4
Parts and function
Fire dampers are used as safety related components in
ventilation systems. The fire damper is used as a shut-
off device to prevent fire and smoke from spreading
through ducting. During normal operation the damper
blade is open to enable air passage through the ventila-
tion system.
If the temperature increases in the event of a fire, the
damper blade closes. Closure is triggered at 72 °C
( 95 °C in warm air ventilation systems). If the damper
blade closes due to a temperature increase (i.e. in the
event of a fire), it must not be reopened.
To ensure proper functioning of the fire damper, a test
can be carried out.
Ä
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4.1
FKRS-EU with fusible link
Fig. 4: FKRS-EU with fusible link
①
Casing
②
Fusible link
③
Damper blade with seal
④
Inspection access
⑤
Lip seal
⑥
Handle with interlock and damper blade position
indicator
⑦
Release mechanism
Functional description
In fire dampers with a fusible link, damper closure is
triggered by the fusible link. If the temperature inside the
fire damper rises to 72 °C or 95 °C, the fusible link trig-
gers a coil spring mechanism. The coil spring mecha-
nism then causes the fire damper to close.
As an option, the fire damper can be either supplied or
subsequently fitted with one or two limit switches. The
limit switches can signal the damper blade position to
the central BMS or fire alarm system. One limit switch
each is required for damper blade positions OPEN and
CLOSED.
4.2
FKRS-EU with spring return
actuator
Fig. 5: FKRS-EU with spring return actuator
①
Casing
②
Temperature sensor
③
Damper blade with seal
④
Inspection access
⑤
Lip seal
⑥
Spring return actuator
⑦
Thermoelectric release mechanism
Functional description
The spring return actuator enables the motorised
opening and closing of the damper blade; it can be acti-
vated by the central BMS. As long as power is supplied
to the actuator, the damper blade remains open. In the
event of a fire, the internal thermoelectric release mech-
anism closes the damper blade when at least one of the
following is true:
Temperature in the fire damper > 72 °C or > 95 °C
Ambient temperature outside the release mecha-
nism > 72 °C
The power supply is interrupted (power off to close)
As standard, the spring return actuator is equipped with
limit switches that can be used to indicate the damper
blade position.
Parts and function
FKRS-EU with spring return actuator
Fire damper Type FKRS-EU12
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