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2. Safety instructions
Always follow the safety instructions that are included in the User Manual. Failure to observe them may result in personal
injury or damage of the heat recovery system.
(1) The equipment has been developed and produced to provide controlled ventilation in residential buildings and premises.
(2) The equipment may only be used for purposes for which it has been developed and produced and for which it has
adequate technical capabilities – in line with the conditions defined by the manufacturer, its design, construction and
technical condition complying with safety regulations.
(3) The heat recovery equipment must be installed in compliance with general and locally valid safety regulations.
(4) The heat recovery equipment may only be installed, connected, commissioned and maintained by an authorized service
technician with respective professional qualifications. A service technician is a person with adequate qualifications,
experience and knowledge of respective regulations, standards as well as possible risks and dangers.
(5) The equipment may only be independently operated by physically and mentally apt persons that have thoroughly read
and understood the User Manual. The User Manual must be stored in an accessible place.
(6) Do not change or modify the heat recovery system in any way!
(7) Follow the time intervals for regular filter replacement.
(8) Do not repair the heat recovery equipment! If you find a defect or damage, make sure you switch off the unit and con-
tact a service technician immediately.
(9) We do not recommend you to leave the heat recovery system off for prolonged periods even in the periods of absence
of persons. Always let the system run at the lowest ventilation level or in the Automatic Mode.
Any maintenance activities, incl. filter replacement may only be carried out on the heat recovery equipment
if the unit has been disconnected from the electric mains!
During the replacement of filters do not reach into the filter space with your hand! Avoid the risk of hand injury!
The equipment must not be operated together with an open fireplace or with any fireplace without
its own air supply!
3. Heat recovery operation principle
The heat recovery system ensures continuous replacement of used air with fresh, clean air. Heat recovery takes place in
the exchanger, where the supplied air receives a part of heat and humidity from the exhausted air (mainly from the kitchen,
bathroom, WC etc.). So the fresh air, which continuously flows into the interior (living room, children’s bedroom, study etc.)
is thermally optimized and also filtered. The air that is exhausted from the interior is also filtered. The individual streams
are mutually separated so they will not get mixed.
An automatic by-pass is integrated in the heat recovery unit that enables after-cooling of the residential premises in the
summer months, in the night mode. In this season, heat transfer is not desirable so the by-pass channel leads air outside
the exchanger and prevents the colder night air from being heated up by the warm exhausted air.
The functional principle of heat recovery is illustrated in fig. 2.
AMBIENT
AIR
WASTE
AIR
FRESH
AIR
INDOOR
AIR
BYPASS
Fig. 2 – Illustrative diagram of the operation of the ventilation with heat recovery system