The Assa Abloy DC700-D9005 operates on a sophisticated hydraulic system, central to its controlled door closure. The internal hydraulic fluid, regulated by precisely engineered valves, dictates the door's movement dynamics. The primary valve controls the *closing speed*, managing the door's velocity from its maximum opening angle (up to 160°) down to the final latching phase. A secondary, independent valve governs the *latching speed*, providing a critical burst of power just before the door closes fully, ensuring positive engagement with the lock or latch without slamming. This dual-valve system allows installers to fine-tune the door's behavior, optimizing both accessibility and security. The inclusion of *back-check* is a vital protective feature; upon vigorous opening, a hydraulic cushion engages beyond a certain angle (typically around 70-80°), preventing the door from violently striking adjacent walls or objects, thereby protecting the door, frame, and hardware. Furthermore, the *delayed action* function holds the door open for an extended period before initiating closure, a critical feature for high-traffic areas or for accommodating individuals with mobility impairments, improving egress and ingress flow. The non-handed design, achieved through symmetrical hydraulic valving and arm geometry, simplifies inventory management and installation, as the unit can be mounted on either left or right-hand doors in various configurations (e.g., standard, parallel arm, top jamb).
The EN1154 certification is paramount for the Assa Abloy DC700-D9005, affirming its conformity to the European standard for controlled door closing devices. This certification mandates rigorous testing for durability, efficiency, and safety. For fire-rated doors, as is the intended use for the DC700-D9005, EN1154 compliance is non-negotiable, ensuring the closer's ability to reliably shut and latch the door, even under fire conditions, thereby maintaining compartmentation and inhibiting the spread of fire and smoke. The closer's design, specifically its "hold-open function: false" status, is crucial for fire safety as it ensures the door will always close automatically, preventing it from being wedged open and compromising fire separation. The adjustable power size, ranging from EN3 to EN6, allows for precise force selection to match specific door dimensions (up to 1400mm width) and weights, a key aspect of EN1154 where the specified power size must correspond to the door mass and width for optimal performance and safety. While a specific cycle test rating is not provided, EN1154 typically requires a minimum of 500,000 cycles for closers used on fire and smoke control doors, implying a robust design for sustained performance in commercial environments. Adherence to DIN18040 (Accessibility) and CEN/TR15894 (Guidance on Selection) further underscores its suitability for inclusive design and informed application. The robust steel/aluminium construction (net weight 2.7kg) ensures the mechanical integrity required to withstand operational stresses over its lifecycle.
