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The mode dened by the user interface has priority over the mode set by the communication bus
Caution
During a change of mode when the compressors are operating, the compressors must be stopped
for a period of 10 minutes before activating the new mode.
Caution
Outside air
Setpoint in Auto mode
Hysteresis Auto mode
Hysteresis / 2
Heating
Cooling
17SysAqua
To change the operating mode by an external contact, set the SysAqua to "Cool" mode. Indeed, if the
SysAqua is congured in "Heat" mode, opening the contact will not switch the unit to "Cool" mode. However,
in "Cool" mode, closing the contact will switch the SysAqua to "Heat" mode.
When the Auto mode is active, weather compensation is enabled in heat and cool mode is overridden with
the default values (Refer to the § WATER LAW, page 8).
3.2.2. AUTO MODE
If the Auto mode is selected, the operating mode will depend on the external ambient temperature according
to a temperature setting and a hysteresis.
Parameters Min Max défaut
Auto mode setpoint °C
18 23 20
Auto mode hysteresis K
4 8 5
The heat and cool mode will be selected as shown on the graph below:
² If the external ambient temperature exceeds the setpoint + half the hysteresis value (22.5°C by
default), the unit will change from heat to cool mode
² If the external ambient temperature falls below the setpoint - half the hysteresis value (17.5°C by
default), the unit will change from cool to heat mode
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