Protection Of Heat Exchanger Unit; Fire Function (Fire) - S&P CADB/T-HE PRO-REG Series Instruction Manual

14. PROTECTION OF HEAT EXCHANGER UNIT

• When the exhausted air falls below +5ºC, it appears an ALARM in the display and the by-pass opens
• If the external (outdoor) temperature falls below -7ºC, then the supply fan stops, avoiding risk of
enter freezing air to the building.
• After 5 mins since the fan stopped, the unit checks the outdoor temperature, if it is higher than -7ºC
the unit switches on the supply fan again, else the fan keeps stop for a new period of 5 mins, and
again until the temperature is higher than -7ºC.

15. FIRE FUNCTION (FIRE)

It is possible to assign a digital input to the FIRE function. After receiving the signal from an external
fi re control unit,it will be forced a predetermined behavior of the heat recovery unit fans.
Input signal type: Potential free. It is supplied with a Bridge to avoid the appearance of the alarm
(Contact open = Alarm)
It is possible to assign the following behaviors:
Fire alarm strategies
Force the Supply fan runs (Extract fan stops)
Force the Extract fan runs (Supply fan stops)
Both fans running
Both fans stopped
In all cases, upon activation of the alarm, the display shows ALARM message.
Here's, how to confi gure the unit's operation after the fi re alarm has been activated:
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