Komfovent RHP Standard User manual

RHP Standard
USER
MANUAL
EN

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RHP STANDARD_guide_21-03
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) ...................................................................................................................................................7
2.6. Minimum temperature control function (MTC).........................................................................................................................................8
2.7. Operation on demand (OOD) ..........................................................................................................................................................................8
2.8. Summer night cooling function (SNC) .........................................................................................................................................................8
2.9. Override (OVR).......................................................................................................................................................................................................8
2.10. Heat pump............................................................................................................................................................................................................9
2.11. Protective functions..........................................................................................................................................................................................9
3. OPTIONAL FUNCTIONS.........................................................................................................................................................................................10
3.1. Humidity control function (HUM)................................................................................................................................................................10
3.2. Additional zone control (ZN)......................................................................................................................................................................... 11
3.3. Combined water heater/cooler....................................................................................................................................................................11
3.4. Control of direct evaporation (DX) devices..............................................................................................................................................11
3.5. Water ow monitoring function.................................................................................................................................................................. 11
4. CONTROL AND SETTINGS. CONTROL PANEL C5.1..................................................................................................................................12
4.1. Parameter overview..........................................................................................................................................................................................13
4.2. Turning on and selection of ventilation modes .....................................................................................................................................14
4.3. Setting parameters of ventilation modes.................................................................................................................................................15
4.4. Scheduling window and ventilation schedule settings......................................................................................................................16
4.5. Overview window.............................................................................................................................................................................................17
4.6. Functions..............................................................................................................................................................................................................18
4.7. Settings .................................................................................................................................................................................................................20
4.7.1. Air handling unit....................................................................................................................................................................................20
4.7.2. Customization.........................................................................................................................................................................................21
5. CONTROL AND SETTINGS. COMPUTER ........................................................................................................................................................22
5.1. Modes....................................................................................................................................................................................................................22
5.1.1. Operation modes................................................................................................................................................................................... 23
5.1.2. Flow control modes ..............................................................................................................................................................................24
5.1.3. Temperature control modes ..............................................................................................................................................................24
5.2. Functions..............................................................................................................................................................................................................24
5.2.1. Air quality control (AQC) ..................................................................................................................................................................... 24
5.2.2. Outdoor compensated ventilation (OCV)..................................................................................................................................... 25
5.2.3. Minimum temperature control (MTC)............................................................................................................................................25
5.2.4. Summer night cooling (SNC).............................................................................................................................................................25
5.2.5. Override function (OVR)......................................................................................................................................................................26
5.2.6. Operation on demand (OOD)............................................................................................................................................................26
5.2.7. Humidity control (HUM)......................................................................................................................................................................26
5.2.8. Additional zone control (ZN) ............................................................................................................................................................. 27
5.3. Alarms/Status......................................................................................................................................................................................................27
5.3.1. Actual alarms...........................................................................................................................................................................................27

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5.3.2. Alarm history...........................................................................................................................................................................................28
5.3.3. Operation counters...............................................................................................................................................................................28
5.3.4. Eciency status......................................................................................................................................................................................28
5.3.5. VAV status .................................................................................................................................................................................................28
5.3.6. Controller status ....................................................................................................................................................................................29
5.4. Scheduling...........................................................................................................................................................................................................29
5.4.1. Operation program...............................................................................................................................................................................29
5.4.2. Holidays.....................................................................................................................................................................................................30
5.5. Settings .................................................................................................................................................................................................................30
5.5.1. Date/time..................................................................................................................................................................................................30
5.5.2. Connectivity.............................................................................................................................................................................................31
5.5.3. User interface .......................................................................................................................................................................................... 31
5.5.4. Log-in password.....................................................................................................................................................................................31
5.5.5. Restoring factory settings...................................................................................................................................................................32
6. CONTROL VIA A SMARTPHONE........................................................................................................................................................................ 32
7. PERIODIC MAINTENANCE ...................................................................................................................................................................................34
7.1. Housing.................................................................................................................................................................................................................35
7.2. Filters......................................................................................................................................................................................................................35
7.3. Fans.........................................................................................................................................................................................................................36
7.4. Rotary heat exchanger ....................................................................................................................................................................................36
7.5. Heat pump...........................................................................................................................................................................................................37
7.6. Water heater/cooler..........................................................................................................................................................................................37
7.7. Direct evaporation cooler/heater (DX) ......................................................................................................................................................37
7.8. Electrical heater..................................................................................................................................................................................................37
8. TROUBLESHOOTING...............................................................................................................................................................................................38
ANNEX 1. Filter inspection and replacement .......................................................................................................................................................43

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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 in-
door air containing carbon dioxide, various allergens or dust and replaces it with ltered fresh outdoor air. RHP Standard air
handling units are intended for ventilation of medium-sized spaces (eg. single family houses, oces, etc.), having operating
ambient temperature and relative humidity. As standard, the unit is designed for indoor placement. 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 the heat of the recuperator is not sucient to reach the user-set temperature, the heat pump integrated
in the unit is switched on. In case of insucient heating/cooling capacity, additional heaters or coolers may be activated.1
• 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 Standard air handling units are not intended for operation in areas with potentially explo-
sive 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.
1 Depends on the unit conguration.

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RHP STANDARD_guide_21-03
EN
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 Standard air-handling units are equipped with an integrated heat pump operating both in heating and cooling
modes.
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 operation may be temporarily blocked due to re-
duced 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.
• 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, OCV.
For information on how to activate this function and set a maintained air quality value see Chapter “Control and Settings”.
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 tempera-
tures (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 decreasing (winter temperature range) outdoor
temperature.
OCV function is blocked if SNC functions are activated at
the same time. This function also has priority over AQC func-
tion.
For information on how to activate this function and set
temperature ranges see Chapter “Control and Settings”.
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

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EN
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”.
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.

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2.10. Heat pump
All RHP Standard 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, 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 temporarily stops. Operation is resumed only when airow increases. If heating/cooling de-
mand increases when the heat pump is switched o, 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 low airow or 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”).
2.11. 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. Integrated electric or auxiliary heaters are 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.
3. OPTIONAL FUNCTIONS
3.1. 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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3.2. 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 modules1, 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”.
3.3. 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.
3.4. 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.
3.5.Water ow monitoring function
Water ow monitoring function is intended for additional protection of a water heater coil. Flow sensor monitors water
ow and emits a signal as soon as it slows down to a critical limit or stops completely. Then the air handling unit is stopped
and the control panel displays an error message.
Water ow can decrease for a variety of reasons, for example, faulty water pump or jammed valve; decreased water ow
is extremely dangerous at low outdoor temperatures as water could freeze and damage the heat exchanger. If this function
is ordered in advance, the air handling unit is equipped with a water ow sensor and a 3-way valve for installation thereof.
For more information please see the “Water Flow Monitoring Function Manual”.
1 Sold separately.

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4. CONTROL AND SETTINGS. CONTROL PANEL C5.1
Air handling unit may be conveniently controlled via the following ways:
• Control panel.
• Mobile app.
• Web browser.
Air handling unit is equipped with a C5.1 control panel. 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

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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 Under certain conditions, the heat pump cannot operate due to low (high) outdoor air temperature or due to low air ow of the air handling unit. For
more details, see the section “Heat pump”.

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EN
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
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

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4.5. Overview window
“Overview” screen shows information about the status of the air
handling unit and its devices.
• 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.
• Eciency status
Heat exchanger parameters are displayed in real-time.
• Detailed information
This menu item displays readings of all sensors installed in the unit as well as information on
operation of individual devices of the AHU and other detailed data.
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?
Functions Settings
Overview
Menu
Alarms
Operation counters
Detailed information
Overview
Efficiency status
Scheduling
Efficiency status
83%
Energy saving
90%
Energy recovery
4,1 kW
Heat exchanger efficiency
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
Detailed information

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4.6. Functions
In menu item “Functions” you can activate or alter all functions of the unit. Press the function name or an arrow to display
the function settings.
Functions Settings
Overview
Menu Functions
1 / 2
Air quality control
Operation on demand
Outdoor compensated
ventilation
Summer night cooling
Minimum tempera-
ture control
Functions
2 / 2
Override function
Humidity control
1st additional zone
control
2nd additional zone
control
Scheduling
Function status is indicated in a box next to the function name:
Blank box: function is disabled.
Blue box: function is working.
Grey box: function is activated but not working.
In the settings of each function you can activate the function and alter operating conditions.
• Air quality control (AQC)
Selecting an air quality limit up to which the air handling unit will run during the activated
mode and above which the ventilation intensity will be automatically increased. Air quality limit
is set for two dierent ventilation modes during which the function will be used and the desired
value will change automatically as the mode changes. If the unit operates in a dierent ventilation
mode than the one set, air quality control function will be disabled automatically.
• Operation on demand (OOD)
Setting a critical air quality sensor value. The unit starts as soon as this value is exceeded.
• Outdoor compensated ventilation (OCV)
Setting winter and summer outdoor temperature limits for reducing ventilation intensity. When
the outdoor temperature is within the range of “Winter compensation start” and “Summer com-
pensation start”, the unit operates in a selected ventilation mode.
Reset settings
Enable
Setpoint 1
1000 ppm
Setpoint 2
880 ppm
Mode 1
COMFORT 1
Mode 2
COMFORT 2
Air quality control
Reset settings
Enable
Setpoint
1000 ppm
Operation on demand
Outdoor compensated...
Reset settings
Enable
Winter stop
-15 °C
Summer start
25 °C
Winter start
5 °C
Summer stop
35 °C

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Reset settings
Enable
Start when indoor
25 °C
Stop when indoor
20 °C
Summer night cooling
Reset settings
Enable
Setpoint
15 °C
Minimum temperature ...
• Summer night cooling (SNC)
Setting two indoor temperatures for the function to start running and stop.
• Minimum temperature control (MTC)
Setting a minimum desired supply air temperature.
• Additional zone control (ZN)1
In this window you can set a desired supply air temperature for an individual ventilation zone.
1 This function only runs when optional additional zone modules are connected.
• Override function (OVR)
Selecting conditions for activating the function (all the time, only when the unit is running,
only when the unit is stopped) and specifying ventilation mode for the unit to run when the
function starts. If the “Standby” ventilation mode is selected, the unit will be stopped.
Reset settings
Enable
Override
If on
Operation modes
ECONOMY 1
Override function
Reset settings
Enable
Setpoint 1
55% RH
Mode 1
COMFORT 1
Setpoint 2
30% RH
Mode 2
ECONOMY 2
Humidity control
• Humidity control (HUM)
Setting a desired relative humidity level. Humidity level is set for two dierent ventilation
modes during which this function will be used and the desired value will change automatically as
the mode changes. If the unit operates in a dierent ventilation mode than the one set, humidity
control function is disabled automatically.
Reset settings
Enable
Setpoint
22.0 °C
1st additional zone c...

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4.7. Settings
All settings are divided into two groups, covering the main settings of the air handling unit and the user interface.
Air handling unit
Personalization
Settings
Reset settings
Air handling unit
Temperature control
Flow control
Air quality
Time/Date
Connectivity
Personalization
Language
English
Flow units
m3/h
Screen saver
On
Panel lock
Off
Touch sound
Click
4.7.1. Air handling unit
• Temperature control
The user can select a desired temperature control
method (see Chapter “Temperature Control”). The user-set
temperature will be maintained during ventilation modes
according to the selected control method.
Temperature control
Supply
Extract
Room
Balance
• Flow control
The user can select a desired air ow control method
(see Chapter “Air Flow Control”).
Flow control
CAV
VAV Double
DCV
• Air quality
Selected air quality sensor type is used in AQC, OOD
functions.
Sensor type
CO2
VOCq
VOCp
RH
TMP
• Time/data
Time and date settings are used for ventilation by weekly
or holiday schedules.
Time/Date
Time
09:40
Day/Month
25/05
Year
2019
Daylight saving time
On
Enable
Daylight saving time
• Connectivity
Parameters for connecting the air handling unit to a
computer network, the Internet or a building management
system.
Connectivity
Controller ID
Default
IP
192.168.0.50
1 / 2
Modbus ID
RS-485
IP mask
255.255.0.0
1
19200
Connectivity
BaCnet port
47808
BaCnet ID
0000166
2 / 2