Orca FLEXI 50 User manual

USER'S MANUAL
Heat regeneration single-room reversible ventilator
FLEXI 50
V1_2021

II
These instructions are intended for technical, maintenance and operational personnel.
The operating instructions contain information on the purpose, technical details, principle of operation, design and installation
of the FLEXI 50 and all its variants.
Technical and maintenance staff must undergo theoretical and practical training in the field of ventilation systems and must
be able to operate in accordance with workplace safety regulations and construction norms and standards in force in the
country. The information in this user guide is current at the time of writing.
The company reserves the right to change the technical characteristics, shape or configuration of its products at any time in
order to take into account the latest technological developments.
No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means in any
retrieval system or translated into any language in any form without the prior written permission of the Company.

III
Content
1 SAFETY REQUIREMENTS ..................................................................................................................................1
1.1 Unit installation and operation safety precautions.................................................................................2
2 PURPOSE..........................................................................................................................................................4
3 TEHNICAL DATA ...............................................................................................................................................5
4 DIMENSIONS....................................................................................................................................................6
5 FUNCTIONING........................................................................................NAPAKA! ZAZNAMEK NI DEFINIRAN.
5.1 Ventilator design .....................................................................................................................................7
6 VENTILATOR OPERATION MODES ...................................................................................................................9
7 MOUNTING AND SET-UP ...............................................................................................................................10
7.1 Installation of the control panel with LCD display................................ Napaka! Zaznamek ni definiran.
7.2 Ventilator mounting ..............................................................................................................................11
7.3 Installing the front panel ...................................................................... Napaka! Zaznamek ni definiran.
7.4 Connection to power mains ..................................................................................................................15
7.5 Wiring diagram for the ventilator with control panel with LCD display................ Napaka! Zaznamek ni
definiran.
8 UNIT CONTROL USING BUTTONS ON THE LCD ......................................NAPAKA! ZAZNAMEK NI DEFINIRAN.
9 REMOTE VENTILATOR CONTROL ...........................................................NAPAKA! ZAZNAMEK NI DEFINIRAN.
10 MAINTENANCE ..............................................................................................................................................20
11 TROUBLESHOOTING ......................................................................................................................................35
12 STORAGE AND TRANSPORTATION REQUIREMENTS......................................................................................36

User manual FLEXI 50
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1Safety requirements
•Please read the user’s manual carefully prior to installing and operating the unit.
•All user’s manual requirements as well as the provisions of all the applicable local and national
construction, electrical, and technical norms and standards must be observed when installing and
operating the unit.
•The warnings contained in the user’s manual must be considered most seriously since they contain
vital personal safety information.
•Failure to follow the rules and safety precautions noted in this user’s manual may result in an
injury or unit damage.
•After a careful reading of the manual, keep it for the entire service life of the unit.
•While transferring the unit control, the user’s manual must be turned over to the receiving
operator.
•Before installation, check the unit for damage of the rotor, housing and grille. There must be no
foreign objects inside the housing that could damage the rotor blades.

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1.1 Unit installation and operation safety precautions
Unpack the unit with care.
Disconnect the unit from
power mains prior
to any installation
operations.
The unit must not be
grounded!
While installing the unit,
follow the safety
regulations specific to the
use of electric
tools..
Do not change the power
cable length at your own
discretion. Do not bend the
power cable. Avoid
damaging the power
cable. Do not put any foreign
objects on the
power cable.
Do not lay the power cable
of the unit in
close proximity to heating
equipment.
Do not use damaged
equipment or cables
when connecting the unit to
power mains.
Do not operate the unit
outside the temperature
range stated in the user’s
manual. Do not operate the
unit in aggressive or
explosive environments.
Do not touch the unit
controls with wet hands. Do
not carry out the installation
and maintenance operations
with wet hands..
Do not wash the unit with
water. Protect the electric
parts of the unit against
ingress of water.
Do not store any explosive or
highly
flammable substances in
close proximity to
the unit.
When the unit generates
unusual sounds, odour, or
emits smoke, disconnect it
from power supply and
contact the Seller.
Do not open the unit during
operation.
Do not direct the air flow
produced by the unit
towards open flame or
ignition sources.
Do not block the air duct
when the unit is switched
on.
In case of continuous
operation of the unit,
periodically check the
security of mounting.

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Do not sit on the unit and
avoid placing foreign objects
on it.
Use the unit only for its
intended purpose.
Do not allow children to
operate the unit..
Disconnect the unit from
power mains prior to any
technical maintenance.
The product must be disposed separately at the end of its service life.
do not dispose the unit as unsorted domestic waste.

User manual FLEXI 50
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2PURPOSE
The unit is designed to ensure continuous mechanical air exchange in houses, offices, hotels, cafes, conference halls, and other
utility and public spaces as well as to recover the heat energy contained in the air extracted from the premises to warm up the
filtered stream of intake air. The unit is not intended for organizing ventilation in swimming pools, saunas, greenhouses,
summer gardens, and other spaces with high humidity.
Due to the ability to save heating energy by means of energy recovery, the unit is an important element of energy-efficient
premises. The unit is a component part and is not designed for stand-alone operation.
It is rated for continuous operation.
Transported air must not contain any flammable or explosive mixtures, evaporation of chemicals, sticky substances, fibrous
materials, coarse dust, soot and oil particles or environments favourable for the formation of hazardous substances (toxic
substances, dust, pathogenic germs).
The temperature in the room where the indoor unit of the ventilator is installed must be in the range from +1 ˚C to +40 ˚C
with relative humidity up to 65 % (no condensation build-up). If the conditions for using the ventilator are beyond the specified
limits, turn off the ventilator and provide fresh air supply through windows. The inlet air temperature must be in the range
from -20 ˚C to +40 ˚C.
The unit is rated as a class II electric appliance and must not be grounded. Valuated ingress Protection (IP) rating from solid
objects and liquids is IPX2.
The unit design is constantly being improved; thus, some models may be slightly different from those described in this manual.
The unit should not be operated by children or persons with reduced physical, mental, or sensory
capacities, or those without the appropriate training.
The unit must be installed and connected only by properly qualified personnel after the appropriate
briefing.
The choice of unit installation location must prevent unauthorized access by unattended children.

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3Technical DATA
SPEED
FLEXI 50
I
II
III
Supply voltage (V)
230
Power consumption [W]
2.00
3.5
5.5
Total current consumption [A]
0.03
0.03
0.06
RPM [min-1]
519
1555
2330
Air capacity in ventilation mode [m3/h]
15
35
50
Air capacity in regeneration mode [m3/h]
8
18
25
Filters
G3 (option F8)
Transported air temperature [°C]
-20 do +40
Sound pressure level @ 1 m [dB(A)]
10
28
35
Sound pressure level @ 3 m [dB(A)]
1
19
26
Heat exchanger material
ceramics
Heat recovery efficiency [%]
≤ 90
Pipe diameter [mm]
160
Ingress protection rating
IP 24

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4DIMENSIONS
Overall dimensions of the indoor unit [mm]

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5Design and operating principle
The ventilator consists of an indoor assembly unit with a decorative front panel, a cartridge, an air duct with a sound absorbing
mat and an outer ventilation hood.
Cartridge is the basic functioning part of the unit. It consists of a fan, a generator and two filters that ensure primary air filtration
and prevent ingress of dust and foreign objects into the regenerator and the fan.
The indoor unit is equipped with a manually operated rotary air damper.
Attention! During closing of air damper, the ventilator continues to run, but the air flow is closed.
The protecting grille or ventilation hood must be installed on the outer wall to prevent ingress of water and foreign objects
into the ventilator.
5.1 Ventilator design

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5.2 Air damper operating principle
The indoor unit of the ventilators has a swivel damper. The vertical position of the handle corresponds to the position OPEN,
the horizontal one - to the position on CLOSED.
The indoor unit of the ventilators is equipped with an automatic air
damper. It opens at the beginning of the ventilator's operation and lets the air f1ow freely through the ventilator.
After
switching off the ventilator, the damper closes automatically. The air damper opening and closing process can take up to five-
minute s.
Caution! If the power supply is cut off during operation of the ventilator, after five minutes, the damper can be
manually moved to the CLOSED position using the handle to prevent drafts.
Later on, when the ventilator is turned on,
the damper will automatically y open.
Automatic opening/ closing of t h e damper is not provided in the indoor unit of the ventilators. The damper in these models
can only be adjusted manually using the handle regardless of the ventilator operating mode.
Caution! Air damper opening or closing does not turn the ventilator on or off!
The figure below shows the closed and open posit ions of the damper and the handle.

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6VENTILATOR OPERATION MODES
The ventilator has several operation modes:
Ventilation mode
Ventilation: the ventilator runs either in air extraction or air supply mode at a set speed.
In this mode some of the ventilators in the network run in air supply mode and the other ones in air extraction
mode, depending on the position of the DIP switch No. 3 (see section Setting the ventilator operation mode
using DIP switches).
Boost mode:
The ventilator goes to the maximum speed without changing the operation mode.
Regeneration mode.
The ventilator operates cyclically in two cycles, each of 70 seconds, with heat and humidity recovery.
•Cycle I. Warm stale air is extracted from the room and flows through the ceramic regenerator, which
gradually absorbs heat and humidity. In 70 seconds, as the ceramic regenerator gets warmed, the
ventilator is switched to supply mode.
•Cycle II. Fresh intake air from outside flows through the ceramic regenerator, absorbs accumulated
moisture and is heated up to the room temperature. In 70 seconds, as the ceramic regenerator gets
cooled down, the ventilator is switched to air extraction mode and the cycle is renewed. If two
ventilators are installed, they operate with opposite rotation directions in this mode. While one
ventilator supplies air, the other one extracts it.

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7Mounting and set-up
The figure below shows a schematic layout of the ventilator's internal elements depending on the wall thickness.
The ability to mount the ventilator in the wall depends on the length of the internal elements and the required
protrusion A. The length of the internal elements, the diameter of the required opening and the minimum wall
thickness in which the ventilator can be installed when using different external ventilation hoods are shown in
the table below.
Reference dimensions for installation of ventilators
Ventilator model or installation variant
FLEXI 50
FLEXI 50 with
minimum wall
thickness
Length of cartridge or fan and regenerator units [mm] 370 310
Hole diameter D [mm]
180
180
Minimum possible wall thickness when using EH, EH-
14, EH-13, EH-17, MWM hoods (mm)
≥360 300
Minimum possible wall thickness when using an EH-2
hood (mm)
≥260 200
If the wall thickness is less than that in the layout of the blocks inside the wall, you can unfasten the fine filter
holder and assemble the ventilator without it and without sound-absorbing material, as shown in the figure
above. With this type of installation, the recovery efficiency may decrease and the emission of street noise into
the room may increase. This will also increase the noise level of the ventilator itself.
Attention!
The appliance should not be installed in a space where
curtains and the like objects obstate air flow!
Read the users manual before installing the unit

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7.1 Ventilator mounting
1. Prepare a round core hole in the outer wall
Make one or two holes in the exterior wall according to the configuration of the ventilation system. For
efficient ventilation, the locations of ventilation systems must be as far apart as possible. When preparing
the holes, it is recommended to also prepare places for laying the electrical cable and other necessary
cables in the wall. The size of the hole and the minimum distance to the surface (eg wall, ceiling or window)
and the minimum distance between the devices are shown below.
2. Measure the air ducts of the required length
Measure the wall thickness B
The required air tube length is calculated as L = B + A.
A means the part of the air tube from the outside that is required for installation of an external ventilation
cover. Distance A is given in the instructions for installing the external ventilation cover. Cut the air tube to
length L.
Read the users manual before installing the unit
Do not block the air duct of the installed unit with dust accumulating materials, such as
curtains, cloth shutters, etc. As it prevents air circulation in the room.

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Install the air duct with the minimum slope of 3 mm downwards from the outer wall side. Fill the gaps
between the wall and the hole with a mounting foam.
3. Installation of outer ventilation hood
The mounting sequence of the outer ventilation hood is described in the installation instruction for
the ventilation hood.
4. Positioning and installation of the indoor unit
Stick the delivered cardboard master plate on the indoor wall using a mounting tape. The large opening in the
master plate must be axially aligned with the air duct. Align the master plate horizontally with a building level.
Then mark the fastening holes for installation of the supplied dowels and drill the holes to a required depth.
Route the power cable from the wall through the marked opening on the template.

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5. Remove the inner front cover
Separate the front panel of the indoor unit from its back part. To do this, unhook the latches securing the
front panel and open it as shown in the figure below.
6. Preparation of the indoor unit
Remove the three retaining screws from the left cover to enable access to the terminals. Route the power
wires through the appropriate cable glands.
7. Mounitng of the indoor unit
Fix the back part of the indoor unit on the wall with the screws supplied with the mounting kit of the
ventilator.
8. Electrical cable fixation
Route the power cable as figured below and connect the ventilator to power mains in compliance with the
external wiring diagram,see section Connection to power mains. Secure the power cable with the clamp.
9. Mounting the left cover

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After completion of the electrical connection reinstall the left cover in site.
10. Installatio of ventilation and recuperation unit
Install the cartridge or the regenerator unit and the fan unit into the air duct as figured below and connect
the connector to the board. Insert the sound-absorbing layer in the air duct. Roll the layer of the sound
absorbing material to match the air duct diameter. The protecting paper layer must be outside. Insert the
sound absorbing roll into the cartridge against stop. Make a mark at the end of the air duct, remove the
material and cut the roll as marked. Insert the ready sound absorbing roll into the air duct.
11. Installation of the front panel of the indoor unit
Install the front panel of the indoor unit.

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7.2 Connection to power mains
The ventilator is rated for connection to single-phase AC 100-240 V 50/60 Hz power mains.
For electric installations use insulated, flexible conductors (cables, wires) with the minimum cross section of 0.5
up to 0.75 mm2 for power cables and 0.25 mm2 for sensor cables. The cable cross section is given for reference
only. The actual conductor cross-section selection must be based on its type, maximum permissible heating,
insulation, length and installation method. Use copper wires for all the electric connections!
Connect the unit to power mains via the
terminal block installed in the power board (A3)
in compliance with the wiring diagram and
terminal designation.
Connect the unit to power mains through the
external circuit breaker with a magnetic trip
integrated into the fixed wiring system. The
tripping current of the circuit breaker is selected
based on the electrical characteris-tics shown
on the label of the fan casing.
The ventilator design enables connecting any
external controls with a normally opened
contact (NO contact), such as an external CO2
sensor, a humidity sensor, a switch, etc.
When the NO contact of the external device is
closed, the unit changes to the maximum
speed.
An analogue sensor with output voltage 0-10 V
is also compatible with the unit.
*The circuit breaker is not included in the
delivery set.
Switch off before any work with the appliance.
The appliance must be connected to the electrical network by a qualified electrician. The
electrical parameters of the device can be found at manufacturer's labels.
Any modification of the internal circuit is prohibited it will revoke the warranty.

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7.3 Setting the ventilator operation mode using DIP switches
Prior to operating the ventilator set it up using the DIP
switch. It is located on the controller circuit board.
To access the DIP switch, take off the front panel of the
indoor unit and uplift the rubber plug that covers the
switch.
Setting the role of the ventilator in the network
ON - slave unit (hereinafter referred to as "Slave unit")
OFF - master unit (hereinafter referred to as "Master unit")
Standby mode setup
Min - the ventilator operates at Speed I in the Standby mode.
OFF - the ventilator is switched off in the Standby mode.
Settino of the fan rotation direction*
ON –
•in the Ventilation mode the ventilator supplies the air to the room.
•in Regeneration mode the ventilator starts operating first in supply mode.
OFF –
•in the Ventilation mode the ventilator extracts the air from the room.
•in Regeneration mode the ventilator starts operating first in extract mode.
Restore factory default settings
ON –
restore factory default settings. For this purpose, move the switch on the operating
ventilator to the ON position, after the sound signal
turn the switch to the OFF position.
OFF – standard operation of the unit.
*To form an optimal ventilation mode in the room, it is recommended to use either one or an even number of networked ventilators.
The setting is carried out in such a way that during each operation interval one half of the ventilators supplies air to the room, and the
other half extracts air out of the room.

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8Ventilator control
The ventilator is operated with:
•infra-red remote control
•control buttons located on the side of the indoor unit (see the figure below)
•Vents Twin Fresh V.2 application from a mobile device (smartphone or tablet)
8.1 Ventilator control with the buttons on the remote control