komfovent PRO2 Highly Efficient Air Handling Units

Specifications

• Model: RHP PRO2
• Manufacturer: UAB KOMFOVENT
• Functions: Air handling unit with integrated heat pump for heating and cooling

Product Usage Instructions

Introduction

• Before turning on the unit, contact your installer or Komfovent representative to ensure operational status.

Air Handling Unit Functions

• The air handling unit is controlled by an integrated automation system, offering various ventilation modes and functions:

Ventilation Modes

• The unit operates in user-selected ventilation modes with additional functions to adjust fan speed and power of heaters/coolers.

Air Flow Control

• Refer to the Control and Settings chapter for information on selecting air flow control methods.

Temperature Control

• The unit features temperature control capabilities for optimal comfort.

Air Quality Control (AQC)

• The AQC function adjusts ventilation intensity based on indoor air quality, gradually increasing airflow when air quality drops.

Outdoor Compensated Ventilation (OCV)

• The OCV function adjusts ventilation intensity based on outdoor conditions and has priority over AQC function.

FAQ

• Q: What should I do if the unit displays error messages or stops operating?
  • A: Contact your installer or Komfovent representative for assistance in troubleshooting and resolving issues with the unit.

“`

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 filtered fresh outdoor air. RHP Pro2 air handling units are designed for ventilation of medium or large commercial or industrial premises (e.g., stores, offices, hotels, etc.) where a standard air temperature and humidity must be maintained. These air handling units are not intended for air flows 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 during ventilation, therefore, we do not recommend using this unit as the main heating/cooling source. The unit may fail to reach the user-defined supply air temperature when the actual room temperature significantly differs from the desired room temperature. This condition results in inefficient 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 dehumidification 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 specified 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 effective usage of natural resources. For more information about where you can drop off your waste for further recycling, contact your city authorities, waste management organisations, approved WEEE scheme or your household waste disposal service.

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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 filters are installed. · Condensate drainage is connected and siphons are filled with water. · All doors are closed and/or locked and all protective caps are screwed on.
· The operation, maintenance or repair of the air handling unit is prohibited for people (including children) with mental, physical or sensory disabilities, as well as for persons without sufficient experience and knowledge, unless supervised and instructed by the person responsible for their safety in accordance with these instructions.
· 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.

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.

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· 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 flow control
Fan speed of AHU is adjusted by the selected air flow control method: · CAV ­ constant air volume control. Fan speed is adjusted by measuring air flow 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 filters get contaminated, fan speed is automatically increased to ensure the same volume of air as during operation with clean filters. 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 flows 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 flow control method requires additional air duct equipment, therefore, use these functions only after consulting the installer or other qualified professional.
· For proper operation of a heat pump, a certain amount of air is required (see “Installation Manual”). With VAV or DCV functions, heat pump capacity may be temporary reduced due to insufficient airflow.
For information on how to select an air flow 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-defined temperature. Then, depending on whether the supplied air requires heating or cooling, heat exchanger or additional heaters/coolers are activated. Available temperature control methods: · Supply air temperature control ­ the unit supplies air of user-defined 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-defined 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 control panel 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 to “Minimum airflow” proportionally to the rising (summer temperature range) or decreasing (winter temperature range) outdoor temperature.

Ventilation intensity, %

Air flow setting

20

Winter

Winter

Summer

Summer

compensation compensation compensation compensation

stop

start

start

stop

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-defined 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 insufficient 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 Settings”.

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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-defined 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 control panel 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 fills 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-defined 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 off, 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 off 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 ope-
rating or stopped. · When running ­ function is activated by closing contacts when the unit is operating. When the unit
is stopped with a control panel 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. Filter impurity indication
The air handling unit has separate pressure sensors for measuring differential pressure upstream and downstream the filters. The initial pressure drop of clean filters is pre-programmed in the factory according to the type of filters used. This value is used to calculate the pressure value for filter replacement; filter contamination level is displayed as a percentage.
In case filters from another manufacturer or filters of other filtration class are used instead of factoryfitted filters, calibration of clean filters 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 filters see Chapter “Periodic Maintenance”.
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 off as soon as desired temperature is reached.
A certain airflow is required to ensure proper operation of a heat pump (see “Installation Manual” or technical data sheet of your unit), i. e. to ensure efficient heat exchange and maintain refrigerant pressure within limits. When airflow drops below a minimum limit, a heat pump capacity is temporarily reduced and resumed only when airflow 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 possible air volume difference between the supply and extract airflows. In case of high flow imbalances (>20%), capacity and efficiency 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.
· When the demand for heating or cooling is not high (for example, when the air temperature needs to be changed by only a few degrees) and the intensity of ventilation is low, larger fluctuations than the normally supplied temperature can be felt. This may be because the compressor, even at minimum capacity, will provide more heat/ cool than is required to reach the desired temperature. In such cases, we recommend increasing the air flow of the unit or changing temperature setpoint.
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”).

1 Depends on configuration.

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2.12. Protective functions
The air handling unit is equipped with several protective functions that affect 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 fire alarm function stops the air handling unit as soon as a signal from the building’s fire alarm system or smoke detectors is received. This immediately stops ventilation and fresh air from entering fire zones to prevent fire 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 fire alarm, for example, due to fire protection system inspections, the air handling unit will need to be restarted after turning off the signal and clearing the fire 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 off the fire alarm.
Connection of the building’s fire protection system signal is described in the “Installation Manual”. Internal fire 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 fire zones both inside and outside the building. This function prevents smoke from spreading inside the premises and warns about a potential fire hazard if the building’s fire 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 different 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 airflow speed. Protection is restored as soon as the heater cools down and thermostat temperature drops. Heater operation is restored automatically. · Manual reset thermostat 100°C. This thermostat, in case of overheating, completely disconnects the heater`s power supply to protect control electronics and adjacent plastic components. Protection may be reset by pressing the RESET button inside the unit (see Chapter “Troubleshooting”).
Eliminate the cause of overheating before restoring the manual reset thermostat of 100°C.
Fan cooling of heating / cooling / humidification devices. If the air-handling unit is stopped while heat pump, electric heater, humidifier or direct evaporation (DX) unit is still running, fan cooling is initiated. Fans run at fixed speed until heater tubes cool down or heat pump’s / DX unit’s refrigerant pressures stabilize. Also during blowing time, the already produced water vapor is removed from the humidifier section1, preventing it from condensing inside the AHU. Blowing time depends on the accumulated heat/cold and ventilation intensity 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.

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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 flow 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 airflow 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 difference upstream and downstream the evaporator heat exchanger. When condensate accumulates in heat exchanger 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.

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 flows 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 flow. 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.

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· By outdoor temperature The user sets outdoor temperature limits at which the recirculation damper will be opened
proportionally:
100

Recirculated air, %

0

Winter recirculation
stop

Winter recirculation
start

Summer recirculation
start

Outdoor temperature, °C Fig. 2. REC function operation

Summer recirculation
stop

· 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 specifies 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-defined air humidity level. This function controls air humidifiers or dehumidifiers according to the user-defined humidity level and also can perform dehumidification using integrated 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 relative humidity level (RH) ­ a duct-mounted supply air humidity sensor is needed. Air
humidity setpoint is set in %RH. · Supply air absolute humidity level (AH) ­ a duct-mounted supply air humidity sensor is needed. Air
humidity setpoint is set in g/m3 or g/kg. · Indoor air relative 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 humidifier/dehumidifier 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 different 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 flow, 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 configured 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 different 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 configured 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 difference between supply and extract airflows inside of AHU, by regulating damper position. Function ensures that extracted air is not returned to the supply flow through heat exchanger and increases purge sector (if installed on AHU with rotary heat exchanger) efficiency.

In cases, when AHU cannot reach set extract air flow (for example because of incorrectly designed or poorly installed duct system), it is possible, that airflow will be reduced during operation of pressure auto balance function and too low airflow alarm will be indicated. It is recommended to reduce airflow 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 fire alarm is triggered, an additional smoke by-pass damper is opened (see “Installation manual”). In this way, smoke and other gases generated by fire by-passes AHU filters, 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 fire 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 fire can be selected: · Default ­ the unit is completely stopped in the event of a fire 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.

CONTROL AND SETTINGS

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 off with a single tap.

16:30
21,9 °C 21,3 °C
Temperature
ECONOMY 1

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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.

Main screen

Time

16:30

Display of function/mode operation

Menu window
Menu

21,9 °C 21,3 °C

Main parameter overview window

Overview

Scheduling

Selection of ventilation modes
Back
Activate mode or function

Temperature ECONOMY 1

Switching of overview windows
Menu

Selection of ventilation modes
Operation modes COMFORT 1 COMFORT 2 ECONOMY 1 ECONOMY 1 SPECIAL OFF

Change settings

Confirm

Functions

Settings

Parameter modification window
Setpoint 40,0 °C
21,0
5,0 °C

Parameter to be changed Maximum possible value Increase
Current setting
Decrease Minimum possible value Cancel

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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 flow increasing by activated function (see chapter Functions) Air flow decreasing by activated function (see chapter Functions) Energy recovery operation Air heater operation Air cooler operation Air humidifier operation Summer night cooling mode Weekly operation mode Holiday operation mode ,,Override” mode Alarm signal Heat pump operating prohibition1

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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4.1. Parameter overview

The following parameters are displayed in the main window and parameter overview windows: air flow, temperatures, air quality sensor data and energy recovery. Use arrows on the sides of the main screen to browse across parameter windows.

16:30

16:30

16:30

16:30

21,9 °C 21,3 °C

12500 m³/h 13100 m³/h

60% RH 800 ppm

90% 18 kW

Temperature ECONOMY 1

Air flow ECONOMY 1

Air quality ECONOMY 1

Energy saving ECONOMY 1

For more parameters see “Detailed information” screen (Menu Overview Detailed information).

Menu Overview Scheduling

Functions

Settings

Overview Alarms Operation counters Efficiency status Detailed information

Detailed information
Supply temperature 21,9 °C
Extract temperature 22,1 °C
Outdoor temperature 16,6 °C
Water temperature 25,3 °C
Supply flow 350 m3/h
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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. Confirm 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 confirm the message that appears.

16:30
–,- °C –,- °C
Temperature OFF

16:30
21O,9N?°C 21,3 °C
Temperature OFF

Operation modes COMFORT 1 COMFORT 2 ECONOMY 1 ECONOMY 2 SPECIAL OFF

Operation modes Oro kokyb
COMFORT 1
COMFORT 2
ECONOMY 1
ECONOMY 2
SPECIAL
OFF

Operation modes
COMFORT 1
COMFOCRhTan2ge operation mode?
ECONOMY 1
ECONOMY 2
SPECIAL
OFF

16:30
21,9 °C 21,3 °C
Temperature ECONOMY 2

During the first 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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4.2.1. Calibration of the HP evaporator pressure-drop exchanger during commissioning
The first time you turn on your air handling unit, you will have to perform calibration of a HP evaporator (if not performed during installation). This calibration is necessary for proper operation of the antifreeze prevention function.
16:30
Start 2H1P ,e9xc°hCanger ca2li1b,r3ati°oCn?
Temperature
STARTING

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 confirm. 5. Press the return icon at the top of the screen to return to the home screen.

16:30

Operation modes

ECONOMY 2

Supply flow

COMFORT 1

1250 m3/h

3

–,- °C –,- °C

COMFORT 2 ECONOMY 1

Extract flow 1250 m3/h
Setpoint 20 °C

ECONOMY 2

Temperature

SPECIAL

3

OFF

OFF

Reset settings

Supply flow 1300 m3/h

Setpoint 40,0 °C

1250

21,0

600 m3/h

5,0 °C

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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 off and will not be activated even when temperature exceeds the desired temperature during the day).
SPECIAL Supply flow 680 m3/h Setpoint 21 °C Heating On Cooling On Humidifying On
Reset settings
4.4. Scheduling window and ventilation schedule settings
In menu item “Scheduling” you can create your own ventilation schedules so that the ventilation intensity or temperature settings change automatically.
Scheduling
Operation program
Holidays
Recirculation schedule

· 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 specified 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.

1 Standby mode is optional. The device will only operate at a set time. The unit will automatically stop during unspecified periods.

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Menu

Overview

Scheduling

Scheduling Operation program Holidays Recirculation schedule

Functions

Settings

Operation program Enable Program 1
Add new program

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 STANDBY
COMFORT 1 COMFORT 2

Weekdays

Mo

Tu

We

Th

Fr

Sa

Su

Start time
18 : 30

· 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 office during Christmas holidays).

Holidays Holidays 1

Holidays 2
Operation mode STANDBY
From 12/14
Till 12/26

Add new holiday

Delete holiday

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· Recirculation schedule1 When the unit is equipped with a recirculation section, recirculation damper can be controlled accord-
ing to a user-created weekly schedule (maximum of 5 different schedules) with a user-defined day of the week, hours and recirculation level %.

Recirculation schedule Schedule 1

Schedule 1
Level 70 %
Weekdays Mo/Tu/We/Th/Fr/Sa/Su
Start time 00:00
Stop time 24:00

Add new schedule

Delete schedule

4.5. Overview window
“Overview” screen shows information about the status of the air handling unit and its devices.

Menu

Overview

Scheduling

Functions

Settings

Overview Alarms Operation counters Efficiency status Filter status Detailed information

· Alarms
This menu item displays relevant messages with identification codes. “A” at the end of the code means that the error is critical and the unit will be stopped until the fault is rectified. “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.

Alarms
21A Electric heater overheating
3B VAV calibration fail

Delete

History

1 Displayed only when this function is pre-ordered. 24

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· 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.

Operation counters
Air heater 121 kWh
Supply fan 873 h
Exhaust fan 875 h
Recovered energy 1440 kWh

Operation counters
Air heater 121 kWh
SupplyRefasnet air heater 873 hoperation counter?
Exhaust fan 875 h
Recovered energy 1440 kWh

· Efficiency Heat exchanger parameters are displayed in real-time. In this menu you can also calibrate HP evaporator, if not calibrated during the first start-up. If calibration
was successful and the display shows “Calibrated”, there is no need to repeat it. During calibration, the unit will run for 10 minutes by changing fan speed and will be measuring pressure inside the unit, therefore, do not open the unit door, do not adjust the duct system or change parameters at that time. To stop calibration, turn off the unit with a control panel.
Efficiency status
Heat exchanger efficiency 83%
Energy saving 90%
Energy recovery 4,1 kW

HP exchanger calibration Calibrated

· Filter status In this menu you can check filter impurity levels. When the contamination level reaches 100%, a mes-
sage urging to change filters is displayed. After changing the filters, delete the message to reset the contamination level. If you have changed the filters in advance, without receiving a message, you can also reset their impurity level in the same window.

Filter status
Outdoor air filter impurity 67%
Extract air filter impurity 53%

Filter status

Outdoor air filter impurity 67%

Extract air filter impurity

53%

Reset?

Clean filters calibration

Clean filters calibration

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When replacing filters with filters from different manufacturers or different filtration class, calibration of clean filters is recommended. During calibration, the unit will operate at a maximum speed for a few minutes, measure the pressure difference upstream and downstream the filter and automatically determine the filtration class.

Filter status

Outdoor air filter impurity 67%

Extract air filtSetrarimt purity

53%

calibration?

Clean filters calibration
· 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.
Detailed information
Supply temperature 21,9 °C
Extract temperature 22,1 °C Outdoor temperature 16,6 °C Water temperature 25,3 °C Supply flow 350 m3/h
1 / 3

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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.

Menu

Overview

Scheduling

Functions

Settings

Functions
Air quality control
Operation on demand Outdoor compensated ventilation Summer night cooling Minimum temperature control
1 / 2

Functions
Override function
Humidity control
Recirculation control
1st additional zone control 2nd additional zone control
2 / 2

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 different 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 different ventilation mode than the one set, air quality control function will be disabled automatically.
Air quality control
Enable
Setpoint 1 1000 ppm
Mode 1 COMFORT 1
Setpoint 2 880 ppm
Mode 2 COMFORT 2
Reset settings

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· Operation on demand (OOD) Setting a critical air quality sensor value. The unit starts as soon as this value is exceeded.
Operation on demand Enable Setpoint 1000 ppm

Reset settings

· 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 compensation start”, the unit operates in a selected ventilation mode and when ourdoor temperature is out of range, fan speed is decreased to “Minimum airflow”.

Outdoor compensated…
Enable
Minimum airflow 20 % Winter stop -15 °C
Winter start 5 °C Summer start 25 °C
1 / 2

Outdoor compensated… Summer stop 35 °C
2 / 2
Reset settings

· Summer night cooling (SNC) Setting two indoor temperatures for the function to start running and stop.
Summer night cooling
Enable
Start when indoor 25 °C Stop when indoor 20 °C

Reset settings

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· Minimum temperature control (MTC) Setting a minimum desired supply air temperature.
Minimum temperature …
Enable Setpoint 15 °C

Reset settings
· 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.
Override function
Enable
Override If on Operation modes ECONOMY 1

Reset settings

· Humidity control (HUM) Setting a desired relative or absolute humidity level. Humidity level is set for two different 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 different ventilation mode than the one set, humidity control function is disabled automatically.

Humidity control
Enable
Setpoint 1 55% RH Mode 1 COMFORT 1 Setpoint 2 30% RH
Mode 2 ECONOMY 2
Reset settings

Humidity control
Enable
Setpoint 1 10 g/m3 Mode 1 COMFORT 1 Setpoint 2 8 g/m3 Mode 2 ECONOMY 2
Reset settings

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· Recirculation control (REC)1

Recirculation control
Enable
Setpoint 1 800 ppm Min. fresh air 1 40 % Mode 1 ECONOMY 1
Reset settings
1 / 2

Recirculation control
Enable
Winter stop -20 °C
Winter start -5 °C Summer start 25 °C
Summer stop 40 °C
Reset settings

Recirculation control Enable Default recirculation 0 % Activated recirculation 100 %
Reset settings

Function windows displayed on the controller depend on the selected recirculation control method (see Chapter “Optional Functions”):
­ By air quality Setting the indoor air quality limit up to which the extracted air is recirculated. The minimum position of the opened recirculation damper is also indicated, i.e. the minimum volume of fresh air to be supplied from the outside (as a percentage of the set air volume) even when the indoor air quality is good. Air quality limit is set for two different 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 different ventilation mode than the one set, REC function is disabled automatically. ­ By outdoor temperature Setting four outdoor temperature values for controlling the recirculation damper position. ­ By schedule In this screen you can only activate/deactivate the recirculation function; recirculation schedule is created in the Planning menu (see Chapter “Planning Window and Ventilation Schedule Settings”). ­ Control by external signal Recirculation damper position is set for open (default recirculation) and closed (activated recirculation) control signal contacts.
· Additional zone control (ZN)2 In this window you can set a desired supply air temperature for an individual ventilation zone.

1st additional zone c…
Enable
Setpoint 22.0 °C

Reset settings

1 Displayed only when this function is pre-ordered. 2 This function only runs when optional additional zone modules are connected.

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· Water heater/cooler It is possible to block the water heaters and coolers by removing the check mark next to the related
setting. In this case, water heaters and coolers will not be used either for the desired temperature or in any functions (for example during dehumidification). However, the water heater’s freeze protection will work all the time, and if the water temperature drops below the critical limit, AHU will be stopped.

Functions
Override function
Humidity control
1st additional zone control 2st additional zone control Water heater/cooler
2 / 2

Water heater … Water heater Water cooler
Reset settings

4.7. Settings
All settings are divided into two groups, covering the main settings of the air handling unit and the user interface.

Settings Air handling unit Personalization

Air handling unit Temperature control Flow control Air quality Time/Date Connectivity
1 / 2

Air handling unit Heat pump Panel sensor calibration
Reset settings
2 / 2

Personalization
Language English
Flow units m3/h
Screen saver On
Panel lock Off
Touch sound Click

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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 flow 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 and REC functions by air quality.
Sensor type CO2 VOCq VOCp RH TMP

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· Time/data Time and date settings are used for ventilation by weekly, holiday and recirculation schedules.

Time/Date
Time 09:40
Day/Month 25/05
Year 2022
Daylight saving time On

Daylight saving time Enable

· 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
IP mask 255.255.0.0
Modbus ID 1
RS-485 19200
1 / 2

Connectivity BaCnet port 47808 BaCnet ID 0000166
2 / 2

· Panel sensor calibration If the temperature and/or relative humidity measured by internal control panel sensors do not match
the parameters measured by other devices, the accuracy of the sensors can be adjusted in this menu. The measured temperature may be adjusted within ± 5 ° C and the humidity within ± 10% range.

Panel sensor calibration
Temperature correction 0,0°C
Humidity correction 0,0%RH

Temperature correction 5,0 °C
0,0°C

Humidity correction 10,0%RH
0,0%RH

-5,0 °C

-10,0%RH

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· Heat pump If the heat pump evaporator fails to defrost automatically (see “Troubleshooting”), it can be defrosted
manually. Manual defrosting takes about 10-20 minutes, and during it, the air handling unit may supply a slightly lower than desired temperature.

Heat pump
Manual defrost Off

Heat pump Manual defrost Off
ON?

4.7.2. Customization
· Language Selecting language of the user interface.
Language Lietuvi
English
Pycc
· Flow units Selecting measurement units for air flow measurement. “Pa” can only be selected if the VAV flow
control type is enabled.
Flow units m³/h l/s m³/s Pa

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· Screen saver Screen saver is activated after 1 minute of inactivity on the control panel. In this menu the user can en-
able/disable a screen saver and select parameters to be displayed on screen.

Screen saver
Enable
Brightness 55%
Row 1 Time
Row 2 Panel temperature
Row 3 Panel humidity

Brightness 25% 50% 75% 100%

Row 1 Time Panel temperature Panel humidity Supply temperature Extract temperature
1 / 2

· Panel lock The panel can be locked using a four-digit code. To activate a panel lock, enter your PIN code and press
Confirm. When the lock is activated, the panel will lock every time a screen saver appears. You will need to enter the same code again to access the main window or other settings. You must enter a correct PIN code to use the panel. To deactivate the panel lock, enter the same PIN code again in the setup menu.
If you forget your PIN code, you can unlock the panel by connecting to the air handling unit with a computer and resetting factory settings (see Chapter “Control via Computer”).

Panel lock Off On

· Touch sounds You can turn on/off touch sounds. Two types of touch sounds are available.
Touch sound Off Click Beep

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5. CONTROL AND SETTINGS. COMPUTER
The unit may be controlled via computer using a web browser. For information on how to connect the unit to an internal network or directly to a computer, see the “Installation Manual”.
Enter the device IP address in your web browser (IP address is displayed on the control panel) (see Settings Air handling unit Connectivity):
C5 Komfovent
192.168.0.50
Connect to the user interface: enter the user name user, password user1 and press “Login”.

Username: user

Password:

Login

If the login is successful, the overview window is displayed. The overview window contains a simplified diagram2 and information about operation of the unit. You can also turn your AHU on/off in this window.

Setting windows

Overview Modes Functions Alarms/Status Scheduling Settings

30%

8.0 °C

10 Pa 26.2 °C

10 Pa

10.0 °C

30%

100% 48% 26 °C

AHU control Operation mode Active functions Alarm status

On/Off Economy1
No alarms

1200ppm 600ppm
2000 m³/h 2000 m³/h
27.9 °C
2000 m³/h 2000 m³/h

Simplified functional diagram of the unit
ON/OFF button Current status of the unit Currently running functions Status of messages and errors

5.1. Modes
In this menu item, the user can alter the ventilation mode, flow and temperature control settings. Press the “Save” button for the changes to take effect.
OPERATION MODES FLOW CONTROL MODE TEMPERATURE CONTROL MODE
Save

1 If You forgot a changed password, it can be reset to the initial “user” from the control panel (SettingsAir handling unitReset settings).
2 Displayed unit diagram depends on the unit type and ordered components.

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5.1.1. Operation modes
In this menu item the user can select one of the five ventilation modes for the unit (see Chapter 2.1 “Ventilation Modes”). Selecting the “Program” mode:

OPERATION MODES Mode selection

Comfort1
Comfort2 Economy1 Economy2 Special Program

You can select air volume (for supplied and extracted air separately) and desired temperature for each ventilation mode. Air volume is set in the units specified in the user interface settings.

Comfort1 Supply flow Extract flow Setpoint

6000 6000

m³/h m³/h

21.0 °C

“Special” ventilation mode may also be used to block heating/cooling signals and disable recirculation and humidification functions. To disable a function, uncheck a box next to the setting.

Special Supply flow Extract flow Setpoint Heating Cooling Recirculation Humidifying

12000 12000

m³/h m³/h

21.0 °C

5.1.2. Flow control modes

Selecting an air flow control method for controlling fan speed (see Chapter 2.2 “Air Flow Control”).

FLOW CONTROL MODE Mode

CAV VAV DCV

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5.1.3. Temperature control modes

Selecting a temperature control method for controlling heating/cooling devices (see Chapter 2.3 “Temperature Control”).

TEMPERATURE CONTROL MODE Mode

Supply
Extract Room Balance

5.2. Functions
Here you can enable/disable ventilation functions and change their settings.

5.2.1. Air quality control (AQC)

Selecting air quality limit up to which the air handling unit will operate in a selected mode and above which the ventilation intensity will be automatically increased. Air quality limit is set for two different 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 different ventilation mode than the one set, air quality control function will be disabled automatically.

AIR QUALITY CONTROL (AQC) Enable Setpoint 1 Mode 1 Setpoint 2 Mode 2

800

ppm

Economy1

1200

ppm

Comfort1

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5.2.2. 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 compensation start”, the unit operates in a selected ventilation mode and when ourdoor temperature is out of range, fan speed is decreased to “Minimum airflow”.

OUTDOOR COMPENSATED VENTILATION (OCV)
Enable Minimum airflow Winter compensation stop Winter compensation start Summer compensation start Summer compensation stop

20 % -40.0 °C 0.0 °C 20.0 °C 50.0 °C

5.2.3. Minimum temperature control (MTC)
Setting a minimum desired supply air temperature.
MIN. TEMPERATURE CONTROL (MTC) Enable Setpoint

18.0 °C

5.2.4. Summer night cooling (SNC)
Setting two indoor temperatures for the function to start running and stop.

SUMMER NIGHT COOLING (SNC) Enable Start when indoor Stop when indoor

25.0 °C 25.0 °C

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5.2.5. 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.

OVERRIDE FUNCTION (OVR)
Enable Override Mode

All time Comfort2

5.2.6. Operation on demand (OOD)

Setting a critical air quality sensor value. The unit starts as soon as this value is exceeded.

OPERATION ON DEMAND (OOD) Enable Setpoint

800 ppm

5.2.7. Recirculation control (REC)1

Displayed function windows depend on the selected recirculation control method (see Chapter 3 “Optional Functions”):
· By air quality Setting an indoor air quality limit up to which the extracted air is recirculated. The minimum position of
the opened recirculation damper is also indicated, i.e. the minimum volume of fresh air to be supplied from the outside (as a percentage of the set air volume) even when the indoor air quality is good. Air quality limit is set for two different 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 different ventilation mode than the one set, REC function is disabled automatically.

RECIRCULATION CONTROL (REC) Enable Setpoint 1 Min. fresh air 1 Mode 1 Setpoint 2 Min. fresh air 1 Mode 2

600 ppm 40 % Comfort1 800 ppm 20 % Comfort2

1 Displayed only when this function is pre-ordered. 40

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· By outdoor temperature Setting four outdoor temperature values for controlling the recirculation damper position.

RECIRCULATION CONTROL (REC) Enable Winter recirculation end Winter recirculation start Summer recirculation start Summer recirculation end

-40.0 °C 0.0 °C 20.0 °C 50.0 °C

· By schedule Here you can only activate/deactivate a recirculation function; recirculation schedule is created in the
Scheduling menu (see Chapter 5.4 “Scheduling”).
RECIRCULATION CONTROL (REC)
Enable

· Control by external signal Recirculation damper position is set for open (main recirculation) and closed (activated recirculation)
control signal contacts.

RECIRCULATION CONTROL (REC)

Enable

Default recirculation Activated recirculation

0

%

60 %

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5.2.8. Humidity control (HUM)1
Setting a desired relative or absolute humidity level. Humidity level is set for two different 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 different ventilation mode than the one set, humidity control function is disabled automatically.

HUMIDITY CONTROL (HUM) Enable Setpoint 1 Mode 1 Setpoint 2 Mode 2

50 %RH Comfort1 60 %RH Comfort2

HUMIDITY CONTROL (HUM) Enable Setpoint 1 Mode 1 Setpoint 2 Mode 2

10 g/m³

Comfort1

8

g/m³

Comfort2

5.2.9. Additional zone control (ZN)2
Setting a desired supply air temperature for an individual ventilation zone. You can also monitor temperature of air supplied to the additional zone as well as the heating/cooling signals.

1ST ADDITIONAL ZONE CONTROL (ZN1) Enable Setpoint Supply temperature Heating Cooling

21.0 °C 0.0 °C 0.0 % 0.0 %

1 Displayed only when this function is pre-ordered. 2 This function only works when optional additional zone modules are connected.

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5.2.10. Water heater/cooler
It is possible to block the water heaters and coolers by removing the check mark next to the related setting. In this case, water heaters and coolers will not be used either for the desired temperature or in any functions (for example during dehumidification). However, the water heater’s freeze protection will work all the time, and if the water temperature drops below the critical limit, AHU will be stopped.
WATER HEATER/COOLER Water heater Water cooler
5.3. Alarms/Status
This menu item shows information about the air handling unit and its assemblies.
ACTUAL ALARMS ALARM HISTORY OPERATION COUNTERS EFFICIENCY STATUS VAV STATUS CONTROLLER STATUS
5.3.1. Actual alarms
This menu item displays relevant messages with identification codes. “A” at the end of the code means that the error is critical and the unit will be stopped until the fault is rectified. “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”.
ACTUAL ALARMS 119A: Communication error 118A: Communication error 117A: Communication error 127B: Service mode Reset

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5.3.2. Alarm history

Displays the last 50 messages and errors, along with the date and time they occurred.

ALARM HISTORY 30-03-2019 18:44:03 27-03-2019 10:10:09 26-03-2019 16:25:07

5B: Change extract air filter 4B: Change outdoor air filter 1B: Low supply air flow

5.3.3. Operation counters
Depending on the configuration of the unit, operating meters display operating time of various units and the amount of energy returned by the heat exchanger.

OPERATION COUNTERS Air heater operation Supply fan operation Exhaust fan operation Recovered energy

151 h 366 h 363 h 2227 kWh

Reset Reset Reset Reset

5.3.4. Efficiency status
EFFICIENCY STATUS Heat exchanger thermal efficiency Heat exchanger recovery Thermal energy saving HP exchanger calibration

Calibrated

–8.6 W 100 % Run

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In this menu you can also calibrate HP evaporator, if not calibrated during the first start-up. If calibration was successful and the display shows “Calibrated”, there is no need to repeat it. During calibration, the unit will run for 10 minutes by changing fan speed and will be measuring pressure inside the unit, therefore, do not open the unit door, do not adjust the duct system or change parameters at that time. To stop calibration, turn off the unit with a control panel or in the Overview screen.

Start HP exchanger calibration?

Ok

Cancel

5.3.5. Filter status
In this menu you can check filter impurity levels. When the contamination level reaches 100%, a message urging to change filters is displayed. After changing the filters, delete the message to reset the contamination level. If you have changed the filters in advance, without receiving a message, you can also reset their impurity level in the same window.

FILTER STATUS Outdoor air filter impurity Extract air filter impurity Clean filters calibration

0 %

Reset

0 %

Reset

Run

When replacing filters with filters from different manufacturers or different filtration class, calibration of clean filters is recommended. During calibration, the unit will operate at a maximum speed for a few minutes, measure the pressure difference upstream and downstream the filter and automatically set the filtration class.

5.3.6. VAV status

This window is intended for VAV mode calibration. Calibration must be performed by a qualified specialist in accordance with a separate “VAV Function Installation Instruction”.

VAV STATUS VAV mode VAV calibration

Double Run

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5.3.7. Controller status

Overview of the controller and control panel software versions.

CONTROLLER STATUS Main module firmware 1st zone module firmware Control panel firmware Log

v2.340 v1.200 v2.223
Download

For detailed performance analysis, you may download a device logbook (Log) which contains weekly operation data. To open a logbook you will need a “Log plotter” app that you can download on the “Komfovent” website. This data can be useful in the event of a failure and may facilitate repair procedures, therefore, we recommend downloading an operation logbook and handing it over to the authorised service personnel.

5.4. Scheduling
In this menu the user can set weekly, holiday and recirculation schedules.
OPERATION PROGRAM HOLIDAYS RECIRCULATION SCHEDULE
Save

5.4.1. 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. When the “Program” mode is selected in the ventilation mode setup screen, the air handling unit will only operate at a specified time. There is no need to set periods for stopping the unit.

OPERATION PROGRAM

Mo Tu We Th Fr Sa Su

Start

06 : 00

08 : 00

17 : 00 00 : 00

Stop 08 : 00 17 : 00 24 : 00 24 : 00

Mode Comfort1 Economy2 Special Comfort2

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5.4.2. Holidays
Here you can select a holiday program, to set dates for the unit to run in a selected mode or to be stopped (e.g., stopping the air handling unit in the office every year during Christmas holidays).

HOLIDAYS Day – Month – Year 24 – 12 – 2019

Day – Month – Year

–

10 – 01 – 2020

Mode
Special
Standby Comfort1 Comfort2 Economy1 Economy2 Program

5.4.3. 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 different schedules) with a user-defined day of the week, hours and recirculation level %.

RECIRCULATION SCHEDULE

Mo Tu We Th Fr Sa Su

Start

13 : 00

:

Stop 16 : 00
:

Level 60 %
%

5.5. Settings
Settings menu is intended for user interface configuration. Here you can set the time, language, measurement units, computer network settings, or change the login password.
DATE/TIME CONNECTIVITY USER INTERFACE LOGIN PASSWORD SETTINGS RESET HEAT PUMP Save

1 Displayed only when this function is pre-ordered.

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5.5.1. Date/time
In this menu item the used can set the time and date of the unit, used for various functions and operation by a weekly schedule. When the “Daylight Saving Time” function is enabled, the clock will automatically switch between summer time and winter time in spring and autumn.

DATE/TIME Day – Month – Year Time Daylight saving time

28 – 06 – 2020 07 : 49

5.5.2. Connectivity
Setting IP address, Modbus and BACnet or computer network parameters.

CONNECTIVITY IP IP mask Modbus ID RS-485 Modbus ID Modbus ID

192 . 168 255 . 255 1 19200 baud 47808 166

.0 .0
8E1

. 50 .0

5.5.3. User interface

Here you can select the user interface language (the same language will be used on the control panel), air flow measurement units and the device name that will be displayed in the web browser. If one computer is used to control several air handling units, we recommend naming every unit differently. This will facilitate distinguishing the units.

USER INTERFACE Language Flow units AHU name

English m³/h Komfovent

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5.5.4. Log-in password
Here you can change your password used to log in to the air handling unit in a web browser. New password must have at least 4 characters. Forgotten password can be restored by resseting AHU settings to factory defaults.
LOGIN PASSWORD
Enter new password Confirm new password

5.5.5. Restoring factory settings

Click the “Reset” button to undo all user-performed changes (desired temperature, air volume, function settings, weekly schedule, etc.) and to restore factory settings (the user interface language will be restored to English).

SETTINGS RESET Reset settings to default values

Reset

A factory reset also removes a PIN code. If you have locked the panel and forgot the PIN code, a factory reset will restore the PIN code to 0000 and then you will be able unlock it.

Write down the computer network parameters before restoring factory settings (see Menu “Connectivity”), as these settings will also be reset and communication with the air handling unit may be lost until re-configuration.

5.5.6. Heat pump
If the heat pump evaporator fails to defrost automatically (see “Troubleshooting”), it can be defrosted manually. Manual defrosting takes about 10-20 minutes, and during it, the air handling unit may supply a slightly lower than desired temperature.

HEAT PUMP

Manual defrost

Run

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CONTROL VIA A SMARTPHONE

“Komfovent C5” app is necessary for controlling your air handling unit via your mobile phone. The unit can be controlled in a local network via mobile phone. Controlling the air handling unit with your mobile device is almost the same as with a C5.1 control panel. Screens and settings are so similar that you can follow the chapter “C5.1 Control Panel” to perform necessary changes or settings. The app language is automatically selected according to the language used in your mobile device and can differ from the language set in your air handling unit.
Connect the unit to a network router. The unit IP address must be on the same gateway as the network router. If the default IP address is incorrect, set the IP address and IP mask (see the “Connectivity” menu). Connect your mobile device to the internal network via Wi-Fi and run the “Komfovent C5” app. Launched for the first time, “Komfovent C5” app will attempt connecting to default IP address (192.168.0.50) (if not changed); after a while a home screen for the air handling unit will appear on the mobile phone screen. If you changed the IP address according to the router settings, “Communication error” message will be displayed. In this case connection settings must be changed: · Press Menu Settings Connectivity.

–,- °C –,- °C
Temperature

Menu Overview Scheduling Functions Settings

Settings Temperature control Flow control Time/Date Flow units Connectivity

CONNECTING…

Communication error

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· Press “Add new” at the bottom. · Enter your device name and new IP address. · Enter port number 502 and confirm settings.
Connectivity
Default 192.168.0.50:502

Connectivity
192.168.N0a.m50e:502 Komfovent IP address
123.123.123.123 PORT number 502

Add new

Delete

12 45 78 Pri,dti nauj0

3 6

9

x

.Istrinti

· Select a row with newly entered settings and press the return button. · When the app asks you if you want to connect to the selected unit, confirm the message. · Once connected to the unit, the main screen and current status of the unit will be displayed on the app.

Connectivity
Default 192.168.0.50:502 Komfovent 123.123.123:502

Connectivity
Default 192.168.0.50:502 Komfovent 123.123.123:502
Connect to selected AHU?

21,9 °C 21,3 °C

Temperature

Add new

Delete

Add new

Delete

ECONOMY 1

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PERIODIC MAINTENANCE

The air handling unit must be serviced by a qualified technician or authorized service representative.

· Before starting any tasks, make sure that the unit is unplugged from the mains.
· Use caution when performing works near internal or external heaters as their surfaces may be hot.
· Remove all foreign objects and tools from the unit.
· Use appropriate safety equipment (gloves, goggles).
· If you have washed or cleaned any of the components, wait for them to dry completely before starting the unit.

The following table provides recommended regular maintenance intervals for the unit. Actual frequency of maintenance procedures depends on operating conditions, amount of dust and impurities in the supplied air as well as environment in which the unit is installed. Maintenance intervals may be shorter, following the national hygiene norms and specific requirements for ventilation of the premises.

Task
7.1. Housing Mechanical damage Air-tightness and gaskets of the sections Horizontality of the sections Air-tightness and gaskets of doors and locks Air damper operation Condensate drainage Cleaning of drip trays 7.2. Filters Visual inspection of filters Inspection of differential pressure sensors Filter replacement 7.3. Fans Extraneous noise and vibrations Fan operation, speed adjustment Cleaning of the impeller Motor overheat protection 7.4. Rotary heat exchanger Belt inspection Motor operation Drum brushes and seals Free rotation and bearings of the drum Drum cleaning 7.5. Heat pump Moisture inside the refrigerant system Refrigerant leak

Frequency Commissioning 3 months 6 months 12 months

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

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Task
Operation of the compressor 7.6. Water heater/cooler Fluid leakage Operation of valves, gears, pumps Frost protection Cleaning of the heat exchanger 7.7. Direct evaporation cooler/heater Refrigerant leak Cleaning of the heat exchanger Operation of an external unit 7.8. Electrical heater Wiring Operation of overheat protection Cleaning of heating elements 7.9. Humidifier Operation of the water treatment system Check of humidifier components Cleaning of the humidifier 7.10. Silencers Inspection of silencers Cleaning of silencers

Commissioning X

Frequency 3 months 6 months

12 months X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X X

7.1. Housing
Once the unit is installed (and periodically) check whether there are no foreign objects, debris or tools inside the unit. Inner and outer surfaces shall be cleaned with a damp cloth or a vacuum cleaner. Also check the housing for mechanical damage or signs of corrosion which could affect normal operation of the unit. As building stability may change over time (e.g., settling of foundations), regular unit horizontality checks using a level gauge are recommended; levelling shall be performed if needed. Deviations must not exceed 0.3mm for 1m in the longitudinal direction and 0.5mm for 1m in the transverse direction; otherwise, sections may warp and loosen their connections. Check the unit doors for tightness and if all gaskets or sealant joints are intact. Replace gaskets and reseal joints, if needed. Inspect air collection/exhaust dampers and grilles. Remove accumulated dirt; check dampers for proper opening and tight closing. Check operation of electric actuators and wiring contacts of dampers. Check whether condensate is freely removed from drip trays; check siphons for proper operation; check drainage pipeline components for damage/blockage. If the unit is equipped with drip trays, regularly clean any dirt from drip trays.

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7.2. Filters
Check if filters are not damaged, torn or dampened. Filter replacement intervals depend on the environment as well as time of year, for example, during spring and summer filters may be contaminated with pollen, pubescence or insects, therefore replacement intervals are shorter. Replace filters if they are visibly dirty even though it is not time yet or differential pressure has not reached a critical limit yet. Contaminated filters increase pressure loss of the unit, reduce purification efficiency and increase electricity consumption of fans. If differential pressure sensors are installed, check them for proper operation; check whether their pressure tubes are clean/intact.

Fig. 3. Filter clamping device
To insert/remove filters, push two handles at the top and bottom of the filter forward to release a filter clamping device. Filters are removed/inserted one by one (number of filters depends on the unit size). Once the filters are replaced/inserted, handles are retracted and the filter clamping device presses the filters to the gaskets.
When inserting filters, make sure that their pockets are upright, filter frames are tightly seated and gaskets are intact.

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In case filters from another manufacturer or filters of other filtration class is used instead of factory-fitted filters, calibration of clean filters shall be performed after filter replacement. Filter calibration is described in chapter “Control and Settings”.
7.3. Fans
Check whether fans rotate freely without obstructions, extraneous noise and vibrations. Check the fan frame shock absorbers for wear. Replace worn out or damaged components, if needed. Dirt, grease or dust may unbalance the impeller and cause additional vibrations as well as shorten the motor service life. Impeller shall be cleaned with a damp cloth. Motor surfaces shall be cleaned with a dry cloth or a vacuum cleaner. Check motor connecting cables; check for corrosion on contacts; clean contacts with special agents, if needed. Check operation of a motor overheat protection, if installed. Turn on the ventilation device and check whether the fans are rotating to the desired direction and the rotation speed alternates depending on the automation settings.
7.4. Rotary heat exchanger
Check whether the rotor drum rotates freely, is not touching any metal parts of the housing, and its bearings are intact.
Check the actuator and motor. Rotary heat exchanger shall rotate at approx. 12rpm. Check the drum brushes for wear. Replace, if needed. Check the drum belt. Due to the natural wear of the rotor belt, green or black dust is formed, which eventually accumulates near the rotor motor. Clean it with a brush or vacuum cleaner. If there is a lot of such dust, or if it accumulates too quickly, it may mean that the belt is too worn or stretched and is rubbing against the edges of the metal parts of the heat exchanger casing. Inspect the belt for damage and tension. Worn belt may slide without turning the drum at the proper speed. Worn or torn belts must be replaced.
Air channels of the rotary heat exchanger may be contaminated with grease, oils, limescale and other dirt over time. Heat exchanger drum can be cleaned with compressed air jet (~6 bar) inside the unit. If dirt cannot be removed with compressed air or as provided for in the requirements for ventilation of the building premises, the rotary heat exchanger can be removed from the unit and washed with water (follow Annex 1 of “Rotor Cleaning Instructions”).
7.5. Heat pump
· The user can only perform visual inspections of the heat pump. Only qualified refrigeration systems’ specialists or “Komfovent” representative can perform any mechanical/electrical works on a heat pump.
· Do not unscrew any threaded connections or caps of the heat pump unit. Temperature of evaporating refrigerant is very low and causes severe frostbite in contact with skin. If you notice any discrepancies in the heat pump unit, contact a qualified refrigeration systems’ specialist or “Komfovent” representative immediately.

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Check for the presence of moisture in the refrigerant system. A sight glass with moisture indicator is provided for this purpose. The indicator is completely green when there is no moisture in the system and changes colour (to yellow or red) when moisture is detected. Check the approximate level of the refrigerant – liquid level should be at least up to ¾ of the sight glass. Visually inspect visible pipeline connections for corrosion and refrigerant leaks. With the heat pump running, make sure that the compressor is operating normally without any extraneous noises or abnormal vibrations.
7.6. Water heater/cooler
Check for fluid leakage; check for proper operation of a check valve and a pump. Check threaded connections for tightness. Check operation of an antifreeze protection system. Check whether the return water temperature sensor is installed and isolated correctly. Check a capillary thermostat, if installed, for proper operation.
Dirt from the water coil surfaces shall be removed with compressed air. Be careful not to damage the coil lamellas while cleaning.
7.7. Direct evaporation cooler/heater (DX)
Check for refrigerant leaks. In a humidity indicator check whether the refrigerant is moisture free; check for sufficient amount of refrigerant. Check operation of the external unit and temperature sensors. Perform regular maintenance works of a direct evaporation cooler/heater in accordance with the manufacturer’s documentation.
Dirt from the refrigerant coil surfaces shall be removed with compressed air. Be careful not to damage the coil lamellas while cleaning.
7.8. Electrical heater
Check operation of overheat thermostats and automation. Inspect power supply installation, contacts and automatic switches.
Heating tubes of the electrical heater may get contaminated with dust and other dirt that may ignite under excessive heat, therefore they must be cleaned. Tubes must be cleaned with a damp cloth or compressed air. Wait for the tubes to dry completely before turning on the device.
7.9. Humidifier
Regular cleaning is required for good operation of the humidifier. Cleaning intervals depend on water quality. Humidifier must be inspected at least every three months and cleaned every six months. If water contains high levels of calcium and salts, the humidifier inspection intervals must be shorter. Automatic periodic washing function of the humidifier section must be foreseen for sanitary purposes. Air supply to the ventilation system must be stopped during washing of the section. After washing, the water must be completely removed from the drainage tray.
Perform regular humidifier maintenance in accordance with the manufacturer’s documentation.

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7.10. Silencers
Silencers shall be disassembled for cleaning. Metal parts can be cleaned with a damp cloth. Noise suppression elements shall be cleaned with a vacuum cleaner. Washing or cleaning with damp products is not allowed.

TROUBLESHOOTING

Device automation continuously monitors the operation of various nodes and function algorithms. If something goes wrong, the device informs you with a message and an audible alarm from a control panel. Messages are divided into critical messages and notifications. Critical messages occur when the device cannot continue operation without intervention of the user or an authorised service representative. Notifications are used to warn the user about possible faults or small discrepancies but they do not stop the device.
In case of a message, perform the following actions: · Read the message and note its number displayed on screen (control panel, computer, smartphone). · Stop the unit. If heating/cooling devices were running at that time, after pressing the OFF button they
will keep running for a few minutes until their temperature is stabilized. · When the unit stops, unplug it from the mains. · Find tips in the “Alarm Table” by the message number. · If possible, eliminate the cause. If a fault cannot be resolved, contact an authorized service representa-
tive. · After troubleshooting, make sure no foreign objects, debris or tools are left inside the unit, and only
then close the unit door. · Connect the unit to the mains and delete all messages from the message window. · If a fault is not resolved, depending on its nature, the device may not start at all or start and then stop
after a while by displaying a message. Below is a list of messages and recommended actions to resolve faults. These messages are displayed on the C5.1 control panel, mobile app or a computer. Letter “A” marks critical alarms, letter “B” marks informational messages. If you can’t find your fault code in the table, contact an authorized service representative.

Code 1B
2B 3B

Message Low supply air flow
Low extract air flow VAV calibration fail

Possible cause
1. Contaminated air filters. 2. Excessive resistance of the air duct system. 3. VAV air flow control selected but pressure sensors are not connected. 4. Supply air fan not working properly.
1. Contaminated air filters. 2. Excessive resistance of ducts. 3. VAV air flow control selected but pressure sensors are not connected. 4. Exhaust air fan not working properly.
Not connected or faulty pressure sensors.

User`s actions
1. Check air filters and replace, if needed. 2. Check air dampers, air inlet/exhaust openings. 3. If VAV air flow control is required, install and connect duct-mounted pressure sensors. If VAV mode is not necessary ­ select CAV or DCV in the settings. 4. Contact authorised service.
1. Check air filters and replace, if needed. 2. Check air dampers, air inlet/exhaust openings. 3. If VAV air flow control is required, install and connect duct-mounted pressure sensors. If VAV mode is not necessary ­ select CAV or DCV in the settings. 4. Contact authorised service.
Check pressure sensors and their measuring range. If a sensor needs to be replaced, contact an authorized service representative.

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Code 4B

Message
Change outdoor air filter

Possible cause Contaminated outdoor air filters.

User`s actions
Replace the air handling unit filters and clear the message.

5B 6B-11B
14B 15B 16B-18B 19B 20B 21B-94B
95B
96B-98B 100B-111B
112B

Change extract air filter
Electric heater off
Service time Evaporator icing Compressor failure Compressor off
Compressor off Compressor failure
Low heat exchanger efficiency
Communication error Compressor failure Water pump/ coil alarm

Contaminated exhaust air filters.
Electrical heater temperature has risen above 70 °C, because: 1. Supply air flow is too low at high heating demand. 2. Electric heater malfunctioning.
Time for annual periodic maintenance.
Defrosting of the evaporator heat exchanger failed.
Compressor is overheated or not running.
Heat pump stopped due to insufficient airflow (see chapter “Heat Pump”).
Heat pump is not running when the outdoor temperature is between 15°C and 20°C (see chapter “Heat Pump”).
Heat pump is not working or is malfunctioning.
1. Heat exchanger efficiency decreased due to unfavourable temperature or humidity conditions. 2. One or two faulty temperature sensors inside the unit. 3. Air mixing between different flows.
Inoperative heat pump’s electronic board or faulty connection.
An alarm signal has been received from the compressor frequency inverter
Signal from the water flow sensor or circulation pump received (see “Water flow monitoring function”).

Replace the air handling unit filters and clear the message. When the heater cools down, it will turn on again automatically. 1 a. Check air filters and air ducts. 1 b. Decrease the desired temperature. 1 c. Increase ventilation intensity. 2. Contact authorised service. Clear the message after performing periodic maintenance. 1. Perform a manual defrost of the heat pump (See 4.7.1.) 2. Contact authorised service. 1. Check the heat pump circuit breakers. 2. Contact authorised service.
Increase airflow setting.
Heat pump will start automatically as soon as the outdoor temperature changes.
1. Check the heat pump circuit breakers. 2. Contact authorised service. 1. Message will disappear automatically when the air temperature or humidity changes and efficiency increases. 2. Check the readings of the temperature sensors. If a sensor(s) needs to be replaced, contact an authorized service representative. 3. Check the unit door for tightness and all gaskets or sealant joints for wear. 1. Check the heat pump circuit breakers. 2. Contact authorised service.
1. Check the heat pump circuit breakers. 2. Contact authorised service.
Check if there is enough water in the system and whether the circulation pump and water mixing valves are working.

113B, 114B

HP exchanger not calibrated

HP heat exchanger calibration not performed or not successful.

Check the unit door for tightness, check for obstacles in the duct system and check whether the air handling unit can reach the air volume specified in COMFORT 1 mode. Repeat calibration manually.

117B-122B Compressor failure

Heat pump is not working or is malfunctioning.

1. Check the heat pump circuit breakers. 2. Contact authorised service.

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Code 123B-125B
127B
1A, 2A 3A, 4A 5A, 6A 7A, 8A 9A, 10A
11A
12A 13A 14A 15A 16A
17A

Message Communication error

Possible cause
No communication with frequency inverter of the heat pump compressor.

Service mode

Temporary special operating mode that can only be activated by a service specialist.

Supply air temp. sensor failure

Not connected or faulty supply air temperature sensor.

Extract air temp. sensor failure

Not connected or faulty extract air temperature sensor.

Outdoor air temp. sensor failure

Not connected or faulty outdoor air temperature sensor.

Exhaust air temp. sensor failure

Not connected or faulty exhaust air temperature sensor.

Water temp. sensor failure

Not connected or faulty return water temperature sensor.

Return water temp. low

Return water temperature of the water heater dropped below the permissible limit.

Internal fire alarm

1. Internal temperature is above 50°C 2. Faulty temperature sensor.

External fire alarm

A fire alarm received from the building’s fire protection system.

External stop
Heat exchanger failure
Heat exchanger icing
Low supply air temperature

The unit stopped by an external device (button, timer, sensor).
1. Rotary heat exchanger not rotating. 2. Temperature sensors malfunctioning.
Freezing is possible at low outdoor temperatures and high indoor humidity.
1. Integrated heaters not working. 2. Additional heating/cooling devices faulty or installed incorrectly. 3. Faulty air temperature sensor.

User`s actions
1. Check the heat pump circuit breakers. 2. Contact authorised service.
If the unit has been previously repaired, contact the person who repaired the unit to make sure that the service mode can be disabled. Service mode is turned off by deleting a message.
Check whether the sensor is connected. If a sensor needs to be replaced, contact an authorized service representative.
Check whether the sensor is connected. If a sensor needs to be replaced, contact an authorized service representative.
Check whether the sensor is connected. If a sensor needs to be replaced, contact an authorized service representative.
Check whether the sensor is connected. If a sensor needs to be replaced, contact an authorized service representative.
Check whether the sensor is connected. If a sensor needs to be replaced, contact an authorized service representative.
Check the condition of a circulation pump and the heating system as well as operation of a mixing valve actuator. Check if hot water is available in the system.
1. Locate the heat source in the ductwork or unit. 2. Contact authorised service.
Once fire alarm is resolved, the unit must be started using a control panel, computer or a smartphone.
Once the additional device is stopped, the unit will operate in normal mode.
1. Check for foreign objects or debris preventing rotation of the rotor drum. Check if the rotor belt is not torn. 2. Contact authorised service.
Check the rotary heat exchanger drive. Check if an external pre-heater is working, if used.
1. Contact authorised service. 2. Contact the company that installed or sold additional heating/cooling equipment. 3. Contact authorised service.

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Code 18A 19A
20A
21A-23A 24A-27A 28A-30A 31A-38A

Message High supply air temperature
Low supply air flow
Low extract air flow
Electric heater overheat
Evaporator air temp. sensor failure Compressor failure Temperature sensor failure

Possible cause 1. Integrated heaters malfunctioning. 2. Additional heating/cooling devices malfunctioning or installed incorrectly. 3. Faulty air temperature sensor.
1. Obstacle in the duct system. 2. VAV air flow control selected but pressure sensors are not connected. 3. Faulty supply air fan.
1. Obstacle in the duct system. 2. VAV air flow control selected but pressure sensors are not connected. 3. Faulty exhaust air fan
Electrical heater temperature has risen above 100°C, because: 1. Supply air flow too low at high heating demand. 2. Power failure during operation of the electric heater; the heater could not cool down. 3. Electric heater malfunctioning.
Air temperature sensor upstream the evaporator not connected or defective. Heat pump is not working or is malfunctioning.
One of the additional zone temperature sensors is faulty or not connected.

User`s actions
1. Contact authorised service. 2. Contact the company that installed or sold additional heating/cooling equipment. 3. Contact authorised service.
1. Check that the air dampers, air intake and exhaust openings are not blocked, check whether the adjustment valves are not completely closed. 2. If VAV air flow control is required, install and connect duct-mounted pressure sensors. If VAV mode is not necessary ­ select CAV or DCV in the settings. 3. Contact authorised service.
1. Check that the air dampers, air intake and exhaust openings are not blocked, check whether the adjustment valves are not completely closed. 2. If VAV air flow control is required, install and connect duct-mounted pressure sensors. If VAV mode is not necessary ­ select CAV or DCV in the settings. 3. Contact authorised service.
1 a. Check the air duct system, air intake and exhaust dampers, fan operation. 1 b. Decrease the desired temperature. 1 c. Increase ventilation intensity. 2. Check whether the unit is connected to the mains. 3. Contact authorised service.
Once the fault is eliminated, reset an overheating protection fuse before restarting the unit. Look for a yellow sticker with the word “Reset” inside the unit that marks an overheating protection fuse.
Contact authorised service.
1. Check the heat pump circuit breakers. 2. Contact authorised service.
1. Check if the sensor is connected. If a sensor needs to be replaced, contact an authorized service representative. 2. Check whether the auxiliary temperature zone parameters are configured correctly (see Chapter “Functions” or “Additional zone control C5” of the Instruction Manual).

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Code

Message

Possible cause

39A,40A

Return water temp. low

Return water temperature of the additional temperature zone water heater dropped below the permissible limit.

41A,42A
43A,44A 45A
84A-89A 90A
91A-98A

Supply air temp. sensor failure
External stop
Water pump/ coil alarm Communication error

Not connected or faulty temperature sensor inside the unit, measuring supply air temperature downstream the heat exchanger.
The unit stopped by an external device connected to the additional zone module.
Signal from the water flow sensor or circulatory pump received (see “Water flow monitoring function”).
Inoperative heat pump’s electronic board or faulty connection.

Service mode

C5 controller blocked.

Controller failure

Faulty controller electronic or no connection between controller electronics.

99A-103A Supply fan failure

Supply air fan or frequency converter not working.

104A-108A Exhaust fan failure

Exhaust air fan or frequency converter not working.

109A-113A Rotor drive failure

Rotary heat exchanger motor or frequency converter not working.

114A-124A 125A,127A
126A

Faulty controller electronic or no Communication error connection between controller
electronics.

Controller failure

Faulty C5 controller.

Controller failure

1. Improperly connected or defective external devices. 2. Faulty C5 controller.

User`s actions
1. Check the condition of a circulation pump and the heating system as well as operation of a heating damper actuator. Check if hot water is in the system. 2. Check that the auxiliary temperature zone parameters are configured correctly (see Chapter “Functions” or “Additional zone control C5” of the Instruction Manual)
Check whether the sensor is connected. If a sensor needs to be replaced, contact an authorized service representative.
Once the additional device is stopped, the unit will run in a normal mode.
Check if there is enough water in the system and whether the circulation pump and water mixing valves are working.
1. Check the heat pump circuit breakers. 2. Contact authorised service.
Contact authorised service.
1. Check if all wires and cables are connected between the unit sections. 2. Contact authorised service.
1. Check if all wires and cables are connected between the unit sections. 2. Check the fan circuit breakers. 3. Contact authorised service.
1. Check if all wires and cables are connected between the unit sections. 2. Check the fan circuit breakers. 3. Contact authorised service.
1. Check if all wires and cables are connected between the unit sections. 2. Contact authorised service.
1. Check if all wires and cables are connected between the unit sections. 2. Contact authorised service.
Contact authorised service.
1. Check connection of external devices or contact the representative of the installer. 2. Contact authorised service.

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ANNEX

ANNEX 1 Rotor cleaning instructions

1

2

3

Loosen the screws on the automation box cover (4 pcs.).

Press the indentations on the sides of the box and release the latches holding the cover. Press two latches on the same side of the box at the same time.

Remove the automation box cover.

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4

5

x 4 x 4

Loosen 8 screws at the corners of the automation panel. Carefully pull the panel to yourself and disconnect cable terminals on the back of the panel. Also disconnect the earthing cable.

Disassemble the main circuit breaker box and disconnect the power cord. Unscrew the cable gland and pull the entire power cord inside the section.

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6

7

Unscrew the brackets at the corners that secure the rotor housing to the top and bottom of the section (brackets may not be used in smaller units).

Disconnect cable connections from the filters, inspection or recirculation section side. Pull the rotor housing out of the section about 10 cm. Pull the cable connections through the gap between the rotor housing and the heat pump refrigerant coil and disconnect them.

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8

9

Pull the rotor completely out of the section.

Rotary heat exchangers shall be cleaned with highpressure washers (pressure up to 10bar). Before washing, the rotor motor and electronics must be additionally protected against moisture or dismantled. Neutral or mild alkaline detergents and disinfection agents must be used for washing. Washing agents may be harmless to the environment, shall not damage aluminium foil and shall be intended for use with high-pressure washers.

10
Install the rotor housing back in the unit section only when it is completely dry. Repeat the steps in reverse order.

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SERVICE AND SUPPORT
LITHUANIA UAB KOMFOVENT Phone: +370 5 200 8000 service@komfovent.com www.komfovent.com
FINLAND Komfovent Oy Muuntotie 1 C1 FI-01 510 Vantaa, Finland Phone: +358 20 730 6190 toimisto@komfovent.com www.komfovent.com
GERMANY Komfovent GmbH Konrad-Zuse-Str. 2a, 42551 Velbert, Deutschland Phone: +49 0 2051 6051180 info@komfovent.de www.komfovent.de
LATVIA SIA Komfovent Bukaisu iela 1, LV-1004 Riga, Latvia Phone: +371 24 66 4433 info.lv@komfovent.com www.komfovent.com
SWEDEN Komfovent AB Ögärdesvägen 12A 433 30 Partille, Sverige Phone: +46 31 487 752 info_se@komfovent.com www.komfovent.se
UNITED KINGDOM Komfovent Ltd Unit C1 The Waterfront Newburn Riverside Newcastle upon Tyne NE15 8NZ, UK Phone: +447983 299 165 steve.mulholland@komfovent.com www.komfovent.com

Documents / Resources

komfovent PRO2 Highly Efficient Air Handling Units [pdf] User Manual PRO2 Highly Efficient Air Handling Units, PRO2, Highly Efficient Air Handling Units, Efficient Air Handling Units, Air Handling Units, Handling Units

References

• User Manual