Komfovent RHP Pro2 User manual

USER MANUAL EN
RHP Pro2

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CONTENT
1. INTRODUCTION ...........................................................................................................................................................................................................5
1.1. Before turning on the unit ................................................................................................................................................................................5
2. AIR HANDLING UNIT FUNCTIONS......................................................................................................................................................................6
2.1. Ventilation modes ................................................................................................................................................................................................6
2.2. Air ow control......................................................................................................................................................................................................6
2.3. Temperature control............................................................................................................................................................................................7
2.4. Air Quality Control (AQC)...................................................................................................................................................................................7
2.5. Outdoor compensated ventilation (OCV) ...................................................................................................................................................8
2.6. Minimum temperature control function (MTC).........................................................................................................................................8
2.7. Operation on demand (OOD) ..........................................................................................................................................................................8
2.8. Summer night cooling function (SNC) .........................................................................................................................................................9
2.9. Override (OVR).......................................................................................................................................................................................................9
2.10. Filter impurity indication.................................................................................................................................................................................9
2.11. Heat pump.........................................................................................................................................................................................................10
2.12. Protective functions.......................................................................................................................................................................................10
3. OPTIONAL FUNCTIONS.........................................................................................................................................................................................12
3.1. Recirculation (REC)............................................................................................................................................................................................12
3.2. Humidity control function (HUM)................................................................................................................................................................12
3.3. Additional zone control (ZN).........................................................................................................................................................................13
3.4. Combined water heater/cooler....................................................................................................................................................................13
3.5. Control of direct evaporation (DX) devices.............................................................................................................................................. 13
3.6. Pressure auto balance......................................................................................................................................................................................13
3.7. Smoke extraction by-pass..............................................................................................................................................................................14
4. CONTROL AND SETTINGS. CONTROL PANEL C5.1.................................................................................................................................. 15
4.1. Parameter overview..........................................................................................................................................................................................16
4.2. Turning on and selection of ventilation modes .....................................................................................................................................17
4.3. Setting parameters of ventilation modes.................................................................................................................................................18
4.4. Scheduling window and ventilation schedule settings......................................................................................................................19
4.5. Overview window .............................................................................................................................................................................................20
4.6. Functions..............................................................................................................................................................................................................21
4.7. Settings .................................................................................................................................................................................................................24
4.7.1. Air handling unit....................................................................................................................................................................................24
4.7.2. Customization......................................................................................................................................................................................... 25
5. CONTROL AND SETTINGS. COMPUTER ........................................................................................................................................................26
5.1. Modes....................................................................................................................................................................................................................26
5.1.1. Operation modes................................................................................................................................................................................... 27
5.1.2. Flow control modes ..............................................................................................................................................................................28
5.1.3. Temperature control modes ..............................................................................................................................................................28
5.2. Functions..............................................................................................................................................................................................................28
5.2.1. Air quality control (AQC) .....................................................................................................................................................................28
5.2.2. Outdoor compensated ventilation (OCV).....................................................................................................................................29
5.2.3. Minimum temperature control (MTC)............................................................................................................................................29
5.2.4. Summer night cooling (SNC).............................................................................................................................................................29
5.2.5. Override function (OVR)......................................................................................................................................................................30
5.2.6. Operation on demand (OOD)............................................................................................................................................................30
5.2.7. Recirculation control (REC).................................................................................................................................................................30

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5.2.8. Humidity control (HUM)......................................................................................................................................................................31
5.2.9. Additional zone control (ZN).............................................................................................................................................................32
5.3. Alarms/Status......................................................................................................................................................................................................32
5.3.1. Actual alarms...........................................................................................................................................................................................32
5.3.2. Alarm history...........................................................................................................................................................................................33
5.3.3. Operation counters...............................................................................................................................................................................33
5.3.4. Eciency status......................................................................................................................................................................................33
5.3.5. Filter status...............................................................................................................................................................................................34
5.3.6. VAV status .................................................................................................................................................................................................34
5.3.7. Controller status ....................................................................................................................................................................................34
5.4. Scheduling........................................................................................................................................................................................................... 35
5.4.1. Operation program............................................................................................................................................................................... 35
5.4.2. Holidays.....................................................................................................................................................................................................35
5.4.3. Recirculation schedule.........................................................................................................................................................................36
5.5. Settings .................................................................................................................................................................................................................36
5.5.1. Date/time..................................................................................................................................................................................................36
5.5.2. Connectivity.............................................................................................................................................................................................37
5.5.3. User interface .......................................................................................................................................................................................... 37
5.5.4. Log-in password..................................................................................................................................................................................... 37
5.5.5. Restoring factory settings...................................................................................................................................................................38
6. CONTROL VIA A SMARTPHONE ........................................................................................................................................................................ 38
7. PERIODIC MAINTENANCE ...................................................................................................................................................................................40
7.1. Housing.................................................................................................................................................................................................................41
7.2. Filters......................................................................................................................................................................................................................42
7.3. Fans.........................................................................................................................................................................................................................43
7.4. Rotary heat exchanger ....................................................................................................................................................................................43
7.5. Heat pump...........................................................................................................................................................................................................43
7.6. Water heater/cooler..........................................................................................................................................................................................43
7.7. Direct evaporation cooler/heater (DX) ......................................................................................................................................................43
7.8. Electrical heater..................................................................................................................................................................................................44
7.9. Humidier ............................................................................................................................................................................................................44
7.10. Silencers .............................................................................................................................................................................................................44
8. TROUBLESHOOTING...............................................................................................................................................................................................44
ANNEX 1. ROTOR CLEANING INSTRUCTIONS.................................................................................................................................................49

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1. INTRODUCTION
An air handling unit is a device designed to ensure good ventilation in the premises. An air handling unit removes indoor
air containing carbon dioxide, various allergens or dust and replaces it with ltered fresh outdoor air. RHP Pro2 air handling
units are designed for ventilation of medium or large commercial or industrial premises (e.g., stores, oces, hotels, etc.)
where a standard air temperature and humidity must be maintained. These air handling units are not intended for air ows
containing solid particles. As the outside air is usually colder or warmer than the indoor air, an integrated recuperator (heat
exchanger) is used to recover thermal energy from the indoor air and transfer the majority of it to the supplied air. If a heat
exchanger alone is not capable of reaching a desired temperature, the heat pump integrated in the unit and heaters or
coolers can be additionally activated.
• Heat exchangers and heaters (or coolers) are designed to compensate for heat/cool losses dur-
ing ventilation, therefore, we do not recommend using this unit as the main heating/cooling
source. The unit may fail to reach the user-dened supply air temperature when the actual room
temperature signicantly diers from the desired room temperature. This condition results in
inecient operation of the heat exchanger.
• We recommend keeping your air handling unit turned on at all times; when ventilation is not
necessary, switch the unit to the minimum intensity operation (20 %). This will help to ensure
good indoor climatic conditions and will reduce condensation inside the unit that can cause
failure in electronic components.
• RHP Pro2 air handling units are not intended for operation in areas with potentially explosive
atmospheres. Air handling units are not intended for ventilation and dehumidication of wet
premises (pools, saunas, car washes, etc.).
• When the AHU is installed in a room with high humidity level, condensate may form on the walls
of the unit at low outdoor temperatures.
This symbol indicates that this product may not be disposed of with your household waste as specied in the WEEE
Directive (2002/96/EC) and national laws. This product should be handed over to a designated collection point or to an
authorised collection site for recycling electrical and electronic equipment (EEE) waste. Improper handling of this type
of waste could have a negative impact on the environment and human health due to potentially hazardous substances
that are generally associated with electrical and electronic equipment. At the same time, your cooperation in the correct
disposal of this product will contribute to the eective usage of natural resources. For more information about where
you can drop o your waste for further recycling, contact your city authorities, waste management organisations, ap-
proved WEEE scheme or your household waste disposal service.
1.1. Before turning on the unit
Before turning on the unit, make sure that:
• The unit is installed in a designated location, all ducts and wires are connected, and sections are tightly interconnected.
• There are no foreign objects, debris or tools inside the unit.
• All air lters are installed.
• Condensate drainage is connected and siphons are lled with water.
• All doors are closed and/or locked and all protective caps are screwed on.
• Do not operate the unit connected to a temporary power supply as unstable power supply can
damage electronic components.
• The air handling unit shall not be turned on without installed and connected protective earthing.
In case of any doubts, contact your installer or “Komfovent” representative to make sure that the unit is operational.

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2. AIR HANDLING UNIT FUNCTIONS
Operation algorithms and functions of the air handling unit are controlled by an integrated automation system. The air
handling unit operates in a user-selected ventilation mode, using additional functions to adjust fan speed and/or power of
heaters/coolers. Automation system also continuously monitors various parameters to ensure proper operation of individual
protective guards: when these parameters go out of range, error messages are displayed or the unit is stopped.
All RHP Pro2 air-handling units are equipped with an integrated heat pump operating both in heating and cooling modes.
If the unit is supplied without a factory-installed automation system, the company that installed the
automation system shall be responsible for operation of the unit and reliability of protective guards.
2.1. Ventilation modes
The unit operates in one of the available ventilation modes. Air volume for each fan and desired air temperature can be
set individually for each mode. The unit comes with the following preset ventilation modes that may be used immediately
after installation or, if required, after altering ventilation settings:
• COMFORT 1 – maximum ventilation intensity (100%), desired air temperature – 21°C.
• COMFORT 2 – average ventilation intensity (50%), desired air temperature – 21°C.
• ECONOMY 1 – low ventilation intensity (33%), desired air temperature – 20°C.
• ECONOMY 2 – minimum ventilation intensity (20%), desired air temperature – 19°C.
• SPECIAL – maximum ventilation intensity (100%), desired air temperature – 21°C. This ventilation mode may also be used
to block heating/cooling and other functions.
For information on how to select a ventilation mode and change parameters see Chapter “Control and Settings”.
2.2. Air ow control
Fan speed of AHU is adjusted by the selected air ow control method:
• CAV – constant air volume control. Fan speed is adjusted by measuring air ow and comparing it against the set value.
Fan rotates at a speed required to reach the set air volume, regardless of pressure changes. For example, when air lters
get contaminated, fan speed is automatically increased to ensure the same volume of air as during operation with clean
lters. In operating modes the user can set the desired air volume for each fan separately. Air volume is set and measured
in m3/h, m3/s or l/s.
• VAV – variable air volume control mode. This method allows maintaining constant air pressure in ducts and adjusting
fan speed according to pressure changes in the ventilation system. Air pressure in ducts is measured with optional VAV
pressure sensors installed in supply and extract air ducts and connected to B6 and B7 terminals of the main controller
(see “Installation Manual”). The user sets a desired air pressure value for the supplied and extracted air ows separately
in operating modes. Air pressure is set and measured in Pa. For proper activation of this function please see the “VAV
Function Installation Instruction”.
• DCV – direct air volume control mode. This mode is very similar to the CAV mode, but additionally allows adjustment of
fan speed by connecting 0..10 V control signal to terminals B6 and B7 of the main board (see “Installation Manual”). As
the control signal voltage changes, fan speed is adjusted accordingly, i.e. 10V corresponds to the set air volume value,
whereas, 2V corresponds to 20% of the fan power.
• VAV or DCV air ow control method requires additional air duct equipment, therefore, use these
functions only after consulting the installer or other qualied professional.
• For proper operation of a heat pump, a certain amount of air is required (see “Installation Man-
ual”). With VAV or DCV functions, heat pump capacity may be temporary reduced due to insuf-
cient airow.
For information on how to select an air ow control method see Chapter “Control and Settings”.

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2.3. Temperature control
Temperature in the air handling unit is maintained by measuring the actual temperature and comparing it against the
user-dened temperature. Then, depending on whether the supplied air requires heating or cooling, heat exchanger or ad-
ditional heaters/coolers are activated. Available temperature control methods:
• Supply air temperature control – the unit supplies air of user-dened temperature.
• Extract air temperature control – the unit automatically selects the temperature of supplied air to ensure that the
temperature of extracted air is reached and maintained as quickly as possible. Room air temperature is measured by an
integrated exhaust air temperature sensor.
• Room temperature control – the unit automatically selects the temperature of supplied air to ensure that the room
temperature is reached and maintained as quickly as possible; room temperature is measured by an optional sensor
(0..10V signal corresponds to the range of 0..50 °C). Room temperature control function will only be available if none of
the following functions is activated at the same time: AQC, OOD, REC by air quality.
• Balance – supplied air temperature will be maintained to be the same as extracted air temperature, therefore, selecting a
desired temperature in the ventilation mode settings is not possible. Room air temperature is measured by an integrated
exhaust air temperature sensor.
For information on how to select a temperature control method see Chapter “Control and Settings”.
When the heat pump is running and heating/cooling demand is low (especially during transition
periods – spring or autumn), supply temperature variations may occur. In this case, to stabilize the
supply temperature, we recommend selecting exhaust air or indoor temperature control.
2.4. Air Quality Control (AQC)
Air quality control function is intended for adjusting ventilation intensity according to the indoor air quality. When indoor
air quality drops below the user-dened limit, ventilation intensity is gradually increased until the air quality improves. This
function requires an air quality sensor installed inside the extraction air duct or inside the room (see “Installation Manual”).
Air quality may be controlled by one of the following sensors (type of the sensor is selected during ordering or set in the
remote control menu item “Settings”):
• Carbon dioxide CO2.
• Air quality VOCq, where maximum signal corresponds to good air quality.
• Air quality VOCp, where minimum signal corresponds to good air quality.
• Relative humidity RH.
• Temperature TMP.
AQC function is blocked if any of the following functions are activated at the same time: SNC, MTC, REC, OCV.
For information on how to activate this function and set a maintained air quality value see Chapter “Control and Settings”.

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2.5. Outdoor compensated ventilation (OCV)
This function adjusts ventilation intensity according to the outdoor temperature. This saves the energy needed for air
heating or cooling. The user sets four outdoor temperatures (two for winter and two for summer) for this function to operate.
As long as the outdoor temperature is outside the summer or winter temperature limits, the unit keeps running in a currently
activated ventilation mode. Ventilation intensity is reduced proportionally to the rising (summer temperature range) or de-
creasing (winter temperature range) outdoor temperature.
Ventilation intensity, %
Winter
compensation
stop
Winter
compensation
start
Summer
compensation
start
Summer
compensation
stop
Air ow
setting
20
Outdoor temperature, °C
Fig. 1. OCV function operation
OCV function is blocked if SNC or REC functions are activated at the same time. This function also has priority over AQC
function.
For information on how to activate this function and set temperature ranges see Chapter “Control and Settings”.
2.6. Minimum temperature control function (MTC)
Minimum temperature control function forcibly reduces the user-dened ventilation intensity when the set minimum
temperature cannot be reached. Fan speed is gradually reduced when the outdoor temperature drops below + 5 ° and the
power of the heat exchanger and heater is insucient to reach the minimum temperature. If this function runs for a long
time, ventilation intensity is reduced to 20%.
During summer, the minimum temperature control function limits power of coolers when, in case of cooling demand,
supplied air temperature is below the minimum set temperature value.
For information on how to activate this function and set a minimum temperature value see Chapter “Control and Set-
tings”.
2.7. Operation on demand (OOD)
This function turns on the AHU as soon as the indoor air quality decreases. In this way, the air handling unit will only run
when ventilation is required and will remain stopped when the air quality is good. As the air quality decreases and reaches
the user-dened critical limit, the air handling unit starts and runs in the last activated operating mode. If the air quality
improves within 30 minutes (pollution drops 10% below the critical limit), the unit stops. If the air quality remains poor, the
unit keeps operating.
This function requires an additional air quality sensor installed inside the room (see “Installation Manual”). The same
sensor is also used for AQC function.
Sensor type is selected during ordering. Later, the sensor type may be changed in the remote controller menu “Settings”.
For information on how to activate this function and set a critical air quality value see Chapter “Control and Settings”.

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2.8. Summer night cooling function (SNC)
Summer night cooling function uses the night’s cool air to ventilate the premises during summer. This function removes
excess heat accumulated during the day and lls the building with cooler outdoor air.
Function runs at night (from 00:00 a.m. to 06:00 a.m.) when the outdoor air is cooler than the indoor air and the indoor
temperature is higher than the user-dened limit (i.e. ventilation is required). When this function is activated, the ventilation
intensity is increased to the maximum and the outdoor air is supplied to the premises (all cooling devices are switched o,
heat exchanger is stopped). The user may also set the room temperature at which the function will be stopped.
Summer night cooling function has priority over ACV and AQC functions.
For information on how to activate this function and set ON/OFF temperatures see Chapter “Control and Settings”.
2.9. Override (OVR)
Override function is activated by closing designated contacts in the controller board, i.e. by connecting a switch, cooker
hood or a motion sensor (see “Installation Manual”). This function ignores current ventilation mode and switches to the pre-
selected mode or stops it. In the function setup screen the user can select any ventilation mode, weekly operation schedule
or turning o of the unit. Additionally, the user may also specify conditions when the override function should run:
• All the time – function is activated any time by closing contacts, regardless of whether the unit is operating or stopped.
• When running – function is activated by closing contacts when the unit is operating. When the unit is stopped with a
remote controller or by a weekly schedule, the function cannot be activated by closing contacts.
• When stopped – function is activated by closing contacts when the unit is stopped. If the unit is already running in any
ventilation mode, the function cannot be activated by closing contacts.
This function runs as long as contacts are closed. When the contacts are open, the unit returns to the previous ventilation
mode or stops, if it was stopped before activating the function.
2.10. Filter impurity indication
The air handling unit has separate pressure sensors for measuring dierential pressure upstream and downstream the
lters. The initial pressure drop of clean lters is pre-programmed in the factory according to the type of lters used. This
value is used to calculate the pressure value for lter replacement; lter contamination level is displayed as a percentage.
In case lters from another manufacturer or lters of other ltration class are used instead of factory-tted lters, calibra-
tion of clean lters shall be performed before using the air handling unit.
Filter calibration is described in chapter “Control and Settings”.
For information on how to replace contaminated lters see Chapter “Periodic Maintenance”.

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2.11. Heat pump
All RHP Pro2 air-handling units are equipped with an integrated heat pump operating both in heating and cooling modes.
A heat pump unit consists of a piping system containing refrigerant, compressor (or several), two radiators (condenser and
evaporator) and separate control electronics (for more information on heat pump components, see “Installation Manual”).
Heat pump is activated automatically when a rotary heat exchanger is unable to reach desired temperature; and is switched
o as soon as desired temperature is reached.
A certain airow is required to ensure proper operation of a heat pump (see “Installation Manual” or technical data sheet
of your unit), i. e. to ensure ecient heat exchange and maintain refrigerant pressure within limits. When airow drops below
a minimum limit, a heat pump capacity is temporarily reduced and resumed only when airow increases. If heating/cooling
demand increases when the heat pump capacity is limited, additional heaters/coolers are activated1.
When the heat pump is running, we recommend operating air handling units with the smallest pos-
sible air volume dierence between the supply and extract airows. In case of high ow imbalances
(>20%), capacity and eciency of the heat pump decreases, therefore the compressor operates at a
critical refrigerant pressure limit. This results in reduced operating life and increased probability of
failure.
To reduce energy consumption of the air-handling unit, the heat pump is not operating when outdoor air temperature
is between 15°C and 20°C, as, in this case, the rotary heat exchanger is usually capable of reaching desired air temperature.
When the heat pump is blocked due to outdoor temperature limits, a heat pump operation prohibition icon is displayed in
the control panel (see chapter “Control panel C5.1”).
During wintertime, heat pump evaporator will naturally ice-up and periodically go into an automatic defrost cycle (see
chapter “Protective Functions”).
2.12. Protective functions
The air handling unit is equipped with several protective functions that aect the operation of the unit. The operator is
not allowed to change these settings values. These functions protect the unit and its components against damage as well as
provide protection for the building and people when the ventilation system is exposed to dangerous circumstances.
External re alarm function stops the air handling unit as soon as a signal from the building’s re alarm system or
smoke detectors is received. This immediately stops ventilation and fresh air from entering re zones to prevent re from
spreading. Fire alarm message is displayed on a control panel or other device used for controlling the air handling unit. In
case of false re alarm, for example, due to re protection system inspections, the air handling unit will need to be restarted
after turning o the signal and clearing the re alarm message. If such tests are run periodically, authorized service person
may program the air handling unit to start in the previous mode after turning o the re alarm.
Connection of the building’s re protection system signal is described in the “Installation Manual”.
Internal re alarm function stops the air handling unit when air temperature increase is detected inside the unit. This
can happen, for example, when hot smoke enters the duct system from re zones both inside and outside the building. This
function prevents smoke from spreading inside the premises and warns about a potential re hazard if the building’s re
protection system has not yet responded. If the air handling unit is intended for operation in high temperature premises (for
example, in drying chambers, bakeries, etc.), this function may be disabled. This can be done by authorized service person.
Electric heater overheat protection consists of several dierent control algorithms. Integrated thermostats disconnect
electric heater’s power supply if its temperature reaches a critical limit (e.g., in case of heater’s control electronics failure).
Every electric heater has 2 thermostats:
• Automatic thermostat 70°C which prevents heating tubes from overheating when the heater is running at high power
and low airow speed. Protection is restored as soon as the heater cools down and thermostat temperature drops. Heat-
er operation is restored automatically.
• Manual reset thermostat 100°C. This thermostat, in case of overheating, completely disconnects the heater‘s power sup-
ply to protect control electronics and adjacent plastic components. Protection may be reset by pressing the RESET but-
ton inside the unit (see Chapter “Troubleshooting“).
1 Depends on conguration.

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Eliminate the cause of overheating before restoring the manual reset thermostat of 100°C.
Fan cooling of heating/cooling devices. If the air-handling unit is stopped while heat pump, electric heater or direct
evaporation (DX) unit is still running, fan cooling is initiated. Fans run at xed speed until heater tubes cool down or heat
pump’s / DX unit’s refrigerant pressures stabilize. Blowing time depends on the accumulated heat/cold and ventilation in-
tensity and can take up to 15 minutes.
Water heater frost protection function measures water temperature returning from the heater coil. At low outdoor
temperatures, when there’s a risk of water freezing, a 3-way water mixing valve is opened and hot water pump is started to
prevent temperature of water inside the heater from dropping. If temperature of water returning from the heater coil still
falls below the critical limit, the unit is stopped and outdoor air dampers are closed to prevent cold air from entering the unit.
When operating air handling unit in the temperatures lower than 0 °C, it is necessary to use water-
glycol mixture as a heat carrier or to maintain a return water temperature of at least 25 °C.
Water ow sensor may also be used as an additional frost protection (see Chapter “Water Flow Monitoring Function”).
Defrosting heat pump evaporator
During winter operation, when the heat pump is in heating mode, condensate on the evaporator starts freezing and
forms frost. Large ice deposits block airow in the evaporator and may damage the heat pump. Therefore, the evaporator is
automatically defrosted during winter use.
When the outdoor temperature drops below zero, the heat pump automation system starts constantly monitoring
pressure dierence upstream and downstream the evaporator heat exchanger. When condensate accumulates in heat ex-
changer plates and ice starts to form, pressure increases and defrosting actions are initiated. During the defrost cycle, part
of the hot refrigerant gas is directed from the compressor to the evaporator to melt forming ice crystals, therefore supply air
temperature temporarily drops. Additional heaters are automatically switched on to compensate for this change. As soon as
frost melts and pressure decreases, all the power of the heat pump is redirected to the heating process.

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3. OPTIONAL FUNCTIONS
3.1. Recirculation (REC)
Extracted air recirculation function is available in units with recirculation sections. Recirculation section is intended for
mixing extracted and supplied air for heating or cooling of air ows in order to reduce energy consumption of heaters/coolers.
The recirculation damper control method is selected during ordering of the unit. Available recirculation damper control
methods:
• By air quality
When the indoor air quality is good, a recirculation damper is opened and outdoor dampers are closed. In this way, the
extracted air is returned to the supply air ow. When air quality is decreasing, the recirculation valve starts gradually closing
and more fresh air is supplied from outside. The user may also set minimum fresh air volume to be supplied even when the
indoor air quality is good.
• By schedule
The user sets a weekly schedule with times and percentage for opening the recirculation damper.
• By outdoor temperature
The user sets outdoor temperature limits at which the recirculation damper will be opened proportionally:
Recirculated air, %
Winter
recirculation
stop
Winter
recirculation
start
Summer
recirculation
start
Summer
recirculation
stop
0
100
Outdoor temperature, °C
Fig. 2. REC function operation
• Control by external signal
Recirculation damper position is changed by connecting an external device (switch, motion sensor, thermostat) to the
C5controller board, which opens or closes contacts (see “Installation Manual”). The user species two recirculation damper
positions (as a percentage): for open and for closed contact.
The volume of supplied and extracted air for all recirculation control methods is determined by an activated ventilation
mode (see “Ventilation modes”).
For information on how to activate this function and alter settings see Chapter “Control and Settings”.
3.2. Humidity control function (HUM)
Humidity control function is intended for maintaining the user-dened air humidity level. This function controls air hu-
midiers or dehumidiers according to the user-dened humidity level and also can perform dehumidication using inte-
grated heating/cooling devices. This function requires one or two humidity sensors connected to the C5 controller board
(see “Installation Manual”).
This function can be used to maintain:
• Supply air humidity level – when a duct-mounted supply air humidity sensor is used.
• Indoor humidity level – when two humidity sensors are used. Indoor air (or extract air) sensor measures the desired
humidity level in the premises, whereas the supplied air humidity is limited according to the readings of a duct-mounted
humidity sensor.
Settings for humidity control function and humidier/dehumidier control type is selected during ordering of the air
handling unit. Later, these settings may only be changed by a service representative. Humidity control function has priority
over AQC function. For information on how set a desired humidity value see Chapter “Control and Settings”.

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3.3. Additional zone control (ZN)
This function allows controlling up to three dierent temperature zones with one air handling unit. Temperature of the
main zone is maintained by integrated heaters/coolers. Temperature in other zones is maintained by connected additional
zone modules, which are used to control duct-mounted heating/cooling devices. Every additional temperature zone will
also have a separate temperature sensor and a separate setting for the desired temperature that the user will be able to set
with the control panel.
An additional zone module may also control heaters/coolers installed in the same supply air ow, when more heating/
cooling power stages are required or a pre-heater is connected upstream the air handling unit.
For more information about this function and connection of heating/cooling devices see “Additional zone control C5”
Instruction Manual.
For information on how to activate this function and set a desired temperature value see Chapter “Control and Settings”.
3.4. Combined water heater/cooler
It is possible to use only one water heater and one piping unit (mixing valve, valve actuator, circulation pump) both for
heating and cooling. For the function to work properly, an additional external signal (e.g., from a thermostat) is required to
switch between heating and cooling modes (see “Installation Manual”).
This feature is pre-ordered and congured at the factory. Later, settings of this function may only be changed by a service
representative.
3.5. Control of direct evaporation (DX) devices
When the unit is ordered with an additional direct evaporation (DX) coil, a feature for controlling an external DX unit is
enabled. There are several dierent ways to control the DX unit:
• Modulated control – DX device is controlled by 0..10 V signal.
• Stepping control – START/STOP type DX devices are used.
This feature is pre-ordered and congured at the factory. Later, settings of this function may only be changed by a service
representative.
3.6. Pressure auto balance
When this function is ordered for AHU, extract air damper (air extracted from the premises) is mounted additionally
and pressure sensor is installed inside of the C5 controller board. Function maintains constant pressure dierence between
supply and extract airows inside of AHU, by regulating damper position. Function ensures that extracted air is not returned
to the supply ow through heat exchanger and increases purge sector (if installed on AHU with rotary heat exchanger) ef-
ciency.
In cases, when AHU cannot reach set extract air ow (for example because of incorrectly designed
or poorly installed duct system), it is possible, that airow will be reduced during operation of pres-
sure auto balance function and too low airow alarm will be indicated. It is recommended to reduce
airow set point if such situation will appear.
This function is active constantly and may only be disabled or changed by a service representative.

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3.7. Smoke extraction by-pass
When the re alarm is triggered, an additional smoke by-pass damper is opened (see "Installation manual"). In this way,
smoke and other gases generated by re by-passes AHU lters, heat exchanger and enters directly into the extract air fan,
which exhaust it to the outside. During function operation, the thermal protection of the fans is disconnected to prevent
them from stopping due to the high temperatures. The function is started and runs as long as the re alarm is active (see
"Installation manual") – other functions and ventilation modes are ignored at that time.
When selecting this function, the following options of fan control during re can be selected:
• Default – the unit is completely stopped in the event of a re and the smoke extraction function is not used.
• Force exhaust fan – the supply air fan is stopped and the exhaust fan is started at full power.
• Force both fans – both AHU fans are started at full power.
The smoke bypass function is selected in the VERSO selection software when ordering the unit.

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4. CONTROL AND SETTINGS. CONTROL PANEL C5.11
Air handling unit may be conveniently controlled via the following ways:
• Control panel.
• Mobile app.
• Web browser.
C5.1 panel has a colour touchscreen. If the unit is connected to the mains, the control panel will display the home screen
or screen saver that you can switch o with a single tap.
ECONOMY 1
21,9 °C
21,3 °C
Temperature
16:30
This control panel is designed for indication and changing of various functions and settings of the unit. Touch-sensitive
display reacts to soft taps, therefore, do not use any sharp tools (screwdrivers or pens), also do not apply excessive force as
it may damage the display.
Operation modes
COMFORT 1
COMFORT 2
ECONOMY 1
ECONOMY 1
SPECIAL
OFF
Back
Change
settings
Activate mode
or function
Selection of ventilation
modes
Setpoint
21,0
5,0 °C
40,0 °C
Parameter to be changed
Maximum possible value
Minimum possible value
Current setting
Increase
Decrease
Parameter modication
window
CancelConrm
Functions Settings
Overview Scheduling
Menu
Menu window
Main screen
ECONOMY 1
21,9 °C
21,3 °C
Temperature
16:30
Selection of
ventilation modes
Time Display of function/mode
operation
Main parameter
overview window
Switching of
overview windows
Menu
1 Sold separately.

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Explanation of the displayed symbols
Supply air
temperature
Extract air
temperature
Supply air volume
Extract air volume
Supply air humidity
Extract air humidity
Extract (room)
air quality
Fan operation
Air ow increasing
by activated function
(see chapter Functions)
Air ow decreasing
by activated function
(see chapter Functions)
Energy recovery
operation
Air heater operation
Air cooler operation
Air humidier operation
Summer night cooling
mode
Weekly operation mode
Holiday operation mode
„Override“ mode
Alarm signal
Heat pump operating
prohibition1
4.1. Parameter overview
The following parameters are displayed in the main window and parameter overview windows: air ow, temperatures, air
quality sensor data and energy recovery. Use arrows on the sides of the main screen to browse across parameter windows.
ECONOMY 1
21,9 °C
21,3 °C
Temperature
16:30
90%
18 kW
ECONOMY 1
16:30
Energy saving
ECONOMY 1
60% RH
800 ppm
Air quality
16:30
ECONOMY 1
12500 m³/h
13100 m³/h
Air flow
16:30
For more parameters see “Detailed information” screen (Menu →Overview →Detailed information).
Alarms
Operation counters
Detailed information
Overview
Efficiency status
Detailed information
350 m3/h
1 / 3
21,9 °C
Extract temperature
22,1 °C
Outdoor temperature
16,6 °C
Water temperature
25,3 °C
Supply temperature
Supply flow
Functions Settings
Scheduling
Menu
Overview
1
1 Under certain conditions, the heat pump cannot operate due to low (high) outdoor air temperature. For more details, see the section“Heat pump”.

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4.2. Turning on and selection of ventilation modes
To start an air handling unit or to change a ventilation mode:
1. Press the ventilation mode selection button.
2. Conrm the message if you want to run the device in the previous mode (if the unit is stopped).
3. Cancel the message if you want to select another operating mode or you do not remember which mode was activated
previously.
4. Select a desired ventilation mode.
5. Press the return key and conrm the message that appears.
Oro kokybė
OFF
--,- °C
--,- °C
Temperature
16:30
OFF
21,9 °C
21,3 °C
Temperature
16:30
ON?
Operation modes
COMFORT 1
COMFORT 2
ECONOMY 1
ECONOMY 2
SPECIAL
OFF
Operation modes
COMFORT 1
COMFORT 2
ECONOMY 1
ECONOMY 2
SPECIAL
OFF
Operation modes
COMFORT 1
COMFORT 2
ECONOMY 1
ECONOMY 2
SPECIAL
OFF
Change
operation
mode?
ECONOMY 2
21,9 °C
21,3 °C
Temperature
16:30
During the rst minute of starting the unit, the unit automation checks the settings, automation components and opens
air dampers. Later, a signal is released to fans and a heat exchanger, and the unit starts operating at a selected ventilation
mode.

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4.3. Setting parameters of ventilation modes
To change the ventilation mode settings:
1. Press the ventilation mode selection button.
2. Press “Change settings” symbol next to the parameter to be changed.
3. Press a parameter you want to change.
4. Use the arrows to select a desired value and press to conrm.
5. Press the return icon at the top of the screen to return to the home screen.
OFF
--,- °C
--,- °C
Temperature
16:30 Operation modes
COMFORT 1
COMFORT 2
ECONOMY 1
ECONOMY 2
SPECIAL
OFF Reset settings
ECONOMY 2
1250 m3/h
1250 m3/h
Setpoint
20 °C
Supply flow
Extract flow
Supply flow
1300 m3/h
1250
600 m3/h
Setpoint
40,0 °C
21,0
5,0 °C
SPECIAL ventilation mode may also be used to disable heating/cooling and other functions. This saves energy when
temperature and other ventilation parameters are less important (for example, at night, when the building is empty, when
cooling devices can be turned o and will not be activated even when temperature exceeds the desired temperature during
the day).
Reset settings
SPECIAL
680 m3/h
21 °C
Setpoint
On
Heating
On
Cooling
On
Humidifying
Supply flow

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4.4. Scheduling window and ventilation schedule settings
In menu item “Scheduling” you can create your own ventilation schedules so that the ventila-
tion intensity or temperature settings change automatically.
• Operation program
You can set up to twenty operating programs. You can assign a desired operating mode, day
of the week and time interval for every program.
To create a weekly ventilation schedule:
1. Press “Sheduling” key in the menu window.
2. Press “Operation program”.
3. Press “Add new program” key at the bottom.
4. Select a desired ventilation mode. If you don’t want your unit to run at a specied time, select
standby mode1.
5. Select days of the week for the program to run.
6. Set the start and end time for the program.
7. Add additional programs, if needed (up to 20 programs).
8. Once the schedule is created, activate it by checking “Enable” box and returning to the main window.
Functions Settings
Overview
Menu Scheduling
Operation program
Holidays
Recirculation schedule
Operation program
Add new program
Enable
Program 1
Program 2
Operation mode
COMFORT 1
Weekdays
Mo/Tu/We/Th/Fr/Sa/Su
Start time
00:00
Stop time
24:00
Delete program
Operation mode
COMFORT 1
COMFORT 2
STANDBY
Start time
18 : 30
Weekdays
Tu
Th
Sa
Mo
We
Fr
Su
Scheduling
• Holidays
Here you can select a holiday program, set dates for the unit to run in a selected mode or to be stopped (e.g., stopping
the air handling unit in the oce during Christmas holidays).
Holidays
Holidays 1
Add new holiday
Holidays 2
Operation mode
STANDBY
From
12/14
Till
12/26
Delete holiday
1 Standby mode is optional. The device will only operate at a set time. The unit will automatically stop during unspecied periods.
Scheduling
Operation program
Holidays
Recirculation schedule

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• Recirculation schedule1
When the unit is equipped with a recirculation section, recirculation damper can be controlled according to a user-
created weekly schedule (maximum of 5 dierent schedules) with a user-dened day of the week, hours and recirculation
level %.
Recirculation schedule
Schedule 1
Add new schedule
Schedule 1
Level
70 %
Weekdays
Mo/Tu/We/Th/Fr/Sa/Su
Start time
00:00
Stop time
24:00
Delete schedule
4.5. Overview window
“Overview” screen shows information about the status of the air handling unit and its devices.
Functions Settings
Overview
Menu
Alarms
Operation counters
Filter status
Overview
Efficiency status
Detailed information
Scheduling
• Alarms
This menu item displays relevant messages with identication codes. “A” at the end of the
code means that the error is critical and the unit will be stopped until the fault is rectied. “B”
at the end of the code means that the message is informational and the unit will keep running.
Once the cause is resolved, delete relevant errors and messages by pressing “Reset”. For more
information see Chapter 8. “Troubleshooting”.
Press “History” button to show the last 50 messages along with the date and time they were
displayed.
• Operation counters
These meters show operating time of individual devices, amount
of energy returned and consumed. To reset a meter, press an arrow
next to a desired parameter.
1 Displayed only when this function is pre-ordered.
21A
Electric heater overheating
3B
VAV calibration fail
Alarms
Delete History
Operation counters
Air heater
121 kWh
Supply fan
873 h
Exhaust fan
875 h
Recovered energy
1440 kWh
Operation counters
Air heater
121 kWh
Supply fan
873 h
Exhaust fan
875 h
Recovered energy
1440 kWh
Reset air heater
operation counter?