Adding Electric Latch Retraction With ACSI’s New Motor-Driven ELR Kit

We install the new ACSI 1550K-MDV Motor Drive Electric Latch Retraction Kit onto a Von Duprin XP99 Series Rim Panic Device that incorporates the patented two-piece latchbolt.


Architectural Control Systems Inc. (ACSI) has introduced the 1550K-MD Motor Driven Electric Latch Retraction (ELR) Kits for push bar-equipped exit devices. ACSI ELR’s are designed to retract the push bar, putting the exit device into the dogged condition, with the latch either retracted or disengaged. The 1550K-MD Kits can provide momentary or maintained operation (electrically dogged).

ACSI Motor Driven Electric Latch Retraction Kits incorporate a screw drive mechanism to unlock the exit device, permitting free egress and access. Using a high speed motor in place of a solenoid makes it possible to provide similar operational times, while significantly reducing the sound that can occur when the push bar is retracted.

The ACSI ELR Kit is installed onto the exit device base plate with motor’s screw driven mechanism connected at the rear of the assembly mechanism. When the ELR is powered, the screw drive retracts the base plate assembly mechanism, placing the exit device into the unlocked condition.

For power, the ACSI Motor Driven Electric Latch Retraction Kits require a 24VDC 1Amp minimum, filtered and regulated power supply. The current requirement for the ELR is one Amp maximum inrush and 400mA maximum holding current for electronic dogging.

To bring power to the ELR, an electric hinge can transfer power from the jamb to the door. Power to the device is through non-polarized leads, eliminating the possibility of short circuiting the electronics.

UL Listed ACSI 1550K-MDs are for use on fire rated and panic exit devices. To meet fire rated applications, the exit device must relock when power to the ELR is removed. This means when power is removed, the motor must automatically reverse operation, permitting the push bar and latch to return to the locked condition. Locksmiths can install ACSI Motor Driven Electric Latch Retraction Kits, maintaining the UL Listing of a fire rated exit device.

Important: Before installing an Electric Latch Retraction Kit into an exit device, make certain the door, door closer and exit device are in proper adjustment and properly operate.

For this article, we will install a ACSI 1550K-MDV Motor Drive Electric Latch Retraction Kit into a Von Duprin XP99 Series Rim Panic Device that incorporates the patented two-piece latchbolt. The ACSI 1550K-MDV Motor Drive Electric Latch Retraction Kit will also operate the Von Duprin 98/99 Series and the 33A and 35A Series Exit Devices. The 99 Series and XP99 Series Exit Devices have the grooved mechanism cases.

Note: When installing the ACSI ELR onto a Von Duprin 98/99, the dogging mechanism must first be removed.

The 1550K-MDV Kit is mounted onto the Von Duprin XP99 exit device baseplate, replacing the mechanical dogging mechanism on a panic device. The kit installs onto the baseplate using the two dogging mechanism mounting holes, eliminating the need to drill any holes. The motor-driven Connecting Link incorporates two hook-like arms that attach to the baseplate’s mechanism. When the ELR is powered, both the latch and the push bar are retracted.

Patented Von Duprin XP98 and XP99 models have a two-piece pivoting latchbolt and deadlatch mechanism that attains 90 degree strike to latchbolt contact when subjected to an attack. The XP design delivers 2000+ pounds static load force resistance against unauthorized access. This configuration helps prevent unauthorized entry by resisting repeated attacks. The two-piece pivoting latchbolt design requires 25 percent less pressure on the push bar to release the latchbolt on doors with pre-load.

The XP98/XP99 center case operates differently from the 98/99 Series Exit Devices. When the door is closed and the latch bolt is in the locked condition, pressing the push bar releases the blocking mechanism, permitting the latchbolt to pivot over the roller strike, as the door is swung open. Unlike conventional exit devices, the XP latchbolt does not retract when the push bar is pressed. The blocking mechanism remains in the released condition until the door is closed and the deadlatch mechanism has retracted. When the blocking mechanism engages, the latchbolt becomes locked.

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