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Electric control units
 

- Modular and single-zone control boxes
- Electric daily ventilation control boxes
- Electric cylinders
- Manual chain operators
- Electric accessories

Choosing an electric control unit

They can be installed:
Electric control units IN OPENING ONLY FITTINGS,
- IN OPENING/CLOSING FITTINGS.

Single activation control can be by current injection or break.

Opening/closing control is usually by current injection.

Combined smoke exhaust/daily ventilation control must be in opening/closing mode.

When operating by current break, it is desirable to provide an uninterruptible power supply in order to avoid the untimely opening of smoke vents or ventilation openings. For operation by current flow, the power supply must be uninterruptible and the power lines must be monitored (IT 247).

THE BENEFITS OF ELECTRIC INSTALLATIONS

- Stand-alone activating fire detection installations controlled by smoke ventilation zone, and/or by daily ventilation unit.
- Graduated or non-graduated ventilation possible at no extra cost.
- Travel lengths and any contours in them have no impact on the performances of the installations.
- Operating flexibility to fit perfectly with the restrictions of contemporary buildings.
- IInstallations which can be connected to fire systems and centralised technical management (CTM) systems:

  • remote-control;
  • servo-control by detection;
  • remote indication.

- No maintenance: only the batteries require periodic checks and replacement.
- Electrical energy always present, and installation with improved aesthetics.

RESTRICTIONS ON USE

- Avoid overly long distances between boxes and stand-alone fire activated safety devices leading to large wire cross-sections.

RECOMMENDATIONS

- The smoke exhaust function always takes priority over the daily ventilation function.
- Choose cylinders according to the forces needed to open and close the ventilator.
- Choose a C2-type cable (non fire resistant) if the Adaptive Control System (DAC) and stand-alone fire activated safety device (DAS) are located in the same zone. Otherwise chose a CRI-type cable (fire resistant).
- The cable cross-section depends on the distances to be covered and the number of cylinders to be controlled.
- Try hard to produce an inspectable installation for maintenance purposes.

The main parameters to consider are:

ACCESSIBILITY/MARKING OF MATERIALS (NF S 61-932, 10-2). Control units must not be hidden by an open door, etc. Marking symbols must comply with standard NF ISO 6309, signal no.1.

REMOTE RESETTING OF SAFETY DEVICES (NF S 61-932, 8-2-4). Mandatory for any smoke ventilator and any facade opening for which the resetting unit is located more than 3m away on the closest floor. The unit used to reset the ventilator must be located in the zone where the safety devices are installed. This unit must be accessible only by authorised persons and emergency services (at least access level 1).

INSTALLING CONTROL UNITS (NF S 61-932, 8-2). The unit used to control the safety device must be located at least 180cm above floor level. When this unit is accessible at authorisation level 0, all the devices must be located together near to a main access way leading into the space in question.

OPENING TIME (NF EN 12101-2). As soon as the order for a remote-controlled system by stand-alone fire activated safety device is acceptance checked, the safety device must automatically be placed in safety position in under 60 seconds.

ELECTRICAL CONECTIONS (NF S 61-932, 6-1-2). Monitoring of remote-control lines is mandatory for any control by current injection, in DC and supply disconnection mode.

ELECTRICAL CONECTIONS (NF S 61-932, 6-1-3). Minimum cable cross-sections: minimum 1.5m2 for single-core cables; minimum 1.0mm2 for multi-core cables.

REMOTE-CONTROL LINES (NF S 61-932, 6-1-3). Lines for remote-control by current injection must consist of:
- either CR1 category cables (according to standard NF C 32-070);
- or C2 category cables, if inside protected pathways.
These obligations no longer apply as soon as they enter the fire-protected area (Zone de mise en Sécurité/ZS) corresponding to the stand-alone fire activated safety devices which they servo-control. The lines remote-controlled by current break must consist of C2 category cables or over.

CONTROL LINES (NF S 61-931, 6-1-4). They may use the same cables as the remote-control lines. The provisions concerning the cable categories (CR1 or C2) also apply to the control lines.

 
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