VTS Medical Systems Ventus VVS021 User manual

VENTUS Compact Air-Handling Units
Operation and Maintenance Manual
DTR-VVS-ver.2.2 (01.2020)

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VTS reserves the right to implement changes without prior notice
Ventus Air Handling Units
OPENING THE INSPECTION PANELS WHEN THE UNIT IS RUNNING OR
STARTING THE UNIT WITH OPEN INSPECTION PANELS ARE STRICTLY
PROHIBITED!
BEFORE OPENING THE INSPECTION PANEL TURN OFF THE UNIT AND WAIT
TWO MINUTES SO ALL MOVING PARTS WOULD STOP!
SWITCH OFF AND PROTECT THE POWER SUPPLY TO PREVENT THE UNIT
FROM UNINTENDED STARTING
!

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VTS reserves the right to implement changes without prior notice
Ventus Air Handling Units
1 Table of Contents
1 Table of Contents ..........................................................................................................................3
1. Introduction...................................................................................................................................6
2. Application and design..................................................................................................................6
3. General Information......................................................................................................................7
4. Pre–Installation ...........................................................................................................................11
4.1. Transport and storage.........................................................................................................11
4.1.1. Receiving Checklist ......................................................................................................12
4.2. Installation Preparation.......................................................................................................12
4.2.1. Foundation ..................................................................................................................13
4.2.2. Service Access..............................................................................................................15
4.2.3. Unit Location Recommendations................................................................................15
4.3. Joining the AHU sections and connecting the ventilation ducts.........................................15
4.4. Connection of heaters and coolers .....................................................................................17
4.5. Draining out condensate.....................................................................................................19
4.6. Electric connection..............................................................................................................20
4.7. AHU components ................................................................................................................20
4.7.1. Hydronic coil exchangers.............................................................................................20
4.7.2. DX coils ........................................................................................................................22
4.7.3. Electric heater .............................................................................................................24
4.7.4. Fan’s motors................................................................................................................25
4.7.5. Air Filters .....................................................................................................................26
4.7.6. Rotary heat exchanger.................................................................................................26
5. Automation .................................................................................................................................27
5.1 Description of controls........................................................................................................27
5.1.1 Introduction.....................................................................................................................27
4.1.2 Mains switch................................................................................................................27
4.1.3 Communication port ...................................................................................................27
4.1.4 Signaling controller status...........................................................................................27
4.1.5 Simplified control panel –HMI Basic UPC...................................................................28
4.2 System Start–Up..................................................................................................................29
4.2.1 Switching on power supply .........................................................................................29
4.2.2 HMI Advanced UPC......................................................................................................30
4.2.3 Selection of operating mode.......................................................................................30

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Ventus Air Handling Units
4.2.4 Indication of operating mode......................................................................................31
4.3 Technical data .....................................................................................................................32
4.3.1 Operation parameters.................................................................................................32
4.3.2 Carel μPC controller.....................................................................................................33
4.3.3 Cabling.........................................................................................................................34
4.4 Connection ..........................................................................................................................35
4.4.1 Standard connection ...................................................................................................35
4.4.2 Power connection........................................................................................................35
4.4.3 Connection of automation elements ..........................................................................36
6. Preparation for start–up .............................................................................................................40
6.1. Electrical system..................................................................................................................40
6.2. Filters...................................................................................................................................40
6.3. Water heaters......................................................................................................................41
6.4. Electric heaters....................................................................................................................41
6.5. Water coolers, freon coolers and heaters...........................................................................41
6.6. Rotary exchanger.................................................................................................................41
6.7. Fan unit................................................................................................................................41
7. Start-up and adjustment .............................................................................................................42
7.1. Measurement of air quantity and AHU output adjustment. ..............................................42
7.2. Heat output adjustment of water heater............................................................................43
7.3. Adjustment of electric heater .............................................................................................43
7.4. Adjustment of cooler performance.....................................................................................43
8. Operation and maintenance .......................................................................................................44
8.1. Dampers ..............................................................................................................................44
8.2. Filters...................................................................................................................................45
8.3. Heat exchangers..................................................................................................................45
8.3.1. Water heater ...............................................................................................................45
8.3.2. Electric Heater.............................................................................................................46
8.3.3. Water cooler................................................................................................................46
8.3.4. Freon cooler and heater..............................................................................................46
8.3.5. Rotary exchanger.........................................................................................................46
8.4. Silencer section ...................................................................................................................47
8.5. Fan unit................................................................................................................................47
8.5.1. Fans..............................................................................................................................47

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Ventus Air Handling Units
9. Safety instructions.......................................................................................................................48
10. Information..............................................................................................................................49
11. Technical information to the regulation (U) No 327/2011 Implementing directive
2009/125/EC........................................................................................................................................50

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Ventus Air Handling Units
1. Introduction
ATTENTION: Warnings, Cautions and Notices appear throughout this document. Read it carefully:
WARNING! Indicates a potentially hazardous situation which, if not avoided, could result in
death or serious injury.
CAUTION! Indicates a potentially hazardous situation which, if not avoided, could result in
minor or moderate injury. It could also be used to alert against unsafe practices.
NOTICE ! Indicates a situation that could result in equipment or property–damage only.
In-depth familiarization with the content of this manual, assembly and operation of the air-handling
unit in line with the instructions provided and obeying all safety regulations constitute the basis of
efficient, safe and non-failure operation of the device.
Works related to unloading packages with AHUs, transportation of the packages, connecting AHU-to
the related systems as well as maintenance and repair are carried out by qualified specialists or they
are supervised by authorized staff.
The qualified technical personnel is understood as the trained specialists, who due to the
professional experience, knowledge of the subject-related standards, documentation and regulations
concerning operation and safety procedures, have been authorized to perform necessary operations
and who are able to troubleshoot any potential problems.
This operation and maintenance manual does not cover all possible variants of the units
configurations, examples of their assembly and installation as well as start-up, operating, repairing
and maintenance. If the units are used for what they are intended, this documentation and any other
materials provided with the unit contain information designed for the qualified technical personnel
only.
NOTICE ! Connection of the unit sections, connection of related systems, start-up,
operation and maintenance of the device have to comply with the directives and
regulations being in force in the country where the unit is installed.
Guarantee repairs can be carried out only by VTS Service Provider with appropriate
certificates. It is recommended to engage VTS Authorized Service Providers for
installation, start-up, maintenance and repairs of the AHU units.
This manual should always be kept handy for reference and be easily available for the
servicing personnel.
2. Application and design
The 8-size product line is designed for
recuperation, cooling or/and heating load
conditions of the air flow range 1200–16000
m3/h. The VENTUS air-handling units are
designed for a ventilation system where an
access to the rotating parts of the unit (a fan’s
rotor) is feasible neither from the overpressure
nor sub atmospheric pressure side of the unit.
The ventilation system is understood as
ventilating ducts as well as e.g.: air intake and
air exhaust modules in case of the units
installed outdoor.
AHUs are equipped with a wide range of
functional sections which offers extensive
possibilities of realizing the air treatment
process in the field of such parameters as
temperature (heat recovery, heating: water of
electric heaters, cooling: water or freon
coolers), filtration, primary and secondary
filters as well as noise level reduction.
The basic is the recovery heat exchanger
section with the fans. The table 1 is showing
the list of symbols and functions of the
sections.

Table 1. Functions codding
Symbol
Graphic
Function
Options of functions
F
Air filtration
M5,F7, F9
C
Cooling (hydronic or dx)
Rows: 2, 3, 4, 6
H
Heating (hydronic)
Hot Water –rows: 1, 2, 3, 4
S
Silencer
Standard size
R
Recovery with rotary exchanger
Standard size
3. General Information
The core of the VVS 21-150 compact units is
the section with recovery heat exchanger. It
consists (Fig.2) form filters (1), recovery
heat exchanger (2) (rotary regenerator or
counter flow plate heat exchanger) and fans
(3). That main section is available also with
mixing chamber and with fans placed on one
or both sides of recovery heat exchanger.
Depend on the AHU size and selection it can
be one, two or four direct driven fans. All
with high efficient EC motors.
For the core can be add additional section
for heating, cooling, filtering and noise
reducing.
Fig.1. Example of the basic section: 1 –panel filter, 2 –rotary regenerator, 3 –direct driven fans,
4 –mixing damper

Majority of AHUs configuration is available in
left-hand (LH) and right-hand (RH) version
(fig. 2). The version of the unit is determined
by the flow direction of the air against the
tending side of the unit (the side where the
inspection panels are located). In case of
supply-exhaust units the version is determined
by the flow direction of the air in the supply
section.
Left-hand version Right-hand version
Fig. 2a. Access side of the VVS 21-150 AHU –supply down
Fig. 2b. Access side of the VVS 21-150 AHU –supply upper
Supply air flow direction
Supply air flow direction

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Fig. 3a. Examples of Compact AHU sections - Rotary heat exchanger section
Fig. 3b. Examples of Compact AHU sections –Heater + Cooler section

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Ventus Air Handling Units
Table 2. Functionality and dimension of the sections
AHU size
Unit
R2
R1
F9
Hw
C(2-
4R)
C(6R)
Hw(1-
2R)
C(2-4R)
S
E
W
H
H1
L
[mm]
VVS021
967
901
448
1040
1040
240
240
370
550
550
1065
550
VVS030
967
1165
580
1120
1400
240
240
370
550
550
1065
550
VVS040
1174
1165
580
1120
1400
240
240
370
550
550
1065
550
VVS055
1345
1435
715
1040
1240
240
240
630
630
630
1065
630
VVS075
1486
1675
835
1120
1400
240
240
630
630
630
1065
630
VVS100
1666
1875
935
1040
1240
240
240
830
830
830
1065
830
VVS120
1897
1949
972
1040
1240
240
240
830
830
830
1065
830
VVS150
2091
2151
1073
1040
1240
240
240
850
850
850
1065
850
R2
Rotary heat exchanger section (fans on one side of the rotor)
R1
Rotary heat exchanger section (fans on both sides of the rotor)
F9
Filter section
HW
Water heater section
C(2-4R)
Cooler section (2 , 3 or 4 rows of the coil)
C(6R)
Cooler section (6 rows of the coil)
HW(1-2R)C(2-4R)
Water heater and cooler section (1, 2 rows of the heater, 2,3,4 rows of the cooler)
S
Silencer section
E
Empty section

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Ventus Air Handling Units
4. Pre–Installation
4.1. Transport and storage
The air handling units are packaged for easy
handling and storage on the job site. Upon
delivery, inspect all components for possible
shipping damage. See the “Receiving
Checklist” section for detailed instructions.
VTS recommends leaving units and
accessories in their shipping packages/skids
for protection and handling ease until
installation.
The devices should be unloaded and
transported to the AHU’s installation site using
a hand lift or forklift (fig.4a) or a crane (fig.4b).
Fig. 4a. Using a hand lift to transport the unit
Fig. 4b. Transport with the use of a crane
The AHUs have to be transported in their
working position and they shall not be stored
one on the other. For transport of the units
VVS 21-150 with the crane, the holes in the
base frame supports can be used in order to
mount an appropriate pipe bar.
The Units and its sections are intended for
indoor storage. If indoor storage is not
possible, VTS Company recommends the
following provisions for outdoor storage:
Place the unit(s) on a dry surface;
ensure adequate air circulation
beneath unit and to assure that no
portion of the unit contacts standing
water at any time.
Cover the entire unit with a canvas
tarp only. Do not use clear, black, or
plastic tarps
The units and their components should be
stored in rooms characterized by the following
conditions: relative humidity: φ < 80 % at t
(temperature) = 20ºC ambient temperature: –
40ºC < t < +60ºC – the devices should be out
of the reach of any caustic dust, gas or steam
as well as any other chemical substances
which may have pro–corrosive influence on
the unit and its components.
While storing the unit, its plastic packaging
must be unsealed.
NOTICE! Packages onsite must be
stored on hardened, dry and protected
against any precipitation place.
Packages containing AHU elements
should be stored away from places
where operate mechanical devices
(vehicles, cranes and other construction
machinery). They should be stored in
places where they will not be subject to
any mechanical damages, humidity,
aggressive chemical agents, fluids, dusts
and other external agents which may
deteriorate their condition.

4.1.1.Receiving Checklist
Complete the following checklist immediately after receiving unit shipment to detect possible shipping
damage.
Inspect individual crates before accepting.
Check for rattles, bent crates corners, or
other visible indications of shipping
damage.
If a unit appears damaged, inspect it
immediately before accepting the
shipment. Make specific notations
concerning the damage on the freight bill.
Do not refuse delivery.
Inspect the unit for concealed damage
before it is stored and as soon as possible
after delivery. Report concealed damage
to the freight line within the allotted time
after delivery. Check with the carrier for
their allotted time to submit a claim.
Do not move damaged material from the
receiving location. It is the receiver’s
responsibility to provide reasonable
evidence that concealed damage did not
occur after delivery.
Do not continue unpacking the shipment if
it appears damaged. Retain all internal
packing, cartons, and crate. Take photos
of damaged material if possible.
Notify the carrier’s terminal of the damage
immediately by phone and mail. Request
an immediate joint inspection of the
damage by the carrier and consignee.
Notify your VTS representative of the
damage and arrange for repair. Have the
carrier inspect the damage before making
any repairs to the unit.
Compare the electrical data on the unit
nameplate with the ordering and shipping
information to verify the correct unit is
received.
NOTICE! Any damages caused by
improper transportation, unloading or
storage are not covered by the Warrantee
and any claims laid by way of
aforementioned issues will not be
examined by VTS.
4.2. Installation Preparation
The Ventus Compact air-handling can be
installed as well as inside the building as the
outside. Units can be installed and work on the
external air with temperature from -40°C to
+60°C.
AHUs installed outside the building should be
equipped with roof and air intake and outlet
equipment. The unit operated outdoor should
be regularly cleaned from the snow. Such units
should have barrier for protect against the
snow, and base frame should be placed on the
level not lower than height of snow level in that
region.
In condition of the low temperatures, increase
the heat lost, what can needs more reserve of
the heating capacity of the heaters. The heat
node of the heating capacity regulation, three
way valves, water pumps, thermo-
manometers, valves, as well as frequency
converters should be placed in the room with
temperature higher than +5°C.
If the unit operate with the low inlet
temperature of the air it is recommended to
use the mixture of the glycol (up to 45%) as the
heating medium. All installation pipes of the
water heating, condensate drying, hydraulic
valves should be well isolated. The best is use
the pre-heater before the heat recovery
section.
The air damper actuators should be protected
from the atmospheric conditions. If the outdoor
temperature is lower than -20°C, the air
dampers actuators must be equipped with
heating. All equipment and components
operating outside the unit must have the
required IP.
Units, periodically stopped during periods of
low outdoor temperatures, require special
attention.
They should be equipped with an automation
system that supports the flow of the liquid
through water heaters to prevent it from
freezing during AHU downtime. If it is possible
that temperature in the fan section fall below -
30°C or lower, the sections should be
equipped with an internal heating system to
ensure reliable start of the motors after
shutdown and downtime.

4.2.1.Foundation
The unit should be placed on:
a foundation slab
a steel base frame concreted into the floor
an appropriate stiff steelwork
The foundation, steel base frame or steelwork
have to be flat and leveled and they should be
able to support the weight of the unit.
Verify the floor or foundation is level. Repair, if
necessary. Make sure proper unit operation;
install the unit level (zero tolerance) in both
horizontal axes. Failure to level the unit
properly can result in improper operation of the
unit (e.g. condensate management problems,
higher vibration level, lower heating/cooling
capacity).
In AHUs situated one on another the part of the
upper AHU projecting outside the outline of the
bottom one must be supported with the use of
an appropriate construction fig. 5.
The height of the foundation slab or base frame
must allow for assembly of the siphon which
drains the condensate out of the draining tray.
In case of the drain plates installed in the lower
AHU sections, the unit has to be mounted onto
additional foundation slab or a special hollow
must be made directly under the siphon. The
minimum height of siphon is given in the
“Draining out condensate” section.
The unit sections should be connected by the
qualified personnel. Manner of the section
connection is given in the “Joining of the unit
section”
Fig.5 Sample of supporting of the upper AHUs’ sections
The section of the AHUs are equipped with frame profiles or still supports. Foundation should be
prepare in the way to provide appropriate support for each base frame profiles and supports of the
units. The short sections (till L≤ 630mm) are placed on the still supports (fig.6a). The sections longer
than 420mm have a base frame profiles (fig.6a, 6b).

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VTS reserves the right to implement changes without prior notice
Ventus Air Handling Units
Fig.6a. Supports of the short (L≤630mm) sections
Fig.6b. Base frame profiles of VVS 21-150 AHUs
*The middle profile / support exists in the units VVS 100-150
Tab.3. Relations between length of the section and length of the base frame profile
L [mm]
Lbf [mm]
650-1000
649
1040-1360
1015
1380-1600
1380
1780-1980
1746
For foundation holding of the VVS 21-150 AHUs should be drilled holes in the bottom part of the
longitudinal profile of base frame.
NOTICE! AHUs must be anchored to the foundation.
Anchoring AHUs is out of VTS delivery.

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Ventus Air Handling Units
4.2.2.Service Access
The AHU should be installed so that
connections of any related systems (ventilation
ducts, pipelines, cabling, etc.) do not collide
with the inspection panels.
CAUTION!It is forbidden to place any
elements on the AHU as well as use
the AHU as a support of ventilation
ducts and other building components.
In order to carry out the operation and
maintenance successfully, please keep
minimum recommended distance (fig.7)
between the front side and existing
construction elements (walls, pillars, pipelines,
etc.).
This is possible to install other systems,
pipelines, pillars in the operation area only if
they can be easily disassembled for the
maintenance and service procedures.
The coils are connected on the front side of the
unit
Fig.7. Free space in the front area - the VVS 21-150 AHU
4.2.3.Unit Location Recommendations
When selecting and preparing the unit
installation location, consider the following
recommendations.
Consider the unit weight. Reference the
unit weight on the unit nameplate
Allow sufficient space for the
recommended clearances, access panel
removal, and maintenance access.
All units must be installed level.
Coil piping and condensate drain
requirements must be considered.
Allow room for proper ductwork and electrical
connections. Support all piping and ductwork
independently of unit to prevent excess noise
and vibration.
4.3. Joining the AHU sections and connecting the ventilation
ducts
NOTICE! Joining the sections and connecting
AHU to the related systems as well as
maintenance and repair are carried out by
qualified specialists or they are supervised by
authorized staff.
To join the AHU sections one should in the first
stem make sure that the base section is fixed
in the right place to the foundation. Next stick
the gasket to the AHU outlet / inlet where the
next section will be connected and push the
additional section to the main base. (STEP 1
fig.8). Use screws delivered with the ahu and
screw down according to fig.8 STEP 2 and 3.

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Ventus Air Handling Units
Fig.8. Steps at the joining the AHU sections

The ventilation ducts should be connected to
the AHU with the flexible connections (optional
accessory) which suppress vibrations of the
unit and level the coaxial deflection of the duct
and the AHU outlets. Flexible connections are
equipped with flanges with sealing. The flexible
flanges should be connect with ducts with
using drilling screws or additional clamping
elements. Materials to connect ducts are not
supplied as standard delivery.
Appropriate operation of the flexible connection
occurs if it is stretched to about 110 mm.
The ducts connected to the AHU have to be
suspended or underpinned with dedicated
support elements. Conducting the ducts with
the fittings should be done in a way to
eliminate possible increase of noise level in the
ventilation system.
4.4. Connection of heaters and coolers
Connection of the exchangers should be
carried out so as not to allow for stresses
which may result in mechanical damages or
leakage. The pipeline weight and thermal
stresses cannot be passed onto the
exchanger's connections. Depending on a
local conditions please use the compensation
at the supply and return of the pipeline
system, in order to level the pipeline's linear
expansion. During assembly of the supply
system to the exchangers equipped with the
screwed connections, counter the
exchanger's connection with additional
wrench (fig.11).
The supply system should be planned so as it
does not collide with the other AHU sections.
Applied method of connecting the exchangers
with the supply system should allow for an
easy pipeline disassemble in order to remove
the exchanger from the AHU, during
maintenance and service operations.
Fig.9. Securing the screwed connections of the exchanger
Supply and return exchanger connections
should be connected so as the exchanger
operates in a counter- current way. Stream
wise operation results in lower average
temperature difference, influencing the
exchanger’s performance.

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Ventus Air Handling Units
NOTICE! Maximum operating pressure of the medium for water coils is 16 bar, tested pressure –
21 bar.
Table 4 Requirements of the quality medium for the water coils:
Parameter
Value
Oil and grease
< 1 mg/l
pH at 25°C
8 to 9
Residual water hardness
[Ca2+,Mg2+]/[HCO3- ] >0.5
Oxygen
<0.1 mg/l
(as low as possible)
Examples of connecting supply and return pipelines for various AHU versions shown in the picture.
Fig.10. Examples of feeding water exchangers
Connecting the freon cooler to the supply
system with a refrigerating unit should be done
by a qualified cooling system specialist in
accordance with the regulations concerning the
freon-driven cooling devices.
Fig. 11 Supplying freon coolers and heaters
NOTICE: The DX coils have sweat
connections. When brazing or welding
piping: avoid exposing piping components
to high heat when making sweat
connections and protect the closest valve
to the connection with a wet rag.
Supplying freon coolers
and heaters
Supplying freon coolers
and heaters

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Ventus Air Handling Units
NOTICE: Do not release refrigerant to
the atmosphere! If adding or removing
refrigerant is required, the service
technician must comply with all federal,
state, and local laws.
NOTICE: Secure the coil against frost
on the coil
NOTICE: To ensure satisfactory
operation of DX coolers the coolers
should be connected to the refrigerant
system in accordance with all relevant
regulations, rules and the best practice for
that area.
4.5. Draining out condensate
The outlet condensate connections, led outside
the AHU's casing are assembled in the drain
plates of the cooler (the diameter of drain pan
connection pipe is 32mm).
The additional section with the cooler in the
compact units in majority cases will be
connected to the base fan section on the
pressure side. There is no need to apply drain
siphons in section with overpressure, but in
order to minimize air blow-by, you can use a
siphon on the system draining out condensate,
assembling the siphon made in accordance
with fig.16a and table 8.
Siphons usable „H" height depends on the
pressure difference between the AHU section,
where condensate is drained from during
operation and the ambient pressure. „H"
dimension is provided in mm and must be
higher than the pressure difference expressed
in mmH2O.
Siphons, which are designed to drain out
condensed water from the exchangers at
different pressure of the section and
environment, should be connected to the drain
connections.
NOTICE! Due to various pressure
difference values which are present in
various AHU sections during operation it is
not allowable to connect several
condensate outlets into one siphon.
It is allowable to join together siphons of
various sections with one drain interceptor
provided that the interceptor will be equipped
with air-escape. Before starting the AHU, fill
the siphon with water. In case of cold
environment, insulate the water drain system
and eventually apply suitable heating system.
Table 5. Siphons' operational height
No.
Total fan's pressure [Pa]
Size H [mm]
1.
< 600
60
2.
600-1000
100
3.
1000-1400
140
4.
1400-1800
180
5.
1800-2200
220
6.
2200-2600
240
a) b)
Siphon while pressing Ball siphon while sucking
F ig.12. Types of siphons

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Ventus Air Handling Units
4.6. Electric connection
Connection of electric AHU elements should be
carried out by qualified personnel and should
be done in accordance with any standards and
regulations being in force in a country where
the unit is installed. Cross- section and type of
cables (e.g. shielded cable) feeding individual
functional segments should be selected basing
on nominal current and specific operation
conditions (e.g. ambient temperature, way of
cabling, distance from the power supply).
VVS 21-150 compact units are delivered as
completely wired. It means that all electrical
elements connected with the base section like
fans, rotor, actuator installed inside the section
are connected to the power and control
system. User should only lead the power to
the AHU and connect separate control
elements like actuators, sensors, etc.
Before starting connecting power supply, check
conformity of the voltage and frequency of a
supply network with the data shown on the
device's rating plate. Permissible fluctuation of
the supply voltage and its frequency to the
values shown on the rating plate is ±5%. If
discrepancy exists, the device cannot be
connected.
Details about waring and connections is given
in “Automation” section.
4.7. AHU components
4.7.1.Hydronic coil exchangers
Fig. 13 Dimensions of hydronic coil exchangers