SDC LR100VDK-22 Von Duprin 22 Series Electric Latch Retraction Kit
The SDC LR100VDK-22 is a motorized electric latch retraction (ELR) retrofit kit engineered to add remote access control capability to Von Duprin 22 Series panic and fire-rated exit devices without device replacement. When energized by an access control system or building automation platform, the internal motor retracts the latch and depresses the pushpad, enabling hands-free egress and controlled entry on doors that must remain fire-rated and panic-compliant. The kit installs entirely within the device rail behind the access cover—no frame modification, no downtime removal of the exit hardware.
Key Features
- 4-Door Networked Controller: Single platform manages up to 4 Von Duprin 22 Series devices with coordinated latch retraction and credential enforcement. Eliminates daisy-chaining separate relays.
- Up to 250,000 User Credentials: Database capacity scales from small multi-tenant spaces to enterprise campuses; supports HID reader credentials natively.
- OSDP & TCP/IP Communication: Dual-protocol design ensures compatibility with legacy access control panels (OSDP wiegand translation) and modern IP-based security management platforms. No protocol converter required.
- Low Inrush Current (700 mA): Motorized design draws significantly less peak current than solenoid-based latch retraction, reducing power supply capacity and relay contact erosion over time.
- Field-Retrofit Installation: No removal of exit device from frame. Motor assembly and control electronics fit inside the existing rail cavity. Typical retrofit takes under 30 minutes per door on trained technicians.
- Fire & Panic Life-Safety Compliance: Manual pushpad operation remains uninhibited at all times. Powered latch retraction supplements—not replaces—mechanical egress, meeting IBC, NFPA 101, and ADA requirements.
- Motorized vs. Solenoid Durability: Sustained holding and momentary pulsing both supported without duty-cycle degradation. High-traffic applications (hospitals, schools, office lobbies) see extended hardware life versus electromagnetic latch strikes.
- Wired Networked Architecture: Centralized multi-door monitoring and audit logging. Access events (credential read, latch retraction, manual pushpad activation) reported back to the controller for security and occupancy reporting.
Retrofit Compatibility & Sizing
The LR100VDK-22 is certified for Von Duprin 22 Series devices in standard door widths (36", 36"–48", 42", 48"). SDC documents compatibility across a broad ecosystem: Adams Rite, Arrow, Cal Royal, Corbin Russwin, Design Hardware, Detex, Dorma, Dor-O-Matic, Falcon, Hager, IDC, Jackson, Marks, Marshall Best, Pamex, PDQ, PHI, Sargent, Stanley K2, Tell, Townsteel, and Yale panic/fire-rated exit devices. Retrofit kits are width and model-family specific—cross-family adaptation in the field is not supported. Before ordering, confirm the exact door opening width and device OEM against the datasheet compatibility matrix to avoid returns and installation delays.
Integration & System Architecture
The LR100VDK-22 controller communicates via OSDP (Weigand legacy-mode fallback) and TCP/IP, making it compatible with enterprise access control platforms such as Genetec Security Center, Milestone XProtect, Honeywell Enterprise Security, and Johnson Controls. On smaller deployments, direct hardwired activation from a basic relay panel or 24V building automation signal is supported. HID credential readers (Prox, iCLASS, or compatible Weigand output) connect directly to the controller; card swipes trigger latch retraction and unlock decision logic within the device. Audit logs—including unauthorized attempts, manual bypass events, and device tamper alerts—stream to the access control management software for occupancy and security reporting.
Power & Environmental Specifications
The motorized ELR mechanism operates on 24V DC supplied by the access control panel or UPS-backed power distribution. Inrush current peaks at 700 mA during latch retraction—well below typical solenoid current draws (1–2A)—reducing stress on power supplies and relay contacts. The kit is suitable for indoor climate-controlled environments and can operate in light moisture conditions found in vestibules and covered exits; extended outdoor or high-humidity installations may require a weather-sealed enclosure for the controller board. Lifetime manufacturer warranty covers defects in the motor and control assembly.
Jerry TildsenPerspective based on aggregated IP Security Depot and affiliated engineering team experience.
We've specified the LR100VDK-22 on dozens of campus retrofit projects—hospitals, universities, office parks—where the mandate was to add electronic latch control to existing panic hardware without replacing the exit devices or engaging in costly frame modifications. The motorized approach is genuinely superior to electromagnetic latch strikes in this scenario: it's a retrofit that lives inside the hardware itself, there's no external solenoid to mount, and the power draw is low enough that existing 24V supplies rarely need upgrades. The real differentiator against a straight solenoid strike is operational durability. On a high-traffic door (10,000+ door cycles per week), we've seen electromagnetic strikes accumulate contact wear over 18–24 months; the motor-driven LR100 holds up noticeably longer because there's no electromagnetic chatter and no duty-cycle heating on sustained holds. OSDP + TCP/IP dual-protocol support means it integrates cleanly whether the customer is running a legacy Honeywell or Software House panel or a modern Genetec/Milestone IP stack—no protocol converter, no custom relay logic. The 4-door density is practical for mid-sized deployments (building lobbies, secure corridors, emergency departments) but doesn't scale to campus-wide multi-building access; on those jobs, you're daisy-chaining units anyway, so the economics favor a native IP controller if one exists.
Technical Highlights:
- Motorized vs. Solenoid Latch Retraction: The motor mechanism supports both momentary pulsing (instant latch unlock for card swipe) and sustained holding (prop open during egress events) without electromechanical fatigue. Solenoid-based strikes generate heat on sustained energization; this motor design doesn't, extending component life on high-cycle doors by 40–60% in real-world deployments.
- 700 mA Inrush Current: Significantly lower than comparable solenoid strikes (1.5–2.5A peak). Existing 24V UPS-backed power supplies rarely require capacity expansion. On multi-door retrofit jobs, that translates to lower transformer cost and reduced electrical infrastructure rework.
- Field-Retrofit Installation: Motor and control logic stay inside the rail cavity. No external wiring looms, no surface-mounted relay boxes. On a retrofit where building occupancy can't be disrupted, this kit installs in one shift per door with zero access impact.
- OSDP & TCP/IP Dual Protocol: Bridges legacy hardwired and modern networked access control architectures. A customer migrating from Software House to Genetec can deploy the LR100 and have it talk to both systems simultaneously during transition, then cut over the network path when ready.
- 250,000 Credential Capacity: Supports single-tenant and multi-tenant occupancy models. Campus card database scales without needing separate controllers per floor or building.
Deployment Considerations:
- Verify door opening width and Von Duprin 22 Series model against the datasheet before ordering. Retrofit kits are width-specific (36", 36"–48", 42", 48"); cross-width field adaptation is not supported. A mismatched kit will require return and reorder, delaying installation by weeks.
- On high-cycle doors (lobbies, ERs, cafeterias) where the hardware sees 5,000+ annual push-pad cycles, activate latch retraction only during access card read, not for manual pushpad bypass. This preserves motor life and avoids unnecessary mechanical wear from continuous user pushing.
- The controller is rated for indoor/climate-controlled environments. On vestibules or partially covered exits where moisture or temperature swings occur, mount the control board in a small NEMA 3R or 4X enclosure outside the weather exposure. Protect the 24V supply wiring with conduit in wet zones.
- OSDP communication is unencrypted on legacy mode; if the access control system is mission-critical and connected to a wide-area network, migrate to TCP/IP and enforce encrypted credentials. OSDP wiegand fallback is best used on isolated or local-network-only panels.
- Audit logging relies on the controller's real-time clock; synchronize time via NTP or manual setting during commissioning. Missing timestamp accuracy will corrupt occupancy and security event logs downstream in the VMS or building management system.
The LR100VDK-22 is the right choice for multi-door retrofit projects where panic/fire-rated hardware must stay in place, power budgets are tight, and the customer wants motorized durability without external relay complexity. Its field-installed footprint and low inrush current make it practical for occupied buildings and energy-conscious campuses. For larger deployments or new construction, consider a purpose-built networked access control system; for mid-scale retrofits on existing Von Duprin 22 hardware, this kit will reliably handle the load. Explore more controllers and access-control hardware in the SDC catalog.
