Mcr WIP type multi-blade fire dampers
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MERCOR SA –
the Company reserves the right to make modifications and changes.
4.DESIGN AND OPERATING PRINCIPLE OF THE FIRE DAMPER
Design
The mcr WIP type fire dampers consist of a housing with a rectangular cross section, movable partition made of an
assembly of blades rotating on their axes as well as a release and control mechanism, which is started remotely or
automatically (after a thermal release has been actuated). Fire dampers’ housings are made of galvanised steel
sheet, stainless steel sheet or acid-proof sheet. An integral part of the housing is a flange made of a fire-resistant
plate. Each damper blade is made of galvanised steel sheet, stainless steel sheet or acid-proof sheet with a
plasterboard inside. On inside of the housing, along the partition axis, an intumescent seal and ventilation seals
have been installed. The partition’s blades rotate on their axes which are made of steel pins. On the blades,
ventilation seals have also been installed. The blades are connected by means of a steel slat that provides the
drive.
Square and rectangular fire dampers have been equipped with flanged frames allowing to install them in ducts. In
the case of a round duct, a square fire damper is manufactured and equipped with a circular flanged connection or
a spigot is used.
Operation
The operating principle and behaviour of the mcr WIP type fire dampers depends on the version and application:
mcr WIP/S type fire dampers
These fire dampers remain open during normal operation. They are closed (safety position) in the following
ways:
•
automatically – by actuation of the thermoelectric release
•
manually – by pressing the control button on the thermoelectric release
•
remotely – by actuation of the axial electric actuator with a return spring as the supply voltage disappear
mcr WIP/V type fire dampers for fire ventilation systems
These fire dampers remain closed during normal operation. They are opened (safety position) in the following
ways:
•
remotely – by actuation of the axial electric actuator without a return spring as the supply voltage is
appropriately applied to the actuator
mcr WIP/M type fire dampers for mixed-mode fire ventilation systems
Depending on the function they serve, these fire dampers remain either closed or open during normal
operation. They are opened/closed (safety position) in the following ways:
•
remotely – by actuation of the axial electric actuator without a return spring as the supply voltage is
appropriately applied to the actuator
mcr WIP/T type transfer dampers
These dampers remain open during normal operation. They are closed (safety position) in the following ways:
•
automatically – by actuation of the thermoelectric release
•
manually – by pressing the control button on the thermoelectric release
•
remotely – by actuation of the axial electric actuator with a return spring as the supply voltage
disappears
mcr WIP/G type pressure relief dampers
These dampers remain open during normal operation. They are closed (safety position) in the following ways:
•
remotely – by actuation of the axial electric actuator with a return spring as the supply voltage
disappears. The actuator does not have a thermoelectric release.
It is possible to check manually the correct functioning of a fire damper with electric actuator for service purposes.
To do this, use a special hex key which should be placed in the socket marked on the actuator. Then, by rotating
the hex key, the fire damper’s partition may be set in the desired position. Bearing in mind to take enough care,
rotate the hex key uniformly and slowly. Too fast and violent rotation may cause damage to the internal mechanism
of the actuator or the power transmission system.
NOTICE
Never try to open or close a fire damper’s partition by pulling it directly. Such attempts may
cause damage to the self-locking powertrain of a fire damper and this is not covered by warranty.
