Heat Recovery Ventilators
Once you connect your ventilation unit to Wi-Fi, you’ll be able to conveniently view key information in the app. If needed, our specialists will also be able to provide remote technical support. You’ll find detailed, step-by-step instructions on how to connect your device in the instructional video below.
If your Wi-Fi network offers both 2.4 GHz and 5 GHz options, be sure to select the 2.4 GHz network. OXYGEN devices do not support 5.0 GHz Wi-Fi networks, just like many other household appliances
Replacing the filters is quick and easy: no tools are required and it only takes a few minutes. Once you’ve replaced the filters, simply mark them as replaced in the app. You’ll find detailed, step-by-step instructions on how to do this in the instructional video below.
If your ventilation unit is operating loudly, it may have entered a protective mode because the filters have reached their maximum level of contamination. In this case, check the filters and replace them if necessary. After replacing the filters, be sure to mark them as replaced in the app.
Increased noise may also be caused by high humidity or CO₂ levels indoors. In such cases, the unit automatically increases its operating intensity to reduce humidity or CO₂ levels more quickly. As a result, it may operate more loudly than usual.
Yes, if your device has software version S001.44 or later, you can mark the filters as replaced using the control panel. Press and hold the two lower middle buttons, “Calendar” and “A”, simultaneously for approximately 5 seconds
If your ventilation unit is not working, check that the power socket is supplying electricity and that the circuit breaker in the electrical panel has not been switched off.
If there are no issues with the power supply but the unit is still not working, please contact our technical support service at help@oxygen.lt or +370 5 208 4887
The comfort temperature selected in the OXYGEN Easy app or on the LCD controller indicates your desired indoor temperature. Please note that the ventilation unit does not heat or cool the air like a heat pump. During the warmer months, the comfort temperature is used to control the bypass (available only in V-series units), which opens when the outdoor air is cooler than the indoor air. During the colder months, the selected comfort temperature is used to control an additional heater, which is purchased and installed separately.
The control panel may not work for the following reasons:
- The control panel may be incorrectly installed if it is mounted on an uneven surface. An electrical box opening is not suitable for mounting the remote control.
- The wires on the back of the control panel may not be connected correctly. We recommend checking the connections according to the unit’s installation manual.
- The cable connecting the control panel to the ventilation unit may be damaged. We recommend checking it‘s condition.
If the control panel still does not work after checking these possible causes, please contact our technical support service at help@oxygen.lt or +370 5 208 4887
You can purchase filters for your ventilation unit in our online store www.oxygen.lt/en by selecting the filters according to your unit model, or at our physical store at Lyderystės g. 2, Biruliškės, 54469 Kauno r. sav. We deliver the filters to parcel lockers or by courier.
The right filter combination depends on your living environment and personal needs:
- M5 + M5 set: Suitable for normal conditions. These filters capture dust and other impurities, helping protect the ventilation unit, ductwork and indoor spaces from contamination.
- M5 + M5 set: Suitable for normal conditions. These filters capture dust and other impurities, helping protect the ventilation unit, ductwork and indoor spaces from contamination.
- Carbon + M5 set: Recommended for homes located in areas with higher air pollution, such as near busy roads or in areas where solid fuel is used. The carbon filter helps capture airborne particles and reduce unpleasant odors entering the home.
If you would like to order a filter replacement service, please contact us at help@oxygen.lt and provide the following information:
- the ventilation unit’s serial number;
- property address;
- a contact phone number;
- photos of the ventilation unit to help us assess access for our technician.
If your ventilation unit is connected to Wi-Fi and the issue can be resolved remotely, assistance will be provided on the same business day. If a service technician’s visit is required to resolve the issue, the visit will be scheduled within three business days.
To help us assess the situation and respond as quickly as possible, please provide:
- the ventilation unit’s serial number;
- property address;
- a contact phone number;
- photos of the ventilation unit to help us assess access for our technician;
- a detailed description of the issue.
Please send all the information to help@oxygen.lt so that we can register your request and start resolving the issue as quickly as possible.
During the colder months, the ventilation unit’s energy consumption may increase because the preheater switches on to protect the heat exchanger from freezing. The heater is used to protect the unit and is not intended to heat the premises.
If the circuit breaker or residual-current device (RCD) trips, please contact our technical support service immediately at help@oxygen.lt or +370 5 208 4887
You can find the user manuals for our ventilation units by clicking the relevant link or scanning the QR code.
C-series (C150, C150E, C200, C200E, C250 & C250E):
https://www.oxygen.lt/en/oxygen-easy-c-serija
V-series (V200, V200E, V400, V400E, V500, V500E & V600):
https://www.oxygen.lt/en/visi-pdf/oxygen-easy-v-serija
In airtight A, A+, and A++ homes, a recirculating cooker hood should be installed. Its purpose is to collect moisture and grease. Unwanted odors generated during cooking will be removed by the heat recovery unit through the extract air vents provided in the kitchen area. “Carbon” filters may be used, but they are not necessary.
Almost any cooker hood becomes recirculating if it is not connected to an extract air duct. The most modern extraction solutions direct the cleaned airflow below or above the kitchen cabinets. From there, the heat recovery unit will collect it together with the remaining odors.
Ventilation system designers do not recommend, and professional installers never connect, a cooker hood branch to heat recovery ventilation ducts or to the unit itself. This is harmful because:
- When using a cooker hood with a fan, the ventilation system becomes unbalanced and may even freeze during cold winter weather. While such a hood is operating, some kitchen odors may also enter the living spaces through the ventilation system.
- When using a canopy-type hood, its capacity is not sufficient to collect steam effectively. When this type of hood is activated, air extraction from the remaining rooms is reduced.
- Proper installation of such a system requires expensive additional components, such as pressure relays and motorized dampers. A poorly installed system will not ensure effective ventilation of the premises.
- We recommend choosing a recirculating cooker hood and also installing a pressure relay sensor, then running any four-core cable from it to the heat recovery unit so that the “Boost” function can be activated. When using the cooker hood, it is necessary to switch on the heat recovery unit’s “Boost” function so that too much air is not extracted from the premises.
In airtight A, A+, and A++ homes, we recommend using only a recirculating cooker hood.
Air Conditioners
It is recommended to clean them at least once a month. This can be done independently, but seasonal maintenance should be carried out by professionals.
No. Most modern air conditioners also have a heating function, so they can be used all year round.
The condensate drain pipe may be clogged, or this may happen due to improper installation.
The amount of electricity consumed depends on the model, the size of the room, and the intensity of use, but modern units operate very efficiently.
Take into account the size of the room, the number of windows, and the level of insulation. It is best to consult a specialist.
Heat Pumps
It depends on your building type, whether you use underfloor heating or radiators, as well as your budget and the characteristics of your plot.
Yes, new-generation heat pumps operate even at temperatures as low as -25 °C, although their efficiency may decrease slightly.
10–20 years, depending on maintenance.
They do not generate heat — they transfer it, which is why they use much less energy (their COP can reach 3–5).
In most cases, no, but we always recommend checking the applicable building regulations or municipal requirements in individual cases.
General Questions
In newly built homes, residents often face excess construction-related moisture during the first year, which causes windows to fog up.
A heat recovery unit is a ventilation device whose function is to remove stale air, supply fresh air, and recover heat - not to collect or remove moisture. Therefore, if the humidity in your premises exceeds the recommended hygiene standards, we recommend using a professional dehumidifier until the humidity in the ventilated rooms drops to the recommended indoor relative humidity level, and also operating the heat recovery unit at a higher setting.
On a hot day, opening the windows will not cool your home down - it will only let in even more hot air. In winter, a heat recovery unit helps retain warmth, while in summer it helps retain coolness. That is why we also do not recommend switching off the heat recovery ventilation system completely during summer - let it run continuously at low power. When possible, the heat exchanger will cool the incoming fresh outdoor air by at least a few degrees. When the outdoor temperature drops, the ventilation unit automatically switches to “bypass” mode, so that cooler air is supplied directly, bypassing the heat exchanger. The unit will take care of your comfort both day and night by operating in different modes. On very hot days, however, only an air conditioner can ensure effective cooling.