Soler & Palau CAD-COMPACT Series User manual

CAD COMPACT ECOWATT
EN

3
INDEX
1. INTRODUCTION ......................................................................................................................................4
2. SAFETY REGULATIONS AND “CE” MARKING ........................................................................................4
3. GENERAL INSTRUCTIONS .....................................................................................................................4
4. UNIT LABELLING....................................................................................................................................4
5. HANDLING..............................................................................................................................................5
6. INSTALLATION .......................................................................................................................................5
6.1. Introduction......................................................................................................................................5
6.1.1. Outdoor installation................................................................................................................6
6.2. Dimensions and free space for maintenance..................................................................................8
6.3. Mounting process of an additional supply filter..............................................................................9
6.4. Range specifications......................................................................................................................10
6.5. Connections .................................................................................................................................10
6.5.1. Connection with air duct ......................................................................................................10
6.5.2. Condensate drainage ...........................................................................................................10
6.6. Electrical connection .....................................................................................................................11
6.6.1. Wiring diagram.....................................................................................................................11
6.6.2. Fan operation without speed regulation. Operation at maximum speed............................12
6.6.3. Connecting electrical accessories.......................................................................................13
6.6.3.1. VAV control (Variable airflow), manual adjustment................................................13
6.6.3.1.1. Manual adjustment by REB-ECOWATT (accessory)................................13
6.6.3.2. VAV Control (variable airflow), with CO2sensor or similar ....................................14
6.6.3.3. CAV control (constant airflow) ................................................................................14
6.6.3.4.COP Control (constant pressure).............................................................................15
6.6.3.5. Pressure switch connection....................................................................................16
6.7. Reverse outdoor air / indoor air side ............................................................................................18
7. INSPECTION, MAINTENANCE AND CLEANING...................................................................................19
7.1. Filters replacement .......................................................................................................................19
7.2. Additional filter installation...........................................................................................................19
7.3. Heat exchanger..............................................................................................................................20
7.4. Fans................................................................................................................................................20
7.5. Condensation drainpipe.................................................................................................................20
8. OPERATION ANOMALIES......................................................................................................................21
8.1. General anomalies.........................................................................................................................21

4
1. INTRODUCTION
Thank you for purchasing this appliance. It has been manufactured in full compliance with applicable
safety regulations and EU standards.
Please read this instruction book carefully, as it contains important information for your safety during
the installation, use and maintenance of this product.
Keep it at hand for future reference.
Please check that the appliance is in perfect condition when you unpack it, as all factory defects are
covered by the S&P guarantee.
2. SAFETY REGULATIONS AND “CE” MARKING
S&P technicians are firmly committed to research and development of ever more efficient products and
in compliance with current safety regulations.
The instructions and recommendations given below reflect current regulations, principally regarding
safety, and therefore are based on compliance with general regulations. Therefore, we recommend all
people exposed to hazards to strictly follow the safety regulations in force in your country. S&P will not
be held liable for any possible harm or damage caused by non-compliance with the safety regulations,
as well as caused by modifying the product.
The CE mark and the corresponding declaration of conformity are proof of the product’s conformity with
current EU regulations.
3. GENERAL INSTRUCTIONS
A hazard analysis of the product has been carried out as provided in the Machine Directive. This manual
contains information for all personnel exposed to these hazards, with the aim of preventing possible
harm or damage due to faulty handling or maintenance.
All maintenance operations (ordinary and extraordinary) must be carried out with the machine switched
off and the electrical power supply disconnected.
To avoid a possible accidental start up, place a warning notice on the electrical control panel with the
following text:
“Attention: control disconnected for maintenance operations”
Before connecting the power supply cable to the terminal strip, make sure the mains voltage corres-
ponds to the voltage indicated on the specifications plate of the unit.
Regularly check the product labels. If, due to the passing of time, they are no longer legible, they must
be replaced.
4. UNIT LABELLING
The machine may come with several pictograms that must not be removed. These signs are divided into:
• Prohibition signs: Do not repair or adjust when in operation.
• Danger signs: Warning of the presence of live elements inside the container bearing the sign.
• Identification signs: CE card, indicating product information and manufacturer’s address. The CE
mark indicates the product’s conformity with EEC standards.
Danger signs Prohibition signs

5
5. HANDLING
The CAD COMPACT ECOWATT units are delivered fixed with screws to the pallets.
The handling machines will be adapted to the load and the lifting conditions. In all cases, the lifting will
be done at the device’s base. The centre of gravity is located at the centre of the unit. The device must be
carefully manipulated only in the horizontal position.
6. INSTALLATION
6.1. INTRODUCTION
All models are designed to be installed hanging from the ceiling or located behind a false ceiling.
When installing the unit, is necessary to distribute the unit weigh between the 4 supports existing in the
units.
Using studded rods (Ø 8 mm), it can be secured to the ceiling and levelled:
Check the distances between supports in the diagrams of the section: “Dimensions and free dimensions
for maintenance”.
The installer must make sure that the ceiling structure and the securing elements can bear the weight
of the device, taking into account that it is a dynamic load.

6
To prevent the transmission of vibrations from the unit to the rest of the installation, it is necessary that
the installer use specific isolation elements, as well as flexible couplings between the water connec-
tions and the pipelines.
Model Total weight of unit
(kg)
Anti vibration kit support
(Composed of 4 pcs.)
CAD COMPACT 500 70 KIT AM CAD-COMPACT
CAD COMPACT 900 86 KIT AM CAD-COMPACT
CAD COMPACT 1300 137 KIT AM CAD-COMPACT
CAD COMPACT 1800 145 KIT AM CAD-COMPACT
CAD COMPACT 3200 235 KIT AM CAD-COMPACT
CAD COMPACT 4500 336 KIT AM CAD-COMPACT
6.1.1. Outdoor installation
The CAD-COMPACT ECOWATT range is advisable to be mounted indoors. Outdoor mounting is li-
mited to areas with less extreme climates. When it is installed outdoors,it is preferable to place
the unit under a cover which offers enough protection to prevent rain falling directly to the unit, or
install the corresponding rain canopy (accessory). If installed on the ground, sufficient space must
be guaranteed under the unit so that it is possible to install the corresponding siphons in the
condensate outlets of the unit.
There is a Kit composed of 6 feet, which facilitates the assembly on floor of these versions:
KIT FEET CAD-COMPACT.
Both in the case that the KIT FEET CAD-COMPACT is used, and if the unit is based on vibrators or
supports made on site, it is essential that the heat exchanger’s support is guaranteed on 6 exis-
ting support points (4 pcs. in the corners of the unit and 2 in the midpoint of each side).
Detail of a CAD-COMPACT with the corresponding canopy and Kit feet

7
List of necessary accessories needed for outdoor mounting:
Model Kit feet Roof
CAD COMPACT 500 KIT PIES CAD COMPACT TPP-CAD COMPACT 500
CAD COMPACT 900 KIT PIES CAD COMPACT TPP-CAD COMPACT 900
CAD COMPACT 1300 KIT PIES CAD COMPACT TPP-CAD COMPACT 1300
CAD COMPACT 1800 KIT PIES CAD COMPACT TPP-CAD COMPACT 1800
CAD COMPACT 3200 KIT PIES CAD COMPACT TPP-CAD COMPACT 3200
CAD COMPACT 4500 KIT PIES CAD COMPACT TPP-CAD COMPACT 4500
In addition to the roof and Kit feet, it is necessary to equip the duct network with rain hoods or air
intakes equipped with anti-bird mesh to prevent the entry of animals or objects into the interior
of the heat recovery unit.
Avoid condensations in electrical cabinet
In units located in outdoor installation where the heat recovery units stop during the night or
during long intervals of time, it is necessary to:
a) Install isolation dampers in air inlet and air outlet.
b) Add anticondensation devices in the electrical cabinet as: cabinet heating elements that pre-
vent condensation formation on cabinet surfaces and electronic components.

8
6.2. DIMENSIONS AND FREE SPACE FOR MAINTENANCE
a) CAD-COMPACT 600 to 1800 models
A
ØD
F
G
C
B
E
H
I
J
K K
I
J
H
BY DEFAULT (FACTORY SUPPLY)
TOP VIEW
CONFIGURATION RESULT OF SIMPLE
MODIFICATION ON SITE
FAN ACCESS
FILTER
ACCESS
E
OUTDOOR AIR INTAKE
SUPPLY NEW AIR
EXHAUST INDOOR AIR
EXTRACT INDOOR AIR
CONDENSATE OUTLET 1/2"
ELECTRICAL CABINET
E
E
E
FILTER
ACCESS
FILTER
ACCESS
FILTER
ACCESS
FAN ACCESS FAN ACCESS FAN ACCESS
Model A B C D E F G H I J K
CAD-COMPACT 500 1120 698 289 200 862 147 188 1163 546 12 256
CAD-COMPACT 900 1345 843 376 315 1007 190 225 1388 691 12 328
CAD-COMPACT 1300 1495 1218 376 315 1382 190 318 1538 1066 12 403
CAD-COMPACT 1800 1580 1083 453 355 1247 228 285 1623 931 12 393

9
b) CAD-COMPACT 3200 and CAD-COMPACT 4500 models
A
K
C
K
B
E
F
GM
L
E
TOP VIEW
BY DEFAULT (FACTORY SUPPLY)
CONFIGURATION RESULT OF SIMPLE
MODIFICATION ON SITE
J
I
E
H
E
I
H
J
FAN ACCESS
FILTER
ACCESS
OUTDOOR AIR INTAKE
SUPPLY NEW AIR
EXHAUST INDOOR AIR
EXTRACT INDOOR AIR
CONDENSATE OUTLET 1/2"
ELECTRICAL CABINET
E
FILTER
ACCESS
FILTER
ACCESS
FILTER
ACCESS
FAN ACCESS FAN ACCESS FAN ACCESS
Model ABCDEFGH I JKLM
CAD-COMPACT 3200 2038 1325 541 - 1489 113 43 2081 1176 12 552 470 450
CAD-COMPACT 4500 2207 1993 598 - 2156 165 79 2250 1844 12 594 700 440
6.3. MOUNTING PROCESS OF AN ADDITIONAL SUPPLY FILTER
The heat recovery unit is supplied with the filters already installed. F7 (ePM1 70%) in exhaust air and M5
(ePM10 50%) in supply air. In addition, it is possible to mount a second filter in the unit (accessory) (for
more information see section “Replacing filters”).

10
6.4. RANGE SPECIFICATIONS
Model Diameter
connections
air
(mm)
Nominal
airflow
150Pa**
(m
3
/h)
Efficiency
heat recovery
unit*
(%)
Electrical
power supply
Maximum
absorbed
power**
(kW)
Maximum
current**
(A)
Weight
(kg)
CAD-COMPACT 500 200 440 82,2 1/230V, 50-60Hz 0,31 2,1 70
CAD-COMPACT 900 315 790 82,0 1/230V, 50-60Hz 0,45 3,0 91
CAD-COMPACT 1300 315 1.120 82,3 1/230V, 50-60Hz 0,93 3,9 120
CAD-COMPACT 1800 355 1.670 82,7 1/230V, 50-60Hz 1,02 4,3 150
CAD-COMPACT 3200 470x450 3.000 83,7 1/230V, 50-60Hz 2,00 8,3 235
CAD-COMPACT 4500 700x440 4.165 84,6 3/400V, 50-60Hz 2,60 10,4 336
* Wet efficiency referred to nominal airflow, external conditions (-5ºC 80% RH) and interior (20ºC / 50% RH).
** Sum of both fans.
6.5. CONNECTIONS
6.5.1. Connection with air duct
The fans are always blowing out with regard to the machine. Before making the connection of air
lines, verify existing identification labels in each mouth of the heat recovery units.
Exhaust air
Aire de expulsión
Espulsione all esterno
Air rejeté
Fortluft
Outdoor air
Aire exterior
Aria di rinnovo
Air neur
Aussenluft
Supply air
Aire de impulsión
Inmissione
Air Soufflé
Zuluft
Extract air
Aire de extracción
Estrazione dal locale
Air repris
Abluft
6.5.2. Condensate drainage
The units are supplied with 2 drains (one for each circuit). For added security it has to connect
two drains to the drain pipe of the building. Drain tips are 1/2 “GM threaded.
Drainage system
• To ensure the removal of draining condensate from the tray a siphon must be installed with
pressure head difference in mmWG greater than the pressure provided by the fan.
• The horizontal sections should have a minimum slope of 2%.
min. 80mm
=
=
Conexionado a la
línea de condensados
Condensation
connection
The siphon should always be full of water. Check its level periodically, refilling it if necessary. An
empty siphon can cause the condensate tray to overflow and water leak through the equipment
enclosure.

11
6.6. ELECTRICAL CONNECTION
The CAD-COMPACT ECOWATT range are supplied without a complete operating control integrated in the
unit. The electrical components included in the unit are supplied wired in an electrical cabinet located
in one side of the unit. To access the electrical terminal block and conveniently make the electrical con-
nection of the accessories it is advisable to remove the connection board, follow the following sequence:
1. Loosen the 5 screws that are distributed by the cover of the electrical cabinet (Fig. 1)
2. Open the cover and pull the metal plate on which the electrical terminals are located until it is outside
the cabinet (Fig. 2).
3. The electrical cabinet has a PG connector for the electrical power cable. Further of this, in a bag that
is supplied inside the unit, there are 3 more connectors that can be used to route the control wiring
to the control accessories or the control panel of the building. Pass the necessary wiring through the
connectors.
4. Make the electrical connection to the control board and put it back inside the electrical cabinet, ma-
king it slide through the existing guides (Fig. 3).
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6.6.1. Wiring diagram
CAD-COMPACT models 500 to 3200 have plug-fans with EC motors 230V supply voltage, while the
CAD-COMPACT 4500 model have fans with a three-phase motor.
The electrical wiring consists of two phases: the power supply of the fans and the control wire.
Fans power wiring
The two fans are wired to the switch located on the lid of the electrical cabinet. To power the fans,
wire the power line to the terminals of the switch.
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In case that electrical accessories are not used, to regulate the fans speed, it is possible to force
their maximum speed by bridging the terminals + 10V and 0-10V on each fans.
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13
6.6.3. Connecting electrical accessories
With the existing accessories is possible to perform the fans control as well as the automatic
control in VAV (variable airflow) and COP (constant pressure) modes.
Recommended accessories depending on the unit size and the control mode
Model Accessories for the
Variable Air Volume System for CO2
Accessories for
constant pressure
operation
Accessories
for speed manual
control
Inverter Sensor Inverter Probe Electronic regulator
CAD COMPACT 500 CONTROL CAD-REG AIRSENS CO2 / SC02-AD 0-10V / SC02-G 0-10/V CONTROL AERO-REG** TDP-D* REB-ECOWATT**
CAD COMPACT 900 CONTROL CAD-REG AIRSENS CO2 / SC02-AD 0-10V / SC02-G 0-10/V CONTROL AERO-REG** TDP-D* REB-ECOWATT**
CAD COMPACT 1300 CONTROL CAD-REG AIRSENS CO2 / SC02-AD 0-10V / SC02-G 0-10/V CONTROL AERO-REG** TDP-D* REB-ECOWATT**
CAD COMPACT 1800 CONTROL CAD-REG AIRSENS CO2 / SC02-AD 0-10V / SC02-G 0-10/V CONTROL AERO-REG** TDP-D* REB-ECOWATT**
CAD COMPACT 3200 CONTROL CAD-REG AIRSENS CO2 / SC02-AD 0-10V / SC02-G 0-10/V CONTROL AERO-REG** TDP-D* REB-ECOWATT**
CAD COMPACT 4500 CONTROL CAD-REG AIRSENS CO2 / SC02-AD 0-10V / SC02-G 0-10/V CONTROL AERO-REG** TDP-D* REB-ECOWATT**
* For independent control of the working point of each circuit, the supply and extraction fans must be independently controlled by
regulator and pressure probe.
** For independent control of the working point of each circuit, the supply and extraction fans must be controlled with its corresponding
electronic regulator.
6.6.3.1. VAV control (Variable airflow), manual adjustment
It is possible to control in VAV mode manually with an external potentiometer. Manual control by
external potentiometer REB-ECOWATT (accessory).
6.6.3.1.1. Manual adjustment by REB-ECOWATT (accessory)
Simultaneous control of the supply and extract fans
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REB-ECOWATT
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14
Independent control of supply and extract fans
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6.6.3.2. VAV Control (variable airflow), with CO2sensor or similar
CAD-COMPACT units are equipped with EC motors. The motors have specific terminals for sen-
ding a regulation signal to control fan speed (0-10V). The 0V signal corresponds to the fan stop,
while the signal of 10V corresponds to fan maximum speed.
To perform the speed regulation in VAV with speed control with external sensor of CO2or similar, it
is necessary to use the accessory CONTROL CAD-REG and the external sensor (see point 7.5.2.4.).
In the CONTROL CAD-REG instruction booklet it is contained the necessary information to carry
on the electrical connection of the different components.
6.6.3.3. CAV control (constant airflow)
The inverter is used to guarantee an specific constant air volume in the duct system, regardless
of the filters clogging state.
CAD-COMPACT units are equipped with EC motors. The motors have specific terminals for sen-
ding a regulation signal to control fan speed (0-10V).
The 0V signal corresponds to the fan stop, while the 10V signal corresponds to the maximum fan
speed.
To perform speed regulation in pressure or constant airflow mode, it is necessary to use the CON-
TROL AERO-REG accessory and the corresponding external TDP-D sensor.
1º Connect the pressure transmitter TDP-D (accessory) to the specific pressure taps there are
in the heat recovery unit. Ensure that pressure taps “+“ and “-“ . of the pressure transmitter
concides with those of the heat recovery unit.
+-
-
+

15
2º Perform the electrical connection and regulator configuration, following the instructions of
the CONTROL AERO-REG accessory.
3º Reconfigure the pressure transmitter. So that the regulation is correct and the transmitters
correctly visualize the airflow, it is necessary that it is configured to work in airflow mode with
a range of 9,999 m3/h.
Adjustment to work in airflow mode
The selection between pressure and airflow is made by the DIP3(SW1) micro switch existing insi-
de the micro switch. Fix the micro switch in ON position.
Indicate the airflow range
Once configured the airflow measurement, press the “OK” button to set the first digit of factor k.
The value flashes and is adjusted using the buttons “” and “”. when set, press the “OK” button
to memorise the factor k. The actual measured value is displayed. If a airflow range is selected it
is not necessary to enter a range of pressures.
Model K factor
CAD-COMPACT 500 28
CAD-COMPACT 900 59
CAD-COMPACT 1300 55
CAD-COMPACT 1800 58
CAD-COMPACT 3200 93
CAD-COMPACT 4500 142
6.6.3.4.COP Control (constant pressure)
Constant Pressure (COP)
This type of regulation is associated to multi-zone ventilation systems in which ventilation multi-
room is carried out by a single heat recovery unit. Flow regulation per zone is done using mo-
torized dampers, so speed regulation of the fans aims to maintain a constant pressure in the
ductwork. The value of this pressure must be determined by experimenting during the system
start-up process.
CAD-COMPACT units are equipped with EC motors. The motors have specific terminals for sen-
ding a regulation signal to control fan speed (0-10V).
The 0V signal corresponds to the fan stop, while the signal of 10V corresponds to fan maximum
speed.

16
To perform the speed regulation in COP mode, it is necessary to use the accessory CONTROL AERO-
REG and the external pressure sensor TDP-D. In the CONTROL AERO-REG instruction booklet it is
contained the necessary information to carry on the electrical connection of the different compo-
nents.
1º Connect the pressure transmitter TDP-D (accessory) to the duct system where the heat re-
covery unit is ducted. Ensure that pressure taps “+“ and “-“ coincide with those of the heat
recovery unit:
Position of the pressure taps of the TDP-D transmitter in COP systems with control of the
extraction pressure

7'3'
$FFHVVRU\
&21752/
$(525(*
$FFHVVRU\
(;75$&7,21
'8&72)
%8,/',1*
'8&72)1(:
$,5,1387
Position of the pressure taps of the TDP-D transmitter in COP systems with control of the
supply pressure.
(;75$&7,21
'8&72)
%8,/',1*
'8&72)1(:
$,5,1387
&21752/
$(525(*
$FFHVVRU\
7'3'
$FFHVVRU\

6.6.3.5. Pressure switch connection
All CAD-COMPACT range of heat recovery units have differencial pressure switches to perform
the control of polluted filters. The pressure switches are located inside the equipment and wired
to the electrical cabinet. If you want to obtain specific information on the status of the filters
through (light or sound indication), it is possible to carry out an electrical operation by passing the
power line through the filter contact.

17
Filter (ǻP)
Extract
Supply
Filter (ǻP)
32
1
32
1
WHITE / BLANCO
GREEN / VERDE
GREEN / VERDE
WHITE / BLANCO
Control pressure
ƐǁŝƚĐŚĮůƚĞƌydZd/KE
&ŝůƚĞƌK< ϭͲϮŽŶƟŶƵŝƚLJ
ŝƌƚLJĮůƚĞƌ ϭͲϯŽŶƟŶƵŝƚLJ
Control pressure
ƐǁŝƚĐŚĮůƚĞƌ^hWW>z
WŽƚĞŶƟĂůͲĨƌĞĞĐŽŶƚĂĐƚ
ĂǀĂŝůĂďůĞƚŽƉĞƌĨŽƌŵ
ĞdžƚĞƌŶĂůǁŝƌŝŶŐ
dZD/E>^/E/d/KE
&/>dZ^ddh^
ELECTRIC CABINET
/E^/d,hE/d
In any case, it is recommended to use a CONTROL CAD-REG or CONTROL AERO-REG control
accessory that, in addition to the filter supervision functions, integrates other functionalities such
as speed regulation, fan fault control, modbus communication, etc.
Detail of the connection to the CONTROL CAD-REG to enable the control of clogged filters:
1
2
3
18
GND
14 15 16 17
PD
19 20
WHITE / BLANCO
GREEN / VERDE
Filter (ǻ3)
Extract
Supply
Filter (ǻ3)
GREEN / VERDE
WHITE / BLANCO
32
1
CONTROL CAD-REG
(AccesƐorLJ)
CAD-COMPACT -ECOWATT
&ŝůƚĞƌ OK:ϭͲϮŽŶƚŝŶƵŽƵƐ
ŝƌƚLJĨŝůƚĞƌ: 1-3 ŽŶƚŝŶƵŽƵƐ
Detail of the connection to the CONTROL AERO-REG to enable the control of clogged filters:
3
3
CAD-COMPACT -ECOWATT
&ŝůƚĞƌ OK:ϭͲϮŽŶƚŝŶƵŽƵƐ
ŝƌƚLJĨŝůƚĞƌ: 1-3 ŽŶƚŝŶƵŽƵƐ
CONTROL AERO-REG
(ĐĐĞƐƐŽƌLJ)
Filter (ǻ3)
Extract
Supply
Filter (ǻ3)
GREEN / VERDE
2
1
WHITE / BLANCO
2
1
WHITE / BLANCO
GREEN / VERDE
24V
AI1
0V 0V 0V
DI2 DI1

18
6.7. REVERSE OUTDOOR AIR / INDOOR AIR SIDE
In models CADB-HE-D 04 to CADB-HE-D 33 it is possible to reverse the supply and extract air sides.
EXTRACT AIR MAINTENANCE TERMINAL BOX POSITION /
FREQUENCY CONVERTER
FRESH AIR WATER CONNECTIONS
DEFAULT CONFIGURATION (factory supplied) SYMMETRICAL CONFIGURATION (configuration on site)
To carry on this modification it is necessary to make the following modifications to the unit:
1. Exchange the supply and extract filters as well as the access covers to the filters.
2. Replace the labels that identify the function of the air inlet/outlet. To do this, a new set of labels is
supplied with the unit.
3. Replace the electrical connection label existing in the back side of the electrical terminal box with the
one symmetrical label supplied in the accessory bag.
4. Only in cold climates where by-pass is used as part of the defrost strategy of the heat exchanger:
Reverse the direction of the by-pass so that it remains at the supply of the unit.
Fig. 1 Fig. 2
Fig. 3
Fig. 5
Fig. 4
1. Disconnect the heat recovery unit.
2. Remove the side panel (fig.1).
3. Extract carefully the bypass (fig.2).
4. Disconnect the electrical connector that feeds the bypass.
5. Turn the bypass according to image (fig.3 and 4).
6. Reconnect the electrical power connector of bypass.
7. Place the bypass in its housing again (fig.5), close the panel and start up the unit.

19
7. INSPECTION, MAINTENANCE AND CLEANING
7.1. FILTERS REPLACEMENT
The registers ubication for filters maintenance depends on the model and version. The exact ubication
of the filters is identified by a label in the profile that indicates the type of filter and its characteristics.
FALLING OBJECTS
By loosening the screws that hold the panels, they will be released. In units installed in
ceiling, pay special attention to this operation to prevent the fall of a panel. During the
maintenance signaling the area below the heat recovery unit and prevent personnel ac-
cess to it.
Access to filters is done by removing the two registration panels located on the side of the heat recovery
unit. To replace the filters, follow the following sequence:
Fig.3Fig.2Fig.1
1. Access to the filters is done by removing the two existing side panels on the side where the electrical
cabinet is located (Fig.1).
2. Remove the 4 screws that fix the filter access panel. Hold the panel preventing it from falling when
loosening the last screw. (Fig 2).
3. Pull the dirty filter outwards, sliding it on the existing guide.
In the process of assembling the new filter, follow the reverse order, paying attention to the arrow that
defines the direction of the air that you will find in the new S&P filter.
Filters spare parts table
Model Accessory filters and spare parts for CAD COMPACT*
G4 M5 F7 F9
CAD COMPACT 500 AFR-CAD COMPACT 500 G4 AFR-CAD COMPACT 500 M5 AFR-CAD COMPACT 500 F7 AFR-CAD COMPACT 500 F9
CAD COMPACT 900 AFR-CAD COMPACT 900 G4 AFR-CAD COMPACT 900 M5 AFR-CAD COMPACT 900 F7 AFR-CAD COMPACT 900 F9
CAD COMPACT 1300 AFR-CAD COMPACT 1300 G4 AFR-CAD COMPACT 1300 M5 AFR-CAD COMPACT 1300 F7 AFR-CAD COMPACT 1300 F9
CAD COMPACT 1800 AFR-CAD COMPACT 1800 G4 AFR-CAD COMPACT 1800 M5 AFR-CAD COMPACT 1800 F7 AFR-CAD COMPACT 1800 F9
CAD COMPACT 3200 AFR-CAD COMPACT 3200 G4 AFR-CAD COMPACT 3200 M5 AFR-CAD COMPACT 3200 F7 AFR-CAD COMPACT 3200 F9
CAD COMPACT 4500 AFR-CAD COMPACT 4500 G4 AFR-CAD COMPACT 4500 M5 AFR-CAD COMPACT 4500 F7 AFR-CAD COMPACT 4500 F9
* In serial, the units are supplied with F7 as standard and M5 as extraction. All models allow the assembly of a second filter
inside, obtaining, among others, the following combinations: F7 + F9, M5 + F7 or G4 + F7.
7.2. ADDITIONAL FILTER INSTALLATION
The heat recovery is supplied with mounted filters.
Low pressure F7 filter for supply air and M5 for extract air.
Inside the heat recovery unit there is a specific rail for mounting a second additional filter (supplied as
an accessory).

20
7.3. HEAT EXCHANGER
To perform the heat exchanger cleaning it is necessary to remove it from the unit. The disassembly can
be easily done from the lateral panel:
Core disassembly sequence per side
To disassemble of the heat exchanger follow the following sequence:
• Loosen the screws that hold the side panel. Before releasing the panel, ensure that it is well suppor-
ted by the operator, preventing it from falling (Fig. 1).
• Remove the bypass assembly, releasing its electrical connector (Fig. 2).
• Pull the heat exchanger until it is completely removed from the equipment (Fig. 3).
Fig.1 3.giF2.giF
7.4. FANS
It is not necessary to access the fan to carry out maintenance tasks, nor to carry out the electrical
connection since both fans are wired to the electrical cabinet. However, it is necessary to leave enough
space around the equipment so that it is possible to access the fans in the event of their failure. Do not
install the heat exchanger against a wall or an obstacle that prevents access to the fans.
In case of need to replace the fan, follow the following sequence:
• Remove the access panel for the affected fan (Fig. 1).
• Release the screws that lock the metal plate on which the fan is mounted (Fig. 2).
• Pull out the plate and once outside, remove the fan and proceed to replace it (Fig. 3).
)LJ )LJ )LJ
7.5. CONDENSATION DRAINPIPE
Inspect the drainpipe regularly and make sure it is not blocked, if this is the case, remove the obstruc-
tion.
Check that the drain pipe was done according to the indication included in the point CONNECTIONS of
this manual.
The siphon should always be full of water. Check its level periodically, refilling it if necessary. An empty
siphon can cause the condensate tray to overflow and water leak through the equipment enclosure.