Innova HRA-I PLUS Operating instructions

INSTALLATION, USER AND MAINTENANCE MANUAL
HRA-I PLUS
The compact aggregate for heating, cooling and air renewal in
nZEB homes

Innova S.r.l.
Page 2 HRA-I SLIM MANUAL
CONTENTS
1GENERAL INFORMATION .................................................................................................................................................................. 4
1.1 INTRODUCTION ....................................................................................................................................................................... 4
1.1.1 ESSENTIAL SAFETY RULES .................................................................................................................................... 4
1.2 SYMBOLS USED........................................................................................................................................................................ 5
1.3 WARNINGS .............................................................................................................................................................................. 5
1.4 CONFORMITY........................................................................................................................................................................... 6
1.5 RANGE ..................................................................................................................................................................................... 6
1.6 IDENTIFICATION .......................................................................................................................................................... 6
1.7 CONSTRUCTION FEATURES ..................................................................................................................................................... 7
1.8 MAIN COMPONENTS OF THE UNIT ......................................................................................................................................... 7
1.9 PACKAGING AND TRANSPORT................................................................................................................................................. 9
1.10 RECEPTION, INSPECTION AND HANDLING ............................................................................................................. 9
1.11 DISMANTLING AND DISPOSAL ................................................................................................................................. 9
2INSTALLATION ................................................................................................................................................................................. 10
2.1 INSTALLATION CONDITIONS ..................................................................................................................................... 10
2.2 POSITIONING OF THE UNIT .................................................................................................................................... 10
2.3 CONNECTING THE CONDENSATE DISCHARGE OUTLET .......................................................................................... 12
3AERAULIC CONNECTIONS................................................................................................................................................................ 13
3.1 AERAULIC ARRANGEMENTS ..................................................................................................................................... 13
4ELECTRICAL CONNECTIONS............................................................................................................................................................. 14
4.1 GENERAL INFORMATION ........................................................................................................................................... 14
4.2 POSITIONING AND PROCEDURES OF THE CONNECTIONS ..................................................................................................... 14
4.3 REMOTE PANEL CONNECTION ............................................................................................................................... 15

Innova S.r.l.
Page 3 HRA-I SLIM MANUAL
4.4 WIRING DIAGRAM ................................................................................................................................................. 16
4.5 CONNECTIONS ....................................................................................................................................................................... 17
5COMMISSIONING AND MODES OF USE .......................................................................................................................................... 18
5.1 CONTROL PANEL OPERATION................................................................................................................................................ 18
5.2 SWITCHING THE UNIT ON AND OFF ...................................................................................................................................... 18
5.3 MODIFYING THE TEMPERATURE SET-POINT ......................................................................................................................... 19
5.4 MODIFYING THE FAN SPEED.................................................................................................................................................. 19
5.5 NOMINAL SPEED FUNCTION ............................................................................................................................................. 19
5.6 SEASON CHANGE ................................................................................................................................................................... 19
5.7 DESCRIPTION OF THE AIR QUALITY SENSOR’S OPERATION................................................................................................... 20
6MAINTENANCE................................................................................................................................................................................ 20
6.1.1 FILTER CLEANING AND REPLACEMENT ............................................................................................................................. 20
6.1.2 CLEANING THE HEAT EXCHANGER .................................................................................................................................... 20
6.2 GENERAL CLEANING OF THE UNIT......................................................................................................................................... 21
7ALARMS........................................................................................................................................................................................... 22
7.1 GENERAL INFORMATION ....................................................................................................................................................... 22
7.2 PROBLEMS WITHOUT THE ERROR MESSAGE APPEARING ON THE DISPLAY ......................................................................... 22
7.2.1 TABLE OF ALARMS SIGNALLED ON THE DISPLAY .............................................................................................................. 24
8NOTES AND INFORMATION MAINTENANCE................................................................................................................................... 25
NOTES ............................................................................................................................................................................................. 25

Innova S.r.l.
Page 4 HRA-I SLIM MANUAL
1GENERAL INFORMATION
1.1 INTRODUCTION
This manual is drawn up to make the installation and running of your system as easy as possible.
Reading and applying the suggestions contained in this manual will enable you to obtain optimal performances from the product you
have purchased.
We would like to thank you for purchasing our product.
Carefully read this brochure before carrying out any operation on the unit.
You must not install the unit nor perform any intervention on it unless you have carefully read and understood all parts of this
manual. More specifically, it is necessary to adopt all the precautions listed in the manual.
The documentation accompanying the unit must be handed to the person in charge of the plant who must store it carefully (for at
least 10 years) for any future assistance activities, maintenance and repairs.
The unit’s installation must take into account purely technical requirements to ensure its optimal operation, as well as any applicable
local regulations and specific provisions.
When the unit is delivered, make sure that there are no evident signs of damages caused by transport. Should these be present,
signal them on the delivery note.
This manual reflects the state of the art at the time the machine is commercialised and cannot be deemed inadequate if new findings
subsequently update its contents. The Manufacturer reserves the right to update its products and the relevant manuals, without
updating the previous versions thereof, unless in exceptional cases.
Contact the Manufacturer’s Sales Department to receive further information on or updates to the technical documentation and for
any improvement proposal of this manual. All notifications received will be rigorously assessed.
1.1.1 ESSENTIAL SAFETY RULES
We remind the user that the use of products relying on electricity and water implies the observance of a few essential safety rules:
•Incapable or unassisted people are forbidden from using the device.
•It is forbidden to touch the device with bare feet and with wet or damp parts of the body.
•It is forbidden to clean the device without having first disconnected it from the mains electricity by shifting the plant’s main
switch to off.
•It is forbidden to modify or adjust the safety devices without being authorised and instructed by the device’s manufacturer.
•It is forbidden to pull, detach or twist the power cables coming out of the device, even if the latter is disconnected from the
mains electricity.
•It is forbidden to introduce objects and substances through the air intake and delivery grilles.
•It is forbidden to open the doors allowing access to the internal parts of the device without having first shifted the device’s
main switch to off.
•It is forbidden to disperse the packaging material and leave it within reach of children, as it is a potential source of danger.
•Leave the machine at a safe distance from other devices or structures so that there is enough space for accessing the unit
for performing maintenance and assistance activities, as explained in this manual.
•The unit must be powered with power cables of suitable cross-sectional size in relation to the unit’s power rating. The
voltage and frequency values must match those indicated for the respective machines; all machines must be earthed in
accordance with the regulations in force in the relevant countries.
•-Do not release R410A into the atmosphere: R410A is a fluorinated greenhouse gas, mentioned in the Kyoto Protocol, with
a global warming potential (GWP) = 1975.

Innova S.r.l.
Page 5 HRA-I SLIM MANUAL
1.2 SYMBOLS USED
The symbols appearing in this brochure provide instant information required for using the unit correctly.
Safety-related symbols
BEWARE
Authorised persons only Warns that the indicated operations are important for the safe operation of the machines.
DANGER
Risk of electric shocks Warns that the failure to observe the instructions implies the risk of electric shocks.
DANGER Warns that the failure to observe the instructions can potentially harm exposed persons.
WARNING Warns that the failure to observe the instructions implies the risk of damaging the unit or
plant.
DANGER Warns that the presence of moving parts can potentially harm exposed persons.
1.3 WARNINGS
The unit must be installed by qualified personnel authorised in accordance with the regulations in force in the various
countries. If the installation is not carried out, a potentially dangerous situation may occur.
Avoid installing the unit in rooms that are very damp or have large sources of heat.
On the electrical side, to prevent any possible risk of electrocution, the main switch must be disconnected prior to making
the electrical connections and performing maintenance operations.
If water leaks inside the unit, shift the plant’s main switch to “Off”, close the water taps and contact the technical assistance
service.
We recommend using a dedicated power supply circuit; never use a power supply source shared with other devices.
We recommend installing a discharge to earth switch; failing to install this device could cause electric shocks.
For the connection, use a cable that is long enough to cover the entire distance, without any connection; do not use
extension cords and do not apply other loads on the power supply, but use a dedicated power supply circuit.
After connecting the electrical cables, make sure that the cables ar
e arranged in a way that they do not exert excessive force
on the covers or electrical panels; the incomplete connection of the covers can cause overheating of the terminals.

Innova S.r.l.
Page 6 HRA-I SLIM MANUAL
Make sure that the device is earthed; do not earth the device on distribution pipes.
Temporary high-intensity overcurrents could damage the unit.
Installation carried out without observing the precautions stated in this manual or use of the device that disregards the
operating limits shall cause the immediate voiding of the warranty.
Make sure that the initial start-up is carried out by personnel authorised by the company (see the initial start-up request
form).
1.4 CONFORMITY
The CE marking (present on every machine) certifies conformity to the following European directives:
•Low-Voltage Directive 2014/35/EC
•Electromagnetic Compatibility Directive 2014/30/EC
1.5 RANGE
-1-
HRA-i
PLUS
50 / 08
(1) Defines the total flow rate and the flow rate of the renewal air
Model 50/08 = 500 m3/h total flow rate, of which 80 m3/h renewal air flow rate
Model 50/15 = 500 m3/h total flow rate, of which 150 m3/h renewal air flow rate
1.6 IDENTIFICATION
-The unit is identified by its identification plate affixed to the lower front panel of the unit itself.
-The packaging contains an additional identification plate with the model of the unit and the shipment references.
The plate on the packaging cannot be used to trace the product in the years following its sale.
The removal, deterioration and illegibility of the identification plate affixed to the unit implies serious problems for identifying the
machine, finding spare parts and thus for any future maintenance activities.

Innova S.r.l.
Page 7 HRA-I SLIM MANUAL
1.7 CONSTRUCTION FEATURES
ALL-IN-ONE:
A complete unit capable of renewing the air and integrating the heating and cooling requests of
the rooms served. The unit is complete in every component for its operation and is ready for use.
RECOVERY SECTION: High-performance polypropylene heat exchanger with counter-flow criss-cross flows.
Low freezing temperatures and operation up to –25°C.
High exchange efficiency.
VENTILATION: Centrifugal fans with forward-curved blades and brushless motor directly coupled, with constant-
volume function.
ACTIVE THERMODYNAMIC RECOVERY:
The unit ensures the passive and active recovery of the energy of the expelled air. Thanks to its
cooling circuit,
thermodynamic recovery ensures a larger amount of energy supplied to the room
compared to that subtracted through ventilation.
FILTRATION:
Upstream of the recovery unit there is a ePM1 filter on the incoming air and an ePM1 filter on the
expulsion air with low head loss.
STRUCTURE: Self-supporting sheet metal frame.
Galvanised sheet metal sandwich panels, coated externally, with polystyrene insulating layer in
between, and internal filler panels made of high-thickness galvanised sheet metal.
COOLING CIRCUIT: Made of brazed copper complete with: High-
efficiency BLDC inverter compressor, dehydrator
filter, finned batteries, electronic expansion valve and safety devices.
ADJUSTMENT: Electrical panel on board the unit with
microprocessor and dedicated adjustment device.
Management of fans, temperature visualisation and set-point, and timer-
based management of
dirty filters;
Optimised defrosting algorithm management for operation with low outdoor temperatures;
Panel with graphic interface and Wi-Fi with connection up to 8 m from the unit.
.
1.8 MAIN COMPONENTS OF THE UNIT

Innova S.r.l.
Page 8 HRA-I SLIM MANUAL
1 Compressor
2 Room inlet fans
3 General expulsion fan
4 MVHR expulsion fan
5 MVHR outdoor air fan
6 MVHR heat exchanger
7 Outer-side battery
8 Inner-side battery
9 Electrical panel
10 MVHR extraction filter
11 MVHR outdoor air filter
12 Recirculation filter

Innova S.r.l.
Page 9 HRA-I SLIM MANUAL
1.9 PACKAGING AND TRANSPORT
The units are handed to the forwarder secured to a wooden pallet and inserted in cardboard boxes. To facilitate shifting operations,
the units have a wooden pallet and fastening devices on the base for lifting and positioning the unit in its installation site. The unit
can be stored in a room protected against atmospheric elements at temperatures not below 0°C and up to maximum 40°C.
1.10 RECEPTION, INSPECTION AND HANDLING
The unit is shipped completely pre-charged with refrigerant gas in the circuits and non-freezing oil in the compressors. In no case
can there be water in the hydraulic circuits, as the unit is thoroughly emptied after the testing phase. Upon the unit’s arrival, the
customer must inspect also the internal zones to verify that no damage was caused during transport; the unit leaves the factory in
perfect condition. If damages are found, the transporter must be informed immediately by reporting in detail the entity of the
damage on the delivery note, producing photographic evidence of the apparent damage and notifying the apparent damage to the
forwarder via registered letter with return receipt requested. The manufacturer shall not be held liable for transport-related damages
even if the manufacturer itself shipped the product. The unit must be handled very carefully during its unloading and positioning on-
site, so as to avoid damaging the casing and the more delicate internal components such as the compressors, heat exchangers, etc.
At all events, keep the unit positioned horizontally without tilting it. All indications regarding the precautions to be applied for
preventing damages to the unit and the indication of the weight of the unit itself also appear on the packaging. The packaging can
have various types of constituent materials, including wood, cardboard or polyethylene (plastic). It is good practice to send them to
the waste disposal facility or recycling centre through specialised companies in order to reduce their environmental impact.
1.11 DISMANTLING AND DISPOSAL
Do not dismantle or dispose of the product autonomously. The dismantling, demolition and disposal of the product must be carried
out by authorised personnel in conformity to the local regulations.

Innova S.r.l.
Page 10 HRA-I SLIM MANUAL
2INSTALLATION
2.1 INSTALLATION CONDITIONS
The unit must be installed according to the national and local regulations governing the use of electrical devices and on the basis of
the following indications:
install the unit inside residential buildings with a room temperature between 0°C and 45°C;
avoid installing the device in areas near sources of heat, steam, flammable and/or explosive gases and particularly dusty areas;
install the unit in a spot not subject to frost build-up (the condensate water must be discharged non-frozen, at a certain inclination,
using a siphon);
do not install the unit in zones subject to high relative humidity (such as bathrooms and WCs) to prevent condensate building up on
its outer surface;
choose the installation site so that there is enough space around the unit for connecting the air pipes and for performing
maintenance interventions;
the consistency of the ceiling/wall/floor where the unit will be installed must be adequate to the weight of the unit and not cause
vibrations.
The chosen installation site must have the following:
-connections for the air pipes;
-230 V single-phase electrical connection;
-connection for condensate discharge.
2.2 POSITIONING OF THE UNIT
Ceiling-mounted installation
For mounting the unit on the ceiling it is necessary to:
Position 4 threaded bars inside the brackets arranged on
the 4 corners of the unit.
Fasten the unit to the ceiling by means of the brackets,
using suitable anchoring systems (plugs, chains, etc.),
and check its levelling with the aid of a spirit level.
Make sure there is enough space for performing
maintenance activities: it must be possible to open the
unit’s cover (from below).
Avoid mounting the unit with the side panels directly in
contact with the walls so as to prevent possible noises
from the contact: insert rubber or neoprene strips in this
case.
Ceiling-mounted installation

Innova S.r.l.
Page 11 HRA-I SLIM MANUAL

Innova S.r.l.
Page 12 HRA-I SLIM MANUAL
Floor-mounted installation
For mounting the unit on the floor it is necessary to:
Position 4 threaded bars inside the brackets arranged
on the 4 corners of the unit.
Fasten the unit to the floor by means of the brackets,
using suitable anchoring systems (plugs, chains, etc.),
and check its levelling with the aid of a spirit level.
Make sure there is enough space for performing
maintenance activities: it must be possible to open the
unit’s cover (from below).
Avoid mounting the unit with the side panels directly in
contact with the walls so as to prevent possible noises
from the contact: insert rubber or neoprene strips in
this case.
Floor-mounted installation
2.3 CONNECTING THE CONDENSATE DISCHARGE OUTLET
Due to the heat recovery system (the hot air being
expelled is cooled by the air entering the heat
exchanger) and the dehumidification batteries, the
humidity in the internal air condenses within the unit.
To ensure the correct operation of the heat recovery
unit, therefore, it is necessary to connect two
condensate discharge outlets to the home’s plumbing
system (drain). Moreover, to ensure the correct
drainage of the condensate water and avoid air
suction, the condensate discharge outlets must be
fitted with appropriate siphons to be supplied and laid
by the installer.
Make the two separate siphons before joining the
condensate discharge outlets.
Observe the following rules when installing the
condensate discharge outlet:
•slope the discharge pipe by at least 2%;
•arrange for disconnecting the discharge pipe
for maintenance operations (especially in the
ceiling-mounted version);
•make sure that the discharge end of the pipe
is at least below the water level of the siphon;
•make sure that the siphon is always full of
water.
•measurement H shown in the adjacent picture
must be at least H = 50 mm.
Condensate discharge outlet connection

Innova S.r.l.
Page 13 HRA-I SLIM MANUAL
3AERAULIC CONNECTIONS
3.1 AERAULIC ARRANGEMENTS
The unit is equipped with 4 round rear male fittings with different Ø and a rectangular mouth on the front depending on the size;
In order to correctly connect the air pipes, refer to the following diagram and to the stickers on the unit.
Table of diameters for the unit’s aeraulic connections
Unit
Diameter
Ø Outdoor air mm
200
Ø Expulsion mm
200
Ø Inlet mm
700 x 140
Ø Stale air mm
160
Ø Recirculation
160
We recommend installing a flexible pipe measuring at least 500 mm in order to avoid vibration-related dragging and bothersome
noises due to the installation.
Air flow configurations
HRA-i PLUS CONFIGURATION
VIEW FROM ABOVE

Innova S.r.l.
Page 14 HRA-I SLIM MANUAL
4ELECTRICAL CONNECTIONS
4.1 GENERAL INFORMATION
-Prior to starting any operation for making the electrical connection, make sure that the unit is not electrically powered.
-Make the necessary electrical connections by exclusively consulting the wiring diagram enclosed with this manual.
-Install a suitable residual-current circuit breaker serving the unit alone.
-The unit must be connected to an earthing socket.
-Check that the electrical components chosen for the installation (main switch, magnetothermic switches, cable cross-sectional areas
and terminals) are suitable for the electrical power of the unit installed and that they account for the compressor’s inrush currents as
well as the maximum allowed load. The relative data appears in the enclosed wiring diagram and on the unit’s identification plate.
-It is forbidden to enter the unit with the electrical cables except for the areas specified in this brochure.
-Use electrical cables and wires of adequate cross-sectional size and conforming to the regulations in force in the various countries.
-Strictly avoid feeding the electrical cables directly in contact with piping or components inside the unit.
-Check the tightness of the screws of the power supply terminals after the initial moments of operation.
Table for the sizing of the power supply line.
SIZE
50/08
50/15
Power supply
V/Ph/Hz
230/1/50
230/1/50
Max current draw
A
9.5
9.8
4.2 POSITIONING AND PROCEDURES OF THE CONNECTIONS
The inlet for the electrical cables is l
ocated on
the side of the unit;
There are two openings measuring DN 20 mm;
Moreover, in the lower part, the electrical panel
can be reached through a dedicated door;

Innova S.r.l.
Page 15 HRA-I PLUS Manual
4.3 REMOTE PANEL CONNECTION
Remote panel connection
The circuit board has a capacitive touch-
type remote control panel for managing
all the unit’s functions, configured for
installation of box 503 on the wall or
outside.
For the connection, a pre-wired cable
with plug-in connection is supplied both
for the unit’s board and for the display.
The remote panel differs for the ModBUS
communication port or Wi-Fi, black or
white version:
•ECA031II - SMART TOUCH wall-
mounted control panel with thermostat
and room probe with integrated Wi-Fi
module. BLACK finish.
•ECB031II - SMART TOUCH wall-
mounted control panel with thermostat
and room probe with integrated Wi-Fi
module. WHITE finish.
•ECA032II - SMART TOUCH wall-
mounted control panel with thermostat
and room probe with ModBUS serial
port. BLACK finish.
•ECB032II - SMART TOUCH wall-
mounted control panel with thermostat
and room probe with ModBUS serial
port. WHITE finish.
Remote panel with 8-metre connection cable

Innova S.r.l.
Page 16 HRA-I PLUS Manual
4.4 WIRING DIAGRAM

Innova S.r.l.
Page 17 HRA-I PLUS Manual
4.5 CONNECTIONS
N-L-PE – POWER SUPPLY
The unit is supplied with a power plug
connected to the N, L, PE terminals.
HT- EXTERNAL HEATER
Entails the connection of the
supplementary heater (accessory) to be
inserted on the air delivery channel.
CP- REMOTE ON / OFF
Entails an external connection for
enabling the unit as a presence contact
or window; is supplied with a bridge.
Connections
The remote panel as described above is
connected through the cable provided to
the unit which has a white plug-in
connector on the back of the display.
The cable is pre-wired on the unit and
simply needs to be inserted in the panel
for connecting the devices.
The panel houses a communication
board for interacting with the unit
through the Modbus RTU protocol.
To connect the modbus board, it is
necessary to remove the Wi-Fi board
and insert the modbus board supplied.
The connections for the modbus are
indicated with A (+) and B (–).
•ECA031II - SMART TOUCH wall-mounted
control panel with thermostat and room
probe with integrated Wi-Fi module. BLACK
finish.
•ECB031II - SMART TOUCH wall-mounted
control panel with thermostat and room
probe with integrated Wi-Fi module. WHITE
finish.
ECA032II - SMART TOUCH wall-mounted
control panel with thermostat and room
probe with ModBUS serial port. BLACK
finish.
•ECB032II - SMART TOUCH wall-mounted
control panel with thermostat and room
probe with ModBUS serial port. WHITE
finish.

Innova S.r.l.
Page 18 HRA-I PLUS Manual
5COMMISSIONING AND MODES OF USE
5.1 CONTROL PANEL OPERATION
The unit is controlled in a fully manual
way by the user through the wall-
mounted touch control panel.
ECA031II - SMART TOUCH wall-mounted control panel with thermostat and room probe
with integrated Wi-Fi module. BLACK finish.
ECB031II - SMART TOUCH wall-mounted control panel with thermostat and room probe
with integrated Wi-Fi module. WHITE finish.
ECA032II - SMART TOUCH wall-mounted control panel with thermostat and room probe
with ModBUS serial port. BLACK finish.
ECB032II - SMART TOUCH wall-mounted control panel with thermostat and room probe
with ModBUS serial port. WHITE finish.
Indicated below are the buttons
present on the main display:
Meaning of the buttons of the main display:
Used to switch the unit
on or off from the
keypad
Button for modifying the
temperature set-point
Buttons for selecting the
ventilation speed:
silent / nominal /
maximum
Button for summer / winter
selection
Button for auto speed
operating mode in
relation to the
temperature
ALARM message
Buttons appearing on the main display
5.2 SWITCHING THE UNIT ON AND OFF
-The unit can be enabled and disabled using the On / Off button present on the display.
Unit On / Off button

Innova S.r.l.
Page 19 HRA-I PLUS Manual
5.3 MODIFYING THE TEMPERATURE SET-POINT
-The display contains buttons for selecting the desired temperature for the unit.
Whenever the temperature set-point is modified, the display shows the desired temperature for 1
minute.
After the minute elapses, the display will once again show the measured room temperature.
Temperature set-point
modification
5.4 MODIFYING THE FAN SPEED
-The display contains buttons for selecting the desired speed for the unit.
Whenever the speed is selected, the fan speed is actually modified after 1 second.
-Three different speeds can be selected:
night-time (minimum speed) – nominal (medium speed) – maximum (maximum speed)
The main fans are constant-volume devices, therefore they adapt their number of revolutions in relation
to the ducting configuration, installation and cleanliness of the filter to reach the pre-defined flow rate.
Fan speed management
5.5 NOMINAL SPEED FUNCTION
-By setting this operating mode the device will be configured for functioning in automatic mode.
Depending on the set temperature, the unit automatically selects the operating mode (cooling or
heating) and the ventilation speed on the basis of the temperature of the room and the air quality value
measured.
AUTO function
5.6 SEASON CHANGE
-The season must be made changed from the keypad;
Press and hold the season change button for at least 3 seconds to modify the season status;
The operation must be carried out in order to activate the correct procedures:
in winter the anti-freeze function and in summer the by-pass function.
Meaning of the symbols: SUN - WINTER SNOWFLAKE - SUMMER
Season change

Innova S.r.l.
Page 20 HRA-I PLUS Manual
5.7 DESCRIPTION OF THE AIR QUALITY SENSOR’S OPERATION
-The operation of the fans on the unit depends on the chosen speed and the internal procedures linked
to the measured air quality value; for every speed, if the air quality is not optimal, the fans increase the
flow rates for increasing air change and improving the quality of the indoor air.
6MAINTENANCE
To constantly guarantee that the unit works correctly and optimally, all the maintenance interventions must be carried out
periodically.
6.1.1 FILTER CLEANING AND REPLACEMENT
To replace the filters, or to clean them, proceed as follows:
disconnect the power supply to the unit;
open the filter covers through the 4 dedicated covers;
remove the 4 dirty filters;
gently insert the new filters;
put the covers back on while making sure that they are fully closed to prevent
air from escaping;
if the filters are in the right condition, they can be cleaned using a vacuum
cleaner or low-pressure compressor.
View for removing the 4 filters
6.1.2 CLEANING THE HEAT EXCHANGER
We recommend inspecting the condition of the heat exchanger whenever the
filter is cleaned/replaced and cleaning it if necessary. This operation must be
carried out exclusively by qualified personnel (installer).
To clean the heat exchanger, proceed as follows:
disconnect the power supply to the unit;
open the unit’s cover by removing the screws;
clean the heat exchanger very gently using a vacuum cleaner or low-pressure
compressor (to prevent dirt from entering the heat exchanger, clean it in the
opposite direction to the air flow);
close the cover again by locking it in place and inserting the screws.
Warning! Never touch the heat exchanger fins, handle the heat exchanger by
gripping it only on the closed sides.
View for extracting the heat exchanger