Icing Protection; Operation Together With Fireplaces; Operation Modes; Tab. 3 Operation Modes - jablotron Futura User Manual

4.8. Icing protection

The heat recovery system is technically as well as structurally ready for operation at temperatures below the freezing
point without the need of preheating, down to the temperature of -19 °C. During operation, when the outdoor temperatu-
res remain below the freezing point, the drying cycle is activated as necessary – based on the operation logic evaluation.
The interval between drying cycles is not fixed; it is activated approx. 1× every 3 days. In the period of extreme frosts, this
interval may get reduced.
Thanks to this function, no other frost protection in the form of electric preheating is necessary (see page 7, 5. Operation
modes).

4.9. Operation together with fireplaces

The heat recovery system is designed for operation together with a fireplace that is intended for passive buildings, has
a sealed fireplace insert and its own air supply.
The system must not be operated together with an open fireplace or with any fireplace without its own air
supply!
Use together with fireplaces is only possible if the relevant safety and fire regulations and standards are observed. This
operation requires setting and using the Overpressure function (see page 8, 6. Functions of the heat recovery system).

5. Operation modes

The user can set several modes of the heat recovery unit that influence its current output. In the default state, the unit
works in the Automatic Mode. The current mode of the unit can be changed in the Time Schedule or manually (control) The
operation modes of the heat recovery unit are shown in Tab 3.
The unit is off, does not evaluate the connected peripherals, no temperature, humidity or CO
measurements are carried out. It communicates with the Jablotron cloud in longer time intervals
(of several hours). The unit responds to the On command. The consumption in this mode is below
the threshold of 1 W. If the air temperature at the outlet of the heat recovery system decreases
Off
below 0 °C, the Drying mode will be started and the unit can only be switched off after that.
If the unit is switched on during Drying, this mode must be completed first and the unit can only
be switched on after that.
The heat recovery system is in the standby mode, but the air exchange is not active. Information
from all the connected sensors is available, being continuously evaluated. Thanks to the connection
Stand-by
to the Jablotron Cloud, the heat recovery unit can be activated and its settings can be changed any
time. In the Stand-by mode the unit responds to the Boost function.
This is a mode where the user selects the fan power level in the range of values 1 – 5. Depending
Constant Power
on the temperature and humidity setpoint, the system controls the by-pass flap and connected
peripherals. It controls turning of the heat exchanger flaps and the drying flap based on the
actual temperature and humidity.
Default mode of the heat recovery unit. This is a mode that uses information from the connected
Automatic Mode CO
is adapted to the requirements for quality of the indoor environment. The unit remains in this
mode until it is switched to the Time Schedule mode.
A mode where the user adjusts the fan power level in the range of values 1 (minimum)
Time Schedule
– 5 (maximum), Stand-by and Automatic Mode.
A mode started automatically to remove moisture from the heat recovery unit. The drying takes
3 hours and the flaps of the heat exchanger are further turned over in intervals determined
Drying
by the dew point temperature. During this mode, the user comfort is not reduced; the air that
is supplied to the indoor space is warmer than the air that is exhausted. If the Boost function
is activated during drying, the forced exhaust time is limited to 2 min.
Too Low Outdoor
A mode started automatically when the outdoor temperature drops below -20 °C. Drying is
Temperature
carried out while the air exchange and ventilation are suspended.
sensors and controls the fan power based on the current values. The ventilation power
2
Tab. 3 – Operation modes
2
7