Blauberg TwinBox EC User's Manual

Product Models

• TwinBox EC 150
• TwinBox EC 200
• TwinBox EC 250
• TwinBox EC 315
• TwinBox EC 355
• TwinBox EC 400

Contents

• 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

All operations must be performed by qualified personnel only. Disconnect power supply before any operations. Observe all applicable local and national construction, electrical, and technical norms and standards. Check the unit for visible damage before installation. Avoid casing compression, misuse, unauthorized modifications, exposure to adverse atmospheric agents, and ensure transported air is free of dust, sticky substances, or fibrous materials.

Do not use the unit in hazardous or explosive environments. Do not block vents. Do not sit on the unit or place objects on it. The company reserves the right to modify product characteristics. Never touch the unit with wet hands or barefoot. Before installing additional external devices, read their manuals. The unit is not intended for use by persons with reduced physical, sensory, or mental capabilities, or lack of experience, unless supervised. Children should be supervised to ensure they do not play with the unit.

Connection to the mains must be made through a disconnecting device. Ensure the unit is switched off from the supply mains before removing the guard. Take precautions to avoid back-flow of gases. Fixing means for attachment to the ceiling must withstand 4 times the weight of the appliance. Mounting of the suspension system shall be performed by the manufacturer, its service agent, or qualified persons. The appliance blades must be more than 2.3m above the floor.

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

Purpose

The unit is designed for supply and exhaust ventilation of domestic, public, and industrial premises requiring low noise levels and limited mounting space. It is a component part and rated for continuous operation. Transported air must not contain flammable or explosive mixtures, chemicals, sticky substances, fibrous materials, coarse dust, soot, oil particles, or environments favorable for hazardous substances.

Delivery Set

Designation Key

TwinBox EC 315

• Spigot connecting diameter [mm]
• Motor type: EC - electronically commutated
• TwinBox: A series of sound-insulated fans for round air ducts with two motors.

Technical Data

The unit is designed for indoor application with ambient temperatures from +1 °C to +40 °C and relative humidity up to 80% at 25 °C. Maximum permissible concentration of solids and dust in handled air is 10 mg/m³. The unit is rated as a Class I electrical appliance. Design is subject to continuous improvement.

Weight and overall and connecting dimensions of the fan unit [mm]

Technical specifications of the particular model are indicated on the unit casing.

Design and Operating Principle

The fan unit casing is made of galvanized steel with heat- and sound-insulation. It features a removable bottom cover for easy installation and maintenance. The round connecting spigots are rubber sealed. Inside, there are two mixed-type duct fans with energy-efficient motors featuring built-in controls and low-noise ball bearings for maintenance-free operation. One fan runs continuously, with the second acting as a backup. Fans can be switched alternately based on control automation algorithms, ensuring uninterrupted ventilation. If one fan fails, the second automatically switches on. Switching modes requires a controller (ordered separately). A swivel damper is installed inside the casing to prevent air backflow through a non-functioning fan. When a fan is running, the damper opens due to airflow and closes the duct of the inoperative fan.

Main design elements:

• 1 - swivel damper
• 2 - duct fan
• 3 - fan terminal boxes
• 4 - mounting brackets
• 5 - removable service panel
• 6 - inlet and outlet spigots
• 7 - cable glands on the unit casing
• 8 - safety cables to prevent the service panel from falling

Mounting and Set-up

Before mounting: Ensure the casing contains no foreign objects (e.g., foil, paper). While installing: Ensure convenient access for subsequent maintenance and repair.

Duct fans are designed for round air ducts and are installed in the gap between them. Installation is only possible in the horizontal position, following the direction of air flow indicated by an arrow on the casing.

Models TwinBox EC 150, 200, 250 are mounted at 4 points using brackets. Models TwinBox EC 315, 355, 400 have 6 mounting brackets.

It is recommended to use anchor threaded rods with nuts for fixing the fan unit to the ceiling. Fasteners are not included and should be ordered separately, considering the mounting surface material and fan weight. Fasteners should be selected by a service technician.

Safety cables on removable service panels can be moved to the opposite side of the casing for convenience, depending on the installation location.

Diagram showing mounting with threaded rod, washer, nuts, and vibration-absorbing insert.

Caution! To achieve optimal performance and minimize turbulence-induced air pressure losses, connect straight air duct sections to both spigots. Minimum straight air duct length: equal to 1 air duct diameter on intake and 3 air duct diameters on outlet.

If air ducts are short or not connected, protect unit parts from foreign objects. To prevent uncontrollable access to the fan, spigots may be covered with a protecting grille or device with mesh width not more than 12.5 mm.

Connection to Power Mains

WARNING: Disconnect the power supply before any operations. Connection is allowed by a qualified electrician with a work permit for electric units up to 1000 V after careful reading of this manual. Rated electrical parameters are on the manufacturer's label.

WARNING: Any tampering with internal connections is prohibited and will void the warranty.

The sound-insulated fan unit must be integrated into a ventilation system with automatic control. Connect to single-phase power mains as specified in the "Technical data" section. Use durable, insulated, and heat-resistant conductors. Wire cross-section selection must be based on maximum load current, conductor temperature, wire type, insulation, length, and installation method.

The external power input must have an automatic circuit breaker in the stationary wiring to open the circuit in case of overload or short-circuit. The circuit breaker's trip current must exceed the unit's maximum current consumption. The circuit breaker is not included and can be ordered separately.

Route power and control cables through cable glands on the casing. Route cables inside the casing to terminal boxes and secure with cable ties. Connect motor terminals according to the electrical mains wiring diagram using durable insulated cable. Terminal blocks for power and control cables are inside the terminal box on each motor casing.

Diagrams showing terminal boxes and wiring diagrams for TwinBox EC 150, 200, 250, 315, 355, 400 models.

Wiring for 1~220-240 V:

• X1: N (Blue), L (Brown)
• X2: +10V (Red), TACH (White), CTR (Yellow), GND (Blue)

Wiring for 1~220-240 V:

• X1: N (Blue), L (Brown), Yellow-green (Ground)
• X2: +10V (Red), TACH (White), CTR (Yellow), GND (Blue)

Technical Maintenance

WARNING: Disconnect the unit from power supply before any maintenance. Ensure the unit is disconnected from power mains before removing protection. Place a "DO NOT SWITCH ON! MEN AT WORK!" sign before commencing maintenance. Avoid liquid spills on the motor; do not use aggressive solvents or sharp objects for cleaning.

Clean product surfaces and impellers regularly (every 6 months) from dust and dirt. Use a soft brush, cloth, vacuum cleaner, or compressed air. Do not use water, aggressive solvents, or sharp objects, as they may damage the impeller. Do not remove or change the location of impeller balancers. Ensure no visible defects exist and that mounting brackets are securely fastened.

Troubleshooting

Storage and Transportation Regulations

Store the unit in the manufacturer's original packaging in a dry, closed, ventilated premise with temperatures from +5 °C to +40 °C and relative humidity up to 70%. Storage environment must not contain aggressive vapors or chemical mixtures that could cause corrosion or deformation. Use suitable hoist machinery for handling. Follow handling requirements for the cargo type. The unit can be transported in its original packaging by any mode of transport, provided it is protected against precipitation and mechanical damage. Transport only in the working position. Avoid sharp blows, scratches, or rough handling. Prior to initial power-up after transportation at low temperatures, allow the unit to warm up at operating temperature for at least 3-4 hours.

Manufacturer's Warranty

The product complies with EU norms and standards on low voltage and electromagnetic compatibility (EMC Directive 2014/30/EU, LVD Directive 2014/35/EU, CE-marking Council Directive 93/68/EEC). The manufacturer warrants normal operation for 24 months from the retail sale date, provided user observes transportation, storage, installation, and operation regulations. Malfunctions occurring due to the manufacturer's fault during the guaranteed period will be eliminated by warranty repair at the factory free of charge.

Warranty repair does not include:

• Routine technical maintenance
• Unit installation/dismantling
• Unit setup

To benefit from warranty repair, the user must provide the unit, user's manual with purchase date stamp, and payment paperwork. The unit model must match the manual. Contact the Seller for warranty service.

The manufacturer's warranty does not apply to the following cases:

• Failure to submit the unit with the entire delivery package, including missing component parts.
• Mismatch of unit model/brand with information on packaging and manual.
• Failure to ensure timely technical maintenance.
• External damage to the unit casing or internal components caused by the user.
• Redesign or engineering changes to the unit.
• Replacement or use of unapproved assemblies, parts, and components.
• Unit misuse.
• Violation of installation or control regulations.
• Connection to power mains with a voltage different from the one stated in the manual.
• Unit breakdown due to voltage surges.
• Discretionary repair by the user.
• Unit repair by unauthorized persons.
• Expiration of the warranty period.
• Violation of transportation or storage regulations.
• Wrongful actions against the unit by third parties.
• Breakdown due to force majeure (fire, flood, earthquake, war, etc.).
• Missing seals.
• Failure to submit the user's manual with the purchase date stamp.
• Missing payment paperwork certifying the unit purchase.

Following the regulations stipulated herein will ensure a long and trouble-free operation. Warranty claims are subject to review only upon presentation of the unit, payment document, and user's manual with the purchase date stamp.

Certificate of Acceptance

Unit Type: Noise insulated fan for round air ducts with two motors

Model:

Serial Number:

Manufacture Date:

Quality Inspector's Stamp:

Seller Information

Seller:

Address:

Phone Number:

E-mail:

Purchase Date:

This is to certify acceptance of the complete unit delivery with the user's manual. The warranty terms are acknowledged and accepted.

Customer's Signature:

Seller's Stamp

Installation Certificate

The unit is installed pursuant to the requirements stated in the present user's manual.

Company name:

Address:

Phone Number:

Installation Technician's Full Name:

Installation Date:

Signature:

The unit has been installed in accordance with all applicable local and national construction, electrical, and technical codes and standards. The unit operates normally as intended by the manufacturer.

Signature:

Installation Stamp

Warranty Card

Unit Type: Noise insulated fan for round air ducts with two motors

Model:

Serial Number:

Manufacture Date:

Purchase Date:

Warranty Period:

Seller:

Seller's Stamp