EN
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100
Important
You must not change the settings
when cleaning the supply air dif-
fuser and extract air diffuser. The
air diffusers have be adjusted in
conjunction with commissioning
of the ventilation system.
A qualified technician sets the fan
speeds in accordance with na-
tional regulations in conjunction
with the commissioning of the
ventilation system. You should
not change the airflow yourself
as this may disruption system
functionality.
!
!
5. Protective safety
functions
The heat exchanger’s freeze protection
The heat exchanger is equipped with a reliable
freeze protection function that guarantees
continuous and balanced ventilation in the
home even during extreme conditions. If there
is a risk of the heat exchanger in the unit
freezing, the speed of the fans is changed and
the heated extract air prevents freezing inside
the heat exchanger.
Electric air heater
An automatic thermal overload cut-out
switches off the air heater if a fault situation
arises. This protective device automatically
resets itself when the air heater has cooled
down.
The overheating protection that requires
manual resetting can be reset by pressing a
button located inside the ventilation unit. The
location of the push buttons on the ventila-
tion unit are marked with a circle in the image
on the previous page. When you press the
reset buttons and feel a click, the overtem-
perature protection (thermal overload cut out)
has then been reset.
The “Re-heater fail” alarm appears on the
screen if the overtemperature protection
trips. The alarm disappears when the fault is
acknowledged.
The fans’ thermal overload protection
The fans have thermal overload cut outs,
which stop them if the temperature rises too
high. The controller also stops the fans if a
serious malfunction occurs in the ventila-
tion unit. The protective function resets itself
automatically when the temperature drops or
the malfunction has been remedied.
Temperature sensors
If a sensor fault is detected, the ventilation
unit enters restricted mode to prevent damage
to the ventilation unit. The functions related
to the current sensor in question are deacti-
vated and the ventilation unit works as well as
possible. The ventilation unit’s function returns
to normal once the fault has been corrected.
size can have very different pressure losses and
filter capacity. If an incorrect filter is used, it is
not certain that the ventilation unit will work as
designed. Check in the list of components that
you have selected correct filters.
4.4 Rotors and fans
The condition and cleanliness of the ventila-
tion unit’s fans and rotors must be checked at
least once a year.
In particular, if the extract air from the cooker
hood goes directly through the ventilation
unit, grease and dust can accumulate on the
extract air fan impeller and on the walls of the
ventilation unit’s fan chamber. If dirt builds up
in the fans this can affect the functionality of
the ventilation unit.
The fans, and on the R3 unit also the heat
exchanger, are located behind the protective
plates. Dismantling instructions for the protec-
tive plates can be found in the installation,
commissioning and maintenance instruc-
tion. If significant amounts of dirt collect on
the fan impeller cleaning should be left to a
professional.
Summary of Contents for CASA R5 Smart
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