VTS Medical Systems Ventus Compact VVSc Series Troubleshooting guide

VTS Technology Department
Rev: 2020-04-30
PLUG &PLAY AHU QUICK START-UP GUIDE
VVSc Floor-mounted Compact Units
VVSs Ceiling-suspended Compact Units

VTS Technology Department
Rev: 2020-04-30
Table of Contents
General safety rules............................................................................................................................................. 2
About this quick step manual.............................................................................................................................. 3
Range of covered information........................................................................................................................3
4 steps to run your Air Handling Unit.............................................................................................................3
Stage 1 –unboxing of the control elements............................................................................................. 3
Stage 2 –connecting of all peripheral control elements to the Base Unit and power supply........... 3
Stage 3 –connecting of the Air Handling Unit to mains.........................................................................3
Stage 4 –Start-up of the Air Handling Unit..............................................................................................4
Reference manuals..............................................................................................................................................4
Minimum required tools range............................................................................................................................4
Location of the key elements on the unit..........................................................................................................4
VVSc Floor-mounted Compact Units............................................................................................................4
VVSs Ceiling-Suspended Compact Units.....................................................................................................5
Plug & Play control elements.............................................................................................................................. 6
Verifying of the AHU package content.......................................................................................................... 6
Air treatment functions control elements..................................................................................................6
Auxiliary control elements...........................................................................................................................6
Connecting of the peripheral control elements to the base unit.................................................................... 7
Supply duct temperature sensor....................................................................................................................7
Fire alarm signal...............................................................................................................................................7
Air damper actuator..........................................................................................................................................8
Anti-freeze thermostat for water heater on the air side.............................................................................. 8
Strap-on temperature sensor on heating water return ...............................................................................9
Water pump group for water heater...............................................................................................................9
3-way valve actuator....................................................................................................................................9
Heating water circulation pump................................................................................................................10
Electric heater................................................................................................................................................. 10
Power supply cable....................................................................................................................................10
Crossing and connecting the power supply and control cables..........................................................11
3-way valve for water cooler......................................................................................................................... 12
Connecting of User interfaces......................................................................................................................12
HMI Advanced ............................................................................................................................................13
HMI Basic....................................................................................................................................................13
Connecting of the auxiliary devices.................................................................................................................14
Chilling source failure alarm.........................................................................................................................14
DX Compressor communication fir air cooling function only...................................................................14
DX compressor analog control signal for cooling mode only.............................................................. 14
DX compressor failure alarm........................................................................................................................14
On-Off DX compressor start permission signal –cooling mode only.................................................15
DX Compressor communication supporting heating and cooling (Reversible operation)...................15
DX compressor analog control signal for cooling and heating mode................................................. 15
On-Off DX compressor start permission signal –cooling and heating mode...................................16
Heating / Cooling mode information for DX compressor...................................................................... 16
Connecting the Air Handling Units to mains...................................................................................................17
VVS021c –VVS150c –Floor-mounted Compact Air Handling Unit ......................................................17
Power supply cables..................................................................................................................................17

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Connection to mains..................................................................................................................................17
VVS0005cs –VVS030s –Ceiling Suspended Compact Air Handling Unit...........................................18
Power supply cables..................................................................................................................................18
Connection to mains..................................................................................................................................18
Air Handling Unit start-up..................................................................................................................................19
Switching on the Air Handling Unit..............................................................................................................19
Start-up by means of the HMI Basic............................................................................................................19
Look of the HMI Basic and function buttons...........................................................................................19
Turning the Air Handling Unit into On mode.......................................................................................... 19
Running the AHU........................................................................................................................................20
Change to air temperature set-point............................................................................................................20
Start-up by means of the HMI Advanced....................................................................................................20
Look of the HMI Advanced and function buttons...................................................................................20
Toggling between operational modes..................................................................................................... 21
Air temperature assigning for basic operational modes....................................................................... 21
Appendix A: List of illustrations........................................................................................................................ 23

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GENERAL SAFETY RULES
Before attempting to any works described in this Quick Set-Up Manual and other related documents please acknowledge
below listed General Safety Rules:
All installation, configuration and start-up work described in the following chapter of this manual and the related ones must
be done by authorized personnel and with respect to code of the state in which the installation of the unit is done.
The VTS company shall not assume any liability for personal injuries or damage to property in case of disobey the
regulations and safety requirements. Also, the company will not assume any damage resulting from product modification
without manufacturer’s authorization.
To reduce a potential risk during maintenance or installation works appropriate safety clothes shall be worn.
Electrical power to power mains must be connected via appropriate rating circuit-breaker.
In the event of detected malfunction, contact authorized service of VTS. Do not attempt any repairs yourself.

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ABOUT THIS QUICK STEP MANUAL
RANGE OF COVERED INFORMATION
This document is a quick installation, configuration and start-up manual for the following range of VTS Products
(Figure 1):
VVSc Floor-mounted Compact Units
VVSs Ceiling-suspended Compact
Figure 1 - VVSc and VVSs range of Air Handling Units
It is aimed to guide the user through all necessary steps, systematize the sequence of taken actions to prevent from any
damage to the equipment while setting-up the AHU.
It needs to be emphasized, that this document IS NOT a complete Operation and Maintenance Documentation of the VTS
products and does not cover all advanced details of the products and their control application. Such information is available
in all remaining technical and maintenance manuals listed in chapter “Reference manuals”.
4STEPS TO RUN YOUR AIR HANDLING UNIT
In general, the preparation of the Air Handling Unit for start-up consists of the following 4 stages:
STAGE 1–UNBOXING OF THE CONTROL ELEMENTS
Details in chapters:
Plug & Play control
elements
STAGE 2–CONNECTING OF ALL PERIPHERAL CONTROL ELEMENTS TO THE BASE UNIT AND POWER SUPPLY
STAGE 3–CONNECTING OF THE AIR HANDLING UNIT TO MAINS
Details in chapters:
On-Off DX compressor start
permission signal –cooling and
heating mode
Details in chapters:
Connecting of the peripheral
control elements to the base unit

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STAGE 4–START-UP OF THE AIR HANDLING UNIT
Details in chapters:
Air Handling Unit start-up
REFERENCE MANUALS
In the following chapters of this Quick Set-Up Manual, multiple references to detailed manuals of VVSc and VVSs ranges
will occur. The full list of the reference manual has been listed below with the links:
Installation, Operation and Maintenance Manual VENTUS COMPACT VVS021c-VVS150c [EN] –a full, detailed Operation
and Maintenance Manual for VVSc Floor-mounted Compact Air Handling Units. This manual covers all information related
with installation, set-up and start-up of the VVSc units.
Installation, Operation and Maintenance Manual VENTUS Supended VVS005s-VVS030s [EN] –a full, detailed Operation
and Maintenance Manual for VVSs Ceiling Suspended Compace Air Handling Units. This manual covers all information
related with installation, set-up and start-up of the VVSs units.
VENTUS_Compact_connecting_instruction.pdf –Graphical Manual describing how to connect all of your peripheral control
components to the main unit’s switchboard –an release for fast printing.
Installation, Operation and Maintenance Manual - VENTUS Software - uPC3 controller and BMS data [EN] –detailed
information all advanced functions of the uPC controller applied in your Air Handling Units
User Manual - Visualization guide for uPC3 controller [EN] –document covering remote AHU operations visualization by
means of web-browser or mobile devices.
MINIMUM REQUIRED TOOLS RANGE
Before attempting to any electric connections described in detail in the following chapters of this manual, ensure that you
are equipped with the following minimum range of tools:
Table 1 - minimum necessary tools
Tool name
Tool application
Picture
Set of flat head screwdrivers
Plugging the control elements terminals
into the switchboard
Set of cross screwdrivers
Connecting of the power supply to
relevant parts of the Air Handling Units
Battery drill & set of various bits
Opening and closing of AHU sections
and switchboard
LOCATION OF THE KEY ELEMENTS ON THE UNIT
VVSC FLOOR-MOUNTED COMPACT UNITS
The VVSc Floor-mounted AHU may be factory-fitted for indoor or outdoor application (depending on the order).
Depending on the execution, location of the terminal-box may vary, as per below:
VVSc AHU fitted for indoor installation –terminal box installed on the base unit’s ceiling.
VVSc AHU fitted for outdoor installation –terminal box installed on the base unit’s rear wall.
Location of the terminal boxes for VVSc units has been demonstrated on Figure 2.

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VVSc unit factory fitted for Indoor installation
VVSc unit factory fitted for Outdoor installation
Figure 2 - VVSc - location of the terminal box
VVSS CEILING-SUSPENDED COMPACT UNITS
The VVSs Floor-mounted AHU may be factory-fitted indoor application only. Depending on the execution, location of the
terminal-box may vary, as per below (Figure 3):
VVSs unit –controller installed inside the AHU body
VVSs unit –controller integrated with terminal-box
Figure 3 - VVSs - location of the terminal box

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Depending on the AHU execution (due to constant product improvement), terminal box of the VVSs Ceiling Suspended
Compact Unit may occur in one of below modes:
Terminal box includes main switch, mains and controls terminals only. Main AHU controller installed inside the unit’s body
(Figure 3, left).
Terminal box includes main switch, mains and controls terminals, main AHU controller, pressure transducers board, main
circuits breakers and control circuits power supply. All integrated on one common board (Figure 3, right).
PLUG & PLAY CONTROL ELEMENTS
VERIFYING OF THE AHU PACKAGE CONTENT
Unbox all control elements included in the AHU package. Keep them in order to easily verify their completeness. Refer
to the Technical Specification Card (being a part of the package) to verify the AHU type and configuration. Use Figure 4 and
Figure 5 to verify if the attached controls elements are included in your set.
AIR TREATMENT FUNCTIONS CONTROL ELEMENTS
Below listed control elements are supposed to be obligatory part of your AHU set, depending on the range of air
treatment functions supported.
Technical Specification first page (example)
AHU Type
Air treatment function
Required control
element
VVSc
Hot Water
Coil
3-way valve or
Water Pump Group
(WPG)
Chilled
Water Coil
3-way valve
DX Cooling
Coil
N/A
VVSs
Hot Water
Coil
3-way valve or
Water Pump
Group (WPG)
Electric
Heater
Differential
Pressure Switch
Chilled
Water Coil
3-way valve
DX Cooling
Coil
N/A
Figure 4 - Required control elements for key air treatment functions
AUXILIARY CONTROL ELEMENTS
Beyond the control element directly related with relevant air treatment function, the AHU package may include the
following optional parts:
Picture
Auxiliary control element name
Application
HMI Advanced
(Human-Machine Interface)
Advanced user interface enabling access to all control
application settings of the AHU
HMI Basic
(Human-Machine Interface)
Basic user interface enabling easy regulation of the
main AHU operational parameters

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Strap-on return water temperature
sensor (for water heater)
Optional monitoring of returning heating water
temperature, as an alternative to default heater
protection realized by means of anti-freeze thermostat
CO2concentration transducer
Optional monitoring of CO2concentration in return air
supporting air mixing (VVSc base with mixing box)
Relative Humidity Limiting
Transducer
Optional monitoring of air relative humidity in the
supply duct to prevent against excessive humidity
content in supply air.
Figure 5 - Auxiliary Control Elements
CONNECTING OF THE PERIPHERAL CONTROL ELEMENTS TO THE BASE UNIT
Caution
Before attempting to connect the peripheral control element to the base unit, ensure that
the Base Unit is disconnected from power supply mains.
Connect all peripheral control element to the terminal block on the Base Unit. Carefully read the marks attached to the
cables tips and find relevant markings printed on the terminal block below each single terminal. Plug relevant cables to the
identically marked ports on the terminal block. The following chapters will guide you to make correct connections.
SUPPLY DUCT TEMPERATURE SENSOR
The Supply duct temperature sensor must be installed
downstream any air treatment functions handled by your unit.
Below diagram illustrates supply ducted temperature sensor
installed together with VVSs suspended unit. The same rule
concerns the floor mounted model of VVSc range.
Figure 7 - Connection of the ducted temperature sensor. T1 port
FIRE ALARM SIGNAL
The fire alarm signal (signal normally closed) can be connected to the AHU switchboard if issued by the building systems.
In case the AHU is not intended to be communicated with the fire protection system of the building, the Fire Alarm input on
the switchboard should be permanently bridged. See Figure 8.
Figure 6 - Supply air temperature ducted sensor correct installation

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Figure 8 - Fire alarm signal connections / permanent bridge. Ports: Fire al.
AIR DAMPER ACTUATOR
VVSc or VVSs supply-exhaust air handling units are equipped with two air dampers –one for supply, the other one for
exhaust air tier. Both of the dampers are power supplied and controlled from the same location on the terminal block. The
damper actuators will be connected to the Ports: Dampers G, Dampers G0, D02 of the switchboard. Mind, that both of the
actuators will be connected in parallel, using the 3-way lever connector (attached together with the actuators), as shown on
Figure 9 (3-way lever connector shown in low-left corner of).
Figure 9 - Connection of the Air Damper Actuator to the switchboard; Ports: Dampers G, Dampers G0, D02
ANTI-FREEZE THERMOSTAT FOR WATER HEATER ON THE AIR SIDE
The anti-freeze thermostat on the air side monitors air temperature directly downstream the heating coil and triggers the
AHU defrosting mode if necessary. Its terminals must should be connected to the “Heater al.”port, terminals G0, DI2, as
shown on the Figure 10.

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Figure 10 - Connection of the antifreeze thermostat on the air side; Port: Heater al. G0, DI2
STRAP-ON TEMPERATURE SENSOR ON HEATING WATER RETURN
Strap-on temperature sensor (Figure 11) is an optional equipment of the water heater. While installing the strap-on
temperature sensor, mind, that the sensor must be stuck to the return water pipe from your water heater. Proper installation
is critical for the return water temperature monitoring and coil antifreeze protection of the coil. DO NOT CONFUSE IT.
Figure 11 - installation and connection of the return water strap-on temperature sensor; T .heater port
WATER PUMP GROUP FOR WATER HEATER
NOTE! Put a special attention to the way the water pump group is connected to the water heater. In order to enable
proper regulation of the coil capacity (“Quality Regulation”). Refer to OMM VENTUS Compact floor RRG units with controls
EN or OMM VENTUS Compact suspended units with automatic EN.
The water pump is an integrated peripheral system supporting proper operations of the water heater. While connecting
it to your switchboard, mind, that 2 of below listed electric circuits must be put in to make the connection complete:
3-WAY VALVE ACTUATOR
The 3-way valve actuator (part of the water pump group) is the main regulator of the water heater capacity. Connect it
to the switchboard as shown on the Figure 12 (port “Heating”, terminals: G0, G, Y1).

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Figure 12 - Connection of the 3-way valve (part of the pump group) supply and control signal; Heating port
HEATING WATER CIRCULATION PUMP
The heating water circulation pump (part of the water pump group) supports the 3-way valve in capacity regulation.
It needs to be supplied with power. This very circuit needs to be connected to the power terminal, as shown on the Figure
13 (terminals L, N, PE).
Figure 13 - Connection of the water heater recirculation pump to the power supply source
ELECTRIC HEATER
POWER SUPPLY CABLE
Before attempting to connect the electric heater, make sure that you have a proper power cable (not supplied by VTS).
The type of the electric heater supply cable is Color-coded PVC power and control cable. See Table 2 for minimum
cross-sections depending on the heater rater capacity and rated current.

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Table 2 - power supply cables for electric heaters
Heater Capacity
Rated current
Cable cross-section
3 kW
4,3 Amp
4 x 1,5 mm²
6 kW
8,7 Amp
4 x 1,5 mm²
9 kW
13,0 Amp
4 x 1,5 mm²
12 kW
17,3 Amp
4 x 2,5 mm²
15 kW
21,7 Amp
4 x 2,5 mm²
18 kW
26,0 Amp
4 x 4,0 mm²
21 kW
30,3 Amp
4 x 4,0 mm²
24 kW
34,7 Amp
4 x 6,0 mm²
27 kW
39,0 Amp
4 x 6,0 mm²
30 kW
43,4 Amp
4 x 10,0 mm²
33 kW
47,7 Amp
4 x 10,0 mm²
36 kW
52,0 Amp
4 x 10,0 mm²
CROSSING AND CONNECTING THE POWER SUPPLY AND CONTROL CABLES
Make all connections (power and control) of the electric heater as shown on Figure 14
NOTE! Mind swapped sequence of the terminals: 2; 1; 3.
Figure 14 - Electric heater connections
Explanation to above:
Pressure switch cable –will be connected to the T1 and L terminals of the electric heater (Figure 14).
Power supply cable (3x400 VAC) –will be crossed through the power gland (the large one) and connected to the L1, L2
and L3 power terminals located of the F1 power mains switch (Figure 14).
Auxiliary power supply cable (1x230 VAC will be crossed through the power gland (the large one) and connected to the L
and N terminals (Figure 14).

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Control signal cable –will be crossed by the control gland (the small one) and connected to the X1 terminal block (Figure
14).
NOTE! For unit with electric heater, the terminals of the water heater antifreeze thermostat must be permanently bridged,
like shown on Figure 15.
Figure 15 - Permanent bridge on Heater al. terminals (G0, DI2)
3-WAY VALVE FOR WATER COOLER
For the unit equipped with water cooling coil (water cooler), connect its 3-way valve set (valve with actuator) as shown
on Figure 16.
Figure 16 - Connection of the water cooler 3-way valve. Port Cooling
CONNECTING OF USER INTERFACES
Beyond above listed connection of the peripheral control components, two types of user interfaces can be connected to
the relevant ports on the AHU switchbox

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HMI ADVANCED
HIM Advanced –an advanced user interface,
enabling all range of AHU regulations and settings.
Connect this interface using original cable
terminated with RJ45 plug, as shown on Figure 17.
HMI BASIC
The HMI Basic interface enables basic range of AHU regulations and settings. Due to fact, that it is equipped with built-
in room temperature sensor, it should be installed on the wall of air-handled room (Figure 18). For details, refer to the
installation manual boxed together with the HMI Basic
Figure 18 - Installation of the HMI Basic interface
When installed, cross the communication cable to the Air Handling Unit switchboard and connect as shown on
Figure 19.
Figure 19 - Connection of HMI Basic
Figure 17 - HMI Advanced port

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CONNECTING OF THE AUXILIARY DEVICES
CHILLING SOURCE FAILURE ALARM
For the unit equipped with cooler (both water or DX) you can connect a binary signal informing about general failure of
the cooling medium source (chiller or DX compressor). If such alarm is triggered, the control application of the Air Handling
Unit disengages the cooling mode (unit will remain running, with no cooling function). Follow the Figure 20 to link the cooling
medium source with the AHU controls. Communication cable is not supplied.
Figure 20 - Cooling medium source failure status binary signal
DX COMPRESSOR COMMUNICATION FIR AIR COOLING FUNCTION ONLY
For the DX coil supplied from DX compressor supporting summer operation (cooling function) only, follow below steps.
DX COMPRESSOR ANALOG CONTROL SIGNAL FOR COOLING MODE ONLY
For DX compressor enabling smooth capacity control for cooling mode only, a 0-10V communication between AHU
and compressor can be established. Connect the analog input of your DX compressor (0-10V standard) to the Cooling
port, terminals G0, Y3 (Figure 21). Communication cable is not supplied.
Figure 21 - 0-10 V analog signal output for DX compressor –cooling mode only
DX COMPRESSOR FAILURE ALARM
For the AHU with DX coil, a signal informing the AHU about the compressor failure can be input. If such alarm is triggered,
the AHU disengages the cooling function (depending on the mode). However, the AHU will keep running. Follow the Figure
22 to link the cooling medium source with the AHU controls. Communication cable is not supplied.

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Figure 22 - DX compressor failure status binary signal
ON-OFF DX COMPRESSOR START PERMISSION SIGNAL –COOLING MODE ONLY
For older types of DX compressors non-supporting capacity smooth regulation, a start permission signals can be output
like shown on Figure 23. The system can output two signals:
Signal Cooling 1 –for cooling capacity requirement between 0-50%
Signal Cooling 2 –for cooling capacity requirement between 50-100%
Check, if your DX compressor has 2 inputs for above listed signals. If your compressor has only one binary star permission
signal input, make only connection on Cooling 1 (G0, D03 terminals).
Figure 23 - 2 stages start permission binary signals output for DX compressor
Depending on number of binary outputs in use, a relevant setting must be done in the AHU controller settings. Refer to
Installation, Operation and Maintenance Manual VENTUS COMPACT VVS021c-VVS150c [EN] or Installation, Operation
and Maintenance Manual VENTUS Supended VVS005s-VVS030s [EN] (depending on Air Handling Unit type).
Communication cable is not supplied.
DX COMPRESSOR COMMUNICATION SUPPORTING HEATING AND COOLING (REVERSIBLE OPERATION)
For the DX coil supplied from DX compressor supporting both seasons operations (cooling and heating), follow below
steps.
DX COMPRESSOR ANALOG CONTROL SIGNAL FOR COOLING AND HEATING MODE
For DX compressor enabling smooth capacity control for cooling and heating (reversible operation) mode, a 0-10V
signal from the Air Handling Unit can be output and plugged to it. Connect the analog input of your DX compressor (0-10V
standard) to the Cooling port (for the reversible operations, the Cooling port supports both modes), terminals G0, Y3.
Communication cable is not supplied. See Figure 24.

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Figure 24 - 0-10 V analog signal output for DX compressor - cooling and heating mode
ON-OFF DX COMPRESSOR START PERMISSION SIGNAL –COOLING AND HEATING MODE
For older types of DX compressors non-supporting capacity smooth regulation, a start permission signals can be output
like shown on Figure 25. The system can output two signals:
Signal 1 –for cooling or heating capacity requirement between 0-50%
Signal 2 –for cooling or heating capacity requirement between 50-100%
Communication cables are not supplied.
Figure 25 - Binary control signals for cooling and heating mode
HEATING /COOLING MODE INFORMATION FOR DX COMPRESSOR
For DX compressor supporting both seasons operations (cooling and heating), auxiliary signal from the AHU can be
output informing the compressor about currently engaged mode. Plug your signal cable to the Cool 2 port (G0, D04
terminals) as shown on Figure 26. Communication cable is not supplied.

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Figure 26 - Heating/Cooling mode information binary signal output
CONNECTING THE AIR HANDLING UNITS TO MAINS
Caution
Before attempting to connect the Air Handling Unit to the mains, ensure that all peripheral devices are connected, and the
main power switch is in OFF position.
VVS021C –VVS150C –FLOOR-MOUNTED COMPACT AIR HANDLING UNIT
POWER SUPPLY CABLES
The power supply cables are not supplied by VTS. Before attempting to the connecting the unit to the mains, ensure that
you are supplied with correct type of cable and minimum length of it. Apply relevant cable type and cross-section to our unit
size as listed in Table 3.
Table 3 - Power supply cables for VVSc Floor-mounted Compact Air Handling Units
VVSc unit size
Power supply standard
Cross-section
VVS021c
3x400 V AC
4 x 2,5 mm²
VVS030c
4 x 2,5 mm²
VVS0400c
4 x 2,5 mm²
VVS055c
4 x 4,0 mm²
VVS075c
4 x 4,0 mm²
VVS100c
4 x 6,0 mm²
VVS120c
4 x 6,0 mm²
VVS150c
4 x 10,0 mm²
CONNECTION TO MAINS
Connect your air handling unit to the mains (Figure 27). For the VVSc range, the power supply standard is 3x400V AC.

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Figure 27 - VVSc Floor mounted Compact Air Handling Unit - connection to mains, 3x400V AC
VVS0005CS –VVS030S –CEILING SUSPENDED COMPACT AIR HANDLING UNIT
POWER SUPPLY CABLES
The power supply cables are not provided by VTS. Before attempting to the connecting the unit to the mains, ensure
that you are supplied with correct type of cable and minimum length of it. Apply relevant cable type and cross-section to
our unit size as listed in Table 4.
Table 4 - Power supply cables for VVSs Ceiling Suspended Compact Air Handling Units
VVSc unit size
Power supply standard
Power cable cross-section
VVS005s
1x230 V AC
3 x 2,5 mm²
VVS010s
3 x 2,5 mm²
VVS015s
3 x 2,5 mm²
VVS020s
3 x 4,0 mm²
VVS030s
3 x 4,0 mm²
CONNECTION TO MAINS
Connect your air handling unit to the mains (Figure 28). For the VVSs range, the power supply standard is 1x230V AC.
Figure 28 - VVSs Ceiling Suspended Compact Air Handling Unit - connection to mains, 1x230V AC