The ASSA ABLOY CT1800 represents a meticulously engineered hydraulic mechanism designed for superior door control. At its core, the unit employs a robust rack-and-pinion system submerged within a precisely calibrated hydraulic fluid chamber. As the door opens, kinetic energy is transferred to the hydraulic piston, compressing the fluid. Upon release, the controlled return flow of this fluid through adjustable valves dictates the door's closing and latching speeds. This fluid dynamics principle allows for smooth, consistent deceleration, preventing slamming and ensuring full closure. The steel body construction provides a stable housing for these critical components, protecting them from operational stresses and environmental factors, thus contributing to the unit's longevity.
Compliance with EN 1154 CE is a cornerstone of the CT1800's design. This European standard specifically regulates controlled door closing devices, mandating rigorous testing for durability, closing force efficiency, and operational stability across various temperatures. For the CT1800, this certification directly validates its suitability for fire doors, ensuring that in the event of a fire, the closer will reliably return the door to its fully closed and latched position, maintaining compartmentation and inhibiting smoke and flame spread. The EN 1154 certification encompasses performance integrity over a substantial number of cycles, underscoring its readiness for high-traffic environments.
Precision door control is achieved through independent, variable valve adjustments for both the closing speed (from maximum opening angle to approximately 15°) and the latching speed (the final 15° to closed). This dual-valve system allows installers to fine-tune the door's behavior, ensuring sufficient momentum for secure latching without excessive force that could damage the door frame or cause user discomfort. The multi-position power size selection (EN 2, 3, or 4) further tailors the closing force to specific door dimensions and weights (e.g., EN 2 for lighter doors, EN 4 for heavier doors up to 80 kg/1100 mm), optimizing energy efficiency and operational smoothness. While lacking back-check, hold-open, or delayed action, the CT1800's focused design excels in its primary function: delivering uncompromised, adjustable, and safety-compliant door closure.
