62
ENGLISH
11. BOOST FUNCTION
A digital input allows forcing the unit’s normal operation state. The forcing duration is adjustable; the
timeout is set in the factory to 30 min.
Terminals are available in the box for the connection of the input (Boost, BT). Use of a potential free
contact.
12. FREE COOLING BY NIGHT
By default, this feature is disabled. To enable it is necessary to accesss from Advance Settings. This
function is used during the summer to cool off buildings during the night by using fresh outdoor air.
This allows reducing the need to resort to air conditioning during the day.
To use the free cooling by night function, the information received from the outdoor probe (fresh air)
and from the discharge temperature probe is used. These two probes are present and integrated in
the unit at the level of the taps.
The free cooling is only active if the start-up conditions are satisfi ed:
Start-up conditions:
• Less than 4 days have elapsed since the last start of the installation.
• The outdoor temperature during the previous operation period exceeded the force limit of 22°C
(1)
.
• It is between midnight 0:00 am
(1)
and 7:00 am
(1)
In the morning.
• The timer outputs for “normal speed”, “Extended running, Normal” and “External switch” are Off.
• A time program will be activated (“Start”) within the next 24 h.
If ALL the conditions are satisfi ed, the free cooling starts running. It runs for 3 minutes to make sure
that the temperature measurements are representative (by creating a movement of air in the ducts).
After three minutes, the controller checks the stop conditions:
Stop conditions:
• The outdoor temperature is above 18°C
(1)
or below 10°C
(1)
(risk of condensation).
• The discharge temperature is less than the stop value (18 °C).
• The time programs (timer) for the normal speed, normal force run and the outdoor control are set
to “Stop”.
• It is later than 7:00 am
(1)
in the morning.
If at least one of these conditions is satisfi ed after the fi rst three minutes of operation, then the unit
is again stopped.
When the free cooling function is active, the fans run at maximum speed (it is possible to reduce this
speed by setting the parameters); the coil and heat exchanger control outputs are switched off. The
heating output remains inhibited for 60 min
(1)
after the function is stopped.
To activate the Free Cooling Night function it is necessary to acces as adminstrator (see point 18).
(1) default values which can be changed by a parameter setting in ‘’expert mode’’.
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