14
W100B.021014
Swegon reserves the right to alter specifications.
www.swegon.com/casa
Important
The ventilation unit must not be operated
without filters! Use only filters recom-
mended by Swegon in the ventilation unit.
Find the correct filter in the Section enti-
tled: ”Technical data”.
Important
Anti-freeze protection
During periods of cold weather, the heat
exchanger is liable to freeze if the extract
air is humid. A protective function then au-
tomatically reduces the speed of the supply
air fan. Under such conditions, variations in
the fan speed are therefore normal.
The LED on a Premium control panel flashes
green when the anti-freeze protection is
activated.
5. Alarms and troubleshooting
5.1 Alarms from a Premium control panel
The alarms displayed on a Premium control panel are
described in the instructions for use.
5.2 Troubleshooting:
Possible malfunctions are indicated by alarm texts on
the Premium control panel. Inspect the components
related to the malfunction and remedy the malfunction.
5.2.1 The supply air is not sufficiently heated
Low temperature setting for supply air
Investigate and, if necessary, increase the temperature
from the Premium control panel or on the Econo model
with the thermostat inside the ventilation unit. At the
same time check that bypass for summertime operation
is not open.
Malfunction of the electric air heater (on the elec-
tric models only)
The air heater has overtemperature protection and one
overheating protection function. The alarm is initiated if
either of these is activated.
The overtemperature protection resets itself automati-
cally when the temperature decreases. The overheating
protection must be reset by pressing a push button on
the air heater. If you hear a click when you press in the
button, this indicates that the overheating protection
has been reset.
Excessively high temperature may be due to too low an
air flow through the air heater. The cause can be that
a filter, outer wall grille or supply air device is clogged.
Replace and clean, if needed.
Tip:
An insect net can be fitted inside the outer wall
grille. If the net has small mesh, dust and insects can
clog it. During certain conditions it is also liable to
freeze. Remove the net or replace it with a net with
larger mesh.
An excessively high temperature can also be due to the
supply air fan having stopped or that the temperature
sensor has been shaken loose from its position in the
suction opening of the fan.
If the bypass cover for summertime operation is not
completely closed, the air heater for reheating will not
switch on.
5.2.2 Badly isolated ventilation ducts
If the unit emits warm air but the supply air discharged
from the air diffuser feels cold, this may be due to
poorly insulated ventilation duct.
5.2.3 The ventilation unit does not obey commands
If two overlapping commands are issued, the unit obeys
the command with the highest priority, e.g. the anti-
freeze protection.
Priority 1: Commands from outer sensor or the
Reset button for the over-
temperature protection on
the preheating air heater
Reset button for the over-
temperature protection on
the preheating air heater
(Only models with electric
air heater)
ventilation unit’s protective functions.
Priority 2: External supervision (DDC).
Priority 3: Normal operation from the control panel or
the cooker hood.
The control priorities are described in more detail in the
Section entitled: ”Control functions with accessories”.
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