5.19.2 Fire / smoke / emergency off
Configured binary input: Smoke extract
Within first phase of a fire situation, it can be assumed that ventilation may be used
to help the prevailing situation, thus functionality is different from temperature
driven fire alarm coming from temperature measurement, fire damper indication, or
dedicated emergency off signal.
Depending on the requirements, ventilation unit can be set to react on an active
signal 4 different ways:
●
Both fans would be switched to 100% speed in case of active alarm, fire
dampers remain open.
●
Both fans would be switched to 0% speed in case of active alarm, fire damper
is closed.
●
Supply fan would be switched to 100% speed and exhaust fan to 0% speed.
●
Supply fan would be switched to 0% speed and exhaust fan to 100% speed.
Configured binary input: Emergency off
●
Switches off both fans and closes the outside air dampers immediately.
Since ventilation operation is a reaction to A-Alarm situation, the defined function
will only be stopped after A-Alarm is reset and acknowledged. Or the controlling
components are destroyed.
Available parameters
Current values
BACnet object
R/RW
Note
Fire/smoke alarm status
Smext
BI,81 (D1)
BI,98 (D2)
BI,115 (X3)
BI,132 (X8)
R
Reaction as
configured in
SmextMod
Emergency off status
EmgOff
BI,80 (D1)
BI,97 (D2)
BI,114 (X3)
BI,131 (X8)
R
Plant shutdown
Basic settings
BACnet object
R/RW
Note
Smoke extract plant operation
SmextMod
MVAL,125
RW
1: Both fans 100%
2: Both fans 0%
3: Supply 100%, exhaust 0%
4: Supply 0%, exhaust 100%
Application functionalities
Safety functions (SftyCtl11y)
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