
Replacement of the remote-control battery (if necessary)
If the unit no longer responds to the remote control, you may need to replace the battery: gently slide the battery
case on the back of the remote control, you can use a screwdriver. The battery type is CR2505.

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Checking and cleaning of the outside hood
The outside hood might become clogged over time because of leaves or other objects that will reduce the
airflow and consequently the performance of the unit. Check that the external hood is free from obstructions at
least twice a year and clean it according to need.
8. DISPOSAL OF THE UNIT
When the unit reaches its end of life and it needs to be removed and replaced, the structure and
components, if unusable, must be stripped down and recycled according to their basic components.
9. UNIT INSTALLATION
9.1 PRELIMINARY CHECKS
INSPECTION
After receiving the unit, check its integrity: the unit left the factory in perfect condition; any possible damage
must be immediately claimed to the transport company and recorded on the Delivery Note before signing it.
LIFTING AND TRANSPORT
During unloading and positioning of the unit, it is highly recommended to avoid abrupt or violent handling. The
handling should be performed carefully and gently, avoiding to use as strengths points the unit components.
In all lifting operations make sure you have firmly anchored the unit, in order to prevent accidental
toppling or falling.
UNPACKING
The packaging unit must be removed carefully without causing damage to the unit; the materials constituting
the package are different in nature, wood, cardboard, nylon etc.. It is good practice to keep them separately
and deliver them to the disposal or possibly to the recycling companies responsible for this purpose and thus
reduce the environmental impact.
9.2 INTENDED USE
KERS models are designed and built for indoor installation.
Do not install the fan unit outside and make sure it is not exposed to weather such as rain, hail, frost and
humidity.

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9.3 EXPLODED VIEW OF THE COMPONENTS
Assembly drawing
Central body
9.4 WALL MOUNTING
Hole preparation
Drill a hole through the wall with diameter min. 162 mm, inclined outwardly between 2° and 3°.
Telescopic duct insertion
When several KERS are installed in series (see separate section) it is necessary to allow for connecting wires
between a KERS and the others, as well as for the power wire.
The duct must be level with the inside wall (maximum 3 mm overhang) and should protrude from the outdoor
wall for up to 10 mm.
Keep an inclination towards the outside between 2° and 3° to prevent possible condensation could from flow
inward.
Fill the space between the duct and wall hole with insulation material, e.g. with polyurethane foam.

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Positioning installation template
Place on the internal wall the cardboard template supplied with the unit and secure it temporarily (for example,
with adhesive tape). Make sure the hole in the centre of the template is properly aligned with the plastic duct.
Make sure the template is aligned, use a spirit level if necessary. You can then mark the position of the four holes
to be drilled for fixing the front panel to the wall with the provided screws. A fifth hole on the template indicates
the point from where the power wire can come out of the wall (if multiple devices are installed in series, control
wires can go through this same hole). When used in this step, the power cord is hidden from view.
Alternatively, the power cable may enter from fairlead on the underside of the fan, but the wire remains in view.
Installation of the outdoor hood and cover-hood
Go outdoor and perform 4 holes at least 40 mm deep, according to the distances shown in the figure:
Without removing the protective paper, roll up and put in the duct the insulation. Insert once the isolation within
the duct up to the stop. Mark on the circumference of the insulation the part to be removed so that it is flush with
the wall. Pull out the insulation and cut off excess part. Then insert back the insulation in the duct.
Remove the grid-cover from the grill by sliding it upwards.
Screw the grid to the outside wall using the 4 plug screws 4 x 40 mm (supplied with the unit).
Re-mount the grid-cover sliding it down along the outside grill.