Demand Ventilation Control; Filter; Heat Exchanger; Temperature - Swegon CASA R2 SMART Installation, Commissioning And Maintenance Instruction

The unit's weekly timer can change operation modes
and temperature setpoint at the preset times. It is always
possible to override the weekly timer and change the
operation mode from a control panel or a Smart 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.

1.3 Demand ventilation control

Ventilation can be controlled by demand with following
Smart functions:
• Stepless Home/Away/Boost Control = ventilation
level is controlled according to the CO
• Humidity Control = ventilation is boosted steplessly
according to the moisture load caused by people.
• Air Quality Control = ventilation is boosted steplessly
according to VOC level.
• Smart Balancing Functions = supply and extract air
flow balance is controlled to maintain room pressure
level constant. i.e. cooker hood, fireplace or central
vacuum cleaner functions.
• Smart Cooling Boost = ventilation is boosted
according to cooling need.

1.4 Filter

The ventilation unit houses F7 fine filters for the extract
and supply air. Filter service is indicated periodically in
user panel or CASA Smart cooker hood.

1.5 Heat exchanger

The ventilation unit is equipped with a efficiency con-
trolled rotary heat exchanger. Heath exchanger is
controlled either to maintain constant supply air tem-
perature or to achieve maximum energy efficiency.

1.6 Temperature

The supply air temperature is regulated by changing the
temperature efficiency, with an integrated air heater or
with an air cooler, which is sold as an accessory.
In Eco mode the ventilation unit works with the best
possible temperature efficiency. It must be noted here
that the higher the extract air temperature, the greater
the direct effect will be on the supply air temperature.
The supply air temperature can be adjusted if necessary
by warmer supply air.
In Comfort mode the supply air temperature is kept
even with the help of partially passing heat recovery, i.e.
by controlling the temperature efficiency. It must be not-
ed here that the unit is not able to produce supply air
that is cooler than the outdoor air.
The control mode for the supply air is selected from the
temperature control settings. The default mode is Eco.
The temperature setpoint can be adjusted using the
control panel, weekly program, operating mode selec-
tion or based on room temperature.
Automatic summer night cooling recognizes the
need for cooling. The function lowers the supply air
temperature setting and bypasses the heat exchanger
for best cooling performance. The unit can't produce
cooler supply air than the outside air.
The unit can be equipped with an optional cooling coil,
which allows active cooling of the supply air.

1.7 External connections

All connections can be made without opening the
electrical box. Plug-in modules are available for external
connections. Wide variety of IO functions are available.
The ventilation unit is equipped with In-build Modbus.
Modbus cabling can be made easily with external cable
level. (SEC) or module (SEM). Unit can be fully controlled
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with Modbus and all external IO´s can be configured to
Modbus usage.

1.8 Protective functions

The heat exchanger freeze protection
The defrosting function guarantees continuous ven-
tilation and maintains units performance even during
extreme conditions.
The fan overheating protection
The fan overheat protection stops the fan if the tempera-
ture rises too high and is reseted automatically. If protec-
tion stops the fans an alarm is generated.
Rotor quard
Rotor quard detects that the rotor is working.
Malfunction generates an alarm.
Electric air heaters
The electric heater is equipped with automatic and
manual overtemperature protection. Overheat cuts the
heating circuit and generates an alarm.
Water-based air heaters
The ventilation unit with water-based air heater/cooler
has a temperature sensor that protects the coil from
freezing. Protection generates the alarm and starts
freezing prevention. If freezing prevention is not enough
the unit is stopped and demanded shut-off dampers are
closed. Freezing prevention is reseted automatically.
Cold supply air
The ventilation unit has built-in condensation protection.
If the supply air is too cold, the ventilation unit stops and
an alarm is generated
High temperature
If supply air or units internal temperature is detected
dangerously high the unit is stopped and an alarm is
generated.
Temperature sensors
If a sensor fault is detected, the ventilation unit runs in
restricted mode. The ventilation unit's returns to normal
mode once the fault has been corrected.
2020-11-27
R2 Smart
All rights to changes reserved.
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