​ PDQ 7101 DSHO Door Closer - Heavy Duty Door Stop and Hold Open Arm  

                                                               *** Retrofits LCN 4040XP and 4041 closer (Same Hole Pattern & Closer Arms) ****

The PDQ 7101 DSHO is an elite, industrial-grade Surface Mounted Door Closer specifically engineered for high-traffic environments that require both physical swing-limiting and temporary positioning. As a Grade 1 certified hardware solution, this closer is designed to withstand the rigors of institutional use in schools, hospitals, and commercial centers. Crucially, the 7101 DSHO retrofits LCN 4040XP and 4041 closers, utilizing the exact same hole pattern and closer arms, allowing for a seamless, high-performance upgrade without the need for additional drilling or door modification.

The DSHO (Dead Stop Hold Open) parallel arm is a dual-purpose maintenance and accessibility solution. It features a built-in mechanical stop to prevent the door from swinging past a set angle, protecting the frame and adjacent walls, while also providing a thumbturn-activated Hold Open function. This is the premier choice for facilities that need to keep doors open for deliveries or high-volume pedestrian flow while maintaining the structural protection of a heavy-duty dead stop.

DSHO Parallel Arm & Backcheck Function Summary

The Dead Stop Hold Open (DSHO) and Backcheck (BC) features provide total control over the door's opening arc and stationary positioning:

• Dead Stop (DS) Function: The arm incorporates a heavy-duty physical stop that halts the door at a predetermined point (usually 90° or 110°). This eliminates the need for floor stops, which can be tripping hazards, or wall stops that may fail under high-impact use.
• Hold Open (HO) Function: The arm includes a mechanical mechanism that allows the door to be held in the open position. This is ideal for high-traffic transition periods or moving equipment through an opening without manual assistance.
  
• Adjustable Backcheck (BC): This hydraulic "cushion" begins at roughly 70° of the opening cycle. It creates resistance to slow the door down, preventing it from being flung open with enough force to damage the hinges or the dead stop itself.
• Sweep and Latch Valves: Two independent valves control the closing speed from fully open to 10° (Sweep) and the final 10° to the frame (Latch), ensuring a quiet, secure close every time the hold-open is disengaged.

Technical Specifications

Engineered Solutions for Modern Facilities

The PDQ 7101 DSHO provides strategic solutions for common commercial doorway challenges:

• Drop-In Replacement for LCN: By matching the footprint and arm geometry of the LCN 4040XP and 4041, this closer allows maintenance teams to upgrade facility hardware in minutes. It is the perfect solution for replacing leaking or worn LCN units while reusing existing door prep.
• Protects Door Infrastructure: In high-wind areas or hallways prone to abuse, the Dead Stop arm prevents the door from "over-swinging," which typically leads to bent hinges, cracked door frames, and damaged drywall.
• Enhanced Operational Flexibility: The Hold Open feature is a vital convenience for staff moving carts or during peak traffic times. When the hold-open is disengaged, the Grade 1 closer takes over to ensure the door remains a secure fire barrier.
• ADA Accessibility Compliance: With an adjustable spring range of Size 1 to 6, this closer can be fine-tuned to meet Americans with Disabilities Act (ADA) opening force requirements (5 lbs for interior doors) while remaining strong enough to close heavy exterior doors against wind or stack pressure.
• All-Season Hydraulic Stability: Utilizing high-performance fluid, the PDQ 7101 maintains consistent closing speeds regardless of extreme temperature fluctuations, preventing the door from "slamming" in summer or "drifting" in winter.