VENTS Micra 60 User's Manual

Safety Requirements

Read the user's manual carefully prior to the operation and installation of the single-room heat recovery unit, hereinafter the unit.

Installation and operation of the unit shall be performed in accordance with the present user's manual and applicable local and national construction, electrical, and technical codes and standards.

The warnings in this manual contain vital personal safety information and must be considered most seriously. Failure to follow safety regulations may result in injury or unit damage.

Read the manual carefully and keep it as long as you use the unit. When transferring unit control, turn over the user's manual to the receiving operator.

Symbol legend used in the manual:

• ⚠️ WARNING!
• ? DO NOT!

Unit Mounting Safety Precautions

• The unit must be disconnected from the power supply prior to every installation or repair operation.
• The unit must be grounded! ⏚
• The unit must not be operated outside the stated temperature range or in aggressive or explosive environments.
• Do not use damaged equipment or conductors to connect the unit to power mains.
• While installing, follow safety regulations specific to electric tools.
• Unpack the unit with care.
• Do not change the power cord length at your own discretion. Do not bend or damage the power cord.
• Do not position any heating devices or other equipment near the unit power cord.

Unit Operating Safety Precautions

• Do not touch the controller or remote control with wet hands. Do not perform maintenance with wet hands.
• Do not wash the unit with water. Protect electric parts from water ingress.
• Use the unit only as intended by the manufacturer. Do not connect clothes dryers or similar equipment to the unit or ventilation system.
• Do not place containers with water (e.g., vases) on the unit.
• Do not sit on the unit or place objects on it.
• Disconnect the unit from power supply prior to maintenance. [Power Off Symbol]
• Do not let children operate the unit.
• Do not damage the power cable while operating the unit. Do not place objects on the power cable.
• Keep explosive and inflammable products away from the unit.
• Do not open the operating unit.
• In case of unusual sounds or smoke, disconnect the unit from power supply and contact the service centre.
• For long-lasting operation, periodically check mounting reliability.
• Do not block the air duct when the unit is on.
• Do not direct air flow from the unit to open flame devices or candles.

Introduction

Use

This user's manual provides technical description, operation, installation, and mounting guidelines, and technical data for the VENTS Micra 60 single-room heat recovery air handling unit.

The Micra 60 is an energy-saving appliance based on heat recovery technology, used as a component part of a ventilation system, not for stand-alone operation. It arranges permanent controllable air exchange in flats, cottages, hotels, cafes, and other premises, warming filtered air with recovered extract air heat energy. The unit is designed for wall surface mounting and continuous operation.

Transported air must not contain flammable or explosive mixtures, chemical evaporation, coarse dust, soot, oil particles, sticky substances, fibrous materials, pathogens, or other harmful substances.

THE UNIT IS NOT INTENDED FOR USE BY CHILDREN, PHYSICALLY OR MENTALLY DISABLED PERSONS, PERSONS WITH SENSORY DISORDER, OR PERSONS WITHOUT APPROPRIATE QUALIFICATION.

INSTALLATION AND CONNECTION OPERATIONS MUST BE PERFORMED ONLY BY PROPERLY QUALIFIED PERSONNEL AFTER APPROPRIATE SAFETY BRIEFING.

THE UNIT INSTALLATION PLACE MUST PREVENT ACCESS BY UNATTENDED CHILDREN.

Delivery Set

• Micra 60 unit - 1 item
• Fastening set - 1 item
• User's manual - 1 item
• Master plate - 1 item
• Packing box - 1 item
• Sensor or mechanical speed switch - 1 item

Designation Key

For Micra 60-AX:

• Unit name: Micra 60-AX
• Air capacity: [m³/h]
• Speed switch system: 3 - mechanical speed switch P3-1-300, 4 - sensor speed switch SP3-1

Main Technical Parameters

The unit is designed for indoor application with ambient temperature from +1°C (+34°F) up to +40°C (+104°F) and relative humidity up to 80%. Transported air temperature must be from -20°C (-4°F) up to +50°C (+122°F).

The unit is classified as a class I electric appliance.

Ingress Protection (IP) rating:

• IP 44 for the unit motors.
• IP 22 for the assembled unit integrated into air ductworks.

The unit design is regularly improved; some models may slightly differ from those described in this manual.

Unit Overall Dimensions

Diagram showing overall dimensions in millimeters. Key dimensions include: Height 526mm, Width 393mm, Depth 159mm, Duct Diameter Ø124mm.

Unit Technical Data

Design and Operating Logic

• The unit casing is made of painted steel, internally filled with a layer of heat- and sound-insulating material.
• The unit casing incorporates a plate heat exchanger, a supply fan, and an extract fan.
• The front panel is installed on rotating sleeves for quick servicing access.
• The casing bottom is equipped with a protecting service panel for access to the automation unit.
• The G4 supply filter is installed between the fan and the heat exchanger to provide filtered supply air to the room. The G4 extract filter is installed in the upper part of the front panel.

Freezing Protection: A temperature sensor downstream of the heat exchanger in the exhaust air duct provides freezing protection. If the exhaust air temperature drops below +3°C (+37.4°F), the supply fan turns off, and the unit operates in extract mode only. The unit reverts to standard operation once the heat exchanger warms up and the freezing danger is no longer imminent.

Unit Operation Logic: Warm stale extract air from the room flows through air ducts to the unit, is purified by the extract filter, moves to the heat exchanger, and is exhausted by the extract fan. Clean cold outside air is supplied by supply fans, purified by the supply filter, passes through the heat exchanger, and is supplied to the room. Heat energy from the warm extract air transfers to the fresh intake air within the heat exchanger, minimizing heat energy losses and operating costs.

Diagram illustrating air flow: [Extract air arrow] (warm, stale) enters, passes through extract filter and heat exchanger, then is exhausted. [Supply air arrow] (clean, cold) enters, passes through supply filter and heat exchanger, then is supplied to the room. [Intake air arrow] and [Exhaust air arrow] are also depicted.

Mounting and Set-up

Unit mounting is performed using the master plate from the delivery set and two air ducts of required length, or optional mounting kits: MK1 Micra 60 or MK2 Micra 60 (special accessories).

The MK1 Micra 60 mounting set is designed for mounting at general construction stage and includes two plastic air ducts (500mm / 19 11/16" long) and two master plates for marking holes on inner and outer wall sides.

The MK2 Micra 60 mounting set is designed for mounting in a ready-built premise and includes two plastic air ducts (500mm / 19 11/16" long), a master plate, and an outer ventilation hood NB Micra 60 to prevent foreign object ingress. For wall thickness above 500mm, prepare two extra Ø125mm (Ø5") air ducts of required length.

Paper Master Plate for Hole Marking [MM] (INCHES)

Diagram shows dimensions for marking holes. It indicates drilling two Ø8mm (5/16") holes for dowels (60mm / 2 3/8" deep) and two Ø125mm (5") holes for air ducts. The air duct holes should be sloped down by 2-3° and gaps filled with mounting foam.

Unit Mounting

The unit is mounted as follows:

1. Fix the master plate from the delivery set on the wall with sealing tape at the required level.
2. Use a master plate to mark two Ø130mm (5 1/8") holes for the air ducts and two Ø8mm (5/16") holes for the dowels.
3. Remove the master plate and drill through holes for the air ducts and 60mm (2 3/8") deep holes for the dowels. Drill the air duct holes sloped down by 2-3°. Insert dowels into respective holes.
4. Re-install the master plate with sealing tape. Fix the master plate from the mounting kit (MK1 or MK2) on the outer wall side to align air ducts. Fix it slightly lower to ensure the minimum required slope of 3°. Before mounting, press perforated holes to remove fragments and prepare holes for air ducts.
5. Insert air ducts into master plate holes and seal with mounting foam through the master plate holes. Ensure ducts are sloped down by 2-3° for condensate drainage.
6. After mounting foam hardens, remove the master plate. Cut protruding air duct parts flush with the inner wall. On the outer wall, air ducts should protrude 10mm (3/8") to prevent condensate dripping on the wall.
7. Unit installation sequence: Open the front panel and remove the heat exchanger. Connect the unit spigots to the plastic air ducts. Fix the unit to the wall with screws (5.0x50) into Ø8mm (5/16") holes. Install the heat exchanger and close the front panel. Install the NB Micra 60 outer ventilation hood on the outer wall to prevent foreign objects entering the air ducts.

Attention! Round plastic air ducts and the outer ventilation hood are not included in the delivery set and are available separately. Other ventilation grilles and hoods of matching size may be used.

Unit Mounting with MK1 Micra 60 Mounting Set

The MK1 Micra 60 mounting set is designed for installation at general construction stage. It includes two plastic air ducts (Ø125mm, 500mm long) and two paper master plates. Mounting sequence involves fixing the first master plate, marking holes, drilling, re-installing the first plate, fixing the second master plate on the outer wall to align ducts with a 3° slope, installing air ducts, sealing, and cutting protruding parts.

Unit Mounting with MK2 Micra 60 Mounting Set

The MK2 Micra 60 mounting set includes two plastic air ducts (Ø125mm, 500mm long), one paper master plate, one NB Micra 60 outer ventilation hood, and four 8x40 screws and dowels. Mounting sequence is similar to MK1, with the addition of installing the NB Micra 60 outer hood using the provided screws and dowels.

Speed Switch Mounting

MAKE SURE THAT THE SPEED SWITCH IS NOT DAMAGED. DO NOT OPERATE A DAMAGED SPEED SWITCH! DO NOT INSTALL THE SPEED SWITCH ON AN UNEVEN SURFACE! DO NOT APPLY EXCESSIVE FORCES WHILE TIGHTENING THE SCREWS TO AVOID SPEED SWITCH CASING DEFORMATION.

General steps: Route all required cables and wires to the installation place. Insert the junction box from the delivery set inside the wall.

P3-1-300 Mechanical Speed Switch Mounting

Connect the executive element according to the wiring diagram, insert it into the junction box, and fasten with two screws. Cover the executive element with a decorative panel and press the latches to fix the panel.

SP3-1 Sensor Speed Switch Mounting

Undo the switch front panel latches gently. Remove the back panel. Fix the back panel to the wall through the fastening openings. Connect the control cable to the sensor speed switch according to the wiring diagram. Install the front panel of the speed switch on the latches.

Connection to Power Mains

DISCONNECT THE UNIT FROM POWER MAINS PRIOR TO ANY ELECTRIC INSTALLATION OPERATIONS. CONNECT THE UNIT TO A CORRECTLY INSTALLED SOCKET WITH A GROUNDED TERMINAL. ANY INTERNAL CONNECTION MODIFICATIONS ARE NOT ALLOWED AND RESULT IN WARRANTY LOSS.

The unit is rated for connection to single-phase ac 1~100-240 V / 50-60 Hz power mains.

The control unit is installed under the unit protecting panel. The unit is connected to the control unit via a 3m long four-wire cable from the delivery set. Each wire cross-section must be min. 0.25 mm². The maximum cable length from the unit to the control unit is 30m.

Wiring Diagram for the Unit with P3-1-300 Mechanical Speed Switch

Diagram shows connections for the P3-1-300 mechanical speed switch to the controller and mains power. Key connections include GND, +12V, N, L, PE, M1 (extract), M2 (supply), and speed control lines (L1, L2, L3).

Wiring Diagram for the Unit with SP3-1 Sensor Speed Switch

Diagram shows connections for the SP3-1 sensor speed switch to the controller and mains power. Key connections include L1, L2, L3 for speed control (Low, Middle, High), and input/output terminals for the controller.

Unit Control

P3-1-300 Mechanical Speed Switch

To activate a required unit speed, rotate the speed knob clockwise and select one of three settings: 1 - low speed, 2 - middle speed, 3 - high speed. To turn the unit off, rotate the speed knob counter-clockwise to the OFF position.

Diagram shows the speed knob with OFF, 1, 2, 3 positions.

SP3-1 Sensor Speed Switch

To activate a required unit speed, touch a respective speed button on the sensor panel: 1 - low speed, 2 - middle speed, 3 - high speed. For speed changeover, touch the respective speed button; the active button glows blue. To turn the unit off, touch the current speed button again. The sensor switch panel is not lighted when the unit is off. The speed switch generates a sound signal each time the sensor panel is touched.

Diagram shows the sensor panel with touch buttons.

Maintenance

DISCONNECT THE UNIT FROM POWER SUPPLY BEFORE ANY MAINTENANCE OPERATION WITH THE UNIT.

Recommended maintenance periodicity is 3-4 times per year. Maintenance involves regular cleaning of surfaces and cleaning or replacement of filters.

To remove dust, use a soft brush, cloth, or vacuum cleaner. Do not use water, abrasive detergents, solvents, or sharp objects. Impeller blades must be cleaned once a year.

Clogged filters increase air resistance and impair air capacity. Clean filters with a vacuum cleaner or flush under running water. Filters must be cleaned at least 3-4 times per year.

Clean the heat exchanger regularly to maintain high heat recovery efficiency. Remove the heat exchanger prior to cleaning. Clean it with a vacuum cleaner or flush under running water.

Diagram shows unit components: Casing, Supply filter, Heat exchanger, Extract filter, Front panel.

Fault Handling

Faults and Fault Handling

Storage and Transportation Rules

Store the unit in the manufacturer's original packing box in a dry, ventilated premise at temperatures from +5°C (5°F) up to +40°C (104°F).

Storage environment must not contain aggressive vapours or chemical mixtures that could cause corrosion, insulation, or sealing deformation.

Use hoist machinery for handling and storage to prevent damage from falling or excessive oscillation. Follow handling requirements for the applicable freight type.

Transportation by any vehicle type is allowed if the unit is protected against mechanical and weather damage. Avoid mechanical shocks and strokes during handling.

Manufacturer's Warranty

The manufacturer warrants normal operation for 24 months from the retail sale date, provided user observes transportation, storage, installation, and operation regulations.

Malfunctions during the warranty period due to manufacturer's fault are subject to warranty repair. Warranty repair includes work to eliminate faults and ensure intended use, by means of replacement or repair of the unit or faulty part.

Warranty repair does not include: Routine maintenance; unit installation/dismantling; unit setup.

To benefit from warranty repair, provide the unit, user's manual with stamped sale date, and payment document.

The unit model must comply with the one stated in the user's manual. Contact your Seller for warranty service.

The manufacturer's warranty does not apply in cases of:

• Failure to provide the entire delivery package or missing component parts.
• Mismatch of unit model/make with packing and manual details.
• Failure to ensure timely technical maintenance.
• External damage to casing (excluding installation modifications) and internal components.
• Alteration of unit design or engineering changes.
• Use of non-approved assemblies, parts, or components.
• Unit misuse.
• Violation of unit installation or control regulations.
• Connection to power mains with a voltage different from stated.
• Unit breakdown due to voltage surges.
• User's discretionary repair.
• Unit repair by unauthorized persons.
• Expiry of warranty period.
• Violation of transportation or storage regulations.
• Wrongful acts by third persons.
• Breakdown due to force majeure (fire, flood, earthquake, war, blockade, etc.).
• Missing seals (if provided).
• Failure to provide the user's manual with a sale date stamp.
• Missing payment document.

FOLLOWING THE REGULATIONS STIPULATED HEREIN WILL ENSURE A LONG AND TROUBLE-FREE OPERATION OF THE UNIT.

USERS' CLAIMS SHALL BE SUBJECT TO REVIEW ONLY UPON PRESENTATION OF THE UNIT, THE PAYMENT DOCUMENT AND THE USER'S MANUAL WITH THE SALE DATE STAMP.

Acceptance Certificate

Product Type: The single-room heat recovery air handling unit

Model: Micra 60-A

Serial Number:

Manufacturing Date:

The unit is recognized as serviceable. Declaration of compliance with Electromagnetic Council Directive 2004/108/EC, 89/336/EEC, Low Voltage Directive 2006/95/EC, 73/23/EEC, and CE-marking Directive 93/68/EEC.

Quality Inspector's Stamp:

Seller's Information

Shop name:

Address:

Telephone:

E-mail:

Sales date:

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

Customer's signature: [Seller's seal]

Mounting Certificate

The heat recovery air handling unit Micra 60 has been connected to power mains pursuant to the requirements stated in the present user's manual.

Company name:

Address:

Telephone:

Installation technician's full name:

Installation date:

Signature: [Installation technician's company seal]

This is to certify that the works specific to the unit installation have been performed in accordance with all applicable provisions of local and national construction, electrical, and technical codes and standards. The unit operates normally as intended by the manufacturer.

Signature:

Warranty Card

Product type: The single-room heat recovery air handling unit

Model: Micra 60-A

Serial number:

Manufacturing date:

Sales date:

Warranty period:

Sales company: [Seller's seal]

Additional space for notes or warranty details.