1. General Description
The most important function of the ventilation system
is to ensure clean and fresh indoor air and to remove
moisture. The air in the home should be changed at
a continuous and sufficient rate to ensure a pleasant
indoor climate and avoid damage to building elements
caused by dampness. The ventilation unit should be
stopped only while service work is in progress.
1.1 Enclosure
The ventilation unit’s enclosure class is IP 34 when the
inspection door is closed.
1.2 Fans
The Swegon CASA R3 is equipped with energy-efficient
fans with EC motors, advantageous in that their speed
is variably controllable and their efficiency is high even
when they operate in the lower speed range. The power
supply and control cables of the fans have quick-fit con-
nectors making the fans easily removable from the unit,
if required.
The fans can be controlled in four operating modes
from a Smart control panel or in three operating modes
from a compatible Swegon CASA cooker hood:
• Boost = A large airflow is used when the ventila-
tion requirement increases, e.g. for cooking, taking a
sauna, showering or drying laundry.
• Home = Normal airflow. Guarantees that there is
sufficient fresh indoor air in the home, and that the
building construction is at its best.
• Away = Low airflow. Reduces power consumption
when the ventilation requirement in the home is
small.
• Travelling = Very low air flow and lower supply air
temperature. Used when no one is present in the
home. (Can only be selected from a Smart control
panel.)
The unit’s weekly timer has four programs that can
switch in the various fan modes at the preset times.
On the unit with electric reheating, you can also select
the required temperature of the supply air. Even when
the ventilation unit is being controlled with the weekly
timer, it is always possible to change the fan mode from
a control panel or a cooker hood.
You can select an airflow boost time of 30, 60 or 120
minutes or continuous boost from a Smart control pan-
el. When the unit is controlled from a cooker hood, the
fan’s airflow boost time is 60 minutes. You can select a
damper open time of 30, 60 or 120 minutes.
1.3 Filter
The ventilation unit has class F7 fine filters for the sup-
ply air and the extract air.
1.4 Heat exchanger
The ventilation unit is equipped with a rotary heat
exchanger that consists of a rotor whose aluminium
fins form a large number of ducts through which the
air flow passes. During the heating season, heat that is
stored in the ducts on the extract air side is emitted to
the cold air on the supply air side. The heat exchanger is
motor driven.
1.5 Temperature
The user sets the required value for minimum supply
air temperature, and the ventilation unit then strives to
reach this temperature if possible. Swegon recommends
that the supply air temperature is set between 15–20 °C
and the factory setting is 17 °C, which is sufficient for
draught-free ventilation. The supply air temperature
should be 3–4 °C lower than the room temperature, so
that the supply air mixes fully with the room air.
Remember the following when setting the supply air
temperature:
• A high temperature setting will also increase the
ventilation unit’s power consumption.
• A low temperature setting, for example, 14 °C, can
cause condensation to collect in the system.
• The ventilation unit cannot cool the supply air with-
out an air cooler (duct coil), which is available as an
accessory.
R3’s intelligent summer function helps to maintain the
home’s indoor air comfort even during hot summer
days. Very economical comfort coolness can be pro-
duced almost free of charge by utilising the difference
between indoor and outdoor temperatures and the
heat exchanger intelligently. The heat exchanger takes
care of the cool indoor air during hot summer days and
cools the incoming outdoor air. At night the air passes
the heat exchanger and the home is cooled with fresh
outdoor air. This is managed by an advanced automatic
system.
1.6 Protective functions
The heat exchanger’s anti-freeze protection
R3’s reliable defrosting function guarantees continuous
and balanced ventilation in the home even during ex-
treme 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.
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
ventilation unit. The protective function resets itself au-
tomatically when the temperature drops or the malfunc-
tion has been remedied.
Electric air heater
An automatic thermal overload cut-out switches off the
air heater if a fault arises. This protective device auto-
matically resets itself when the air heater has cooled
down.
