Remak VCS User manual
INSTALLATION AND OPERATING INSTRUCTIONS
Control units
05/2023
2
Table of Contents
ne VCS control unit soware is the intellectual property
of REMAK a.s.
nVCS control units are manufactured in accordance with
valid Czech and European regulations and technical stan-
dards.
nVCS control units must be installed and used only in accor-
dance with this documentation. Without the manufactu-
rer's consent, do not install any additional components or
make modifications to the wiring.
nThe manufacturer is not responsible for any damage re-
sulting from use for purposes other than specified in this
documentation, and the customer bears the risks of such
use, or the person responsible for causing non-compliance
with the documentation
nThe installation and operating documentation must be
available for the operating and servicing staff. It is advi-
sable to store this documentation close to the installed
VCS control unit.
nBefore installing and using the air-handling units, it is nece-
ssary to familiarize yourself with and observe the directions
and recommendations included in the following chapters.
Introduction
nThe VCS control units, including their individual parts,
are not intended, due to their concept, for direct sale
to end customers. Each installation must be performed
in accordance with a professional project created by a
qualified designer who is responsible for the application
of the equipment, proper selection and dimensioning
of components concerning their suitability for a given
application.
nInstallation, wiring, commissioning, maintenance, and
repairs may only be carried out by a professional company
or a qualified employee with the necessary credentials
according to the applicable regulations.
nREMAK a.s. is not responsible for any damage, direct or
indirect, caused by unauthorized or unqualified used of
the soware or hardware, or for any damage caused by
ignoring the product's Operating Instructions.
Up-to-date version of this document is available at website www.remak.eu
Equipment characteristics, Box design.........................................................................................................................................3
Control......................................................................................................................................................................................................4
Connection to master system (BMS/BACS)...............................................................................................................................4
Poer part, Design..................................................................................................................................................................................5
Documentation and Safety Measures...........................................................................................................................................6
Location and installation....................................................................................................................................................................7
Commissioning......................................................................................................................................................................................8
Frequency inverter connection ........................................................................................................................................................9
Control and Protection Functions................................................................................................................................................10
Basic Operating Modes...................................................................................................................................................................19
Additional Operating Modes and Functions .............................................................................................................................19
Temperature and Time Modes......................................................................................................................................................20
HMI-SG ..................................................................................................................................................................................................22
List of Data Points HMI-SG ............................................................................................................................................................29
List of Failures HMI-SG .....................................................................................................................................................................45
REMAK mobile app ...........................................................................................................................................................................48
HMI-DM, HMI-TM)..............................................................................................................................................................................49
HMI@Web............................................................................................................................................................................................52
AHU unit operation visualisation..................................................................................................................................................58
Other Control – external control ..................................................................................................................................................59
Pool units – descriptioon of contro.............................................................................................................................................60
Unit Activation ....................................................................................................................................................................................64
Checks and Failures...........................................................................................................................................................................64
Troubleshooting .................................................................................................................................................................................65
Spare Parts and Service..................................................................................................................................................................66
Disposal and Recycling....................................................................................................................................................................66
3
Control units VCS
Equipment characteristics, Unit Design
Application
VCS control units are complex control and power electrical
systems used for the decentralized regulation and control of
air-handling systems. ey provide the equipment with high
stability and safety while allowing easy control, including the
viewing of operating states. (STOP - OPERATION - AUTO).
Main Features
e VCS control unit is intended for the following:
nComplex autonomous control of air-handling systems
ntemperature and humidity control in the supply or space
(cascade control)
nSupply and power actuation of air-handling systems
nProtection and safeguarding of connected components
is control unit provides air-handling systems with control
and safety functions. It can be equipped with the necessary
number of proportional inputs and outputs depending on the
required functions.
Sophisticated control algorithms ensure system stabil-
ity, user-friendly control and energy savings. Another
advantage is that the control unit's features also contrib-
ute to energy savings in air-handling system operation:
ne unit can be set to 2 temperature settings, or even
humidity modes:
• Comfort
• Economy
nTime schedule setting options
(daily or weekly time schedules)
nAdditional operating mode setting options:
• Optimized start
• Temperature start-up
• Night chilling
nPrecise drive control using data communications
(Modbus RTU protocol)
nSuperior antifreeze protection with moderate heating of
the heat exchanger during standby mode
nPrecise analogue control of controlled peripheral units
(according to the controlled component)
Unit Design, Boxes
General information
ese control units are designed in accordance with ČSN
EN 60204-1. e unit's control and power parts are situ-
ated in a single box. e components, control and actuating
elements, are fitted on the DIN bars inside the control unit.
Depending on the version, the VCS control unit can be provided
in plastic (plastic switchboard) or in sheet-steel (sheet-steel
switchboard). Both designs are equipped with transparent
doors. e controls are situated below these doors. Further,
the VCS control unit can be produced as a built-in assembly
and a part of an air-handling unit section, which must be
designed for that purpose and meet specific requirements.
ne VCS outdoor units, or their individual parts, are always
supplied with the boxes in painted steel sheet with full doors.
e indoor units come in either painted steel or plastic (not
for SKFM) boxes - both with transparent doors.
Figure 1 – VCS control unit (plastic box design)
Control unit box
Screws
Circuit breakers
Disconnecter
Master switch
nere are no controls mounted on the doors or on the
outside of the cabinets, the main switch is under the door
and the controllers (HMI) are on wired connections or on the
LAN (WLAN).
nIn addition to the variants of separate (switchboard) en-
closures outside the air handling unit, the control units can be
built directly into the air handling unit (XPRJ section (control
and power section excluding FM) and XPFM (separate FM
installation), integrated control cabinet in the CAKE compact
unit).
Figure 2 –installation inside air handling unit
a) AeroMaster XP b) CAKE
ne individual instruments, control, operating, safety, etc.
elements inside the control unit are mainly mounted on DIN
rails on the supporting structures. In specific cases, they can be
mounted on the base plate (especially frequency converters).
nFor plastic enclosures, the door opening side (le/right)
can be user-adjustable. In the case of steel sheet, the side
design is fixed.
ne degree of protection (against contact with live parts,
ingress of foreign bodies and water) for the plastic enclosure
corresponds to IP65 when the door is closed and IP40 when
the door is open. For a sheet metal enclosure, the protection
is IP55 or IP66 (depending on the enclosure type) when the
door is closed and IP20 when the door is open. e sheet
metal enclosure with additional ventilation is IP54 when the
door is closed and IP20 when the door is open. e VCS in
the integrated version as a built-in and part of the air handling
unit is IP44 (with the door closed).
4
Figure 4 – options for remote control (via LAN)
Other controls (technological)
For basic control (triggering, mode switching)
from a technology or a very simple manual button / switch
control, you can use "Other Controls". External control via one
or two non-voltage contacts.
Control from master system
When integrating HVAC with the VCS control unit into complex
building management systems (BMS), it is also possible to
connect to these systems.
Subsequently, it is possible to control and monitor the HVAC
through them. e ModBus, LON, and BacNet standards
can be used.
e different types of control must be designed when design-
ing (configuring) VCS into the project and especially in produc-
tion - the usability of remote control and connectivity to the
BMS are dependent on the use of the corresponding controller.
Detailed descriptions of all controller types, control and their
use - see separate sections / chapters of this manual.
Control, Connection to the Master System
Control
Local control
e basic VCS controllers are devices (manual controllers
with bus connection) for so-called local control of the control
unit (see fig. 2):
a) Room controller - HMI-SG (POL822/60)
b) Comfortable universal alphanumeric driver
- HMI-DM nebo HMI-TM
Note: For details, see controllers instructions part of the
manual.
Note: For some unit configurations, HMI-SG is not satisfactory
and HMI-TM/DM is required (e.g. pool units, others according
to information in design SW for VCS configuration).
HMI-TM
HMI-SG
HMI-DM
Controller HW and SW Concept
e core of the VCS system is created by a powerful Siemens
Climatix series PLC controller. e control unit can be equipped
with one of two POL4xx and POL6xx controller versions
depending on the components used in the air-handling unit.
Simultaneously, additional external input/output or commu-
nication modules can be connected to the POL6xx controller.
For local control, the HMI-SG POL822/60 hand controller
can be used. e control unit allows up to 8 basic control
sequences to be used depending on the air-handling unit
configuration. e order of some sequences can be changed
(e.g. heating-mixing damper or cooling-fan cooling).
e heat pump or electric aer-heater can be separated from
basic sequences in the so-called extra sequences.
If this is the case, another sensor must be used in the air inlet,
and a special set-point must be set for this type of control.
is feature can only be used aer prior consultation with the
manufacturer. ese units are delivered adapted to individual
applications so they will provide exactly those features needed
for the operation of a specific air-handling device.
Figure 3 –local HMI controllers
Distant control
In addition to local VCS controllers, so-called remote control
can be used (Fig. 4). For this control, you need to connect
VCS to LAN, WAN or Internet (For production, the control unit
must be configured/ordered with the required functionality).
a) HMI@WEB - Using the web interface, it is possible to
utilize HMI@WEB control. e control functionality fully cor-
responds to the local HMI-DM and TM controllers. For more
details, see page 41.
b) Mobile app (see fig. 3, more details on page 47) - You can
use simple touch application for smartphones or tablets with
Google Android (v. 4.1 and higher) or Apple iOS (v. 12.2 and
higher), or application for PC with Windows 64bit.
c) AHU unit operation visualization
Monitoring and operation using the device’s technological
scheme with operating parameters, respectively using the
tabular interface of an internet browser on a PC. For details,
refer to page 58.
Connection to master system
(BMS/BACS)
e VCS control unit can be optionally integrated into Build-
ing Management Systems (BMS) or Building Automation
Control Systems (BACS) through various networking options,
including LAN (Ethernet) and serial industrial communication
buses (RS485, or LonWorks) with the following protocols:
nModbus (TCP/IP nebo RTU)
nBACnet IP
nLonTalk
Subsequently, it is possible to monitor and control the air
handling unit through the integrated connection with the
Building Management System (BMS). is connectivity option
needs to be configured in the AHU+MaR design soware. e
usability of remote control and compatibility with BMS depend
on the use of an appropriate controller.
5
Control units VCS
Figure 5 –VCS control unit internal structure
Power Part
e power part, like the control part, is always "tailored" for
a specific air-handling unit. e main switch (located at the
bottom) with clearly marked positions (On/Off) serves as
the primary connection element for supplying power to the
control unit. It allows for locking the device in the off position
to ensure safety during work on the equipment.
e control units themselves are not equipped with surge
protection. It is necessary to address surge protection as part
of the overall electrical installation project for the building,
typically in the superior distribution panel.
Connecting terminals
Connecting terminals
Controller
Siemens Climatix
Power Part , Design
Table 2 – List of connecting cables (example)
Cable No. (Recommended) cable type Power Supply Cable length
Figure 7 – Component wiring (example)
Figure 6 – Summary of connected components (example)
Metal boxes can also be equipped with a ventilation kit - a fan and a louver in opposite
corners of the box, as well as heating with thermostat control.
Design
e design of the M&C system, specifically the configuration
of the control unit and its box, is carried out in the REMAK
design soware.
VCS
ACX36/RMK
Version Height Width Depth
Plastic 610 448 160
Plastic 842 448 160
Sheet-steel 800 550 250
Sheet-steel 1200 750 300
Sheet-steel 1600 750 300
Table 1 – e dimensions of the main VCS boxes
in millimeters (w/o any pedestals or stands)
is process is based on the configuration of the air handling
unit and the project-specific user requirements for its proper-
ties and functions. e REMAK soware allows for the cus-
tomization and adaptation of the control unit and its cabinet
based on the desired specifications and functionality outlined
in the project requirements.
M&C accompanying documentation is generated, providing a
comprehensive specification of the control unit, including the
dimensions of the proposed individual boxes (commonly used
boxes are listed in Table 1), wiring diagrams, and production
materials. is documentation includes a clear identification
of the order and the air handling unit, ensuring unambiguous
traceability:
nConfiguration (functions and design) of the control unit,
providing an overview of the connected components of the
air handling unit and individual M&C elements.
nElectrical wiring diagram of all M&C components with the
control unit.
nList of recommended cables (exact cable usage should
always be done according to the electrical project documen-
tation).
nOptionally, ID codes for mobile application integration.
Detailed information regarding communication and integra-
tion into the building management system (data variables/
registers, etc.) can be found in a separate manual available
on the VCS product webpage at www.remak.eu.
6
Documentation, Safety Measures, Manipulation
Design
e control system design is based on the selection of required
features and on its internal configuration. e design is performed
automatically using the algorithm integrated into the design so-
ware also used for the air-handling unit design. e design output
provides an exact specification of the control unit, including the
following individualised lists for a specific device:
nSummary of connected components
nWiring diagrams of all components
nList of all recommended cables for the connection of all
components (the cables must always be used in accordance
with the el. equipment project documentation).
Control Unit Designation
e control unit designation is always created by a unique code
(generated by the AeroCAD design program for the control unit
calculation and design), which is only included in the accompany-
ing technical documentation (not on the control unit), and by
the serial number (for communication with the manufacturer).
Documentation
VCS control systems can be installed and used only in accordance
with the delivered documentation.
Documentation List
nProduct Installation and Operating Instructions
nControl system configuration (summary of connected
components), terminal diagram and list of recommended
cables – device printout from the design program
Additional – General Documentation
e system or device documentation also includes the operating
and inspection documentation kept during the device service life
and the Service Regulations, for which the user is responsible.
Service Regulations
Before putting the air-handling device into permanent operation,
the device user in collaboration with the designer, or the sup-
plier, must issue service regulations in accordance with local
regulations.
We recommend including the following in these service regula-
tions:
nAir-handling device assembly configuration, its intended use
and a description of its operation in all operating modes
nDescription of all safety and protective elements and their
functions
nSummary of the health protection principles, safety and op-
erating rules to be observed when operating the air-handling
equipment
nList of requirements for operating staff qualifications and
training, nomenclature list of personnel authorized to oper-
ate the air-handling device
nDetailed emergency and accident instructions to be fol-
lowed by the operating staff
nOperating particularities in different climatic conditions (e.g.
summer or winter operation)
nInspection, checking and maintenance schedule, including a
list of checking steps, and their recording
Documentation Availability
e documentation delivered with the control system (original)
and operating documentation must be permanently available for
the operating and service staff and stored near the air-handling
equipment. e Installation and Operating Instructions are also
available at the website: https://www.remak.eu
Warning
e manufacturer reserves the right to make changes and amend
the documentation due to technical innovations and changes to
legislation without prior notice. Information on changes and
updates are always available at the website https://www.
remak.eu
Safety Measures
nWhen handling, installing, wiring, commissioning, repairing
or servicing the air-handling units, it is necessary to observe
valid safety rules, standards and generally recognized tech-
nical rules.
nIn particular, it is necessary to use suitable tools and person-
al protective work aids (e.g. gloves) because of sharp edges
and corners, respectively voltage, when performing any han-
dling, installing, dismounting, repairing or checking.
nAny changes or modifications to individual components of
the VCS control unit which could affect its safe and proper
functioning are forbidden.
ne air-handling equipment configuration and documenta-
tion must not be changed without the prior consent of the
manufacturer.
nAll connections of the equipment, including the VCS control
unit, to the power mains must be performed in accordance
with applicable local wiring standards and regulations.
nWiring installation, commissioning, maintenance and repairs
may only be performed by a specialized assembly company,
respectively an authorized person duly qualified in accord-
ance with generally valid regulations.
nBefore installing and using the air-handling units, it is neces-
sary to familiarize yourself with and observe the directions
and recommendations included in the following chapters.
ne air-handling equipment can only be operated in accord-
ance with the applicable Service Regulations. e operat-
ing staff must comply with the requirements included in the
Service Regulations, respectively with the manufacturer's re-
quirements (authorisation for some service activities).
nTo avoid unintentional unit start-up, the master switch must
be switched off and locked when repairing the VCS unit.
nIn winter, never turn off the main switch of the control unit
and the circuit breaker of the circulation pump of the heater
(except to ensure the safety of work on the equipment or
in the event of a malfunction of the equipment requiring its
shutdown).
Attention! in some cases, the main switch
may not disconnect all circuits!
ese are control circuits from foreign devices such as - switching
of demand for condensing units and heat pumps, signaling of
operation and faults, switching of the boiler room request and
others. See. the appropriate circuit diagram for specific VCS units.
Conditions for Handling
e device can only be commissioned, operated and serviced
by qualified personnel.
ne VCS control unit can only be operated by person-
nel provably trained and warned about possible dangers
(by the manufacturer or authorized representative of the
manufacturer) in accordance with the applicable Service
Regulations for the air-handling unit.
7
Control units VCS
Location, Installation
e units must be stored in rooms complying with the following
conditions:
nMaximum relative air humidity must not exceed 85%, with-
out water condensation
nAmbient temperature between –25°C and +60°C
Dust, water, caustics, corrosive agents or other materials nega-
tively affecting the structure or the unit’s components (causing
degradationof plastic partsandinsulation) mustnotenter theunit.
Installation and Location
e boxes are supplied according to the configuration as either
wall-mounted (for hanging on the wall) or freestanding (standing
independently on the floor). e placement of the VCS control unit
should consider easy access for operation and convenient cable
connection. e box must be installed separately with cooled side
walls. eventilatedbox shouldhave aminimumoffset of15 to20
cm from the side walls to ensure airflow for cooling and access for
filter replacement, which is installed in front of the fan. e surface
where the unit is installed should be smooth without irregularities.
When positioning the unit, it is important to have sufficient
space on the service side of the unit for maintenance and service
operations. ey can be mounted directly on substrates with fire
resistance classes A and B according to EN 13501-1.
e VCS control units in the switchboard boxes are mounted
in the vertical position directly on the wall. e KAEDRA plastic
switchboardbox canalsobe partiallyembedded underplaster. e
VCS unit installed in steel switchboard boxes can also be placed
directly on the floor. e cables can be run along cable trenches,
cable trays or under plaster.
e power cables are connected from below.
We recommend the wall-mounted units be fixed to the wall using
dowels and screws suitable for the wall structure.
e control units are designed for:
a)normal environment (indoor,withoutexcessive dust,moisture,
or the presence of explosive atmospheres in the air, etc.). e
permissible ambient temperature ranges from 0°C to +40°C (with
an average value not exceeding +35°C over a 24-hour period).
b) outdoor environment (light dust, humidity <90% relative
humidity without condensation, without explosive atmospheres
in the air, etc.). e permissible ambient temperature can vary
depending on the configuration, ranging from -25°C or -40°C to
+35°C (withanaverage valuenotexceeding +35°Cover a24-hour
period), and the maximum altitude is 2000m above sea level.
e placement of the outdoor box should be considered based
on local conditions. Particularly, direct sunlight should be avoided
as it can lead to failure to meet the necessary temperature condi-
tions (or overheating).
Note: As appropriate, the above-mentioned instructions apply
also for control units integrated into the air-handling unit while
observing the control unit installation and operating instructions
delivered with the air-handling unit. Check the completeness and
intactness of the delivery in accordance with the bill of delivery
before installation.
nIt is forbidden to remove, bypass or disconnect the safety
equipment, safety functions and guards.
nOnly air-handling components in perfect condition can be
used. Failures affecting the equipment safety must be re-
moved immediately.
nAll safety measures against electrical accidents must be
strictly observed. Any action resulting in restriction, even
temporary, of the safety and protection functions must be
avoided.
nIt is strictly forbidden to remove safety guards, casings or
other safeguards, operate the equipment or its components
if the safeguards are disabled or restricted.
nAny action resulting in restriction of the prescribed insulation
of the safety voltage must be avoided.
nWhen changing fuses, it is necessary to ensure the non-volt-
age state of the control unit and use only the specified fuses
and protection elements.
nIt is necessary to eliminate electromagnetic interference and
the harmful effects of over-voltage on the signal, control and
power cables, which could unintentionally initiate dangerous
actions and functions or cause destruction of the electronic
parts in individual components.
nNever work on the connected equipment under voltage! Be-
fore starting work on the air-handling unit, switch off and
lock the master switch to disconnect the supply voltage.
Use protective and work aids in accordance with the Service
Regulations and standards applicable in the country where
the unit is installed.
nIf individual technical assemblies of the air-handling unit are
equipped with service switches, and if allowed by the Service
Regulations, installation conditions and characteristics, then
such assembly (e.g. heater, fan, etc.) can be disconnected by
switching off and locking the corresponding service switch.
nNever use abrasive cleaners, cleaners unsuitable for plastics
or acid or alkaline solutions to clean to unit.
nAvoid splashing water, impacts and vibrations.
Each air-handling equipment component must always be
installed in accordance with the appropriate installation in-
structions.
e manufacturer recommends fully ensuring the flawless
condition and functioning of all protective elements and
equipment. Aer failures, such as short circuits, have been
removed, check the functionality of the automatic circuit
breakers and protective elements, and verify the condition of
the protective wiring interconnection and grounding.
To ensure safe operation, it is necessary to verify the condi-
tions of the water heating/cooling pumps – perform manual
pump turning and set the output curve (over-design impairs
the control quality).
Warning: If the remote control is used (including automatic
schedule program), safety access must be ensured for each
physical interference or entry into the air-handling unit (inspec-
tion, maintenance or repair) – i.e. disconnect the power supply
by turning off the switch – avoid remote initiation of the unit by
other users when work is being performed on the unit.
Transport and Storage
Before Installation
VCS control units are packed in cardboard boxes or installed in the
corresponding air-handling unit section, if they are integrated into
the air-handling unit. Measures for handling fragile goods must be
taken when handling the unit.
8
Commissioning
Fitting and Wiring Check
A careful check and verification of the wiring of all control
system components in accordance with the attached unit
wiring diagram must be performed before the first start-up.
e system cannot be connected to the power supply until
these checks have been performed.
First of all, it is necessary to check the presence, locations and
connections of the temperature sensors, fan thermo-contacts
and heaters in accordance with the M&C project. Further, the
connections of all error inputs must be checked.
It is also essential to check the fans, electric heaters, heat ex-
changers, filters and other parts of the connected air-handling
unit for correct fitting in accordance with the air-handling
accompanying documentation.
e above-mentioned checks must include a functionality
check of each component.
Special attention must be paid to the check of the conduc-
tive interconnection of all parts of the air-handling unit and
associated devices.
Conditions for Connection
e connections must be performed in accordance with the
applicable local wiring standards and regulations. Before put-
ting the unit into operation, an initial wiring inspection must
be performed in accordance with the national regulations.
Settings
e VCS control unit has been manufactured according to the
customer’s requirements (the project), and the basic param-
eters have been pre-set so that the unit is ready for operation.
With these settings, the control unit will start and begin the
control for the pre-set parameters providing the connection
of the unit has been performed correctly.
However, the professionals performing the unit commissioning
must always check or adapt the air-handling unit’s operating
parameters to the specific design and behaviour of the control
system and operating or local conditions.
It is especially necessary to pay attention to the control
constants and parameter, various correction values,
temperature modes and time schedules, optional modes
and functions.
e data points are accessible through the HMI control panel.
Setting the user access levels is an important part of the
settings procedure.
e default factory settings must be re-set according to the
user and service company needs.
e Access passwords are the basic pre-set parameters which
need to be reset when commissioning the unit, see the chapter
Control (HMI-SG).
Additional Settings:
nTo optimize the interaction between the control unit and
peripheral devices, it is necessary to set, using the HMI-
SG controller (see the List of Data Points in the section
Settings – Control Signal Characteristic), corresponding
values of the analogue signals for heating, cooling, heat
recovery and gas heating, optional from 0–10 V
and 2–10 V (pre-set).
e values 2–10V are suitable for REMAK or Belimo ac-
tuators.
Room temperature Measuring Point Selection
nUp to two room temperature sensors can be installed in
the air-conditioned room (HMI-SG controller with an inte-
grated temperature sensor plus one additional temper-
ature sensor, or two HMI-SG controllers with integrated
temperature sensors). e final room temperature val-
ue for the control can be set as the minimum, maximum
or average of both sensors (see the List of Data Points -
Temperature Measuring Point Selection).
Selection of the specific point for adjusting or measuring the
temperature value entering the control process results in more
accurate setting of the room temperature.
Warning
e device parameters are structured and made available
to users in accordance with their user roles (access levels).
ese roles must be assigned to the users according to their
expertise and responsibility for device operation.
Basic Application Parameterization
nDefault and common operation parameterization is de-
scribed in the chapter Control (see particular controller).
General Overview of Parameters
For a general overview of parameters available in the menu
and access authorization of users, refer to the chapter VCS
– Parameter Overview and Default Factory Settings. For the
menu with HMI controller parameters and default values, refer
to the chapters of individual controllers.
Important Notes
Correct assembly, installation, commissioning and proper
control are the essential conditions for flawless and safe
operation of the control unit. e components connected to
the control unit must correspond with the specification in the
control unit documentation.
e procedures specified by the manufacturer in the unit
documentation and the Service Regulations measures must
be observed throughout the unit service life.
Location of Control System Sensors
Inlet Air Temperature Sensor (NS 120)
Control and anti–freeze sensors must always be situated
behind the heater, respectively cooler – to measure the sup-
ply air temperature. ey must not be situated in the room.
VO antifreeze protection sensor (NS 130R)
e return water temperature sensor must be situated in
the return water line from the water heater so that it will be
sufficiently bathed in water. e heating water circuit must
ensure all the required functions for the water heater control
and safety when the unit is shut down (filling the system
with antifreeze mixture) as specified in the air-handling
device project documentation. A capillary tube can be used
as additional antifreeze protection. If it is not installed on the
air-handling unit by the manufacturer, the capillary tube must
be run (meandering way) through the entire cross-section of
the water heater’s rear side.
Commissioning
9
Control units VCS
Outdoor air temperature sensor (NS120)
Ideally, it should be situated in the outside environment – only
then are the control system’s functions ensured even in the
STOP mode or immediately aer unit start-up (e.g. moderate
pre-heating of the exchanger based on the actual outside
temperature, etc.). If the sensor is situated in the fresh air
inlet duct inside the building, the measured temperature is
only correct when the fans are switched on (air flows) and
the starting conditions are negatively affected – which can
endanger the air-handling device’s safety and even result in
the water heat exchanger breaking down.
Outdoor Temperature Sensor
– installed outside (NS110A)
e sensor (as with any thermometer) must be installed
so that objective outdoor temperature measurement will
be achieved. It must be protected against negative effects
like sunshine, rainfall, frost deposits, e.g. situating it under a
building’s roof, using outdoor VZT roofs, situating it in the inlet
louvers, inlet ducts or separate covering roof.
Commissioning, Connecting frequency inverters
Inlet Air Humidity Sensor
is is a duct sensor which must always be situated in an inlet
branch aer the air-handling unit. e selected position must
be representative enough for the measured value. It must not
be situated in the room.
Room Humidity Sensor
Optionally, a room or duct sensor can be used by the designer.
ne room sensor must be situated in the room in a "rep-
resentative" place so that it will not be influenced by local
effects (windows, doors, etc.)
ne duct sensor must be situated in the outlet duct from
the room – the advantage here is that the mean humidity of
the room outlet air is measured.
TH 167 Gas Heating Safety ermostat
e sensor must be situated before the gas heater section
behind the fan section. e thermostat must be situated so
that it will start the fans to protect the air-handling compo-
nents situated in front of the gas heater chamber if back air
flow occurs.
Air Quality Sensor – CO2(VOC, CO)
e air quality sensors are placed in the outlet air duct or in
the "representative" spots, thus ensuring objective air quality
value measuring.
VDK-10 Smoke sensor
e smoke sensor is installed in the piping of the inlet or outlet
branch, depending on the purpose of use. e VDK-10 sensor
must be oriented correctly to the air flow, on the upper or side
straight side of the duct, according to the manufacturer's
installation diagram.
Connection of the fan frequency inverters,
heat exchanger to the Modbus bus
Safety Conditions
nProperly carried out transport, storage, installation, com-
missioning and careful handling is the main condition for
correct and trouble-free operation.
nProtection, switching, wire routing and grounding must
fully comply with the local regulations applicable for wiring.
ne 230/400 V AC power wiring must be strictly separated
from the signal wiring (e.g. 24 V AC SELV)!
Wiring
nA shielded conductor must be used for the Modbus bus
connection. e maximum conductor length depends on
the communication speed. A maximum length of approx.
1000 m is recommended for the baud rate of 9600 Bd. e
recommended conductors are included in the documentation
created by the AeroCAD design program.
ne controller is connected to two terminals marked A+
and B- and to the REF signal detection reference voltage
terminal, which must always be interconnected with other
participants on the bus.
nTo ensure correct functioning of the bus, the first and last
device on the bus must be fitted with a terminal resistor.
e first device, i.e. the master controller, terminal resistor
setting is performed using the soware (ensured by REMAK
in the factory).
Figure 8 – Room sensor installation
Room Temperature Sensors
Optionally, a room (NS100), duct (NS120) or HMI-SG control-
ler integrated sensor can be used by the designer.
• e room sensor or HMI-SG controller with integrated room
sensor must be situated in a spot "representing" the room tem-
perature, and they must notbeaffected bylocal effects(heaters,
windows, vertical temperature distribution in the room, etc.)
• e duct sensor must be situated in the room outlet duct
– the advantage in this is that the average temperature of the
air flowing from the room is measured without being affected
by local effects (and it is hidden).
Heat Exchanger's Antifreeze Protection Sensor
(NS 130R)
e sensor must be situated in the outlet air duct behind the
heat exchanger.
EO Pre-Heating Control Temperature Sensor (NS 120)
To ensure correct control, the sensor must be situated behind
the electric pre–heater (EO) – before other temperature
adjusting components.
Flue Gas Temperature Sensor
e Pt 100 sensor is used to measure the flue gas tempera-
ture. e sensor must be situated in a representative place
within the flue gas installation.
10
Control and Protection Functions
e last device terminal resistor setting is performed on
the last frequency inverter in the line connection. Refer to
the Modbus bus wiring diagram. e setting procedure of
the last terminal resistor is described in the documentation
for a corresponding frequency inverter. A 120 Ohm resistor
connected between the communication can also be used to
terminate the wiring.
Figure 9 – Inverter connection to the Modbus RTU Figure 10 – Inverter association with a corresponding
section
terminal
resistor
RS485
FM1
Master
controller
FM2 FM3
Warning
e frequency inverter association cannot be exchanged
between different sections! For information about frequency
inverter association with a corresponding section, refer to
the figure.
Corresponding
section number
Order
number
5
0064 / 5
0064 / 5
Warning
Frequency inverters cannot be confused within different
sections! For proper assignment of frequency inverters to
respective sections, the inverters are labeled with attached
identification information (order/device + section, or unique
item number) and documentation showing the depiction of
the corresponding section to which the converter belongs.
Order (project)
Device (unit)
Frequency inverter item number
Relevant section
or item number label
Fan Failure Detection
nTo detect any fan failure, the motor thermo-contact and
differential pressure sensor are connected to the frequency
inverter inputs. e information provided by these elements
is transmitted through the Modbus communication line to the
control system, where it is processed.
Modbus RTU Communication Settings
nEach frequency inverter connected to the bus must be
assigned a unique address as defined in the control system
data points.
Pre-set Frequency Inverter Addresses – ModBus:
Inlet Fan
Inlet fan address =1
Backup or twin fan address =2
Backup twin fan 1 address =3
Backup twin fan 2 address =4
Outlet fan
Outlet fan address =5
Backup or twin fan address =6
Backup twin fan 1 address =7
Backup twin fan 2 address =8
Auxiliary Fan
Auxiliary fan address =9
Twin fan address =10
Rotary Heat Regenerator
RHR motor address =11
ne data points of all frequency inverters for communica-
tion with the Modbus bus must be set in accordance with the
VCS control unit:
• Baud rate (9600 Bd – pre-set)
• Parity (none – pre-set)
• Number of stop bits (2 stop bits – pre-set)
• Response time limit
• Number of data bits (as standard, 8 bits – pre-set)
All data points for the used frequency inverters are available
on our website: www.remak.eu
11
Control units VCS
tive antifreeze protection, fan state monitoring, filter fouling or
over-temperature detection of the required temperature. Any
deviations from the defined states or parameters are monitored
and signalled and simultaneously, safety features are activated.
Depending on the failure consequence, the following happens:
ne failure is only signalled and safety features are automati-
cally activated. Once the failure has ceased, the unit will return
to the standard mode without interference from the operator.
nIf a serious failure occurs, the unit will be switched to
the STOP mode, and it can only be restarted after the
failure has been removed and the operator's interference.
The VCS control unit system enables the air-handling
unit behaviour (fan action) to be set when fire is detected
(external failure, inlet or outlet air high temperature).
e settings can be as follows: the inlet or outlet fan is activated,
both fans are activated or both fans are stopped (air-handling
unit shutdown). e control unit is switched to the fire mode.
e settings can be performed using the HMI controller in the
List of Data Points, section Checks, System and Network Set-
tings – Fire Alarm.
Heating Control
Control is based on the required temperature, i.e. the selected
temperature mode and data from the supply air temperature
sensors, outdoor temperature and the water heat exchanger
return water temperature. Control can be affected by correction
values, maximum and minimum limits or antifreeze protection.
Water heating
It is controlled by the SUMX mixing set actuator using a 0–10V
continuous control signal (working range of 2–10V).
Heating Mixing Set Pump Control
e mixing set pump is controlled depending on the outdoor
temperature value and valve position (required heater output).
nIf the air-handling unit is in the STOP and Run mode, the pump
is switched on when the outdoor temperature drops below 5°C
and switched off when the outdoor temperature rises above
6°C. In this case, the pump is stopped without any run-down.
nIf the air-handling unit is in the Run mode, the pump is controlled
by the valve actuator control algorithm. e pump is switched
on when the request for the valve opening is higher than 5%.
nIf the pump has not been used for 168 hours, it will be switched
on and turned for 60 seconds.
nFailures (electrical) of the pump are sensed by the pump circuit
breaker’s auxiliary contact even in the STOP mode.
Water Heater Antifreeze Protection Operation
e VCS control unit uses so-called active antifreeze protection.
It uses a three-stage concept. Antifreeze Protection Features:
nSwitching of the unit to the STOP mode
nSwitching off of the fans
nClosing of the dampers
nFreezing danger signalling
nMixing set control
nPump starting
nIf the air-handling unit is in the Run mode, then antifreeze
protection is activated when the outdoor temperature drops
below 10 °C (factory settings) and the water heat exchanger
return water temperature drops below 15 °C (factory set-
tings).
Control and Protection Functions
Note: is chapter describes only the basic control functions – the
detailed design, respectively compatibility, of the entire device
is ensured by the configuration performed using the AeroCAD
design soware. For more detailed information, contact the
manufacture, REMAK a.s.
Main Control Features
e VCS control unit enables automatic control of the following
basic functions for air temperature adjustment:
nHeating
nCooling
nMixing
nRecuperation (Heat Recovery)
nDehumidification
nHumidification
nPID controllers with pre-set control constants are assigned for
all the above-mentioned functions. Basic settings of parameters
are performed in the factory. e parameters can be changed
using the HMI controller in the List of Data Points menu, part
Settings – Control Constants.
nA check, respectively optimization, of the unit settings must
always be performed when commissioning the unit.
nControl ensures energy-saving operation. Cascade tem-
perature control – room temperature control or supply air
temperature control.
ne required temperature for the air-conditioned room can
be set by selecting one of two temperature modes – comfort
or economy. Each mode has two pre-set temperature values
to maintain the required temperature (an upper limit for heating
and a lower limit for cooling). ese values can be changed using
the HMI controller in the List of Data Points, section Settings –
Temperature Modes.
nFirst, the control algorithm will start to control the func-
tions which don't require energy, i.e. heat-recovery and mixing
(depending on the user option). If this is not enough to maintain
the required parameters or these features are not included in the
air-handling unit, heating and cooling functions will be applied.
If the heating or cooling control is not effective enough, an air
output control will be added (heating/cooling-dependent fan
speed compensation or cooling control – user option).
nIf the unit is also configured for humidity control, the setpoints
for dehumidification (upper humidity limit in the room) and/or
humidification (lower humidity limit) are available for setting in
the HMI menu under Settings - Humidity Modes.
Temperature Correction and Limitation
e control unit enables adjustment and settings of the restricting
limits for maximum and minimum supply air temperatures. In
addition, it is possible to set the supply air and room temperature
limits, respectively other correction or comfort options (e.g. set-
point value compensation or heating/cooling-dependent fan
speed compensation).
Main Control Feature and
Protection Description
Using the appropriate sensors, the VCS control unit can provide
comprehensive protection of the air-handling unit, such as ac-
Control and Protection Functions
12
e extent of the mixing valve opening depends on the water
heat exchanger’s return water temperature value. Antifreeze
protection will be deactivated when temperatures rise above
the limit parameters.
nIf the air-handling unit is in the STOP - STAND-BY mode,
then antifreeze protection is activated when the outdoor
temperature drops below 10 °C (factory settings) and the
water heat exchanger’s return water temperature drops
below 30 °C (factory settings). e extent of the mixing valve
opening depends on the water heat exchanger’s return water
temperature value. Antifreeze protection will be deactivated
when temperatures rise above the limit parameters.
ne control unit continuously monitors the water heat
exchanger’s return water temperature. If the temperature is
still falling and drops below 8°C (factory settings), the following
protection actions will be immediately taken regardless of the
outdoor temperature:
ne air-handling unit will be shut down, the dampers will
be closed, the fans will be switched off and the failure alarm
will be activated.
ne mixing valve will be opened depending on the water
temperature, and the circulation pump will be switched on.
ne above-mentioned state will last until the operator
checks the air-handling system or removes the failure cause
and confirms the air-handling system is free of failure and
resets the failure.
ne control unit simultaneously monitors the supply air
temperature in the Run mode. If the supply air temperature
drops below 6 °C (factory settings), the following protection
actions will be immediately taken regardless of the outdoor
temperature:
ne air-handling unit will be shut down, the dampers will
be closed, the fans will be switched off and the failure alarm
will be activated.
ne mixing valve will be opened depending on the water
temperature, and the circulation pump will be switched on.
Pre-Start Unit Pre-Heating Functions
nTo avoid false freezing danger assessment in winter or
during transition seasons, especially when the air-handling
unit is being started, the control unit features a heating
circuit pre-heating.
nPre-heating is dependent on the outdoor temperature
value. If the outdoor temperature is higher than 10 °C, the
value of the valve opening will be 0 %, and pre-heating will
not be activated.
Pre-heating will be activated when the outdoor temperature
drops below 10 °C. e mixing set valve will be forced to open
to the value which is derived from the outdoor temperature
(factory settings: +10 °C = +10 %, -10 °C = 100 %) for 120
seconds. Once this time has elapsed, the valve will be closed,
"ramped down", until the mixing set control signal for heat-
ing is reached.
nIf the air-handling unit is restarted within 5 minutes of the
moment the air-handling unit was shut down, pre-heating
will not be activated.
nAntifreeze protection setting parameters can be accessed
through the HMI controller in the List of Data Points menu,
sections Parameters and Control Constants.
Control and Protection Functions
Electric Heating
Electric heating can be controlled using the following options:
nSwitching of the full EO, EOS heater output
nSequential switching of the EOSX electric heater’s indi-
vidual sections
nSequential switching of the EO heaters
nControl of the EOS electric heaters using a PV valve (up
to 45 kW)
Electric heater protection
nIf electric heater overheating (failure) is signalled (the
temperature inside the heater exceeds +80 °C) by opening
the emergency thermostat contacts in the heater, this signal
is interpreted by the control unit.
nElectric heater control in the REMAK unit is doubled – the
heater thermostat failure signal is simultaneously sent to the
controller and auxiliary module.
ne controller will interpret the failure signal and perform
appropriate safety functions; first, the control signal for
electric heating is blocked and then the heater contactor is
disconnected.
ne auxiliary safety module will mechanically disconnect
the EO/S/X circuit breaker (i.e. it will trip the under-voltage
trigger of the circuit breaker).
At the same time, control logic will ensure safe cooling of the
heater when the air-handling unit is being shut down – transi-
tion to the STOP mode. e controller will ensure run-down of
the fans (optional) so that the heating core is cooled.
Gas heating
e gas heater is controlled using a burner output controller
and a bypass damper (if the section is equipped with a BP
damper). The required heating temperature is controlled
depending on the required temperature (selected mode) and
the readings from the inlet temperature, outdoor temperature
and flue gas temperature sensors.
Gas Burner Output Control
nSingle-stage ON/OFF control
nTwo-stage control (two output stages)
nModular (three-point), step-less control of the entire burner
output range
Burner lighting is contingent on the fan operation.
At a 5 % request for heating, the 1st burner output stage is
switched on. e minimum pre-set running time of this stage
is 150 seconds. If the required temperature is not reached,
the 2nd stage will be switched on at 70 % of the request for
heating (two-stage output control). e second output stage
is not restricted to the minimum running time, and will be
switched off at 40 % of the request for heating.
Further re-lighting of the burner is possible once the protec-
tion time of 150 seconds has elapsed. Modular control of
the burner is step-less based on the actual requirement (set
point) within the Min to Max output range of the gas burner.
e bypass damper (if included in the section) is controlled by
a 0-10V signal (the operating range is 2–10 V depending on
the required flue gas temperature (160 °C pre-set). e regulat-
ing damper position controls the air flow coming through the
gas section and bypass section so that a constant flue gas
temperature is maintained. Accordingly:
13
Control units VCS
Control and Protection Functions
nwhen Tflue gas > Tflue gas required the bypass damper closes
(closed = 0 V)
nwhen Tflue gas < Tflue gas required the bypass damper opens
(open = 10 V)
Protective and Safety Functions
The control unit ensures fan run-down to cool down
the gas sections (the pre-set run-out time is 180 s).
e gas section (chamber) temperature for protection and
safety functions outside the VCS control system is picked up
by the ESD3J triple electronic safety thermostat (located on
the chamber) while the temperature before the heater cham-
ber is picked up by the TH167 stem thermostat (it is necessary
to install this thermostat when connecting the control system
and set it to 50 °C). e system of safety thermostats along
with the control unit provides the following functions:
nIf a temperature of 50 °C (T3) is exceeded, even in the
STOP mode, forced switching of fans (and opening of damp-
ers) is activated in order to cool down the heater chamber.
nIf a temperature of 80 °C (T2) is exceeded in the Operating
mode, the heater output control signal is switched off. When
the temperature falls, this signal is switched on again. is is
an operation safety function with no signalling of the failure.
nIf a temperature of 110 °C (T1) is exceeded, forced discon-
nection of the burner from the supply voltage is performed
and this state is maintained until the thermostat is reset by
the button located on its body. e reset cannot be performed
until the chamber has cooled down to below the tempera-
ture evaluating threshold. Before the burner can be reset or
restarted, it is necessary to evaluate and remove the reason
for overheating (by-pass cannot be closed, insufficient air flow
though the heat exchanger, exhaust gas temperature setting,
etc.). e T1 stage of the triple thermostat is detected by the
control unit (including/in series with the burner failure when
it is not disconnected form the power supply) which initialises
the Burner (heater) failure message and switching off of the
unit (STOP) with run-out of fans to cool down the chamber.
nIf the air back draught (chimney effect) occurs during the
STOP mode and the air temperature in front of the gas section
rises above 50°C, the TH 167 thermostat will close and switch
on the fans, open the inlet and outlet dampers, and thus the
gas heater will be cooled down.
nFan failure – the unit is immediately switched to the STOP
mode without fan run-out (evaluated also during the STOP
mode).
ne control unit monitors the states of the control sensors
and evaluates exhaust gas overheating as well as failures of
sensors.
Heating and Cooling using Heat Pump
Two general control options are available for heat pumps.
Control is not fixed to a specific heat pump type. e control
option selection depends on the designer’s consideration
and heat pump type. Two control contacts and an analogue
output are used for control.
Option A
e first digital contact is used to define the air temperature
adjustment type – cooling/heating. e second digital contact
is used to define the process activation – off/on. e analogue
Cooling Control
All cooling sources can be disabled depending on the outdoor
temperature. Cooling is not disabled if the outdoor tempera-
ture is higher than the pre-set cooling enable temperature
(pre-set 12 °C).
Water Cooling
It is controlled the same way as water heating. e mixing
set pump is switched depending on the control signal for the
cooling valve. If the air-handling unit is in the Run mode, the
pump will be switched on when the control signal for the cool-
ing valve is higher than 5% and switched off when the control
signal for the cooling valve is lower than 1%.
nPump turning for 60 seconds is performed aer every 168
hours of pump inactivity.
Direct Cooling
Direct cooling is controlled by switching the condensing unit
output or by step-less control of the inverter condensing unit.
If a single-circuit condensing unit is used, it will be switched on
when 20 % of the control signal is required and switched off at
10 % (10 % hysteresis) of the control signal. If a double-circuit
condensing unit, respectively two single-circuit condensing
units are used, two stages will be switched.
e first stage will be switched on when 20% of the control
signal is required and switched off at 10% (10% hysteresis) of
the control signal. e second stage will be switched on when
70 % of the control signal is required and switched off at 60 %
(10 % hysteresis) of the control signal.
output 0..10 V represents the proportion of the request for
heating or cooling.
Option B
e first digital contact is used to define the heating process
– heating off/heating on. e second digital contact is used to
define the cooling process – cooling off/cooling on.
Analogue output 0..10 V represents the proportion of the
request for heating or cooling.
e heat pump control is equipped with an outdoor tempera-
ture-dependent blocking. e blocking alert is only informative
and is not a failure state. e heat pump will be shut down if
the outdoor temperature is equal to or lower than the refer-
ence temperature (see the Data Points). e heat pump will be
started if the outdoor temperature is higher than the reference
temperature (with hysteresis of 3 °C). Frequent switching of
the heat pump is eliminated by blocking of the cooling/heating
restart for 120 seconds. e minimum operating time of the
heat pump can also be set. When cooling/heating is required,
the heat pump will be switched on at 20% of the control signal
and switched off at 10% of the control signal (hysteresis of
10%). e low reference signal on the analogue output (0-10V)
can be set in a range from 0% to 50 % of the control signal
(pre-set 30 %, i.e. a 3-10 V control). e unit can be equipped
with a function blocking the air-handling unit operation when
defrosting the heat pump. e shut-off state of the air-handling
unit is indicated on controllers. Aer the heat pump defrosting
process has been completed, the air-handling unit operation
will automatically be resumed.
Furthermore, it is possible changing behaviour of different
control signals, e.g. AO signal inversion (see Data Points).
14
Control and Protection Functions
Frequent switching of the single-stage condensing unit is elimi-
nated by repeated cooling blocking for a certain time depending
on the setting. To eliminate the simultaneous switching of both
stages at a sudden control signal increase, the timing (duration
of the first stage) is set.
Inverter Cooling Unit
It is controlled using the start enable signal and step-less com-
pressor output control signal. e minimum operating time can
also be set. e condensing unit will be switched on when 20 %
of the control signal is required and switched off at
10 % (10 % hysteresis) of the control signal. e unit compressor
speed is controlled using a 0–10 V control signal.
VCS can be configured for (progressive) control of up to three
inverter condensing units (including their occasional swapping
in order).
Inverter Unit and Single-Stage Condensing Unit
Combination
When cooling is required, the inverter will be switched on first and
then the output will be raised to the maximum. Consequently,
the single-stage condensing unit is switched on while the inverter
output is lowered to 30 % of the control signal. If the request for
cooling is still rising, the inverter output will be increased from 30
% up to the maximum level of the control signal. If the request for
cooling is decreasing, the inverter output will start to decrease
and will be switched off at 0% of the control signal. e single-
stage condensing unit is still in operation. In this phase of control,
time blocking of the inverter is applied and simultaneously the
single-stage condensing unit is prevented from being switched
off. If the request for cooling is still decreasing once this time has
elapsed, the inverter will be switched on with a maximum control
signal and the single-stage condensing unit will be switched
off. When the single-stage condensing unit is switched off, the
inverter output will be at the maximum. en the inverter output
is reduced in accordance with the request. us step-less control
is ensured in the entire cooling capacity range.
Direct Evaporator Protection
is protection is ensured using the CAP 2M capillary thermostat,
which disconnects the control signal in the event of ice build-up
on the evaporator. If two evaporators are used, each of them will
have its own thermostat.
Heat Recovery Control
e control of the rotary/plate heat exchanger is realized as
follows: When using an asynchronous motor with a frequency
converter, the control is via the Modbus communication bus,
when using a stepper motor with a control unit, the control is a
0-10V continuous signal. Plate heat exchanger, resp. e bypass
of the plate heat exchanger is controlled by a continuous signal
0–10 V (2–10 V). e magnitude of 100% of the control signal
with continuous control corresponds to 100% recuperation, ie
the maximum speed of the rotary heat exchanger or the closed
bypass of the plate heat exchanger. Another option is to use a
digital output for two-point control (ON / OFF) - it is possible to
switch e.g. a glycol circuit pump.
Heat Exchanger Antifreeze Protection
nIn the case of a rotary heat exchanger, protection can
be provided by a temperature sensor NS 120 or TGL100
on the air extraction behind the rotary heat exchanger.
If the freezing temperature drops below the set value, the speed
of the rotary heat exchanger starts to decrease. If the speed
reduction of the rotary heat exchanger is not sufficient, the rotary
heat exchanger is stopped to ensure defrosting. e reduction of
the rotary heat exchanger speed depends on the setting of the
PID controller constants.
nSimilarly as the rotary heat regenerator, control of the plate
heat exchanger is ensured using the NS 120 temperature sensor
and bypass actuator control. If the temperature behind the plate
heat exchanger drops below the pre-set ice build-up threshold,
the bypass damper actuator will be activated and the damper will
stay open until the ice build-up melts from the heat exchanger. A
pressure loss sensor or a CAP 3M capillary probe can also be used
in some cases. Protection of the plate heat exchangers without
bypass can be ensured by a fan speed reduction.
Plate heat exchanger – AHU run-out
In some cases, the run-out will be performed when the air-han-
dling unit is stopped. is will ensure drying of the heat-exchanger
and prevent the creation of conditions for the growth of microor-
ganism. Temperature and humidity sequences are active during
this run-out. is feature is conditioned by previous operation of
the heat recovery and the outside air temperature. As default,
this feature is switched off. For the change in all values, refer to
List of Data Points – Fans.
Rotary heat exchanger wheel clogging
e protection ensures that the rotary heat exchanger is not oper-
ated outside the permitted pressure limits, which can cause the
wheel to deform. is phenomenon occurs especially when the
wheel is clogged. We use P33 pressure sensors. When reporting
a fault, it is necessary to check the rotary heat exchanger and
remove any impurities.
Rotary heat exchanger – cleaning function
If the wheel is stopped for more than 30 minutes, the cleaning
function is activated and the wheelwill rotate at minimum speed
for 10 seconds. is function can be set in the recuperation menu.
Warning: e rotary heat exchanger can run even when the unit
is in the Stop state.
Mixing Damper Control
It is ensured by step-less control of the mixing damper actuators
using a 0–10V (2–10V) continuous signal. e signal is directly
proportional to the air circulation, i.e. 100 % of the signal corre-
sponds to 100 % of the required air circulation (0 % of fresh air).
e maximum level of air recirculation (when the fans are running)
is limited by the minimum (hygienic) request for fresh air. If the
device is in the STOP mode, the inlet and outlet duct dampers
are closed and the circulation damper is open.
Heat Recovery and Mixing Economy Control
If the temperature in the room (in the outlet duct) is lower than
the outdoor temperature and a request for cooling simultane-
ously exists, the heat recovery and air recirculation functions will
be automatically switched on at the maximum level to minimize
the energy demand for cooling. is happens if the temperature
difference reaches 2 °C (the room temperature is lower than
the outdoor temperature) while the temperature in the room
(in the outlet duct) is higher than the required temperature and
15
Control units VCS
Control and Protection Functions
the difference between these two temperatures is at least 1 °C.
Heat recovery and mixing functions will be switched off when
the outdoor temperature is lower or equal to the room (outlet
air) temperature, or the room (outlet air) temperature is higher
or equal to the required room temperature. Heat Exchanger
control function activation settings are described in the chapter
Additional Operating Mode and Function Setting Options.
Heat Recovery and Mixing Control
at Air-Handling Unit Start-Up
e starting outdoor temperature and time are set for heat
recovery and mixing (see Data Points). If the outdoor temperature
is lower than the pre-set value at the air-handling unit start-up,
the heat recovery and mixing functions will be switched on at
the maximum level.
Mixing Sequence Selection
e mixing sequence for heating control is optional – the pre-set
sequence for heating is as follows: first, the mixing function is
applied and if the request for heating still increases, then the
heating function will be applied (pre-set). is sequence can be
changed according to user needs, see the chapter Additional
Operating Mode and Function Setting Options.
Humidity Control
e control unit evaluates the control signal for humidification
or dehumidification depending on the room and inlet humidity
sensors and the required humidity selected by the user.
Humidification
Humidification control can be ensured by two methods. Depend-
ing on the technology used, control for the required humidity
can be performed by the VCS control unit or by an autonomous
control (e.g., integrated into the humidifier).
In the first case, humidity control is ensured by the VCS control
unit. Settings of humidity set-points and control parameters are
included in the VCS control unit. e same applies for dehumidi-
fication. us, full accord of dehumidification and humidification
control is ensured and unsuitable settings of set-points cannot be
made. Furthermore, all the necessary parameters and informa-
tion can be found in the control unit controllers. e control unit
sends the start command, the request for humidification output
to the humidifier, and monitors humidifier failures.
If autonomous control is used, the control unit sends information
on the air-handling unit operation to the humidifier. In this case,
control for the desired humidity is fully ensured autonomously by
a specific humidifier. e control unit has no information about
the state or output of the humidifier.
Dehumidification
Air dehumidification is ensured by water or direct cooling. In case
of dehumidification, aer-heating is ensured by the heater, which
is situated aer the cooler. e control unit evaluates the control
signal for the air cooler and heater depending on the room sen-
sors and the required humidity selected by the user. e humidity
in the room can be set from 20% to 95%. If the air-handling unit
is equipped with a water cooler or a condensing unit with an
inverter, the humidification process can be controlled using 0–10
V (2–10 V) step-less control. If the air-handling unit is equipped
with a one-stage or a two-sage condensing unit, the humidifica-
tion process is controlled using step control. When cooling is
active due to a request for dehumidification, air aer-heating is
allowed (exceptionally) using the heater situated aer the cooler.
If the request for heating is increased above 90 %, the request for
dehumidification cooling is gradually reduced until the required
inlet air temperature, respectively zero value of the request for
cooling (at 100 % request for heating), is achieved – temperature
control is prioritised to humidification.
Auxiliary Control Functions
Pre-heating function
Pre-heating is switched ON/OFF depending on the pre-set
outdoor temperature value (pre-set 5 °C).
e electric pre-heater (EO) is switched using a contactor. It is
controlled according to the pre-set (required) temperature and
compared with the temperature behind the preheater (measured
by the NS 120 sensor). If the air-handling unit is switched off
when the EO pre-heater is active, run-down of the fans will be
performed. Failures are evaluated similarly as with EO heaters
but the system is not shut down.
Water pre-heating is controlled by switching the pump (not
included in the REMAK delivery) depending on the request for
pre-heating. Antifreeze protection is ensured by a temperature
sensor (NS130R) situated in the water heat exchanger return
line. If the water temperature in the water heat exchanger’s
return line drops below the pre-set value, the freezing alarm will
be activated, including safety functions, and the air-handling unit
will be stopped.
Auxiliary Aer-Heating
Function – electric/water
is function is applied when the main heater output is not suf-
ficient (e.g. when water heating is shut down during transition
seasons, etc.) It is possible to restrict the maximum electric
aer-heater output for each output stage. us correct cooling
of the heating rods is ensured (see the Data Points). e electric
aer-heating function can also work as an independent sequence
with its own settings of required temperatures. e electric aer-
heating function is disabled in the following cases:
nWhen night chilling is active
nDuring temperature start-up
Heating Water Source Switching
e hot water demand is evaluated by one of the following
conditions:
1) e controller evaluates the heating water demand. e
outdoor temperature is lower than the set (calculated) supply air
temperature (air heating demand arises).
2) e outdoor temperature is lower than the limit value
for heating (see data points - switching parameter of the
heating water source). Factory setting 15 ° C.
3) If a freeze is declared on water or in the air.
is switches on the output for switching the heating water
source (boiler) - in the case of starting the device in advance
before starting the fans. e correct functionality of the system
must be ensured by suitable setting of the related parameters
of the device start sequence. To use the switching function
of the heating water source, the outdoor temperature sen-
sor must be installed so that it actually senses the outdoor
temperature.
16
Figure 11 – Actual set-points with compensation (shi)
Control signal for controller
heating
H shi
cooling
C shi Room set-point
TH1......Basic set-point of the required temperature for heating – upper heating limit
TH2......Actual/current set-point of the required temperature for heating – upper heating limit = (TH1 - shi H)
TC1 ......Basic set–point of the required temperature for heating – upper cooling limit
TC2 ......Actual/current set-point of the required temperature for heating – upper cooling limit = (TH1 -shi C)
H shi for heating set-points (A negative shi causes a reduction in the required temperature for heating.)
C shi for cooling set-points (A negative shi causes a reduction in the required temperature for cooling.)
Figure 13 – Set-Point Compensation (Shi)
T3.....Starting point for heating compensation
T4.....End point for heating compensation
c........Max. compensation value (delta T)
x.........Actual outdoor temperature
y.........Required heating set-point shi
T1.....Starting point for cooling compensation
T2.....End point for cooling compensation
C........Max. compensation value (delta T)
X........Actual outdoor temperature
Y........Required cooling set-point shi
delta T (K)
Outdoor temperature (°C)
Heating compensation settings Cooling compensation settings
Control and Protection Functions
Fan Speed Compensation
e VCS control unit system enables the pre-set fan speed to be
adjusted depending on the air temperature, air quality or mixing
damper position using fan speed compensations. e sum of
individual compensations creates a so-called total compensation
which affects the fan speed change.
Outdoor Temperature-Dependent Fan Speed
Compensation
e compensation adjusts the fan speed in regards to high or
low outdoor temperatures. e fan speed is adjusted depending
on the maximum heating or cooling compensation settings. A
positive compensation value represents a fan speed increase. A
negative compensation value represents a fan speed reduction.
Note: To make the compensation effective, it is necessary to
set a suitable maximum compensation value if only one com-
pensation is used.
Room (Outlet) Temperature-Dependent Fan Speed Com-
pensation
e fan output is adjusted depending on the required room
temperature and the measured room (supply air) temperature.
e compensation will be activated if the measured temperature
is lower than the required temperature.
Using the compensation function, the fan speed can either be
increased or reduced.
Heating/Cooling-Dependent Fan Speed Compensation
e request for heating or cooling is evaluated by measuring the
supply air temperature and comparing it with the required supply
air temperature and then followed by fan output compensation.
e compensation will be activated if the difference between
the required supply air temperature and the actual supply air
temperature is greater than the pre-set temperature hysteresis.
e actual correction extent is related to the settings of the PID
controller constants.
nHeating Compensation: It reduces the fan output and thus
sufficient supply air heating is achieved based on the smaller
air volume (used to eliminate insufficient output of the heat
exchanger).
nCooling Compensation: It increases the fan output (higher
air-flow rate) and thus makes the room environment more
comfortable, if cooling is insufficient.
is type of compensation also enables a change to the priority
cooling – fan. So the change in the fan speed is applied first
and then active cooling is applied as the request for cooling is
rising. e settings can be performed using the HMI controller,
refer to the chapter Additional Operating Mode and Function
Setting Options.
Air Quality-Dependent Fan Speed Compensation
e fan output can be adjusted depending on the measured CO2
(VOC, CO) content and the pre-set required value. If the CO2(VOC,
CO) content is higher than the pre-set (permissible) value, the fan
speed will be increased. e compensation extent is affected by
the settings of the PID controller constants. e measured value
range must be set depending on the sensor used. Further, the
sensor characteristic (Normal ascending for CO2and VOC or
Inverse descending for CO) must be set. For the settings, refer
to the Data Points.
Temperature Required Value Compensation
Temperature compensation is actually a correction (shi) of the
required value (set point) of the controlled (room) temperature
according to the outdoor temperature sensor reading, which
adjusts (in addition to other correction values) the temperature
specified in the temperature mode settings. It is mainly used to
reduce differences between outdoor and indoor temperatures
(to eliminate thermal shocks) and the energy demand of device
operation. On the other hand, it can increase differences ("ag-
gressiveness") in control, if adjusted reversely.
Note: e data point values on the controller are described in
full text (not using abbreviations like TH1, TC1, etc.). Generally,
minus control is also possible.
Heating cable switching
In cases where a heating cable is used as a frost protection for
condensate drain siphons, the control unit ensures its switching
according to the outside temperature. e preset switching
temperature is 2 ° C (hysteresis 1 K), the power according to the
cable used is self-regulated.
T3.....Starting point for heating compensation
T4.....End point for heating compensation
c........Max. compensation value (delta T)
x.........Actual outdoor temperature
y.........Actual fan speed shi for heating
T1.....Starting point for cooling compensation
T2.....End point for cooling compensation
C........Compensation value (delta T)
X........Actual outdoor temperature
Y........Actual fan speed shi for cooling
delta speed (%)
Outdoor temperature (°C)
Heating Compensation Settings
(Winter)
Cooling compensation settings
(summer)
Figure 12 – Fan Speed Compensation Description
17
Control units VCS
Control and Protection Functions
Air Quality-Dependent Damper Position
Compensation
Functionality is similar and the settings are common with the
air quality-dependent fan speed compensation. e fan output
or mixing damper position can be affected by the difference
between the measured and pre-set required CO2(VOC, CO) con-
centration in the room. e volume of fresh air will be increased if
the measured value is higher than the required value. e volume
of circulated air will be decreased. e compensation extent is
affected by the settings of the PID controller constants.
Humidity-dependent Damper Position Compensation
If dehumidification using cooling is not sufficient (or not available),
humidity-dependent mixing damper position compensation is the
next step. is is adjusted depending on the required humidity
and measured humidity in the room. If the measured humidity is
higher than the required humidity in the room, the compensation
will be activated.
Humidity-dependent Fan Speed Compensation
e fan output is controlled depending on the required humidity
and measured humidity in the room. If the measured humidity is
higher than the required humidity in the room, the compensation
will be activated. e compensation function can either be set to
increase or reduce the fan output.
e compensation functions can be enabled using the HMI
controller, refer to the chapter Additional Operating Mode and
Function Setting Options.
Fan Speed Control
e VCS control unit enables either soware or manual air output
control, i.e. the speed of the following fans:
nSingle-speed fans (ON/OFF control)
nTwo-speed fans (two-stage control)
nSingle-speed fans’ backup (ON/OFF control)
nFive-stage TRN voltage controllers
nFan frequency inverters using the Modbus bus – five-stage
control
A standard control can be completed with a 3rd auxiliary fan
which is controlled from the outlet or inlet fan depending on the
control unit configuration.
Two-Speed Fans
e two-speed fans are always started using the first stage at
the air-handling unit start-up. e transition time from the first to
second stage can be adjusted. e transition time can also be ad-
justed for the reverse transition from the second to the first stage.
TRN Voltage Controllers
e control unit enables the voltage controllers to be connected
and controlled in five output stages. Depending on the request,
inlet and outlet control can be common or independent. e
required output stage is always set in common. If the fans are
controlled independently, it is possible to set the outlet control-
ler correction against the inlet controller (see the Data Point
Settings – TRN Correction). However, the control unit must
be specially manufactured for this function (depending on the
customer request). Either the same correction can be set for
all the speed stages or for each speed stage independently. For
the correction settings, refer to the chapter Optional Function
and Mode Settings.
Single-Speed Fan Backups (ON/OFF Control)
e backup motor is started if the main motor fails. e backup
is used either for the inlet or outlet fan, respectively for both. e
motors are equipped with thermal protection (thermo-contact)
and current protection. If the backup motor has been started, it
is not possible to restart the main motor without resetting the
failure. e main and backup motor current protection has a delay
pre-set. Switching from the main to backup motor is immediate
without delay if the main motor fails.
Backup fan control via Modbus communication bus
Using the Modbus communication bus, the five-stage fan control
enables a backup fan or a pair of backup fans to start up if the
main fan fails. If the backup fan or pair of backup fans fails, the air-
handling unit will be shut down. Information about air-flow failures
and motor overheating is sent via the Modbus communication
bus and signalled accordingly.
e fan speed control parameters are available through the HMI
controller in the List of Data Points in the section Settings – Fans
(inlet fan backup, outlet fan backup, TRN correction).
Dpmax = V2
max
k 2
Constant Air Flow/Pressure Control
When designing constant flow, pressure, overpressure and
underpressure control, it is advisable to consider the overall
design of the air-handling unit, respectively application of the
mixing damper, and how the control behaviour can affect the
measured pressure value.
Constant Air Flow Control
Fan speed is controlled depending on the desired air flow rate
(m3/h). e air flow rate (air pressure in the diffuser recalcu-
lated to the air flow rate using the "k-factor") is measured by a
sensor; the control system evaluates this value and compares
it with the required value. e resulting fan speed is controlled
so that the required air flow rate will be reached at the point
of measurement (fan diffuser).
It is necessary to set the following pressure sensor pa-
rameters (see the Sensor Operating Manual):
nMode (for CPG = Mode 5.00)
nMeasuring range: As needed
e correct range can be determined
using a formula:
(where k = "k-factor", Vmax = designed air flow rate of the
device). e correct sensor range is then set according to the
calculated pmax value.
nK-factor of the respective fan
It is necessary to set the following parameters of the VCS
control Unit (see List of HMI Data Points):
nAir flow sensor measuring range – (maximum value from
the CPG air flow sensor in m3/h)
nis can be calculated using the formula or read from the
CPG sensor menu (see the Sensor Operating Manual).
ne maximum measured air flow rate can be calculated
according to the following formula:
Vmax = k × DPmax
18
Control and Protection Functions
Figure 15 – Constant pressure control
Constant pressure control
Fan speed is controlled depending on the desired air pressure
(Pa). e air pressure is measured by a sensor; the control
system evaluates this value and compares it with the required
value. e resulting fan speed is controlled so that the required
air pressure will be reached at the point of measurement.
It is necessary to set the following air flow sensor param-
eters (see the Sensor Operating Manual):
nMode (for CPG = Mode 4.00)
nMeasuring range: As needed (200 Pa, resp. 1000 Pa)
It is necessary to set the following parameters of the VCS
control Unit (see List of HMI Data Points):
nAir pressure sensor measuring range – (maximum value
from the CPG air pressure sensor in Pa)
nRequired values (separately for the inlet and out-
let fans). 5 required values are available for selection.
Constant Air Flow + Overpressure in the Room Control
e inlet branch (fan) is adjusted to the constant air flow so
that the required air volume is delivered to the room. e outlet
branch is adjusted to the required difference in overpressure in
the room. us, the outlet fan is adjusted to the required pres-
sure (overpressure) depending on the pressure sensor location.
Application: Preventing dirt from entering the room.
Constant Air Flow + Underpressure in the Room Control
e outlet branch (fan) is adjusted to the constant air flow.
e inlet branch (fan) is adjusted to the difference in under-
pressure in the room. us, the inlet fan is adjusted to the
required pressure (underpressure) depending on the pressure
sensor location.
Example: K-factor = 308, Maximum sensor range Pmax =
2000 Pa, Vmax = 13774 m3/h. is value is then entered
as the maximum range of the sensor in the VCS using HMI.
Note: In AC, the "Max. Air Flow Rate" is stated for the fan as-
semblies. Attention! is is not the maximum range of the air
flow sensor to be entered in the VCS control unit.
nNumber of fans (for twins = 2). e air flow rate of one fan
is measured and is then multiplied by the number of fans.
nRequired values (separately for the inlet and outlet fans)
5 required values are available for selection.
Application: Preventing dirty air from entering the adjacent
rooms
Note: When commissioning the system, it is necessary to
perform the settings and regulation of the device (PID con-
stants, FI ramp, etc.)
Frequency Inverters
For five-stage control devices, the request for the inlet and outlet
fan speed is set in common. However, for frequency inverters,
the request for the inlet and outlet fan output (0-100%) can
be set separately for each stage (1 to 5) (see the Data Point
Settings – Fans).
Figure 14 – Constant Airflow Control
19
Control units VCS
Operating Modes
e operating mode which will determine the device’s oper-
ating state (Run or Stop) is determined by the priority. Each
operating mode is assigned a priority, i.e. the first option to
control the control unit, to eliminate mutual interference. e
operating modes are prioritized as follows, from the lowest
to highest priority:
nManual control
nExternal control
nLocal HMI-SG controller
nBMS (pending)
nTime schedule
nAdditional operating modes
e priorities and entire control system are shown in the
diagram (Figure 16 ).
Basic Information on VCS
Operating Modes
Operating states
ere are three operating states defined for VCS control units
(Stop, Run, Auto):
Stop – e device is in standstill mode (fans stopped). Impor-
tant safety features like antifreeze protection and moderate
pre-heating of the water heater are retained.
Run – e device is started in accordance with the pre–set
temperature mode and fan speed.
Auto – Control is switched to the next operating mode with
a lower priority. e Auto operating state cannot be set in
the time schedule mode because it is a control type with the
lowest priority.
e operating mode determines which operating state will be
active according to priorities (see Operating Modes).
Operating Modes
e control unit’s operating state (i.e. whether the air-handling
unit is in the Stop or Run state) is determined by one of the
operating modes (manual control, external control, HMI-SG
controller, BMS or time schedule modes). HMI-DM or HMI-TM
controllers affect control in the manual control mode. External
control is performed by single- or two-contact control. BMS
control enables control of the control unit by the higher level
control device (e.g. smart building control systems; Note:
pending). To control air handling systems, the HMI-SG control-
ler is connected to the control unit.
Obrázek 16 – Operating modes
Alarm A
State
Yes
Ne
Stop
Stop,Co1,EC1,...
ManualCo1,EC1,Co2, ...
RUN
Co1,EC1,Co2, ...
HMI-SG (p. 125)
HMI TM, DM
Fans
(stage 1-5)
Comfort/
Economy
Auto
Auto
Auto
Auto
Stop
Passive
Active
Passive
Active
Passive
Active
Passive
External
control
Optimized
start
HMI-SG
controller
BMS
Time
modes
Optimized
start
Temperature
start-up
Night
chilling
Night
turning
Temperature
start-up
Night
chilling
STOP
Night
turning
Additional Operating Modes
If no operating mode is applied and the time schedule mode
is in the Stop state, the air-handling unit can be started from
additional operating modes. e user can use the following
additional operating modes to start the air-handling unit:
nNight chilling
nTemperature start-up
nOptimized start
Additional operating modes can be activated by the HMI-SG
controller in the List of Data Points in the section Settings
– Additional Operating Modes, Functions.
Control Application Starting Algorithm
Air-handling system operation safety is assessed first (fire
detection and operational safety of the air-handling de-
vices). en the operating modes and their priorities are assessed
(Manual, External, HMI-SG controller, BMS and time modes). If no
control mode is currently used, the air-handling unit can, but may
not, be put into one of the additional operating modes depending
on the user's option. All the operating modes and their correlation
are shown in the figure # 10 - "Operating modes".
e current operating mode can be monitored through the HMI
controller in the List of Data Points in the section Monitor –
Current Modes.
When the fans run and the air-handling unit is in operation, two
basic groups of parameters are used to control operation:
nTemperature mode or humidity mode
nFan output (speed)
e fan output or speed can be set directly at levels corresponding
to the air-handling system configuration:
20
Night Chilling
During night chilling, cold outdoor air is used to cool internal
rooms of the buildings, thus excess heat accumulated in build-
ings during the day in summer months is removed. Night chilling
minimizes the use of cooling devices and reduces the energy
demand for temperature control day hours. During night chilling,
the inlet and outlet dampers are fully open and fans run in the
highest output stage. Night chilling start-up is enabled 12 hours
before activation of the selected time schedule.
Activation
When the following conditions are fulfilled simultaneously:
nTVEN > TMIN
nTVEN < TPRO - ∆
nTPRO > TŽÁD + THYS
Termination
If one of the following conditions is fulfilled:
nOnce minimum operating time has elapsed while no time
mode is active (Stop mode)
nTVEN > TPRO - 1
nTPRO <= TŽÁD
TMIN Minimum outdoor temperature;
TVEN Outdoor air temperature;
∆ Outdoor and indoor temperature difference
TŽÁD Required room temperature
THYS Temperature hysteresis
Temperature Start-Up
is feature prevents the building from overheating or overcool-
ing. e energy used to maintain a constant temperature range
and system temperature oscillations are lower than the energy
consumption for overheated or overcooled room control. Air
from the room is re-circulated through the air mixing section
(mixing damper fully open). e fan speed is set to the highest
output stage. During temperature start-up, it is possible to select
whether the inlet and outlet dampers or dampers along with the
outlet fan will be blocked. is can be performed using the HMI
controller, refer to the chapter Additional Operating Mode and
Function Setting Options.
Cooling
Activation
When the following conditions are fulfilled simultaneously:
nTPRO > TS,CH
nOnce the tBL time interval has elapsed
Termination
If the following condition is fulfilled:
nTPRO < TS,CH - THYS
Additional Operating Modes
nSingle-speed motor fans:
>> Stage1
nTwo-speed motor fans:
>> Stage1 / Stage2
nAll five-stage controlled fans:
>> Stage1 / Stage2 /
Stage3 / Stage4 / Stage5
nFor pool units:
>> Stage1 / Stage2 / Stage3
See the chapter Fan Speed Control, see page 16.
Heating
Activation
When the following conditions are fulfilled simultaneously:
nTPRO < TS,O
nOnce the tBL time interval has elapsed
Termination
If the following condition is fulfilled:
nTPRO > TS,O + THYS
TPRO Required room temperature
TS,CH Starting temperature for cooling
TS,O Starting temperature for heating
THYS Temperature hysteresis at the stop
tBL Heating blocking time
tBEH Time remaining to start the time schedule
Optimized Start
is feature is used to ensure the comfortable temperature
to be reached before the time schedule has been activated.
us possible initial temperature non-conformities aer the
time schedule activation are removed. is feature includes the
setting for the room ventilation to have the room temperature
controlled as soon as possible. is is based on air recirculation
within the room along with cooling or heating adjustment. e
mixing damper is fully open. It is possible to select whether the
inlet and outlet dampers will only be blocked or whether the
outlet fan will be blocked as well.
Cooling
Activation
When the following conditions are fulfilled simultaneously:
nTPRO > TS,CH + THYS
nt∆TP < tKOM
Termination
If the following condition is fulfilled:
nTPRO < TS,CH
Heating
Activation
When the following conditions are fulfilled simultaneously:
nTPRO < TS,O - THYS
nt∆TP < tKOM
Termination
If the following condition is fulfilled:
nTPRO > TS,O
TPRO Required room temperature
TS,CH Required temperature set-point for cooling
TS,O Required temperature set-point for heating
THYS Temperature hysteresis
tKOM Pre-set interval before time program start-up
t∆TP Time remaining to the time program start-up
Night Turning Feature
When the supply air temperature sensor is not present, the outlet
air temperature is evaluated. As the temperature is measured in
the outlet, the fans are started at specified time intervals and air
from the room is drawn into the outlet duct. e night turning
feature is used along with the night chilling or temperature start-
up modes. Night turning can be specified by the turning start
time, time remaining to next turning and turning duration time.
Other manuals for VCS
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