BLAUBERG KOMFORT EC S(B)200/250(-E) Air Handling Unit User's Manual

Introduction

This user's manual is a primary operating document for technical, maintenance, and operating staff. It contains information about the purpose, technical details, operating principle, design, and installation of the KOMFORT EC S(B)200/250(-E) unit and all its modifications. Technical and maintenance staff must possess theoretical and practical training in ventilation systems and adhere to workplace safety rules, construction norms, and standards applicable in their region.

Image: Depicts two BLAUBERG KOMFORT EC air handling units.

The following models are covered: KOMFORT EC S200, KOMFORT EC S200-E, KOMFORT EC SB200, KOMFORT EC SB200-E, KOMFORT EC S250, KOMFORT EC S250-E, KOMFORT EC SB250, KOMFORT EC SB250-E.

Contents

This manual covers the following topics:

• Safety requirements
• Purpose
• Delivery set
• Designation key
• Technical data
• Design and operating principle
• Mounting and set-up
• Connection to power mains
• Technical maintenance
• Troubleshooting
• Storage and transportation regulations
• Manufacturer's warranty
• Certificate of acceptance
• Seller information
• Installation certificate
• Warranty card

Safety Requirements

This unit is not intended for use by persons (including children) with reduced physical, sensory, or mental capabilities, or lack of experience and knowledge, unless they have been given supervision or instruction by a responsible person. Children should be supervised to ensure they do not play with the unit. The appliance may be used by children aged 8 and above and persons with reduced capabilities if supervised and instructed on safe use, understanding the hazards. Cleaning and maintenance by children must be supervised. Children must not play with the appliance.

If the supply cord is damaged, it must be replaced by the manufacturer, its service agent, or similarly qualified persons to avoid a safety hazard.

Ensure the unit is switched off from the supply mains before removing any guards.

Precautions must be taken to avoid the back-flow of gases into the room from open flues of gas or other fuel-burning appliances. The appliance may adversely affect the safe operation of such appliances due to back-flow of combustion gases, potentially causing carbon monoxide poisoning. After installation, a competent person should test the operation of flued gas appliances to ensure no back-flow occurs.

All operations must be performed by qualified, trained personnel. Do not attempt installation, connection, or maintenance without special knowledge. Disconnect power supply before any operations. User's manual requirements and all applicable local/national construction, electrical, and technical norms must be observed. Disconnect power before any connection, servicing, maintenance, or repair. Connection to power mains requires a qualified electrician. Check the unit for visible damage before installation; casing internals must be free of foreign objects. Avoid casing compression during mounting, as it can cause motor jam and noise. Misuse and unauthorized modifications are prohibited. Do not expose the unit to adverse atmospheric agents. Transported air must be free of dust, impurities, sticky substances, or fibrous materials. Do not use in hazardous or explosive environments. Do not block intake or extract vents. Do not sit on the unit or place objects on it. Never touch the unit with wet or damp hands or when barefoot.

Disposal: The product must be disposed of separately at the end of its service life. Do not dispose of the unit as unsorted domestic waste.

Purpose

The unit ensures continuous mechanical air exchange in houses, offices, hotels, cafes, conference halls, and other utility and public spaces. It recovers heat energy from extracted air to warm filtered intake air. It is not intended for swimming pools, saunas, greenhouses, or other high-humidity spaces. The unit is an important element of energy-efficient premises due to its heating energy saving capabilities. It is a component part and not designed for stand-alone operation, rated for continuous use. Transported air must not contain flammable or explosive mixtures, chemical vapors, sticky substances, fibrous materials, coarse dust, soot, oil particles, or environments conducive to hazardous substances.

Delivery Set

The standard delivery set includes:

• Air handling unit (1 pc.)
• User's manual (1 pc.)
• Control panel user's manual (1 pc.)
• Control panel (1 pc.)
• Drain pipe (1 pc.)
• Mounting bracket (1 pc.)
• F7 label (1 pc.)
• Packing box (1 pc.)

*The control panel is not included in the delivery set for units equipped with an S21 controller.

Designation Key

The unit designation follows a specific format:

KOMFORT EC S(B)200/250(-E)

• KOMFORT: Series name.
• EC: Motor type (electronically commutated).
• S: Spigot orientation (vertical).
• B: Additional component (bypass).
• 200/250: Rated air flow in m³/h.
• E: Heat exchanger type (energy recovery air handling unit). If absent, it's a heat recovery air handling unit.
• S11, S14, S19, S21: Control system designation.

Technical Data

The unit is designed for indoor use with ambient temperatures from +1°C to +40°C and relative humidity up to 60% without condensation. To prevent condensation on internal walls, the casing surface temperature should be 2-3°C above the dew point of the transported air. Operate continuously; reduce airflow to a minimum (20%) when ventilation is not necessary. The unit is rated as Class I electrical appliance. Hazardous parts access and water ingress protection rating: IP20 for the unit connected to air ducts, IP44 for unit motors. Unit design is subject to improvement.

Diagrams: Show overall and connecting dimensions for KOMFORT EC S(B)200(-E) and KOMFORT EC S(B)250(-E) units, including height, width, depth, and air duct connection diameters.

Design and Operating Principle

The unit casing is made of painted and galvanized steel sheets with a heat- and sound-insulating mineral wool layer. Removable front panels allow filter replacement, and the service side can be changed.

In KOMFORT EC S(B)200/250 units, temperature differences between supply and extract air cause condensate, collected in a drain pan and removed via a drain pipe. KOMFORT EC S(B)200/250-E units with enthalpy heat exchangers do not require condensate drainage.

Diagram for KOMFORT EC S(B)200(-E) unit with numbered components: 1 - bypass damper (for SB models), 2 - supply fan, 3 - FS2 humidity sensor (optional), 4 - control unit, 5 - extract fan, 6 - supply filter, 7 - extract filter, 8 - freeze protection sensor, 9 - counter-flow heat exchanger, 10 - drain pan, 11 - drain pipe, 12 - detachable service plates for filter maintenance.

Diagram for KOMFORT EC S(B)250(-E) unit with numbered components: 1 - terminal box, 2 - bypass damper (for SB models), 3 - supply fan, 4 - FS2 humidity sensor (optional), 5 - extract fan, 6 - internal control unit, 7 - supply filter, 8 - extract filter, 9 - supply filter, 10 - counter-flow heat exchanger, 11 - freeze protection sensor, 12 - drain pan, 13 - drain pipe, 14 - SETUP MODE button (for S21 automation), 15 - detachable service plates for filter maintenance.

Optional Accessories:

• Humidity sensor: Maintains set indoor humidity by adjusting fan speed.
• CO₂ sensor: Controls fan performance based on room CO₂ concentration for energy saving.
• VOC sensor: Assesses air saturation with contaminants, enabling on-demand ventilation.
• EVH duct heater: Preheats intake air to prevent heat exchanger freezing.
• ENH duct reheater: Maintains set room temperature.

Compatibility Table of Optional Equipment and Unit Models

A table details the compatibility of various sensors and heaters with different KOMFORT EC S(B) models and control systems (S11, S14, S19, S21). A '+' indicates compatibility, while '-' indicates no compatibility.

Unit Operation Modes

• Heat Recovery mode: Air from the room is filtered, passes through the heat exchanger, and is exhausted. Outside air is filtered, passes through the heat exchanger, and is supplied to the room. Heat energy is transferred from warm extract air to cold supply air, minimizing heat loss.
• Freeze Protection: Activated when exhaust air temperature drops below a threshold (+3°C or +5°C depending on preheating). The unit has a Frost Protection mode based on temperature sensor readings. In case of freezing danger, the supply fan may be turned off, or the bypass or electric preheater may be used, depending on the control system.
• Summer Cooling mode (ventilation): Extract air bypasses the heat exchanger, and the bypass damper is opened. Intake air temperature remains constant.

Air Flow Direction

Diagrams illustrate air flow paths for Heat Recovery, Freeze Protection (Supply fan off), and Summer Cooling (Bypass duct opened) modes for both KOMFORT EC S(B)200(-E) and KOMFORT EC S(B)250(-E) units. The diagrams show intake air, extract air, supply air, and exhaust air directions.

Mounting and Set-up

General Installation: Connect straight air duct sections to unit spigots. Minimum straight duct length: 1 diameter on intake, 3 diameters on outlet. Secure flexible ducts with worming clamps. Protect unit parts from foreign objects if ducts are short. Spigots may be covered with protective grilles (mesh width max 12.5 mm) to prevent access to the fan. Ensure convenient access for maintenance. Mount the unit on a plane wall; uneven surfaces can cause distortion and operational disturbance.

Humidity Sensor Mounting: The FS2 humidity sensor must be installed in the air duct before unit mounting. Sequence: Remove panel screws, place sensor in mount, connect sensor connector to the control unit connector.

Diagrams show duct connection with clamps and the humidity sensor mounting process.

Service Side Change

The service side can be changed by unscrewing and repositioning the front and back panels. A label indicating filter type and air flow direction is provided for removable plates on KOMFORT EC S(B)250(-E) units.

Diagrams illustrate the process of changing the service side panels.

Unit Installation

Duct Connection: To optimize performance and minimize turbulence, connect straight air duct sections to the unit spigots. Minimum straight duct length: 1 air duct diameter on the intake side, 3 air duct diameters on the outlet side. Push air ducts onto flanges until stop. Flexible ducts must be fixed rigidly with a metal worming clamp.

Protection: If air ducts are too short or not connected, protect unit parts from foreign objects. To prevent unauthorized access to the fan, spigots can be covered with a protective grille with a mesh width not exceeding 12.5 mm.

Access: Ensure convenient access for subsequent maintenance and repair.

Mounting Surface: The unit must be mounted on a plane wall. Mounting on an uneven surface can lead to casing distortion and operational disturbance.

Unit Wall Mounting: Dowels and screws are not included and must be purchased separately. Select dowels based on mounting surface material and unit weight. Install dowels, fix wall bracket, and hang the unit.

Unit Floor Mounting: Install the unit on pre-mounted floor supports (minimum 150 mm height) to ensure sufficient access for the drain pipe connection and condensate drain system.

Diagrams illustrate duct connection, wall mounting, and floor mounting requirements.

Condensate Drainage

Condensate drainage is required for KOMFORT EC S(B)200/250 units. The drain pipe hole is at the bottom. Remove the plug, open the service panel, install the drain pipe from the delivery set, and connect it to the sewage system using an SFK 20x32-32 U-trap kit (sold separately). The drain pipe must have a minimum slope of 3°.

Diagram shows the condensate drainage setup with drain pipe, U-trap, and sewage system connection, indicating a minimum 3° slope.

Connection to Power Mains

Safety Warning: POWER OFF THE POWER SUPPLY PRIOR TO ANY OPERATIONS. THE UNIT MUST BE CONNECTED BY A QUALIFIED ELECTRICIAN. RATED ELECTRICAL PARAMETERS ARE ON THE MANUFACTURER'S LABEL. TAMPERING WITH INTERNAL CONNECTIONS IS PROHIBITED AND VOIDS THE WARRANTY.

The unit connects to 230 V/50 (60) Hz power mains. The external power input must include an automatic circuit breaker in the stationary wiring for overload or short-circuit protection. The circuit breaker must be easily accessible for emergency shutdown. The trip current of the breaker should exceed the unit's maximum current consumption (refer to technical data). The automatic circuit breaker is not included in the delivery set.

Access to Control Unit and Terminal Box

Access to Control Unit: Unscrew and remove the front panel on the service side. Remove the heat exchanger. Remove screws retaining the electric mounting plate and push it down. For KOMFORT EC S(B)200(-E) models, terminal blocks X1 and X2 are on the internal control unit's mounting plate. For KOMFORT EC S(B)250(-E) models, terminal block X1 is on the electric mounting plate.

Access to Terminal Box (KOMFORT EC S(B)250(-E) only): The X2 terminal block is in an external terminal box on the unit casing. Remove terminal box screws and lid to access it.

External Wiring Diagrams

Diagrams provide external wiring schematics for various KOMFORT EC S(B) unit configurations (S14, S250-E S14, S250-E S19, S250-E S21). These diagrams illustrate connections for power input (230 VAC), control panel (P1), sensors (humidity, CO2), actuators (damper SM1, SM2), fire alarm panel (PK1), kitchen hood contact (KH), CCU control, and Boost contacts to terminal blocks X1 and X2.

Tables accompanying the diagrams list designations (e.g., SM1*, P1*), names (e.g., Supply air damper actuator, External control panel), models, and wire specifications (type and maximum cable length).

Safety Note: ⚠ ELECTRIC SHOCK HAZARD!

Technical Maintenance

The unit requires technical maintenance 3-4 times per year, including general cleaning and specific operations:

1. Filter Maintenance (3-4 times/year): Dirty filters increase air resistance and reduce airflow. Clean F7 filters with a vacuum cleaner; replace after two cleanings. Clean G4 filters by rinsing with water and allowing them to dry; reassemble.
2. Heat Exchanger Maintenance (once/year): Regular cleaning maintains heat recovery efficiency. Perform wet cleaning with warm detergent solution or dry cleaning with a vacuum cleaner.
3. Fan Maintenance (once/year): Clean fans with a soft brush or cloth to remove dust accumulation. Do not use water, aggressive solvents, or sharp objects.
4. Condensate Drainage System Maintenance (once/year): Check the drain line for clogging by pouring water into the drain pan. Clean the U-trap and drain pipe if necessary.
5. Air Duct System Maintenance (every 5 years): Regular cleaning or replacement of air ducts may be required to maintain unit capacity.
6. Control Unit Maintenance (if necessary): Must be performed by a qualified expert familiar with electrical installations up to 1000 V.

Diagrams show access to filters and the heat exchanger for maintenance.

Troubleshooting

General Warning: IF UNIDENTIFIED NOISES, ODOURS, DEFORMATION, VIBRATION, TERMINATION OF AIR SUPPLY/EXTRACTION, OR REDUCED SYSTEM PERFORMANCE OCCUR, IMMEDIATELY DISCONNECT THE UNIT FROM POWER SUPPLY AND CONTACT THE SELLER. DIAGNOSTICS MUST BE CARRIED OUT BY QUALIFIED SPECIALISTS.

If troubleshooting steps fail, contact the Seller. For undescribed faults, contact the Seller for further information.

Storage and Transportation Regulations

Store the unit in its original packaging in a dry, ventilated premise with temperatures between +5°C and +40°C and relative humidity up to 70%. The storage environment must not contain aggressive vapors or chemical mixtures that cause corrosion. Use suitable hoisting machinery for handling to prevent damage. Follow cargo handling requirements. Transport the unit in its original packaging by any mode, ensuring protection against precipitation and mechanical damage. Transport only in the working position. Avoid sharp blows, scratches, or rough handling. Before initial power-up after low-temperature transportation, allow the unit to warm up at operating temperature for at least 3-4 hours.

Manufacturer's Warranty

The product complies with EU low voltage and electromagnetic compatibility directives. The manufacturer warrants normal operation for 24 months from the retail sale date, provided transportation, storage, installation, and operation regulations are observed. Warranty repair covers elimination of faults due to the manufacturer's fault. Warranty repair does not include routine maintenance, installation/dismantling, or unit setup.

To claim warranty service, provide the unit, user's manual with purchase date stamp, and proof of purchase. The unit model must match the manual. Contact the Seller for service.

Warranty does not apply if: the entire delivery package is not submitted; unit model/brand mismatches information; technical maintenance is neglected; external damage occurs; unit is redesigned; non-approved parts are used; unit is misused; installation or control regulations are violated; voltage differs from specified; power surges occur; unit is repaired by unauthorized persons; warranty period expires; transportation/storage regulations are violated; third parties cause damage; force majeure events occur (fire, flood, etc.); seals are missing; proof of purchase or manual is not provided.

Note: Following regulations ensures long and trouble-free operation. Warranty claims are reviewed only upon presentation of the unit, payment document, and user's manual with purchase date stamp.

Certificates and Information

Certificate of Acceptance: Records unit type, model, serial number, manufacture date, and quality inspector's stamp.

Seller Information: Fields for seller's details, purchase date, and customer signature, confirming acceptance of the unit and warranty terms.

Installation Certificate: Confirms the unit was installed according to the user's manual and applicable codes/standards, with fields for company name, address, technician's name, installation date, and signatures.

Warranty Card: Fields for unit type, model, serial number, manufacture date, purchase date, warranty period, and seller, along with seller's stamp.