Electrify compatible Von Duprin 22 Series exit devices with the ACSI 1550K-MDV22 Motorized Latch Retraction and Dogging Kit.

Designed specifically for Von Duprin 22 Series panic hardware, the 1550K-MDV22 provides quiet 24VDC motor-driven latch retraction, allowing the exit device to be remotely unlocked through an access-control system, automatic door operator, time schedule, or remote release.

When energized, the motor retracts the latch while simultaneously depressing the pushbar into the dogged position for controlled free passage.

Key Features

• Genuine ACSI – Architectural Control Systems

• Model 1550K-MDV22

• Series 1550K-MD

• Specifically designed for Von Duprin 22 Series exit devices

• Motorized electric latch retraction

• Simultaneous latch retraction and electric dogging

• 24VDC ±10%

• 1A maximum inrush

• 400mA maximum holding current

• Continuous-duty rated

• Quiet motorized operation

• Low power consumption

• Non-polarized wiring leads

• On-board diagnostic LEDs

• Automatic retry function

• Field-installable kit

• Factory installation available

• UL listed for compatible panic exit hardware

• UL listed for compatible fire exit hardware

• Compatible with access-control systems

• Compatible with automatic door operators

• Exit device sold separately

Von Duprin 22 Series Compatibility

The MDV22 suffix identifies this kit specifically for:

Von Duprin 22 Series Exit Devices

This kit should not be confused with:

1550K-MDV

which is designed for Von Duprin:

• 33A Series

• 35A Series

• 98 Series

• 99 Series

Important

Use the 1550K-MDV22 specifically for compatible Von Duprin 22 Series hardware.

Motorized Latch Retraction

When 24VDC power is applied, the internal motor retracts the exit-device latch.

This allows the opening to be electronically unlocked without requiring someone to manually depress the pushbar.

Motorized latch retraction is especially useful for:

• Access-controlled entrances

• Automatic door operators

• Scheduled unlocking

• Remote release

• Building automation systems

Simultaneous Electric Dogging

The 1550K-MDV22 provides:

Latch Retraction + Electric Dogging

When energized, the pushbar is held in the depressed position while the latch remains retracted.

This allows the opening to operate in a free-passage condition for as long as the system remains energized.

When power is removed, the exit device returns to its normal mechanical operation.

Electrical Requirements

Operating Voltage: 24VDC ±10%

Maximum Inrush Current: 1A

Maximum Holding Current: 400mA

Leads: Non-Polarized

The kit requires a:

Filtered and Regulated 24VDC Power Supply

Proper power-supply sizing is critical for reliable latch retraction.

Continuous-Duty Operation

The 1550K-MDV22 is:

Continuous-Duty Rated

This allows the device to remain electrically retracted for extended authorized unlock periods when powered by a properly sized power supply.

Typical applications include:

• Business-hours unlocking

• Scheduled access

• High-traffic entrances

• Automatic door systems

Quiet Motorized Operation

The ACSI motor-drive design provides quieter operation than many traditional high-inrush solenoid latch-retraction systems.

This makes the kit well suited for:

• Schools

• Hospitals

• Healthcare facilities

• Offices

• Libraries

• Hotels

• Institutional buildings

Automatic Retry

The 1550K-MDV22 incorporates an:

Automatic Retry Function

If the pushbar does not successfully retract during the first attempt, the system can attempt another retraction cycle.

ACSI's diagnostic logic allows up to:

2 Retraction Attempts

before indicating an operational fault.

On-Board Diagnostic LEDs

Integrated diagnostic indicators assist with installation and troubleshooting.

The electronics include:

• Green – Power

• Yellow – Sensor

• Red – Error

These indicators can help diagnose:

• No power

• Normal operation

• Failed retraction

• Jam conditions

• Pushbar extension problems

• Low input voltage

• Electronic faults

Field-Adjustable Latch Retraction

The motor assembly incorporates an adjustment screw that allows the installer to fine-tune latch retraction.

ACSI recommends setting electric latch retraction approximately:

1/16" Less Than Mechanical Latch Retraction

to reduce the risk of over-travel and damage.

Device Length Compatibility

The kit is designed for standard Von Duprin 22 Series devices.

Standard 36" Device

Maximum allowable device cutoff:

4"

Standard 48" Device

Maximum allowable device cutoff:

10"

Verify actual device length before installation.

Recommended Wire Size

Wire gauge should be selected according to the distance between the power supply and exit device.

2-Conductor Wire Run

• 70 ft – 22 AWG

• 110 ft – 20 AWG

• 180 ft – 18 AWG

• 280 ft – 16 AWG

• 450 ft – 14 AWG

• 720 ft – 12 AWG

Voltage drop should be considered when designing the system.

Access-Control Integration

The 1550K-MDV22 can be integrated with compatible:

• Card readers

• Keypads

• Access-control panels

• Time schedules

• Remote release switches

• Building management systems

• Door-control relays

• Automatic door operators

Automatic Door Operator Applications

The kit is especially useful when a Von Duprin 22 exit device is installed on a door with an automatic operator.

A typical operating sequence may be:

1. Access credential is accepted

2. 1550K-MDV22 receives 24VDC

3. Exit-device latch retracts

4. Pushbar moves into the dogged position

5. Automatic door operator activates

6. Door opens

7. Door closes after the operating cycle

8. Power is removed and the exit device returns to secure operation

Proper control sequencing is required.

Panic & Fire Exit Hardware

The ACSI 1550K-MD platform is UL listed for compatible:

• Panic exit hardware

• Fire exit hardware

Important

When used on a fire-rated opening, the complete door assembly must maintain its required listing, including:

• Door

• Frame

• Exit device

• Electrification

• Power supply

• Wiring

• Control system

Field-Installable Kit

The K designation identifies the 1550K-MDV22 as a:

Field-Installable Kit

Installation involves accessing the Von Duprin 22 Series baseplate and pushbar mechanism and replacing or interfacing with the existing dogging components.

Professional installation by a qualified commercial-door or access-control technician is recommended.

Manual Dogging Consideration

If an existing manual dogging assembly is present, ACSI installation instructions require that it be removed during installation of the motorized kit.

The motorized system then provides electric dogging functionality.

Exit Device Not Included

This listing is for the:

ACSI Motorized Latch Retraction Kit Only

It does not include the complete Von Duprin 22 Series exit device.

Common Applications

Ideal for:

• Access-controlled doors

• Automatic door entrances

• Schools

• Universities

• Hospitals

• Healthcare facilities

• Government buildings

• Office buildings

• Retail facilities

• Institutional buildings

• Scheduled unlocking systems

• Remote release applications

• High-traffic commercial entrances

Product Specifications

Brand: ACSI
Manufacturer: Architectural Control Systems, Inc.
Series: 1550K-MD
Model: 1550K-MDV22
Compatible Exit Device: Von Duprin 22 Series
Product Type: Motorized Latch Retraction / Dogging Kit
Voltage: 24VDC ±10%
Maximum Inrush Current: 1A
Maximum Holding Current: 400mA
Duty Rating: Continuous
Operation: Electric Latch Retraction and Dogging
Motorized: Yes
Automatic Retry: Yes
Retraction Attempts: Up to 2
Diagnostic LEDs: Yes
Leads: Non-Polarized
Field Installable: Yes
Factory Installable: Yes
Panic Hardware Listed: Yes
Fire Exit Hardware Listed: Yes
Exit Device Included: No

What's Included

Typical kit includes:

• ACSI motorized latch-retraction assembly

• Motor mounting bracket

• Connecting link

• Device-specific connecting components

• Wiring leads

• Installation hardware

• Technical assistance labels

Exact kit contents may vary with manufacturing revisions.

Not Included

• Von Duprin 22 Series exit device

• 24VDC power supply

• Power transfer

• Access-control panel

• Card reader

• Keypad

• Automatic door operator

• Control relay

• Field wiring

• Door

• Frame

• Installation labor

Important Ordering Information

Before ordering, verify:

• Exit device is a Von Duprin 22 Series

• Exact exit-device configuration

• Device length

• Amount device has been cut down

• Rim or vertical-rod configuration

• Existing dogging configuration

• 24VDC power-supply capacity

• Wire length and gauge

• Automatic-operator sequence, if applicable

• Panic or fire-exit application

Important

1550K-MDV22 = Von Duprin 22 Series

Do not substitute the 1550K-MDV, which is intended for Von Duprin 33A/35A and 98/99 Series devices.