Komfovent RHP 1300-U Air Handling Unit Instruction Manual

Komfovent RHP 1300-U Air Handling Unit

INTRODUCTION

This Installation Manual is intended for professionals, qualified to install RHP Standard air handling units. Qualified professionals are people with sufficient professional experience and knowledge of ventilation systems and installation thereof, knowledge of electrical safety requirements and having ability to perform work without endangering themselves or others. See the KOMFOVENT website for user manuals.

Safety Requirements

To avoid misunderstandings, read this Instruction Manual carefully before installing the air-handling unit. Only a qualified professional by the manufacturer’s instructions and applicable legal acts and safety requirements may install air-handling units. An air handling unit is an electrical- mechanical device that contains electrical and moving parts, therefore, disregarding instructions of this manual will void the manufacturer’s warranty and may also cause direct damage to property or human health.

• Before starting any tasks, make sure that the unit is unplugged from the mains.
• Use caution when performing work near internal or external heaters as their surfaces may be hot.
• Do not connect the unit to the mains unless all the external assemblies are installed completely.
• Do not connect the unit to the mains in case of any visible damage incurred during transportation.
• Do not leave foreign objects and tools inside the unit.
• It is forbidden to operate air-handling units in areas with potentially explosive atmospheres.
• The heat pump system is filled with refrigerant (F-gas), therefore only qualified refrigeration systems specialists or “Komfovent” representatives can perform any mechanical/electrical works on a heat pump.
• The temperature of evaporating refrigerant is very low and causes severe frostbite in contact with skin, therefore use appropriate safety equipment (gloves, goggles).

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 waste electrical and electronic equipment (EEE). Improper handling of this type of waste could harm 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 equipment for further recycling, contact your city authorities, waste management organisations, approved WEEE scheme or your household waste disposal service.

Unit designs and sizes

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 while replacing it with filtered fresh air from outside. As the outside air is usually colder or warmer than the air within the premises, an integrated recuperator (heat exchanger) collects thermal energy from the indoor air and transfers the majority of it to the supply air.
RHP – air handling units with a rotary heat exchanger and an integrated heat pump. Rotating wheel (rotor) of a rotary heat exchanger collects heat or cold from the indoor air and transfers it to the fresh supply air. Recovered heat/cold capacity is changed by adjusting the rotor speed. When heat recovery is not required, the wheel stops. If a heat exchanger alone is not capable of reaching a desired temperature, an integrated heat pump is activated. If the heating/cooling capacity is still too low, additional heaters or coolers may be activated.1

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 a user- defined supply air temperature when the actual temperature in the premises differs significantly from the temperature set point since this will lead to inefficient operation of a heat exchanger.
RHP STANDARD air handling units are manufactured in different sizes and various air flow ranges (from 400 to 1500 m3/h).

Integrated heat pump

• All RHP Standard air-handling units are equipped with an integrated heat pump operating both in heating and cooling modes.
• A heat pump assembly consists of a piping system containing refrigerant, compressor, two radiators (condenser and evaporator) and separate control electronics:

RHP 400 – RHP 600

RHP 800

RHP 1200 – RHP1600

1. Compressor
2. 4-way valve (SVR)
3. Expansion valve
4. Expansion valve bushing for heating mode
5. Expansion valve bushing for cooling mode
6. Check valve
7. Filter-dryer
8. Sight glass
9. Defrost valve (SVD)
10. High pressure pressostat (HP)
11. Low pressure pressostat (LP)
12. Electronic expansion valve (EXV)
13. High-pressure transmiter (HPT)
14. Low-pressure transmiter (LPT)
15. Discharge gas temperature sensor (DT)
16. Suction gas temperature sensor (ST)
17. Refrigerant coil positioned in the extract airflow
18. Refrigerant coil positioned in the supply airflow

1. Compressor
2. 4-way valve
3. Expansion valve
4. Expansion valve bushing for heating mode
5. Expansion valve bushing for cooling mode
6. Check valve
7. Filter – dryer
8. Sight glass
9. Defrost valve
10. High pressure pressostat
11. Low pressure pressostat
12. Electronic expansion valve (EXV)
13. High-pressure transmiter (HPT)
14. Low-pressure transmiter (LPT)
15. Discharge gas temperature sensor (DT)
16. Suction gas temperature sensor (ST)
17. Refrigerant coil positioned in the extract airflow
18. Refrigerant coil positioned in the supply airflow
19. Buffer tank
20. Liquid receiver
21. Crankcase heating element

The heat pump model and exact refrigerant load capacity is stated on the sticker, which can be found inside of AHU:

A heat pump is activated automatically when a rotary heat exchanger is unable to reach the desired temperature; and is switched off as soon as the desired temperature is reached. Frequent starting and stopping of a heat pump may damage the compressor, therefore, when heating/cooling demand is low, the heat pump will continue running for some time after the set temperature has been reached. In such cases, supplied air may be slightly warmer (in heating mode) or cooler (in cooling mode) than desired; however, the extracted temperature control mode will help to reduce such temperature fluctuations (see “User Instructions”).
A certain airflow is required to ensure proper operation of a heat pump, i. e. to ensure efficient heat exchange and maintain refrigerant pressure within limits. When airflow drops below a minimum limit, a heat pump temporarily stops. Operation is resumed only when airflow increases. The table below shows the minimum airflows required for heat pump operation that must be taken into account when designing the ventilation system and selecting additional functions:

Unit model Minimum airflow

• RHP 400 U-2.8/2.4 250
• RHP 600 U-3.7/3 250
• RHP 600 U-4.4/3.8 400
• RHP 800 U-5.3/4.7 400
• RHP 800 U-6.1/5.8 600
• RHP 1200 U-9.3/7.9 260
• RHP 1600 U-11.2/9.4 340

A heat pump is not operating when the outdoor air temperature is between 15°C and 20°C, as, in this case, the rotary heat exchanger is usually capable of reaching the desired air temperature.
If heating/cooling demand increases when the heat pump is switched off, 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%), the capacity and efficiency of the heat pump decrease, therefore the compressor operates at a critical refrigerant pressure limit. This results in reduced operating life and increased probability of failure.
During winter operation, when the heat pump is in heating mode, the 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 differences upstream and downstream of 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. Integrated electric or auxiliary heaters are switched on to compensate for this change. As soon as the frost melts and pressure decreases, all the power of the heat pump is redirected to the heating process.

Unit types by duct connections

• Depending on the installation and connection of the ducts, the air handling units are divided into:
• Vertical units (marked by the letter V) – when all ducts are connected at the top of the unit.
• Horizontal units (marked by the letter H) – when all ducts are connected on the sides of the unit.
• Universal units (marked by the letter U) – duct connections can be relocated from the sides of the unit to the top and vice versa. Each universal unit has 16 different duct layout options that are easy to change during installation, depending on the intended installation location.

Unit types by inspection sides
Also, each unit may be left or right inspection side1. The inspection side indicates which side of the unit contains the air supply duct to the premises. The exact arrangement of the duct connections for the different inspection sides can be found in section “Unit components”.

Unit Components

• Below are the principal diagrams of air handling units, including the marking of assemblies of the unit and the arrangement of the duct connections.

1. Rotary heat exchanger
2. Supply air fan
3. Extract air fan
4. Electrical heater
5. Supply air refrigerant coil
6. Exhaust air refrigerant coil
7. Outdoor air filter
8. Indoor air filter
9. Condensate drainage
10. Heat pump assembly
11. Mainboard of the C5 control panel
12. The main power cable location

RHP 600 UV

RHP 800 UH

1. Rotary heat exchanger
2. Supply air fan
3. Extract air fan
4. Electrical heater
5. Supply air refrigerant coil
6. Exhaust air refrigerant coil
7. Outdoor air filter
8. Indoor air filter
9. Condensate drainage
10. Heat pump assembly
11. Mainboard of the C5 control panel
12. The main power cable location

RHP 800 UV

1. Rotary heat exchanger
2. Supply air fan
3. Extract air fan
4. Electrical heater
5. Supply air refrigerant coil
6. Exhaust air refrigerant coil
7. Outdoor air filter
8. Indoor air filter
9. Condensate drainage
10. Heat pump assembly
11. Mainboard of the C5 control panel
12. The main power cable location

RHP 1200 UH – RHP 1600 UH

RHP 1200 UV – RHP 1600 UV

1. Rotary heat exchanger
2. Supply air fan
3. Extract air fan
4. Electrical heater
5. Supply air refrigerant coil
6. Exhaust air refrigerant coil
7. Outdoor air filter
8. Indoor air filter
9. Condensate drainage
10. Heat pump assembly
11. The main board of the C5 control panel
12. The main power cable location

UNIT TRANSPORTATION AND STORAGE

Equipment must be transported and stored in the original packaging. During transportation, equipment must be properly secured and further protected against possible mechanical damage, rain or snow. A forklift truck or crane can be used for loading or unloading. For the crane operation, special lashes or ropes must be used to secure them in the designated areas. Ensure that lifting lashes or ropes do not crush or otherwise damage the housing of the unit. We recommend using special belt supports. When lifting and transporting the equipment with a forklift, the forks must be long enough to prevent the unit from being overturned or mechanically damaging its bottom side. Air handling units are heavy, therefore, be careful during lifting, moving or transportation. Use personal protective equipment. Even small units should be transported on a forklift, a trolley or carried by multiple persons.

After delivery of the air handling unit, carefully inspect its packaging for damage. If mechanical or other damage is visible (e.g., wet cardboard packaging), notify the carrier immediately. If the damage is significant, do not accept the unit. Inform the selling company or the representative of UAB KOMFOVENT within three business days about any damage detected during delivery.1
Units should be stored in a clean, dry room at a temperature of 0-40 °C. When selecting a storage location, make sure the unit is not accidentally damaged, that other heavy objects are not loaded on top and dust or moisture does not get inside the unit.

• Air handling units are heavy, therefore care must be taken during lifting, carrying or moving operations.
• Use personal protection equipment, do not stand under a suspended unit or a part thereof.
• Only an employee qualified to operate a forklift truck or crane and familiar with the principles of cargo lifting and safety requirements must perform unloading or lifting operations.
• It must be ensured that the casing is not crushed or otherwise damaged by straps or ropes during lifting operations. Use of special supporting structures (traverses) is recommended.
• When lifting the unit or section thereof, note that their centre of gravity may differ from the geometric center of the load.
• Mounting of separate air handling units in stacks is not allowed unless it’s construction design is intended for such installation.
• Before installation, AHUs must be stored in clean and dry premises in their original packaging. If the unit is installed but not yet in use, all connection openings must be tightly closed and the unit must be additionally protected against environmental influences (dust, rain, cold, etc.).

MECHANICAL INSTALLATION

Requirements for Mounting Location and Installation Base
RHP Standard air handling units are designed for ventilation of medium or large commercial or industrial premises (e.g., stores, offices, hotels, etc.) where standard air temperature and humidity is maintained. These units are not intended for transporting solid particles within air flows. Standard equipment air handling units are intended for indoor installation; and with additional accessories, these units may be mounted outdoors1. Air handling units are designed for ambient temperatures from -30 °C to +40 °C.

• RHP Standard units are not intended for operation in areas with potentially explosive atmospheres.
• Air handling units are not designed for ventilation and dehumidification of wet areas (pools, saunas, car washes, etc.).
• If the AHU is installed in a room with a high humidity level, condensate may form on the walls of the unit at low outdoor temperatures.

An air handling unit must be mounted on a relatively large and sturdy base, based on the weight of the unit and under building regulations. Base must be made of reinforced concrete or metal structures. If the unit is not equipped with adjustable height feet, it must be installed on a flat and level base. Vibration-dampening gaskets must be fitted between the unit and the installation base.

The outdoor air handling units must be fixed to the installation base (e.g., metal angle pieces with rubber vibration-dampening gaskets).
Units installed on such base must be levelled to the horizon – deviations shall not exceed 0.3mm for 1m in the longitudinal direction and 0.5mm for 1m in the transverse direction.

Inspection Area
Based on its type, an air handling unit may be installed indoors or outdoors. When selecting an installation or mounting location, you must foresee sufficient and security-compliant access space for repair and maintenance operations. The unit must be installed in a way to allows partial or full disassembly and removal of assemblies out of the sections, if needed (e.g., in case of complex repairs).

Minimum service area A defines an area that must be free of any stand-alone or immovable devices, equipment, partitions, structure or furniture. This area is sufficient for performing service and filter replacement works. For repair and replacement of components (e.g., removal of rotary heat exchangers), access area equal or wider to the width of the device B shall be ensured in front of the device. Please note that the back wall of units must be removed for any repair works of the heat pump, therefore, the distance between the mounted unit and the wall must be equal to or greater than the distance C. This gap will also help to reduce the transfer of noise and vibrations from the unit to walls, and prevent moisture and mould due to condensation.

RHP

When selecting an installation or mounting location, keep in mind that preventive maintenance works must be performed at least twice a year or more often, therefore, safe and easy access to the unit must be foreseen.

Duct system installation

• The air in and out of the unit flows through the duct system. The duct system should be designed and selected to have low airflow rates and low pressure differentials, ensuring more accurate airflow rates, lower energy consumption, lower noise levels and longer life of the unit.
• Outdoor vents must be installed as far apart as possible on different sides of the building to prevent the exhaust air from returning to the air intakes. Try to install the air intake vents where the outdoor air is the cleanest: do not direct them towards the street, car park or outdoor fireplace. We also recommend installing the air intake vent on the north or east side of the building, where the heat of the sun in summer will not have a significant effect on the supply air temperature.
• It is highly recommended to install unit connecting ducts of the supply inlet and exhaust outlet with a minimum slope on the outside of the premise, to avoid water flowing into the unit in case of rain or snow.

• It is recommended to insulate the ducts in unheated rooms (attic, basement) to avoid heat loss. Insulating the supply air ducts is also recommended if the unit is used for room cooling.
• Circular air ducts are fitted to the unit with self-tapping screws. Different airflow duct positions are marked on the sticker located on the AHU:

• Ducts connecting the unit to the exterior of the building must be insulated (insulation thickness 50– 100 mm) to prevent condensation on cold surfaces.
• Air intake and exhaust ducts must be fitted with air shut-off dampers (electric with actuators) to protect the unit from exposure to climatic conditions when the unit is switched off.
• To minimise AHU noise transferring through the ducts into ventilated areas, sound attenuators must be connected to the unit.
• Duct system elements must have separate brackets and to be mounted in a way that their weight is not shifted to the unit casing.
• Do not drill or screw self-tapping screws into the housing in other than specified locations as it may damage internal wires and tubes.

The diameter of the ducts varies by unit model:

Unit| | | Duct diameter, mm| |
---|---|---|---|---|---
ODA| SUP| ETA| EHA

RHP

Connection of external heating/cooling units

Additionally, you can connect the following to RHP air handling units:

• Water heater.
• Water cooler.
• Direct expansion (DX) cooler/heater.

These accessories are installed in the air supply duct in the premises. All assemblies in the heating or cooling systems must be connected by a qualified specialist.
When connecting the heater/cooler pipes, they must be supported by a box spanner – otherwise, they will be damaged.
If water is used in the heater, for frost protection water temperature sensor (B5), must be installed and fixed with a strap on the return water pipe as close to the heater as possible. Fix the sensor in a way that its metal part has good contact with the surface of the pipe. The sensor must be thermally insulated so that the room temperature does not distort water temperature measurements.

• When operating the unit with negative outdoor temperature, a water-glycol mixture must be used as heat medium in a water heater or cooler or it is necessary to ensure a return water temperature of at least 25 °C.
• Pipework package 2 must include a circulation pump, which circulates the heating/cooling medium through the coil (smaller circuit) and a 3-way mixing valve with a modulated actuator. In cases if 2-way valve is used, additionally it must be installed non-return valves to ensure continuous circulation around a smaller circuit. PPU must be installed as close to the water coil as possible.
• To additionally protect the water heater from freezing, you may also use a capillary thermostat (see section “Electrical installation”) that should be mounted on the surface of the heater.

The heat exchanger coil of DX coolers/heaters is factory-filled with nitrogen gas. Before connecting the heat exchanger coil to the refrigerant system, the nitrogen gas is discharged through a valve which is then cut off and coil connections are soldered to the pipeline.

Connection of a Condensate Drain

Operation of the heat pump causes condensation that accumulates in specially designed condensate trays. Condensate is removed from condensate trays via drainage pipes, therefore a condensate drainage system must be connected. Drainage piping must be mounted with a slope, without narrowing sections or loops preventing water from draining. If such drainage piping is installed outdoors or in unheated premises, it must be adequately insulated or equipped with a heating cable to prevent water from freezing during winter. Drainage piping is connected to the unit with a siphon. Due to negative air pressure in the air-handling unit, water may not drain out of the condensate collection tray by itself. Therefore, it is necessary to connect a proper height siphon or a siphon with a one-way valve to the drain pipe.

• Height H of a siphon without a one-way valve is selected according to static pressure p inside the air handling unit: H [mm] = 25 + p [mm H2O] = 25 + 0.1 x p [Pa]
• The height of a siphon with a non-return valve may be lower; however, it depends on the technical data of the siphon used; therefore, if possible, we recommend choosing its height in the same way as for a siphon without a non-return valve.

Any drainage system cannot be directly connected to the common waste water system in order to protect supply air from contamination with bacteria and odours. Condensate from the air handling unit drainage system shall be collected into a separate container or should be lead to a sewage grille without any direct contact: do not connect drain directly to sewer pipe and do not immerse it into water. Condensate collection location must be easily accessible for cleaning and disinfection.

Outdoor Units
RHP 800 – 1200 – 1600 air handling units are suitable for outdoor installation1. Units for outdoor installation must be additionally protected against environmental effects by installing a protective roof and exhaust air hoods. Air dampers must be mounted on air duct connections on the air intake and exhaust sides. If the outdoor unit will be switched off during the cold season, supply and extract air ducts (on the indoor side) must be fitted with additional air shut-off dampers. These should prevent warm indoor air from circulating inside the unit when it is stopped to avoid condensation, which may be detrimental to electronic components. If air damper actuators are used which are not intended for outdoor installation, they must be additionally protected against rain and snow with covers or boxes. Air handling units, when possible, should be installed near the walls for protection against wind loads.

1. air handling unit,
2. air intake hood,
3. roof,
4. boxes or covers for air damper actuators,
5. air shut-off dampers,
6. additional air dampers for protection of a stopped unit

• The outdoor units with water drainage pipes must be additionally protected against freezing, for example, with electric heating cables for drainage pipes.
• Connections of outdoor units must be additionally sealed (the sealant is not included).
• Air intake and outlet hoods must be installed as far apart as possible (for example by installing additional duct segments between AHU and hood), to prevent the exhaust air from returning to the air intakes.
• Air damper actuators of the outdoor mounted AHU must be protected from rain and snow. Actuators must be covered by installing additional protective boxes or hoods.

TECHNICAL INFORMATION

Unit

| ****

Operating current

| ****

Supply voltage

| Electric heater capacity| ****

Power of fans

| ****

Weight

| Heat pump
---|---|---|---|---|---|---
Heater capacity| Cooling capacity| Refrige- rant| Quantity of refrigerant
A| V| kW| W| kg| kW| kW| –| kg

RHP

UNIT DIMENSIONS

Horizontal units

Unit

| Inspection- on side| Dimensions, mm
---|---|---
Width B/B1| Length, L/L1| Height, H/H1| h1| h2| h3| h4| h5| b1| b2| b3| b4

RHP

600 UH| Right R1| 650| 1400/1254| 895/805| 292| 195| 200| 195| 90| 195| 438| 410| 433
---|---|---|---|---|---|---|---|---|---|---|---|---|---
Left L1| 650| 1400/1254| 895/805| 200| 195| 292| 195| 90| 410| 433| 195| 438
800 UH| Right R1| 910| 1648/1505| 986/905| 242| 213| 270| 243| 81| 252| 640| 645| 250
Left L1| 910| 1648/1505| 986/905| 270| 243| 242| 213| 81| 645| 250| 252| 640
1200 UH| Right R1| 905| 1605/1505| 995/905| 245| 245| 240| 215| 90| 595| 250| 240| 635
Left L1| 905| 1605/1505| 995/905| 240| 215| 245| 245| 90| 240| 635| 595| 250
1600 UH| Right R1| 905| 1605/1505| 995/905| 245| 245| 240| 215| 90| 595| 250| 240| 635
Left L1| 905| 1605/1505| 995/905| 240| 215| 245| 245| 90| 240| 635| 595| 250

Vertical units

Unit

| Inspection- on side| Dimensions, mm
---|---|---
Width B/B1| Length, L/L1| Height, H/H1| l1| l2| l3| l4| h5| b1| b2| b3| b4

RHP

400 V| Right R1| 618| 712| 919/892| 130| 129| 135| 212| 123| 168| 417| 168| 408
---|---|---|---|---|---|---|---|---|---|---|---|---|---
600 UV| Right R1| 650| 1254| 878/805| 188| 188| 200| 200| 90| 188| 456| 188| 456
Left L1| 650| 1254| 878/805| 200| 200| 188| 188| 90| 188| 456| 188| 456
800 UV| Right R1| 910| 1505| 976/905| 238| 238| 238| 238| 81| 232| 594| 238| 650
Left L1| 910| 1505| 976/905| 238| 238| 238| 238| 81| 238| 650| 232| 594
1200 UV| Right R1| 905| 1505| 955/905| 240| 240| 240| 240| 90| 240| 650| 230| 595
Left L1| 905| 1505| 955/905| 240| 240| 240| 240| 90| 230| 595| 240| 650
1600 UV| Right R1| 905| 1505| 955/905| 240| 240| 240| 240| 90| 240| 650| 230| 595
Left L1| 905| 1505| 955/905| 240| 240| 240| 240| 90| 230| 595| 240| 650

ELECTRICAL INSTALLATION
Only qualified professionals may perform electrical installation works under the manufacturer’s instructions and applicable legal acts and safety requirements. Before installation of any electrical components:

• Make sure the unit is unplugged from the mains.
• If the unit has been standing in an unheated room for a long time, make sure there is no condensation inside and check if contacts and electronic parts of the connectors are not damaged by moisture.
• Inspect the power cable ant other wiring for damage in insulation.
• Locate the wiring diagram for your unit according to the unit type.

Requirements for Electrical Connection

• Connect the unit only to a proper power outlet with protective earthing. Earthing must be installed according to the EN61557, BS 7671 requirements.
• It is recommended to connect AHU to the mains via automatic circuit breaker with 30 mA current leakage protection (type B or B+).
• Control cables should be installed at least 20 cm away from power cables to reduce the possibility of electrical interference.
• All external electrical elements must be connected strictly according to the wiring diagram of the unit.
• Do not disconnect the connectors by pulling wires or cables.

Lead-in cable diameter depends on a maximum current specified in the technical data print-out of the specific unit.

Connection of Electrical Components
All internal and external elements of the unit are connected to the main board of the C5 control panel (marked as “RG1” in wiring diagrams), located inside the unit. In some units, you will need to unscrew the metal cover to access the control panel.
You can see the exact location of the C5 controller in the unit in section “Unit components”

1. control panel connection,
2. Intranet or Internet connection,
3. inner connections of components,
4. terminals for external components

Terminals for the external elements of the controller board are numbered and are used only to connect external components.
These may remain empty if no additional features are required.

Total power of all external devices with 24 V supply voltage shall not exceed 25 W.

• Modbus RS485 (1-3) – data cable connection for controlling the unit from a building management system via Modbus RTU protocol. Also these terminals can be used for additional heating/cooling zone control module connection (see „Additional zone control installation manual“).
• External control (4–8) – terminals for controlling specific functions of the unit via external contacts which are connected to a common terminal 8. These include thermostats, switches, motion sensors and other devices with normally open or closed contacts.
• Activated functions will operate as long as those contacts are connected.
• Terminal 4 is used to switch between heating and cooling modes, if a combined water heater is used (after terminals are connected, the water valve actuator and pump will be controlled according to the cooling signal. For example, a thermostat can be connected here to close terminals when cold water circulates in the system).
• Closing contacts 5 and 8 will stop the unit.
• Fire alarm requires a normally closed contact (NC), therefore, a jumper is connected between terminals 6 and 8, instead of which, building fire system can be connected. When the contact is disconnected, the unit stops, fans speed up (according to the order) and a fire alarm message is displayed.
• Terminal 7 actives an “Override” ventilation mode (OVR). This mode has priority over other AHU functions and may be activated even when the unit is stopped (i.e. to start the unit by closing contacts). OVR function settings are set via the control panel or computer. This function is active as long as terminals are closed.
• B5 (9–10) – when a water heater is installed, this terminal is used for connecting a return water temperature sensor (NTC 10kΩ) which protects against freezing.

• B1 (11–12) – terminal for a supply air temperature sensor (NTC 10kΩ) for controlling air temperature.

• For the most accurate temperature measurement, sensor in a duct must be installed after all heating/cooling devices at least two duct diameters away from the nearest coil.

• TG3 (13–14) – for connecting control signal (0..10 V) of an external humidifier or dehumidifier, if activated.
• TG2 (15–17) – power supply (24 V AC) and control signal (0..10 V) for a water cooler mixing valve actuator. If a DX unit is installed (controlled by a modulated signal), DX unit control signal is connected to these terminals and water cooling is disabled.
• TG1 (18–20) – power supply (24 V AC) and control signal (0..10 V) for a water heater mixing valve actuator. If a combined water heater/cooler is used, valve actuator will be controlled by a heating or cooling signal (whichever is supplied).
• S2 (21–22) – 230 V AC supply voltage for a cold water circulation pump, which is used with external water cooler coil and is activated when cooling is needed. Max 1 A.
• S1 (23–24) – 230 V AC supply voltage for a hot water circulation pump, which is used with external water heater coil and is activated when heating is needed. Max 1 A.
• B8/B9 (25–30) – terminals for air quality and humidity sensors, which are used for the following functions (see “User Manual”):
• Air quality control (AQC).
• Operation on demand (OOD).
• Humidity control (HUM).
• These functions may be controlled via the following type sensors (sensor type may be changed only by an authorised service representative):
• Carbon dioxide CO2 (default setting) – range 0..2000 ppm.
• Air quality VOC (Volatile organic compound) – range 0..100 %.
• Relative humidity RH – range 0..100 % RH.
• Temperature TMP – range 0..50 °C.
• B6/B7 (31–36) – when a VAV airflow control method is used (see “User Manual”), optional pressure sensors must be installed and connected in the ducts. Follow the manufacturer’s instructions for installation of VAV pressure sensors. Also, these terminals are used for DCV airflow control when a separate 0…10 V signal can be used to adjust the ventilation intensity (see “User Manual”).
• FG1 (37–39) – terminals used to connect air damper actuators. These terminals may also be used for connecting 24 V AC power supply actuators with or without a spring return.
• Indication (40–42) – terminals are used when a normally open (NO) contact is necessary for operation status or fault indication.
• Cooling control (43–46) – digital normally open (NO) outputs for controlling direct expansion (DX) coolers/heaters. The purpose of outputs differs depending on the type of DX device control ordered or programmed in the control panel1:
• Stepping control of start/stop type DX cooling devices – each of the 3 outputs is activated one after the other, when the power of the previous stage is insufficient, with 5 min. delay.
• Stepping control of start/stop type reversible (cooling/heating) DX devices – DX1 and DX2 outputs are activated one after the other, when the power of the previous stage is insufficient, with 5 min. delay. DX3 output is used for switching DX devices between cooling and heating modes.
• If a DX device is controlled by a modulated signal (0..10 V), digital outputs are used for starting a DX unit and changing operation modes thereof: DX1 – start signal, DX2 – cooling, DX3 – heating. Power control signal for this type of the DX unit is connected to TG2 terminals.
• Water pump/coil alarm (47–48) – here you can connect signal for indication of water pump faults (if this function is available on the pump); if the pump fails, the air handling unit is stopped. Also these terminals can be used for additional frost protection of
• water heater coil, by connecting here capillary thermostat, which is mounted on the surface of the coil.
• All wires to be connected to the main board of the control panel shall be pulled through sleeves (at the top of the airhandling unit). Grommets are fastened to ensure tightness.

Control Panel Installation

The control panel must be installed in a room with:

• Ambient temperature – 0..40 °C;
• Relative humidity – 20..80 %;
• Guaranteed protection against accidental water drops.

Control panel can be mounted in a concealed mounting box or directly on the wall (screws supplied with the panel). You can also use magnets (on the back surface) to attach the panel to metal surfaces (i.e. on the door of the unit).
Do not use any other type or size screws but those that are supplied for control panel mounting. Wrong screws may cause damage to a circuit board.
Control panel is supplied with a 10 m cable. If this cable is too short, you can replace it with a 4 × 0.22 mm cable, up to 150 m long.

If the DX device was not predefined in the controller software, these outputs will be inactive.

Control panel cable shall be installed further away from other power supply cables or high voltage electrical equipment (electrical enclosure, electrical water heating boiler, air conditioning unit, etc.). The cable can be pulled through openings in the back or bottom part of the control panel (follow the installation instructions provided with the control panel). Wire to the board of the C5 control panel must be connected to a dedicated slot or terminal of external components (see Fig. 19).

• Do not use sharp tools for pinning contacts in the control panel (e.g., screwdriver). Please use a pencil or a ballpoint pen.

Connecting the Unit to the Local Computer Network or the Internet
Your AHU may be controlled not only with a control panel, but also with a computer or smart phone. For this reason the unit must be connected to the internal computer network or the Internet. In case of a computer, the unit is controlled via a web browser, and in case of a smart phone – via the Komfovent app. Use CAT5 type cable to connect your AHU to the computer network (RJ45 connection; see Fig. 14). The total cable length between the unit and the network router must not exceed 100 metres. By default, the IP address of your air handling unit is 192.168.0.50, however it can be changed (if necessary) according to the local network parameters. IP address can be found and changed in the control panel.

An air handling unit connected to a network router can be controlled by a computer via wireless connection (Wi-Fi). The unit may also be controlled wirelessly in a local network using a smart phone with the Komfovent app. Once the unit is connected to the network router, you should assign a free IP address on the local network. When connecting your computer directly to the unit, open the network settings and manually assign an IP address, the last number of which would be different from the unit’s IP address (for example, if the unit’s IP address is 192.168.0.50, assign the address 192.168.0.70 to the computer). Enter the subnet mask: 255.255.0.0.

In order to control your AHU over the Internet, connect it to the network router which has access to the Internet. Follow the router manual to configure port forwarding to the unit IP address. Depending on whether you will use your computer or smart phone with the Komfovent app to control your AHU, you will also need to enter a corresponding port number to the router. For control via your computer use the port 80, and for control via your smart phone use the port 502. Once a computer or smart phone is connected to the Internet, enter an external router IP address and set port number to your web browser or the Komfovent app to access the AHU user interface (for more information on control with a computer or smart phone see “User Manual”).

Connection to the local computer network

Connection via the Internet

FILTERS
Air filters are intended for removing dust, bacteria and other fine particles from the supplied and extracted air. RHP Standard air handling units use compact filters. Filters are made of synthetic fabric and can have different filtration classes1, i.e., intended for removing particles of different sizes. In general, supply air flow is equipped with better filtering class filters than extracted air since the cleaned outdoor air is supplied to the premises.
The contamination of the filters is monitored by pressure switches installed inside the unit and set to a certain differential pressure, based on the type of filter used. If filters of other manufacturer or different filtration class is used, the range of the pressure switches must be set correctly after their replacement. The pressure switches are set by removing the top cover and turning the knob to the necessary limit of differential pressure. After the filter becomes dirty and the differential pressure value is reached, a message will be displayed on the control panel or computer screen.

Filters

RHP

COMMISSIONING AND INSPECTION OF THE UNIT

Before switching on the device, check for foreign objects, debris or tools inside the unit. Make sure that air filters are installed and condensate drainage is connected (if necessary), fill the siphon with water. Make sure that the ductwork is free from obstructions such as fully closed diffusers or adjustment valves or blocked external air intake grilles. Inspect the heat pump assembly. Check for 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.

• You may start your AHU only when it is fully installed, ducts and external electrical elements are connected.
• Do not start the unit without air ducts connected. This may distort air volume measurements required for stable operation of the fans.
• Do not use the unit with a temporary electrical power supply as unstable power can damage the electronic components.

See the KOMFOVENT website for user manuals.
The unit is controlled via a control panel or a computer. The unit is supplied with the following operation modes that may be used immediately after installation or different ventilation settings may be selected.

• COMFORT 1 – maximum ventilation intensity (100%), desired air temperature – 21°C.
• COMFORT 2 – average ventilation intensity (50%), desired air temperature – 21°C.
• ECONOMY 1 – low ventilation intensity (33%), desired air temperature – 20 °C.
• ECONOMY 2 – minimum ventilation intensity (20%), desired air temperature – 19°C.
• SPECIAL – maximum ventilation intensity (100%), desired air temperature – 21°C.

This mode may also be used to disable heating/cooling and other functions.

Control panel C5.11
C5.1 is control panel with coloured touch-screen for remote control of your air handling unit. This control panel is designed for indication and changing of various functions and settings of the unit.

If the unit is connected to the mains, the control panel will display a home screen or a screen saver that you can switch off with a single tap.

To start an air handling unit or change a ventilation mode:

• During the first minute of starting the unit, the unit automation checks the settings, automation components and opens air dampers. Later, a signal is sent to fans and a heat exchanger, and the unit starts operating at a selected ventilation mode.

• The first time you turn on your air handling unit, you will have to perform calibration of a HP evaporator1 (if not performed during installation). This calibration is necessary for proper operation of the antifreeze prevention function.

• 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.

• To change the ventilation mode settings: select a desired mode and set a desired air volume or temperature with the arrows.

To turn of the AHU and return to a home screen

Starting the Unit With a Computer
If the unit was ordered without a control panel or it is not used, you can start it with your computer. In this case the unit is controlled via a web browser. Connect your computer directly to the AHU or to the same computer network as described in Chapter 6.4. Run the Internet browser on the computer and disable the use of all Proxy servers that may block the connection in the settings. In the web browser address bar, enter the IP address of the unit:

• If you login attempt is successful, “Overview” window is opened.

To start the unit and change the ventilation mode settings:

1. Press button “Modes”.
2. Select a desired ventilation mode from the list.
3. Enter desired air flow and temperature in the selected mode settings.
4. Press “Save” button at the bottom of the screen.

• You can stop the unit by pressing ON/OFF button in the “Overview” window.

Quick Inspection
The first time you start your device, make sure that:

All air filters are installed

|  |  |

Air dampers fully open

|  |  |
There are no unusual noise or vibrations|  |  |
Changing the ventilation modes changes the fan speed|  |  |
The unit is airtight without gaps or air leakage|  |  |

Heating/cooling devices are working

|  |  |
Connected external devices are working|  |  |
The condensate easily flows from the unit and the drainage piping is water- tight|  |  |
Check for leaks in the heat pump piping system|  |  |
Check if there is no moisture in the refrigerant system|  |  |
The heat pump compressor operates properly, without any extraneous noise and vibrations.|  |  |
HP heat exchanger calibration performed (only in HP units)|  |  |

Other comments:

|  |  |

• Installer…………………………………….
• Company…………………………………..
• Tel. No………………………………………
• Date………………………………………….
• Signature…………………………………..

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
• Bukaišu iela 1, LV-1004 Riga, Latvia
• Phone: +371 24 66 4433
• info.lv@komfovent.com
• www.komfovent.com

Vidzemes filiāle

• Alejas iela 12A, LV-4219 Valmiermuiža,
• Valmieras pagasts, Burtnieku novads
• Phone: +371 29 358 145
• kristaps.zaicevs@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

PARTNERS

J. PICHLER Gesellschaft m. b. H.

• www.pichlerluft.at

Ventilair group ACB Airconditioning

• www.ventilairgroup.com
• www.acbairco.be

REKUVENT s.r.o.

• www.rekuvent.cz

References

• Domov - Agregat
• Airvent Légtechnikai Zrt.
• Solutions de ventilation et de traitement d’air | ATIB
• Blikk - og tækniþjónustan ehf. - Heim
• BVT | BVT
• Clima Direct: making it comfortable
• CLIMAIR
• Elta Ireland | Air Movement & Air Quality
• GEVENT Magyarország
• Hitatækni | Sérþekking á sviði loftræsinga
• ICARIA VMC
• Home | Komfovent
• Startseite | Komfovent
• Hemsida | Komfovent
• Welcome to Lindab Ireland
• Merkapt Zrt. – Épületgépészeti kereskedések
• Sistemi za klimatizaciju, grijanje, rashladna tehnika i regulacija | Microclima d.o.o.
• Nordisk Ventilator AB |
• Velkommen hos Øland A/S
• Home Pichler - Pichlerluft - Wohnraumlüftung, Luftförderung, Luftführung, Luftverteilung
• Rekuvent | Rekuperace, vzduchotechnika, řízené větrání
• SUDCLIMATAIR - Votre Air, Notre Expertise
• Totalleverandør av kjølemaskiner og varmepumper > Thermo Control
• TZB produkt
• Vecon
• VENTIA | Strona główna
• Ventilution AS
• Hjem - Ventistål
• Vind hier luchtbehandeling voor uw bedrijf - Vortvent
• Ihr Spezialist für Lüftung & Luftfiltration - WESCO

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