A Challenge for Swing Door Operators
A challenge for Swing Door Operators
Swing doors are often exposed to wind loads. Wind acts with full force on exterior door leaves while interior doors are committed to pressure differences caused by air conditioning systems, ventilation systems or the stack effect. With a surface of around 2 - 3 m², even average sized doors can be heavily affected by wind loads, which in turn have a negative effect on the proper driving behaviour of swing doors during their opening and closing cycles. Especially electrohydraulic operators, which close only via spring force, cannot respond flexibly to the prevailing weather conditions as their closing force is tied to their current spring force adjustment.
This results in:
The new electromechanical ED 100A and ED 250A swing door operators are equipped with DORMA wind-load control.
The system recognises and compensates wind loads with a force of up to 150 N (maximum admissible force). In addition, the motor supports the spring during closing cycles and the electronic latching action helps to close the door properly.
Furthermore, the wind load control actively changes the driving parameters in opening and closing direction in order to tailor the door's driving behaviour to the prevailing weather conditions.
Compared to electrohydraulic swing door operators up to size EN 6, our system
provides more than double the closing force for as long as the wind-load control
is activated. Thanks to this feature, the operator can easily cope with higher
Tests of an independent testing institute, performed in a
wind tunnel, show that the ED 100 is capable of opening and closing a door
several times at a frontal wind speed of 17 m/s - which is the maximum speed
this wind tunnel can generate. All tests have been performed at a door with a
width of 990 mm and a height of 2,250 mm.