FIRE DAMPERS
364
365
Design changes reserved
OPERATING INSTRUCTIONS
DAMPER OPEN
(PRESS LEVER TO CLOSE)
DAMPER CLOSED
(TURN HANDLE TO OPEN)
CLOSED
OPEN
FDC25-R cylindrical fire damper with manual mechanism
Fire damper is shipped with closed damper blade. Fire damper with manual actuating mechanism is open by turning handle counter-
clockwise. Test of damper function is performed by pressing on a specified place on a lever, or by supplying solenoid with an current
impulse. Fire damper can be optionally equipped with limit switches.
Limit switches used on fire dampers give indication of damper blade position. Relays or indicator lights for fire alarm systems can be
used up to the maximum switch rating (Table 1.). One limit switch is required for damper blade position OPEN and one for CLOSED.
Fire dampers with a fusible link can be supplied with one or two limit switches, switches can also be fitted later.
DAMPER OPEN
DAMPER CLOSED
Fire damper is shipped with closed damper blade. Fire damper with manual actuating mechanism is open by turning handle counter-
clockwise. Test of damper function is performed by pressing on a specified place on a lever. Fire damper can be optionally equipped
with limit switches.
Limit switches used on fire dampers give indication of damper blade position. Relays or indicator lights for fire alarm systems can be
used up to the maximum switch rating (5A). One limit switch is required for damper blade position OPEN and one for CLOSED. Fire
dampers with a fusible link can be supplied with one or two limit switches, switches can also be fitted later.
CLOSED
OPEN
LIMIT SWITCHES
WIRING SCHEME
Red
Blue
Black
Blue
Black
N(-)
L(+)
Blue
Black
L(+)
N(-)
1
Limit switch
2
Signal light
3
Closing switch
4
Solenoid actuator
CLOSED
OPEN
CLOSED
OPEN
2
3
4
N(-)
L(+)
1
Fire damper in open position
FDC25-E cylindrical fire damper with solenoid actuator
