Remak X Series User manual

INSTALLATION AND OPERATING INSTRUCTIONS
Modular air-handling units
X
Series
11/2022

2
Contents
General information
Air-handling units REMAK series X are manufactured in accordance with valid Czech and European regulations and technical
standards.
Due to the concept of air-handling units REMAK X series, these including their individual parts, are not intended for
direct sale to end users. Every installation must be performed in accordance with a professional project created by a qualified
ventilation designer who is responsible for the proper selection and dimensioning of components concerning their suitability
for a given application.
Air-handling units REMAK series X (or units) must be installed and used only in accordance with this documentation. The
manufacturer is not liable for any damage caused by devious usage and in case of vialation buyer bears all risks.
The installation and operating instruction must be available for the operating and servicing staff (it is advisable to place this
instruction in the air-handling unit vicinity).
Units containing water heater sections and/or sections with drain pans must be installed in a way which prevents any
accidentally caused damage (e.g. exchanger freezing, condensate drainage not working). It is recommended to install the units
in a machine-room with waterproof floor and/or floor trap.
When handling, installing, wiring, commissioning, repairing or servicing the units, it is necessary to observe valid safety
regulations, standards and generally recognized technical rules. In particular, it is necessary to use personal protection means
(e.g. gloves) due to sharp edges and corners
All connected equipment must comply with the respective safety standards and regulations.
Commissioning as well as every service and maintenance must be noticed in the unit Operations logbook (see Warranty
and complaint conditions Remak a.s.)
Any changes or modifications to individual components of the REMAK X series air- handling units which could affect their
safety and proper functioning are forbidden.
Before installing and using the REMAK X series air handling units, it is necessary to familiarize yourself with and observe
the directions and recommendations included in the following chapters.
Commissioning may only be performed by an authorized company licensed personnel in accordance with generally and
locally valid regulations.
In case of components and materials disposal, it is necessary to adhere to all locally valid environmental and waste disposal
regulations.
In the case of total unit liquidation, all principles of waste separation must be observed.
Up-to-date version of this document is available at website www.remak.eu
Use and operating conditions .........................................................................................................................................................................................3
Air-handling unit construction .........................................................................................................................................................................................3
Information and safety labels ..........................................................................................................................................................................................3
Unit access side ...................................................................................................................................................................................................................3
Packing and transport .......................................................................................................................................................................................................3
Transport and handling of parts......................................................................................................................................................................................3
Storage conditions..............................................................................................................................................................................................................4
Installation..............................................................................................................................................................................................................................5
Rotary heat exchanger/regenerator section (ROV).................................................................................................................................................7
Unit bocks assembly.......................................................................................................................................................................................................... 8
Accessories assembly, roof assembly...........................................................................................................................................................................8
e condensate drainage..................................................................................................................................................................................................8
Air duct connection.............................................................................................................................................................................................................9
Connection of heating and cooling media...................................................................................................................................................................9
Connection of water and glycol exchangers ..............................................................................................................................................................9
Připojení přímých výparníků.............................................................................................................................................................................................9
Připojení elektrických zařízení a prvků MaR............................................................................................................................................................10
Připojení motorů (ventilátory) ......................................................................................................................................................................................11
Electromagnetic compatibility (EMC)........................................................................................................................................................................11
Door panel settings - full-fledged hinges ..................................................................................................................................................................11
Commissioning and putting into operation.............................................................................................................................................................12
General Inspection prior to first unit Start-Up........................................................................................................................................................13
First Start-Up checks.......................................................................................................................................................................................................14
Operating rules..................................................................................................................................................................................................................14
AHU Inspection and maintenance ..............................................................................................................................................................................15
Periodical checks..............................................................................................................................................................................................................14
Cleaning ...............................................................................................................................................................................................................................16
Inspection/checks ............................................................................................................................................................................................................16
Service, Spare Parts........................................................................................................................................................................................................20
Disposal and recycling ....................................................................................................................................................................................................21

Modular air-handling units, Series X
3
Use and operating conditions, Air-handling unit construction, Packing and transport
Use and operating conditions
REMAK series X air-handling units are designed for
comfortable air-handling and air-conditioning in an air flow
range from 1,000 m3/h to 35,000 m3/h at fan air pressure
difference of up to 2,500 Pa.
They are intended for handling of air without solid, fibrous,
sticky, aggressive, respectively explosive impurities. The air
must be free of corrosive chemicals or chemicals aggressive
to zinc and steel, respectively aluminium.
REMAK series X units are supplied with factory-installed
base-frame and are primarily intended for installation on floor
or steel support construction/frame supplanting the floor.
REMAK series X air-handling units can be used without any
additional measures in normal environments (IEC 60364-
5-51, resp. ČSN 33 2000-5-51 ed. 3, ČSN 33 2000-1 ed.2)
and in rooms with extended ambient temperature ranging
from -40 °C to +40 °C. When selecting the air-handling unit,
it is necessary to take into account the temperature and
humidity of the inlet and outlet air in relation with the ambient
temperature and humidity. It is especially necessary to analyze
the relation of the unit‘s casing classification pursuant to EN
1886 and the risk of condensation, respectively frost deposit.
Ingress protection (objects, water) is IP 44. IP 44 protection
level does not refer to accessories and control components
(they must be assessed separately based on their particular
documentation).
The unit equipped with the outdoor roof is water spray proof
(rain up to 60° from vertical) and providing the particular
instructions specified further are followed, the unit can be
used outdoors.
Air-handling unit construction
Unit construction is modular with casing consisting of panels,
bars interconnected by plastic or metal corners and screws.
Panels which are expected to enable occasional service access
to the internal components are provided with grab handles to
make handling easier.
For regular service purposes such as replacement of filter
inserts, cleaning of internal components, etc, selected
sections are provided with latch-hinges or with swivel locks.
All panels are of sandwich construction with anti-corrosion
surface treatment; side panels with a total thickness of 50
mm, bottom and upper panels are 60 mm thick.
The panels are made of steel sheets – galvanized steel sheets
(inner and outer skins) or painted steel sheets (inner, outer or
both skins), or stainless steel sheets (inner skin only).
The steel sheets are primarily 0,8 mm thick, continuous hot-dip
galvanized EN 10 346 Z275 g/m2, corrosion resistance for
C2 environment class as per EN ISO 14713.
Painted panels are made of continuous hot dip galvanized
steel sheets EN 10 346 Z275 g/m2 + 25 µm polyester paint
(corrosion resistance RC3 according to ČSN EN ISO 14713-1),
or polyester powder coated RC4).
The inner panel insulation is made of 50 or 60 mm thick
fireproof mineral wool with 50 or 65 kg/m3 density. Self-
adhesive sealing with temperature resistance from -40 °C
to +80 °C and water absorption below 5%, is applied on the
contact surfaces of panels. Casing parts are sealed with a
silicone-free sealant of temperature resistance from -40 °C
to +80 °C.
The REMAK series X air-handling unit consists of sections.
The section consists of the casing and inner modules/
components. The unit sections can be factory-assembled to
so-called „transport- installation“ blocks.
Door hinges
Door panels are equipped with latch-hinges : which can
function as a latch or as a door hinge.
Each door panel is equipped with one (top) latch- hinge on
each side with an additional safety function (pressure relief)
to prevent it from opening. To open the door, it is always
necessary to unlock (see Fig.1).
Each latch-hinge is equipped with a simple locking function
against accidental opening i.e. with a hex key lock, which
locks the latch-hinge against tilting (see Fig. 2).
ATTENTION: Door latch-hinges enable the entire panel to
be removed. Before doing so , respect the panel weight and
other possible risks with its handling!
ATTENTION: The door panels closing the electrical
equipment are provided with an additional bonding via PE
conductor!
Information and safety labels
Each block is provided with a product label
REMAK series X air-handling units, respectively particular
sections, are provided with information labels indicating
information important for connection, commissioning and
operation.
The „Caution - other Danger“ label situated on
the particular unit service panels indicates the
hazard of getting caught by moving parts
The label „Warning – Electric shock hazard“
on the particular sections and their service panels
alerts the risk of accident caused by electric current
Product label contains technical parameters of the
particular section. The user is obliged to ensure that all unit
labels stay undamaged and readable throughout the entire
unit service life. When damaged, especially in case of safety
labels these must be repaired immediately.
Fig. 2 – lockingFig. 1 – security latch
hex key 4 mm

4
Transport and handling of parts
Fig. 3 – transport leg and its disassembly
Packing
A block without a base-frame is placed on a pallet as
a transportation standard. A block with a base frame and
fixed legs is shipped as standard without a pallet (Fig. 2).
Blocks with the base frame and without the fixed legs can
be equipped with removable factory installed single-use
sheet metal legs, intended for handling during dispatch and
transport (Fig. 3) or these can be put on a pallet.
ATTENTION: demountable sheet metal legs for dispatch
and transport, have to be dismantled before placing the
section on the installation site - 4 x M8 screw (Fig. below).
REMAK X series transport blocks are packed in PE foil,
and if appropriate, provided with cardboard and polystyrene
protection.
ATTENTION: Fixing of the REMAK X series units by means
of car straps and bands is possible transversely only or it is
necessary to use a sufficiently strong spacer which prevents
the casing deformation – see Fig below.
Transport and handling of parts
Units REMAK X series are delivered to the installation site
in the form of transport blocks which can be also stacked
(see chapter Stacking) .
The loading and unloading can be performed by a fork-lift
truck (pallet or transport orifice in the base-frame) or a crane
(suspension orifice in base-frame corners)
If lifted by a crane, spacer bars must be inserted between
the lifting ropes to prevent unit damage.
When handling a unit section without a base frame fork-lift
truck, forks of a sufficient length must be used to ensure that
the lifted section sits on the forks completely.
When handling the unit section with a base frame then
forks must be inserted beneath both frame beams.
If the unit section width is over 1000 mm then the
base-frame is provided with the third or even fourth inner
longitudinal beam.
These additional beams are also load-bearing and when
handled by means of a fork-lift truck (from both the front or
rear side), it is sufficient that the forks reach the outer and
inner beam i.e. 900 mm.
In a similar way beams are added the to the base-frames
of sections where the service side is protruded (e.g. water
heater section with covered inlet pipes).
Unit access side
Units' construction enables the energy/media connections
and service access of the particular sections to be combined/
placed at different unit sides. The connection side is always
understood in the airflow direction (Fig. 1).
Packing and transport
Stacking
Transport blocks of REMAK series X units up to the cross
section of 1100 x 1100 mm are allowed to be stacked
providing the following rules are followed:
Max. two blocks may be stacked upon each other
ATTENTION: separation layer (e.g. robust cardboard) must
be placed between the blocks to prevent collateral damage
The block placed in the upper position can be equipped
with the base-frame, the legs of any type cannot be mounted
at least one edge of the upper section base-frame (front or
rear) must be aligned with the corresponding edge of the
lower section to ensure the weight distribution; separation
layer (e.g. robust cardboard) is also a must.
The section placed on the upper position must not overlap
in any direction over the lower one.
The fan and gas heater sections must be always situated
down.
Plate and rotary heat exchanger sections cannot be
stacked.
Fig. 2 – transport of sections
Fig. 4 – fixing by means of straps
fixing by car straps - lengthwise
ATTENTION:
lengthwise fixing is allowed
with crossbars only
fixing by car straps - crosswise
Fig. 1 – unit access side options
top view
air stream
direction
LEFT configuration RIGHT configuration

Modular air-handling units, Series X
5
Storage conditions, Installation
Fig. 6 – minimal service access space
When handling the units in the above-described way, it is
always necessary to check the centre of gravity by lifting the
unit slightly (the centre must always be above the forks) and
to be highly cautious during entire handling.
ATTENTION: When transporting, respectively handling, it
is always necessary to pay increased attention to the parts
(pipes, electric wiring elements) protruding from the sides
of transport block.
ATTENTION: All transport blocks may be transported and
handled only in their normal operating position!
ATTENTION: Increased attention must be paid to the
safety of persons as well as the product when handling
the rotary heat exchanger which is very unstable due to its
dimensions (tall and narrow), weight, and high positioned
center of gravity. The manufacturer always recommends
fixing the position of the rotary heat exchanger by
suitable roping, if it is not assembled to the other unit
blocks!
The rotary heat exchanger can be stored, transported or
handled ONLY in the vertical position. Any tilting results in
rotor misalignment and damage. If the dimensions of the
rotary exchanger section exceed the height of the lorry, it is
necessary to cover it with an additional tarpaulin.
All single piece rotary exchangers are equipped with
registered tilt indicators, and starting from a certain rotor
diameter also by the impact indicators. The intactness of
these indicators is a condition of the warranty validity.
Storage conditions
As standard, the air-handling units are packed in PE foil.
These must be stored indoors complying with the following
conditions:
Maximum relative air humidity must not exceed 85 %.
Ambient temperature must range from -20 °C to +40 °C.
ATTENTION: moisture must not condense on the surface
and inside the unit, e.g. during a rapid change in temperature
and humidity of the surrounding air which would subsequently
reach the dew point (intensive, unsightly surface oxidation of
the galvanized layer may subsequently occur)
The air-handling unit must be protected against dust,
gases and caustic vapours, or other chemical substances
which could cause corrosion of the unit’s structural parts
and components.
The air-handling unit must not be exposed to the effects
of weather and direct solar radiation
Sections of air-handling units REMAK X series may only
be stored in their operational position.
Installation
Installation site / plane
Unit blocks must be assembled - horizontal/leveled, so
in case of a unit installed on the base-frame with or without
fixed base legs, the installation site must be strictly leveled
and flat. Maximum misalignment of the floor or supporting
structure intended for the air-handling unit installation must
not exceed 1 mm per 1 meter. When using the adjustable
legs intended to floor unevenness compensation, the max
floor unevenness cannot exceed -20 up to +5 mm. Due to
the loading limit the leg tilt must not exceed 10°.
Observance of these conditions is essential for installation
as well as for the air-handling unit operation.
The air-handling unit equipped with an integrated base-frame
does not need any special anchoring.
It is advisable to ground the air-handling unit with grooved
rubber stripes (not part of delivery)
ATTENTION: while installing the rotary exchanger section
(ROV) it is necessary to adhere to the horizontal position of
the frame which affects the rotation of the rotor and the
tightness of the section (prevention of rotor misalignment).
Space for service access
When planning the air-handling unit location, it is
necessary to ensure the sufficient space for maintenance and
service (including potential extension of internal components
to the service side) . The needed space depends on the
particular unit section configuration (internal modules) - see
Fig. 6
Minimal distance to the walls is following:
750 mm: filter
0,8 x width (W): fan section
1,15 x width (W): heater, cooler, drop eliminator, plate heat
exchanger, rotary heat exchanger
For common service, maintenance, and guarantee repairs,
it is necessary to ensure access to the rotor of the rotary
heat exchanger from both front sides (access from the
adjacent sections). Should this not be possible due to the
unit configuration, it is also necessary to ensure a possible
extension of the whole section out of the unit assembly.
Installation setup
Prior to installation following actions must be performed:
check of the rotary parts free rotation (fans, dampers,
rotary heat exchanger) disassembly of the block transport
legs (see chapter “Transport”
Fig. 5 – handling options

6
Rotary heat exchanger/regenerator section
(ROV)
ATTENTION: In order to avoid dynamic load on the rotor
during transport, the rotor of the despatched exchanger is
fastened by means of removable parts. The rotor fasteners
must be removed before the final exchanger assembly into
the AHU .
ATTENTION: While installing, it is a must to adhere
to the horizontal position of the base frame and the rotor
vertical position (ROV). Failure to do so shall cause the rotor
misalignment and affects the tightness and lifetime of the
entire section..
It is recommended to connect the exchanger to the
other sections first from one side (see chapter Connecting
the unit sections) and to check its vertical position. The gap
between the rotor and its sealing on the circumference must
be even and the rotor has to spin freely (no signs of friction
at any position).
The rotor misalignment can occur due to improper
handling, transport, or improper installation.
ATTENTION: If the misalignment prevents the free
rotor spinning , the rotor must be re-centered - contact the
Remak service.
Gas heating section
Installation, commissioning and inspection of the section
with indirect gas-fired heating as well as of burner are
described in detail in a separate designated Operating and
assembly instruction , which is a part of the accompanying
unit technical documentation.
For correct, trouble-free and safe operation, it is necessary
to connect the safety and control elements that are supplied
with the section.
The gas heating section must be connected to the
ventilation duct with flexible connector temperature resistant
up to 200 °C.
Connection to the smoke flue must comply with all norms
and standards of the given state and must be performed by
a professionally certified company. The flue is not included
in the delivery.
Incaseofbeingaburneroperatedoutdoorsinthetemperature
range -20 °C to -40 °C, a special heated burner cover and a
burner with a flange for external air supply must be installed.
Fig. 10 – Rotary heat exchanger with(out) head panels
(a)
Fig. 9 – mounting of legs to the base frame
front
panels (b)
no panels
check of the power supply and other media (according to
the project and technical specification of the delivered unit)
ATTENTION: Any faults must be removed before starting
the installation.
Blocks identification
Each block sheet contains information to which unit the
particular block belongs, the block designation and its
graphically marked position in the unit layout.
Base legs installation
By virtue of safety and transport, the fixed or adjustable
legs may not be mounted
and it is necessary to install
them on the site (it has to
be done before final set-up
and connection to the other
blocks).
To mount the fixed or
adjustable legs to the base
frame, lift and place the
section or block on spacer
(eg. wooden timber, bricks,
etc. of sufficient height
according the height of leg
and space needed for mounting)
Attention: Spacer must be stable to prevent the section
from tipping over.
Screw the fixed or adjustable legs with 4 M8 × 25 screws,
via a fan/tooth and a wide washer to the pre-installed M8
self- clinching nuts in the section base frame – the fixed legs
mounting screws are included loose (fig 9).
Unit blocks assembly
Fig. 7 – sheet with unit sections and parts identification
Fig. 8 – fixed leg

Modular air-handling units, Series X
7
Unit blocks assembly
Fig. 11 – inner/outer position of self- aligning connectors
outer position of
self-aligning connector inner position
of self-aligning connector
Fig. 12 – sections connection (connectors + M8 screw)
nut and screw M8
(connection set )
Burner being operated outdoors in the temperature
range 0 °C up to -20 °C must be equipped with cover and a
thermostatically controlled heating cable has to be installed.
This set is standardly part of the delivery.
A combustion chamber condensate drainage (½“ pipe) is
installed In the rear part of the section. In the case of outdoor
installation, the drainage freezing has to be prevented. A flue
drainage also has to be ensured.
Installation of a closed heated burner cover
The external air supply for the burner is to be made by means
of flexible duct. To pass the flexible duct through the cover,
a hole is to be made at the appropriate place, in which the
hose has to be sealed. The air intake must be out of the
heated space.
The TBW 500 burner cover heater has to be attached to
the heater panel under the burner valve block using a mount
(enclosed with 4 screws). The electrical connection is to the
7-pin burner connector. The heating power supply is taken
directly from the burner and therefore it is necessary that
the terminal "L" in the burner is always under voltage . The
thermostat in the burner cover is set to a temperature 5 °C.
When the temperature in the cover falls below the set value,
the heating is switched on.
Unit blocks assembly
General information
Assembly of the individual unit sections is performed using
the self-aligning connection set, screws and M8 nuts. On the
sections outer front and rear sides there are factory installed
self- aligning connectors (in case of units with air currents
side-by-side arrangement the rear self-aligning connections
are installed inside the section). When the blocks are put
together the connectors fit into each other. Sealing 50 x 8
mm is factory installed on the block's contact surface.
Based on the current site layout the block connectors can
be relocated to the casing inner side where the M6 rivet nuts
are factory installed.
ATTENTION: When changing position of the self-aligning
connectors (inner–outer), always screw the original M6
screws back into the loose holes.
Blocks assembly procedure
Mating sides (with sealing) of the individual blocks
constituting the air-handling unit have to be pressed together
ATTENTION: Check the state and intactness of the
factory installed seal before pressing the section together
ATTENTION: it is absolutely necessary to align the
sections vertically (spirit level) and horizontally before you
press and screw them together (alignment of the sections
has a fundamental impact on the connection quality and
tightness as well as on the subsequent flawless unit function
as a whole).
Aligned and pressed together sections are screwed using
the preinstalled self-aligning connectors and tightened
by means of M8 screw and nut (M8 x 35 allen head) - M8
screws and nuts are put in the factory installed self-aligning
connectors - see fig. 12.
Rotary exchanger/regenerator
external connection - procedure
ATTENTION: it concerns only sections that protrude
the unit width
After pressing together and aligning, tighten the
connection by means of the preinstalled rectangular
sheet metal couplings and M8 screws with washers into
the prepared holes in the front panels of the rotary heat
exchanger.
Rectangular sheet metal couplings are factory pre-
installed on the rotary heat exchanger section.
Unscrew the self-aligning connectors mounted on the
adjacent blocks and sheet metal couplings are connected
to their holes. Disassembled couplings can be used for
possible internal connections.
Component Place of installation
Pt100 – flue-gas
temperature sensor
to the flue-gas exhaust
(flue-gas duct)
it must be installed
during device as-
sembly
ESD3J – triple ther-
mostat
gas heater section
(behind the heat ex-
changer, following the
airflow direction)
installed by the
manufacturer
TH 167 – emergency
thermostat
just preceding the gas
heater section
it must be installed
during device as-
sembly
Table 1 – included M&C components

8
Fig. 16 – outdoor roof parts connection
part 1
lower flange
part 2seal EPDM 15x3
higher flange
Procedure for connecting the roof parts
– AHU branches arranged side-by side
Sections of the outdoor units with the branches (air currents)
side-by-side arrangement are standardly equipped with
factory installed roof.
Roof parts of sections positioned in series,need to be
standartly connected according to the corresponding
procedure (see procedure - sections connected in series).
At mechanically connected sections/branches positioned
side-by side/in parallel a small gap occurs between their
roof parts.
This gap has to be sealed using enclosed PU sealant (PU
sealant, it is part of the supplied assembly kit).
e condensate drainage
Sections (cooling, plate heat exchanger, steam
humidification, etc.) with installed sloped stainless steel drain
pans to drain condensate, must be fitted with a condensate
water trap/siphon kit.
Drain pans are connected through the casing by DN40
outlet which enables the drainage kit fitting. The condensate
draining kits are available only as optional accessories.
A separate condensate draining kit must be used for each
individual drainage. The condensate draining piping must be
lead into a free atmosphere, i.e. it must not be lead directly
into the closed sewerage system.
Accessories assembly
Accessories (if a part of delivery) i.e. rain louvers, outer
dampers are factory installed on the appropriate blocks as a
standard. Flexible connectors are delivered in bulk.
Accessories can be dismantled, for example, due to the
space for handling and transport - fastening with screws and
guide rails (louvers, exhaust extension).
Fig. 13 – connection by means M8 screws
and rectangular couplings
screw M8 for sections connection
oval aperture for M6 screws – sections connection
Fig. 15 – fastening with screws and guide railsрельсы)
Fig. 14 – accessories
flexible connector (DV)rain louver/exhaust extension
Unit blocks assembly, Roof assembly
Roof assembly
In case of the outdoor unit selection, sections are equipped
with factory installed outdoor roof as standard. Each section,
which after assembly is not covered by another unit upper
deck section (airstream branches above each other), is
provided with a separate roof part. After sections assembly,
the installed roof parts of the individual sections form an
intact unit roof.
Procedure for connecting the roof parts
- sections in series
EPDM 15x3 seal has to be fixed on one of the roof flanges
contact surfaces
After connecting and tightening the sections, the flange
with the seal is pressed to the flange of the counterpart
(section) and provides a tight connection
ATTENTION: before putting and tightening the sections
together the overlapping flange must be put over the counter
part flange - the subsequent correct vertical alignment of the
sections is necessary to avoid flange damage.

Modular air-handling units, Series X
9
ATTENTION: If there is a risk of freezing (eg. outdoor
installation), it is necessary to insulate the siphon and
condensate draining piping, respectively keep the ambient
temperature above freezing point, e.g. with an electric
heating cable!
Dimensioning, water trap/siphon height calculation see
fig. 17 below.
Siphon DN40 type HL 136.2 for drain pans with the option
of water refilling. To be used for over- and underpressure.
Available as an optional accessory (fig 18)
Before first startup and after prolonged shutdown of the
unit, it is necessary to fill the siphon in overpressure with
water through the plastic plug.
The height of the unit above the bottom (sum of base
frame below ůlpw height + legs + structural framework ,
etc.) must be adjusted to the required height of the siphon.
Siphon in overpressure
Location of the outlet in the air duct behind the fan (air
is forced).
Siphon in underpressure
Location of the outlet in the air duct before the fan (air
is sucked)
e condensate drainage
Air duct connection
Flexible connector (DV)
Flexible connector (DV) is always factory installed on the
respective AHU inlets/outlets.
Ventilation duct must be connected by means of a flexible
connector (DV), which prevents the transmission of vibrations
and eliminates the potential non-alignment of the duct with
the AHU outlet opening.
ATTENTION: Connected ductwork must not load /
deform the flexible connector (DV) and the unit casing.
ATTENTION: After ductwork connection and during AHU
operation, flexible connectors must not be fully stretched or
compressed (there is a risk of its damage). After connection
to the ductwork the optimal length of the flexible connector
(DV) is about 150 mm (fully stretched DV is 160 mm).
Connection of heating and cooling
media
The exchanger/coil can be connected on the unit outside
(directly to the coil header connection), or inside the unit
(prepared to the connection of the exchanger or mixing set
inside the unit casing)
Header connections are always equipped with external
thread (threaded flanges are not part of shipment)
ATTENTION: weight and dilatation forces of cooling
and heating media fittings must not impact the unit casing
ATTENTION: When connecting the feeding fittings to the
heat exchangers, use two wrenches to tighten the screws to
avoid the exchanger headers rupture by torsion.
Fig. 18 – siphon (optional accessory)
Fig. 17 – Siphon height calculation
siphon in underpressure
Hmin (mm) = P (Pa) / 10
H
2H
H: 1.000 Pa = 100 mm
siphon in overpressure
P – total fan pressure
H
2H
Fig. 19 – threaded header input/ouput for cooling
and heating media connection
Fig. 20 – connection of fittings to exchangers
When tightening the
nuts, secure the pipe with
an anti-twist wrench.

10
Air duct connection, Connection of heating and cooling media, Exchangers
Fig. 21 – exchanger´s connection
Fig. 22 – connection of glycol circuit
glycol cooler glycol heater
1) pump
2) vent valve
3) feed/drain valve
4) safety valve
5) expansion tank
6) pressure gauge
3 1 3
2 4 5 6 2
air stream
direction
(left handed
design)
air stream
direction
(right handed
design)
inlet outlet
outlet inlet
Water and Glycol Heat exchanger connection
To achieve maximal output the counter-flow connection of
the heat exchangers is required. (Fig 21)
The corresponding connection points are marked with labels
on the unit side panel (heating water inlet, heating water
outlet, coolant inlet, coolant outlet).
The water coils are equipped as standard with a manual air
vent valve G 3/8 “, mounted in the upper part of the collector
(for direct external connection it is located outside the unit).
ATTENTION: After connecting the exchanger coil (heater
and cooler, mixing set including) to the piping, it is necessary to
pressurize (fill with water) and vent the entire circuit, including
the heat exchanger. Consequently, perform a leakage check of
all pipe connections as well as the exchanger itself (including
the heater/cooler section interior check).
The manufacturer is not liable for damage caused by leaky
connections or damaged exchangers.
Direct evaporators
Direct evaporators must be connected by a professional
contractor authorized to refrigerating equipment installment.
The direct evaporators are pressure-tested and factory
filled with nitrogen.
They can be filled with the following refrigerants - R134a,
R152a, R404a, R407c, R410a, R507 (ASHRAE Number).
Local refrigerant legislation has to be always respected.
Fig. 23 – evaporator´s connection
dual circuit
inlet
outlet
single circuit
1
2
1
2
1
2
1
2
inlet
outlet
air stream direction
(left handed design)
air stream direction
(right handed design)
air stream direction
(right handed design) air stream direction
(left handed design)
Wiring and control system installation
The wiring and control system installation must be
performed by qualified professionals authorized to perform
wiring of the given type.
The wiring must be performed in accordance with locally
valid directives and standards, and in compliance with
the Installation and Operating Instructions of particular
components (frequency inverters, pressure and temperature
sensors, etc).
ATTENTION: Before switching on, it is necessary to check
the conformity of voltage, frequency and protection with
the data stated on the particular component label and the
cross-sections of the connecting cables as stated in project
documentation.
ATTENTION: an initial inspection of the electrical
equipment must be carried out before start-up (see chapter
Unit commissioning)!
Motor wiring (fans)
To ensure the proper unit function, the motors must
be connected so that they rotate in the correct direction.
The EC and PMblue motors are equipped with electronics
that ensure the correct fan rotation direction according to
the manufacturer's motor parameter settings to the given
impeller and also monitors for fault conditions; fault is
signalled by a fault contact.
AC motors are equipped with thermistors as
standard, which provide information about the faults
(overheating) of the motor to protect the motor from
overload damage (to be evaluated by the control
system). AC fans rotation direction must be ensured
by the correct motor phase connection to the mains.
These protections must be connected in accordance with
the specified wiring diagram. Fan section can be equipped
with the service switch. The service switch placement and
connection must be performed in accordance with locally