FLEXIT UNI 4 Air Handling Unit User Guide
- June 3, 2024
- FLEXIT
Table of Contents
UNI 4 Air Handling Unit
User Guide
System description
The unit provides ventilation in the home.
It supplies fresh air to living rooms and bedrooms via valves, which are
normally located in the ceiling. At the same time used air is extracted from
the kitchen, bathroom, toilet and laundry room.
The unit contains a rotating heat exchanger that recovers around 80% of the
heat in the extract air and transfers it to the supply air when needed.
The unit is operated from a separate control panel.
Operation
Fan speed
The fan speed has to be adjusted to the need for ventilation. See
“consequences of incorrect operation”.
Min| Must not be used in the first year of operation or when the home is
in use
---|---
Normal| Normal operation
Max| Used for raised humidity levels, e.g.when the bathroom is in use,
and generally when there is an increased need for ventilation
If a lot of moisture is generated, it is important to use Max for a while
afterwards to give the system time to extract the moisture from the room.
CI60
The fan speed is adjusted using the + and – buttons on the panel. CI600
The fan speed is selected using the arrow keys and confirmed with OK.
Consequences of incorrect operation
Condensation
A lot of moisture is often generated in wet rooms as a result of drying
clothes, showering, etc. If the outdoor air is cold, it will cool the walls
down and the moisture in the indoor air could condense on the unit. If you
experience this, you must increase ventilation to Max when a lot of moisture
is being generated. Increased ventilation will ensure that the humid air is
extracted from the room and replaced with drier air.
Filters
Old and blocked filters provide poor ventilation and can also cause
condensation problems.
New homes
New homes give off large quantities of moisture and gases from textiles,
building materials, paint, etc. This is known as off-gassing and can cause
discolouration of walls and surfaces in the home. Ventilation is therefore
very important!
Maintenance
The unit must be unplugged from the mains before any maintenance is carried
out. Then wait a few minutes for the fans to stop.
Cleaning the fans
If the fans are to retain their capacity, it is important to ensure that they
are clean. This is particularly important for systems that are connected to a
kitchen hood. The fans therefore have to be removed for an annual inspection
and cleaned if any dirt and grease have built up on the fan blades. Clean the
fan blades with methylated spirits on a cloth or brush and, if possible,
compressed air.
NB! Make sure that the motor is not exposed to water.
Function check
When maintenance is being carried out, the system should be checked to make
sure that important parts are working properly:
Fans
Set the unit to Max and check that the supply air valves are blowing and the
extract air valves are sucking.
Rotor
It is vital that this should rotate when there is a need for heat recovery,
e.g. if the outdoor temperature is below 10°C. If the rotor is not working
properly, an error signal will appear on the control panel. Also check that
the air intake and exhaust are clear and not blocked by leaves and debris.
Changing the filters
Depending on how dusty the environment is, the filters will gradually become
blocked and let less air through. The filters therefore have to be changed at
least once a year (usually in the autumn).
Documentation
For more information see the user manual and installation instructions
supplied with the product.
They can also be downloaded from www.flexit.com.
Keep the projection documents, including the ventilation drawings, in a safe
place.
Flexit participates in the ECP programme for RAHU.
Check ongoing validaty of certificate: www.eurovent-
certification.com
The product is listed in the database for building products that can be used
in Nordic Swan
Ecolabelled buildings.
Flexit AS, Televeien 15,
N-1870 Ørje
www.flexit.no
111335EN-05
2022-02