Aereco DXA 230 PREMIUM Technical specifications

INSTALLATION AND MAINTENANCE INSTRUCTION (ENGLISH VERSION)
dx system
DXA 230 PREMIUM
Heat recovery unit with demand control for cupboard installation
TF6400_A Aereco S.A.

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TF6400_A Aereco S.A.
1. Introduction 3
1.1. Warnings 3
1.2. Pictograms 3
2. Description 4
2.1. General information 4
2.2. Construction / Dimensions 6
2.3. DXA Assembling 6
3. Installation 7
3.1. Location of the installation 7
3.2. DXA Unit 7
3.2.1. Location 7
3.2.2. Accessibility 8
3.2.3. Fixing of the DXA Unit 8
3.2.4. Duct connections to the DXA Unit 10
3.2.5. Evacuation of condensates 11
3.3. Exhaust compensation valve (MCP 125) 12
3.4. Defrosting 13
3.5. Sensors 14
3.5.1. Presence sensors (DX S-PRE) 14
3.5.2. C02sensors (DX S-CO2) 14
3.6. DXA user’s interface 15
3.7. Special care for the ductwork 16
3.8. Fire protection 16
4. Electrical connections 17
4.1. Electrical connection on the DXA Unit 18
4.2. Electrical connection of the defrosting 19
4.3. Electrical connection of the condensate pump (optional) 19
5. Starting and settings of the DXA 20
6. Maintenance 20
6.1. Regular maintenance of the installation 20
6.2. Fuse 20
6.3. Replacement of supply cable 20
6.4. Power supply and motor material protections 21
6.5. Filters 21
7. Troubleshooting 22
8. Acceptance of works 23
8.1. Visual inspection 23
8.2. Measurements 23
9. Specific recommendations for airtightness and insulation of the installation 24
9.1. Insulation of the installation 25
9.2. Airtightness of the installation 25
10. Supply and exhaust units 27
10.1. Supply units 28
10.2. Exhaust units 28
10.3. Fresh air inlet and exhaust air outlet 29
11. Environmental concerns 29
12. Warranty 29
13. Conformity and standard 29
14. Characteristics 30

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1.1. WARNINGS
PLEASE READ THE FOLLOWING INSTRUCTIONS BEFORE THE
INSTALLATION:
In case of non-compliance with advice and warnings contained
in this manual, the manufacturer can not be considered
responsible for damages to persons or property.
The manual describes how to install, use and maintain correctly
the appliance. The only way to ensure the eciency and longevity
of the product is to comply with these requirements.
Do not use this appliance for any applications for which it is not
intended.
The system must be installed by experienced contractors, trained
in the specificities of the process and having the necessary skills
in aeraulics and electricity.
The use of gloves to carry on the installation is recommended.
After unpacking the appliance, make sure it is not damaged. Any
functional default must be reported to your reseller.
The use of an electrical appliance implies the following
fundamental rules:
· Do not touch the appliance with a wet or damp body (hands, feet,
etc.).
· This appliance is not intended for use by persons (including
children) with reduced physical, sensory or mental capabilities,
or lack of experience and knowledge, unless they have been
given supervision or instruction concerning use of the appliance
by a person responsible for their safety. To avoid any risk, do not
allow them to play with the appliance.
· The electrical installation and electrical connections must
be carried out by a qualified technician according to the
manufacturer’s instructions and in compliance with the
characteristics listed on the nameplate of the unit.
· Before carrying out any operation on the appliance, unplug or
disconnect it from the power supply, and ensure it can not be
accidentally restored.
· Power cable modification or replacement must only be carried
out by qualified personnel or by After-sales Service in order to
avoid any accident.
· Children being supervised not to play with appliance.
1.2. PICTOGRAMS
Warnings
Risks of:
· Appliance damage
· Bad eciency and longevity of the appliance.
Risk of electric shock.
Electrical component: ground.
1. INTRODUCTION
This document presents the installation and maintenance schemes for the whole system.

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The Heat Recovery Unit : DXA Unit
The DXA has been specifically designed for
wall or cupboards installation. Thanks to
its wellfitted dimensions, the DXA can be
installed in technical rooms, wallmounted.
A creamy white metal sheet covers the front
face of the the DXA which allows it to be
unnoticed as a technical equipment. The DXA
unit is compatible with two demand control
strategies used in the DX System “Premium”
and “Excellence”.
2. DESCRIPTION
2.1. GENERAL INFORMATION
The DX System is a range of smart heat recovery ventilation systems that continually supply pollen-free and dust-free preheated fresh air to living areas,
ensuring a comfortable feel-good climate.
The DXA is a heat recovery unit with demand-controlled airflows for vertical installation (on the wall) in the apartment or in the house, from 2to 5 main
rooms, and from 1 to 5 technical rooms (kitchen, bathroom, others wet rooms). The dwelling has to be limited to 2 floors (1 ground floor and 1 floor
maximum), and has a maximum surface of 210m². This HRVsystem can also be used in oces, hostels, etc., if the required airflow is in accordance
with the one oered by the system.
General working of the DX System, Premium Version
The DXSystem is comprised of a heat recovery unit (DXA Unit 1 ) con-
nected to exhaust and supply ductworks. The counter-flow heat exchanger,
integrated into the main unit, ensures the recovery and transfer of most of
the energy from the exhaust air to the supply air, thus limiting the energy
required to heat the fresh air.
Airflows are automatically controlled according to the needs of each
dwelling’s room: a room by room DCV is ensured on the exhaust side while
on the supply side, airflow are managed globally by the mean of one or
several indoor air quality sensors 4. Preheated 8fresh air is supplied
3in the bedrooms and in the living room. Stale air is extracted 5from
the kitchen, bathroom and WC. To manage supply airflows, one or several
C02or presence sensors 4drive the exhaust compensation valve. If
several sensors are connected, a weighted average of the ventilation need
is calculated by the system to adap the airflow. With this strategy, the
exhaust airflow 5increase depending on the sensors measurement,
which will drive consequently the supply airflows. Supply airflows, as
they are distributed through a passive distribution box 2, are identical
in all the dierent main rooms (to the nearest drop pressure losses). On
the exhaust side, the exhaust units 5 adjust automatically the airflow,
according to parameters read by various sensors: humidity (used in the
kitchen, in the bathroom and in WC), presence (used in WC). Versions
with switch, presence, remote, CO2or VOC sensors can also be used for
exhaust units. In order to have a balanced system, supply airflows are
similar to exhaust airflows.
The use of an exhaust compensation valve 7 , connected to a specific
supply unit 6 , is also a solution to increase the airflows. This scenario
is used in order to get a very ecient over-ventilation mode, also called
free-cooling mode.
Supply airflows and exhaust airflows are measured by the use of accurate
pressure sensors placed in the heat recovery unit. This allows to calculate
with a high accuracy supply and exhaust airflows, without influence of
clogging filters or ductwork pressure drop. It ensures the highest eciency
for the system. So that, energy savings are at their maximum.
CO2 detection
Based on the level of CO2in the room, a
consequence of people occupancy, CO2
sensors are a really good indicators to
modulate the supply airflows, and allow reliable
measurement of the concentrations of CO2
in a zone. The analysis principle consists in
measuring the absorption of infrared light in
order to determine the concentration in a room.
This method gives a very accurate response
and is not aected by any other pollution
(humidity, dust, etc.).
Presence detection
The presence sensors located in the main rooms
(at least 1 sensor in one or several main rooms)
send the information to the system (presence
detected or not) with a timer that depends on
the period through luminosity measurement
(day or night). This timer keeps the detection
at the maximum level during 20 or 45 minutes
after the last detection, to optimize the quality
of detection. Timer day = 20 min ; Timer night
= 45 min. When there is detection, the local
supply airflow is increased to ensure the best
air quality. If there is no detection, the local
supply airflow is reduced to optimize energy
savings.

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1
3
33
3
8
34
9
9
10
4
4
4
2
5
76
5
Typical apartment equipped with the DXA Premium system
DXA Unit
1Distribution box (not specific) 2
Passive distribution box for supply airflows (no control)
BXC b
6
Exhaust unit for balance
Interface
Heat recovery unit with balanced demand controlled airflows
Preheater
8
Galvanised steel body
with built-in resistance
MCP 125
7
Exhaust compensation valve
S-CO2
4
CO2 sensor
SDC 100
3
Supply unit
S-PRE
Presence sensor
Air intake and outlet grilles
9
BXC
5
Exhaust units (various sensors)
RJ 12 - RJ 45 cables
Acoustic attenuation
10
List of components
supply aiflows
exhaust aiflows
technical room

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Dimensions of DXA Unit (mm)
2.2. CONSTRUCTION / DIMENSIONS
DXA Unit 230m3/h– Heat recovery unit
ø160 ø160 88
101
166
164
210
248 151 155
1189
240
R2,50
80
1184
130
545
40
482
545
138 118
151
R80
248 155 554
R80
101
See the characteristics of the DXA Unit system on page 30
· Envelope in EPP, covered by a white creamy metal sheet.
· 2 low energy consumption fans driven by EC (electronic commutation) motors (supply air and
exhaust air).
· 2 F7 anti pollen filters for the fresh air.
· G4 filter for the exhaust to protect fans and the exchanger.
· Continously checking of filter clogging, and warning for filter change.
· High eciency heat exchanger with plastic plates, washable.
· Intelligent electronic control unit of the heat recovery, with integrated or remoted control interface.
· Integrated bypass and free-cooling automatically controlled.
· Built-in siphon or condensate pump to evacuate the condensate.
2.3. DXA ASSEMBLING
When delivered, the DXA Unit is furnished with 4 lipseals spigots.
Before removing the 4 plastic caps, pull out carefully the staples
with a screwdriver to not dammage the EPP material. No need to
seal the spigots once they are pushed in the inlets and outlets of
the DXA, the lipseals make it already airtight.
Assembling of the DXA spigots

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wall
(side view)
wall (top view)
3. INSTALLATION
3.1. LOCATION OF THE INSTALLATION
The unit must be installed into the heated space, in parts of the dwelling relatively
insensitive to noise, not in the unheated space (attic, etc.). Upper and lower
temperature limits for the main unit are 5°C and 50°C
Ductwork should be installed in the heated space. If not, they must be insulated
with 50mm minimum of glass wool (or equivalent). The non compliance with these
conditions leads to the degradation of the heat recovery performance.
Features and uses
DXA Unit CO2sensor Exhaust compensation valve
Max. altitude of the product installation 2000 m 2000 m 2000 m
Temperature range of the installation place 5°C – 50°C 5°C – 40°C 5°C – 40°C
Humidity range of the installation place 5% - 95% Max. 80% at 31°C, linear
decrease up to 50% at 40°C. 5% - 95%
3.2. DXA UNIT
The caps on the DXA Unit must stay during the entire duration of the work, in order to
keep dust and pollution from getting into the boxes.
3.2.1. LOCATION
Before the installation, be sure of the solidity of the wall where you plan to install the DXA
Unit.
· Weight of DXA Unit = 23 kg
The DXA Unit must be positioned exactly vertically (max 1° tolerance).
The non compliance to this requirement may lead to serious problems of condensate
evacuation.
Positionning of the DXA Unit
D = 5 mm
D = 5 mm

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3.2.2. ACCESSIBILITY
The DXA Unit, as well as the distribution box, must be positioned so that it is accessible for
the maintenance and in case of access or removal from the wall / false ceiling.
Recommendation for access hatches
The electrical connections must be easily accessible to be able to disconnect the DXA Unit from
the supply before any operation on the appliance. The circuit-breaker must be easily identified and
accessible.
3.2.3. FIXING OF THE DXA UNIT
The DXA Unit is fixed on a wall thanks to the use of two metal brackets, specific to Aereco. The first
bracket is fixed in the DXA while the second bracket is screwed in the wall. The two brackets are
assembled one within the other.
Quick suspension system proposed by Aereco
D > 15 cm
D > 5 cm
D > 5 cm
Wall
D > 2 cm

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Installation of the fixing system
1
5 6
7 8
x2 x12 x12 x12
DXA Unit DXA Unit
2 3 4
Ø6 mm
Note : For plasterboard walls, molly metal anchors may be used instead of provided plastic anchors.

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3.2.4. DUCT CONNECTIONS TO THE DXA UNIT
The connections to the DXA Unit are all in Ø160 mm. Labels on the unit identify the 4 ducts to be
connected (fresh air, used air, supply air, exhaust air). Outdoor fresh air and used air ducts must
be insulated.
Fresh air
(outdoor to indoor)
Used air
(indoor to outdoor)
Fresh air supply
(outdoor to indoor)
Exhaust air
(indoor to outdoor)
DXA top view
Each supply unit can be connected to a distribution box by a Ø100mm for rigid duct or
by a Ø75mm duct for semi-rigid duct. Each semi-rigid duct cannot aord an airflow
bigger than 30m3/h.
1Ø100 or Ø75 mm
2Ø100 mm or Ø125 mm
3Ø160 mm
4Ø160 + 50mm insulation
Supply: rigid or semi-rigid duct
+ flexible connection to the unit (1m max)
(avoid noise in the room)
Exhaust air: rigid (avoid pressure drop)
or semi-rigid duct
Air intake and air outlet: insulated rigid
duct (avoid pressure drop and condensation)
Duct diameters and recommendation concerning the type of ducts
1
1
1
1
2
2
2
3
4
4
SDC100 SDC
100
SDC100
SDC100
BXC BXC
BXC
compensation
to exhaust air outlet
to fresh air inlet

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· If rigid ducts are used, the connection between the DXA Unit and the duct must be made using
a flexible sleeve (Ø160 mm), in order to avoid transmitting vibrations from the fan to the duct.
-Make sure that the flexible sleeve is not twisted or wrinkled and that it is correctly aligned
but not completely taut between the unit and the ductwork. To achieve this, it is essential
to have a constant section on either side of the sleeve.
-To perform its function of decoupling between the components, the sleeve can be attached
by means of flat metallic clamping rings. It will then be necessary to make sure of the
airtightness of the assembly.
· If flexible ducts are used, the connection can be carried on directly to the unit, making
sure that the connection is secure and tight with flat clamping rings and adhesive.
In order to fully guarantee the acoustic quality of the installation, it is necessary to
attenuate airborne noise from the main unit by:
·20 dB at 500 Hz at supply
·15 dB at 500 Hz at exhaust
This can be done using a silencer or an equivalent length of acoustic duct between the
DXA Unit and the distribution box.
3.2.5. EVACUATION OF CONDENSATES
To evacuate condensates, it is recommended to use a lift pump. It is also possible to use a
siphon to evacuate them by gravity, but a minimum slope of about 3° is recommended for
the good evacuation of condensates.
To ensure watertight connections between the condensate evacuation pipe and the lift
pump or the siphon, the DXA Unit is delivered with these components already built-in.
The DXA1240 is equipped with a lift pump, while the DXA1247 is equipped with a siphon.
Only the evacuation pipe to the wastewater has to be realized. This evacuation must be
insulated if installed outside the heated volume (risk of freezing).
Using the lift pump (DXA1240)
· A vertical height of 8 meters must not exceed between the lift pump and the evacuation duct.
Note: The lift pump proposed by Aereco was tested and validated specially for DX System. Using
another lift pump can lead to serious problems of functioning and degrade the security of the
system. All the connections must be watertight.
Using the siphon (DXA1247)
The condensate ducts must not be higher than the DXA Unit evacuation outlet
Before fixing the DXA Unit on the wall, the siphon has to be filled with 0.5 L of water. A funnel can
be used to realise the operation.
Connection with flexible sleeve
Evacuation of condensates with the built-in siphon
Evacuation of condensates with a lift pump
(specific to Aereco)
max 8 m

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3.3. EXHAUST COMPENSATION VALVE (MCP 125)
The valve is located in the final duct that serves the exhaust compensation unit (in the kitchen). It is
therefore in Ø125 mm. This product is specific to DX system.
The valve can be positioned in any direction, the maximum length being 232mm. However,
attention must be paid to the direction of the airflow in the valve: an arrow marked on the
valve indicates the correct position.
The pressure within the exhaust ductwork is measure in the compensation valve, just after the
damper. This allows to measure the pressure at the same level than the extract units. This measure
takes into account the pressure drops through filters and exhaust ductwork. It ensures at the extract
units the require pressure needed for a perfect running with a very high accuracy.
232
205
Ø125 mm
Exhaust compensation valve
Positioning of the exhaust compensation valve
with access hatch
D > 38cm D > 38cm
Check the good quality of the pressure pipe, postionned on the exhaust compensation
valve, before carrying the installation. The pressure pipe must not be crushed.
The valve must be placed in the duct, at a minimum distance equivalent to 3 diameters (38cm for a
125 mm duct) from any fittings, and from the compensation unit.
In addition, there must be an inspection hatch to access the valve for maintenance.

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3.4. DEFROSTING
The defrosting is located in the duct that serves the fresh air inlet, upstream from the DXA Unit. It is
therefore in Ø160 mm and insulated. A length of 1 m must be respected between the DXA Unit
and the defrosting. The fresh air supply air duct must be manufactured from non-flammable
materials (A1 Class according to EN 13501-1).
The air must travel in the direction shown by the arrows marked on the defrosting device.
325
250
Ø160 mm
View of the defrosting
Positioning of the defrosting compared to the
DXA Unit
L > 1m
The defrosting must be located at a distance of at least twice the connection diameter from a duct
bend or external grille, and at 1m from the DXA Unit. We recommend tilting the duct slightly towards
the exterior in order to keep rain water from getting into the defrosting.
The installation must allow access to the defrosting for a manual reset, or for maintenance
(access hatch).
Manual reset of the defrosting:
1. Unscrew the black cap 2. Push the red button and screw back the
black cap on
The defrosting must not be installed with the
electrical device at the bottom.
Note:
· The DXA Unit has been specially designed to work with the defrosting provided by Aereco (defrost
strategy specific to DX System, and adapted diameter). Besides, it has been CEM certified with the
DXA Unit.
· Using another defrosting can lead to serious problems of functioning and degrade the security of
the system.
Anti-frost without pre-heating resistance
· When using the DXA Unit without the additional resistance pre-heating, the anti-frost strategy is
based on the supply airflow regulation. The supply air fan is switched o and the extract air fan
remains active, in order to warm up the heat exchanger.
Be careful, very often, this type of strategy does not comply with an open fireplace. Make
sure that you comply with the standard in force in the country of installation.
When the optional defrosting device is used, this anti-frost strategy is not active anymore.

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3.5. SENSORS
The DXA Premium version is compatible with two types of sensors for the management of supply
airflow: presence detection or CO2.
In Premium version, at least one sensor has to be installed in a main room. If, at least two
and up to 5 sensors are installed, an average value is calculated for the supply airflow.
- Presence sensors and CO2sensors can be mixed together.
- A maximum of 5 sensors can be connected to the system.
- The connection to the system is made through RJ12 wires. Only the specific ones supplied by
Aereco can be used.
3.5.1. PRESENCE SENSORS (DX S-PRE)
The DX S-PRE presence detector uses infrared radiation to measure movements made in a room.
The detector includes a LED indicator that displays the detections in order to inform the users.
When luminosity in the room is very low, the LED is automatically switched o.
The S-PRE sensor must be installed on the ceiling at a place it can easily detect the presence. The
operating scenarios are the following ones :
If detection during the night, over ventilation for 45 minutes after the last detection.
If detection during the day, over ventilation for 20 minutes after the last detection.
If no detection, supply airflow is reduced to a minimum to save energy.
3.5.2. C02SENSORS (DX S-C02)
C02 Sensors must be installed on the wall, at a height of at least 1.5 from the floor, or at the
ceiling, and must respect the following recommendations:
· keep the sensor away from any direct solar radiation,
· keep the sensor away from draughts (door, window, supply, etc.),
· avoid placing the sensor in dead zones (behind curtains, furniture, etc.),
· keep the sensor away from heat sources and from occupants,
· if the sensor is located at the ceiling, keep it away from any supply unit.
5 indexation positions are allowed for every sensor (presence or CO2): position 1 to position 5
included.
Important: Before to start the heat recovery unit, every sensor must have a specific
identification number (1 to 5) so that the system can identify them. As the sensor is
delivered in position 0, its position has to be changed. This identification number has to be
dierent from a sensor to another one.
Example:
· Presence sensor bedroom A = 1
· Presence sensor bedroom B = 2
· Presence sensor bedroom C = 3
· CO2sensor in living room = 4
Note: The sensor must be manipulated with extreme care.
Presence detector
CO2sensor
Setting of the sensors DX S-PRE and DX S-CO2
Choice of sensor number (on the electronic card)
1 3
4
5
2
TF5414_B
B
ACD
E
F
0

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3.6. DXA USER’S INTERFACE
The interface can be either installed on a wall or directly on the DXA Unit itself.
If installed on a wall, the interface must be installed in an unobstructed place and located at eye
level of the user. This height can be dierent, according to the occupant of the dwelling, and if
necessary take into account access to disabled person. In all cases, it is essential to comply with the
standard in force in the country of installation.
If the interface is fixed on a wall, the EPP cap, specific to the DXA Unit and delivred with the
interface, must be placed in the space reserved for it.
Boost ventilation Free cooling Settings
System status
System status Energy Energy Maintenance Maintenance
Boostventilation Free cooling Settings
Systemstatus Energy Maintenance
Boostventilation Free cooling Settings
Systemstatus Energy Maintenance
RJ12 cable
DXA Unit with its interface fixed on a wall Opening of the user's interface dedicated for a wall fixation.
DXA Unit and its built-in interface
Boostventilation Free cooling Settings
System status
System status Energy
Energy Maintenance
Maintenance
BoostventilationFree cooling Settings
Systemstatus Energy Maintenance
RJ12 cable
1
1
RJ12 cable
3
Boostventilation Free cooling Settings
Systemstatus
Systemstatus
Energy
Energy
Maintenance
Maintenance
3
2
Boostventilation Free cooling Settings
Systemstatus
Systemstatus
Energy
Energy
Maintenance
Maintenance
2
4
4
RJ12 cable connected to one of the DXA RJ12 available
socket
RJ12 cable (provided) connected to the interface RJ12
socket

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3.7. SPECIAL CARE FOR THE DUCTWORK
Any duct that is outdoors or in an unheated volume must be insulated with 50 mm of
glass wool or equivalent. In countries where the temperature can go under -10°C, the
recommendation of insulation is at least 100 mm of glass wool.
Mounting of ducts:
· The ductwork must be airtight (see recommendations for an airtight ductwork in page 24).
· Take care not to use a material that is too fragile or too flexible.
· The inner surfaces of all ducts must be as smooth as possible.
· Avoid having too many bends (make them gradual, with a large curvature).
· It is recommended to use flexible (about 50cm) to connect the compensation valve to the supply
units, to limitate risks of noise in the main rooms, in that case:
-Avoid slopes (flexible ducts must be securely attached).
-Tauten the straight parts so that the duct is smooth and straight (when using flexible or
semi flexible ducts).
-If the flexible duct is longer than necessary, it must be cut rather than pushing the surplus
into the false ceiling.
-Do not crush the duct or squeeze it down to force it through a narrow passage.
· The interior of the ductwork must be protected during the entire duration of the work (from dust,
pollutants, etc.), using caps, plastic bags, or tape.
The installation of supply and exhaust units, and fresh air inlet and exhaust air outlet
must be carried out in order to obtain a system that performs well in terms of both
aeraulics and thermal and acoustic comfort (see recommendations for the installation
of the units in page 24).
3.8. FIRE PROTECTION
The installation must comply with the fire protection standards in force in the country concerned.

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4. ELECTRICAL CONNECTIONS
Disconnect the electrical supply before any operations and ensure that the DXAUnit
cannot be started accidentally.
Only cables provided by Aereco must be used to carry on the DXA Unit installation. If using
dierent cables, Aereco won’t be able to guarantee the good functioning of the appliance.
The installation must be carried out by a professional in compliance with applicable
regulations in force in the country of installation. Each product or component used in the
installation must also comply with standards in force in the country.
B
C
B
A
E
F
230 VAC
230 VAC
D
G
230 VAC
AInterface
BPresence sensors
CCO2sensor
DDXA Unit
EDefrosting
FLift pump
GCompensation valve at exhaust
RJ 45
RJ 12 (specific to Aereco)
Defrosting control: 0.5 mm²
Input pump alarm: 0.5 mm²
Supply (230 V): 1.5 mm².
Note: RJ12 and RJ45 cables provide both supply and connections.
RJ12 maximal length: RJ45 maximal length:
DXA Unit to the interface 10 m max. DXA Unit to the exhaust compensation valve
10 m max.
DXA Unit to sensors
30 m max.
Do not connect RJ45 cables to an Ethernet or a phone network. Only external devices
provided by Aereco must be connected to RJ plugging.
The DXA Unit is not designed to be connected to smart home system; settings and data
display are realised only through the Aereco touch screen interface.

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If using crimping tool to fit the RJ12 plug to the cable, be careful of the position of the wire at both
cable end: the wires must have the same order at both end as shown on the picture below.
Global electrical diagram
4.1. ELECTRICAL CONNECTION ON THE DXA UNIT
1Sensor / Interface (RJ 12)
2DX Hub (RJ 45 - not used in Premium
version)
3Pump Alarm 9V (optional)
4Alarm 9V (optional)
5Defrosting control 9V (optional)
6Compensation exhaust valve (RJ 45)
79VDC OUTPUT
8230VAC, 50/60Hz, 180W max
9ON / OFF
DXA Unit
1
2
3
4
5
+
-
+
-
7
6
9
To circuit
breaker 2A
N
GND
L
8
230VAC 1.5mm²
230VAC 1.5mm²
230VAC 1.5mm²
The main power supply is on the DXA Unit.
Sensors, user’s interface and the exhaust compensation valve are accessed from
communication bus.
Optional exhaust units can be connected to 9 VDC output supply [7] via a 2 wire cable
having a cross sectional area of at least 0.75 mm² and a maximal length of 25 meters.
RJ right plugging
Only RJ12 which the following specifications can used:
24 AWG; CAT5E; straight-thru

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TF6400_A Aereco S.A.
4.2. ELECTRICAL CONNECTION OF THE DEFROSTING
N - P
1 200 W
L1 - P
1 200 W
A1 +
A2 -
Defrosting unit
230 VAC 3 x 1.5 mm²
To circuit breaker 10 A
0.5 mm²
0.5 mm²
DXA Unit
+
-
Details of DXA Unit and defrosting connection
The defrosting has an individual supply in 230 VAC, 50/60 Hz, single-phase via a flexible cable
having a cross-sectional area of at least 1.5 mm². The control is connected via a 2 wire cable
having a cross sectional area of at least 0.5 mm² and a maximal length of 10 meters.
The electrical connection must be made by a professional and comply with the standards in force
in the country of installation.
Plan a contact separation device having an opening distance of at least 3 mm on each pole.
Note: there is no alarm in the defrosting provided by Aereco.
Details of condensate pump electrical connections
4.3. ELECTRICAL CONNECTION OF THE CONDENSATE PUMP FOR DXA 1247
THE DXA1247 is provided with a built in siphon. It is still possible to connect a condensate pump
after the siphon. The diagram below displays the electrical connections.
Dry contact alarm connections.
The alarm is connected via a 2 wire cable having a cross sectional area of at least 0.5 mm² and a
maximal length of 10 meters.
DXA Unit
+
-
230VAC 3x1.5mm²
To circuit breaker 2A
L (Brown), N(Blue) 230V 0.5mm²
Grey, black
L
N
GND
230VAC blue 1.5mm²
230VAC GND 1.5mm²
230VAC Brown 1.5mm²

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TF6400_A Aereco S.A.
5. STARTING AND SETTINGS OF THE DX SYSTEM
Please refer to DXA Premium version Interface Use and settings instructions notice.
6. MAINTENANCE
For every operation of maintenance, even replacement of filters, disconnect the electrical
supply before any operation and ensure that the unit cannot be started accidentally.
Maintenance of ventilation installation helps to avoid:
· microbial contamination of the installations, with consequences on comfort and health (the impact
of such contamination is aggravated in an air supply);
· loss of aeraulic performance through too high pressure drops, increase of fan consumption;
· noise (from a too high air speed, and from high speed rotation of fan due to clogged filters).
6.1. REGULAR MAINTENANCE OF THE INSTALLATION
Frequency Maintenance
when the alarm indicates it Filters: switch o the heat recovery unit and replace the filters, then switch on the heat recovery unit. It is essential to
replace all filters at the same time.
once a year
Fresh air inlet and exhaust air outlet: check the unobstructed passage of air (no dead leaves, no snow).
Supply and exhaust units: cleaning as recommended by the manufacturer (this part can be done by the occupant).
Evacuation of condensates: check that the system is not obstructed by impurities.
WARNING: Plan replacement of the condensates evacuation pump according to the life span announced by the supplier. If
using a DXA Unit with a built-in siphon, check that siphons is filled with water. If not, it is necessary to fill the siphon with
water.
Ductwork: check and cleaning if the ductwork is obstructed.
once every 5 years
Exchanger: check the exchanger and clean it with a vacuum cleaner, only if necessary.
Fans:
· check the blades
· check and possibly replace the antivibration sleeve and the collars
· check and cleaning if the grilles protecting the fans are obstructed
6.2. FUSE
External Fuse :
· 250V T1.6A / Ø5x20 mm
Internals fuses :
· Fuse F1 : Fuse T1A / Ø5x20 mm
· Fuse F2 : Fuse T630 mA / Ø5x20 m
Details of internal electronic card