enervent Svea eAir - Page 25

25Installation instructions for professionals
Weekly and annual programs
Time programs can be used to activate a user mode at a
certain time on certain weekdays, or for some calendar
days.
For example, when the apartment is empty, the fan speed
can be reduced by creating a time program that sets the
unit in Away mode.
Weekly and annual programs are set in the Time programs
menu. The weekly program has 20 dierent time program
entrys, to which you can enter both the start and the
end times of the time program and the mode according
to which the unit functions for that time. If the weekly
program is wanted to run overnight, both the starting and
ending weekdays must be selected in the program.
The annual program has ve time program entrys, to
which you can enter both the start and the end dates of
the time program with hour and date information and the
mode according to which the machine functions for that
time.
Time program does not check for possible conicts
in programs. The user must ensure that there are no
conicting programs.
Temperature control
Heat recovery
Heat recovery is limited during summertime if the
outdoor temperature is over +8°C. During this time the
rotating heat exchanger is not operating if there is no
need for heating.
Maximum heat recovery is on when outdoor temperature
is lower than +8°C. This may lead to contradictions,
especially in the spring, when the sun is heating the
indoor air even though the temperature outside is still
under +8°C. The temperature limit value can be changed
from the control panel.
Cooling recovery
During the summertime power limitation, the heat
exchanger activates at full power when the outdoor air
is over 1°C warmer than extract air. The heat exchanger
stops, when the outdoor temperature drops below the
extract air temperature. This helps in keeping inside air
cool in the summer.
Heat recovery defrost
eAir control periodizes the rotation of the rotating heat
exchanger when there is a risc for freezing. Normal
rotation of the rotating heat exchanger is resumed when
defrosting is nished. Defrosting can be activated from
the control panel.
Eciency of heat recovery
The eciency of the heat recovery of supply and extract
air is displayed in the Measurements menu of the control
panel.
Supply, extract, and room
temperature controls
The supply air temperature in the ventilation unit is
controlled by the supply air controller. The ventilation unit
can be used either as supply air controlled, which is when
the controller keeps the supply air temperature at the
set-point, or as extract or room temperature controlled,
which is when the controller keeps the extract or room
temperature at the set point by controlling the set point
of the supply air controller.
The supply air controller makes sure that the supply
air temperature stays at the set-point. If the outdoor
temperature is less than the heat recovery temperature
limit (default value +8°C), or if the ECO mode is active, the
supply air temperature can rise over the set temperature.
This temperature rise is from forced heat recovery only.
Extract or room temperature constant control is used
when the apartment needs to be heated or cooled by the
ventilation unit. Constant extract air temperature control
is factory setting in ventilation unit models that have
cooling.
If the outdoor temperature is less than the heat recovery
temperature limit (default value +8°C), or if the ECO mode
is active, the extract or indoor air temperature can rise
over the set temperature. This temperature rise is from
forced heat recovery only.