Remote Stop-Start; Free Cooling By Night - S&P CADB/T-HE PRO-REG Series Instruction Manual

This function is not availble in VAV mode.
The activation of the Boost function has to be activated with an external switch. To activate, it is neces-
sary to close the contact between +C and BT for 3" and then open it.
Once the Boost function has been activated, to cancel the forced normal speed period, it is necessary
to do a Remote STOP-START (see point 11).

11. REMOTE STOP-START

It is possible to start-stop the unit by means of an external digital contact (see electric diagrams). The
contact closure between +C and ES, will produce the unit stop.
When the equipment is stopped remotely the control hand terminal displays an alarm messa-
ge, warning that it is possible that the unit will be start up from remote at any time.

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
• It is between midnight 0:00 am
• 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
• The discharge temperature is less than the stop value (18°C).
(1) and 7:00 am (1) In the morning.
(1)
or below 10°C
37
(1)
(risk of condensation).
(1) .