L690 freewheel normal-arm Silver

Freewheel normal arm L690 is used together with DC640 EMF electrohydraulic door closer. Recommended for fire doors where a free-running function is desired. Freewheeling means that there is no resistance (spring force) after the DC640 is connected to 24VDC. The door can now stand freely in all possible degrees without resistance, but always closes in the event of a power failure or fire alarm. DC640 must be connected to ABDL system.