General Description; Enclosure; Fans; Filter - Swegon CASA W4 Smart Installation, Commissioning And Maintenance Instruction

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 conforms to enclosure class IP34
when the cover is closed.

1.2 Fans

The Swegon CASA W4 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 = large air flow is used when the ventilation
requirement increases, e.g. for cooking, taking a
sauna, showering or drying laundry.
• Home = normal air flow. Guarantees that there is
sufficient fresh indoor air in the home, and that the
building construction is at its best.
• Away = low air flow. 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 post heating, 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 air flow boost time of 30, 60 or
120 minutes or continuous boost from a Smart control
panel. When the unit is controlled from a cooker hood,
the fan's air flow boost time is 60 minutes. You can
select a damper open time of 30, 60 or 120 minutes.

1.3 Filter

The ventilation unit houses a G3 filter for the extract
air and a F7 fine filter and a heat resistant filter for the
supply air.
We reserve the right to alter specifications.

1.4 Heat exchanger

The plate heat exchanger in W4, which is based on
the counterflow technology, is made of aluminium
fins and its efficiency is high, above 80 %. The incom-
ing and outgoing air flows in a counterflow plate heat
exchanger use separate channels, and thanks to this the
heat exchanger does not return any odours or moisture
back into the room air. The heat exchanger can be easily
removed from the unit for inspection and servicing.

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.
In the Econo models, the setpoint can be set with
a thermostat inside the ventilation unit. You can
turn the thermostat dial to the minimum setting if
heating is not required.
W4's intelligent summer mode helps to maintain
the home's indoor air comfort even during hot sum-
mer days. Very economical comfort coolness can be
produced almost free of charge by utilising the heat
exchanger and the difference between indoor and
outdoor temperatures 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 outdoor air. This is managed by an advanced auto-
matic system.
www.swegonhomesolutions.com
W4.080219
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