Electrify compatible Falcon 24 and 25 Series exit devices with the ACSI 1550K-MDF Motorized Latch Retraction and Dogging Kit.

Designed specifically for Falcon panic and fire exit hardware, the 1550K-MDF provides quiet 24VDC motorized latch retraction, allowing the exit device to be remotely unlocked through an access-control system, automatic door operator, time schedule, or remote-release circuit.

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-MDF

• Series 1550K-MD

• Specifically designed for:

  • Falcon 24 Series

  • Falcon 25 Series

• Motorized electric latch retraction

• Simultaneous latch retraction and electric dogging

• 24VDC ±10%

• 1A maximum inrush current

• 400mA maximum holding current

• Continuous-duty rated

• Quiet motorized operation

• Low power consumption

• Non-polarized wiring leads

• On-board diagnostic LEDs

• Automatic retry

• Field-installable kit

• Factory installation available

• Interfaces with access-control systems

• Compatible with automatic door operator applications

• UL listed for compatible panic exit hardware

• UL listed for compatible fire exit hardware

• Exit device sold separately

Falcon Exit Device Compatibility

The MDF suffix identifies this ACSI kit specifically for:

Falcon

• 24 Series

• 25 Series

Important

ACSI manufactures several different 1550K-MD motor-drive kits.

Each suffix is designed around a specific exit-device family.

The 1550K-MDF should only be used with compatible Falcon 24 or Falcon 25 Series exit devices.

Motorized Latch Retraction

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

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

Typical controls include:

• Card readers

• Keypads

• Access-control panels

• Remote release switches

• Time schedules

• Building management systems

• Automatic door operators

Simultaneous Electric Dogging

The 1550K-MDF provides:

Electric Latch Retraction + Electric Dogging

When energized:

1. The latch retracts

2. The pushbar depresses

3. The pushbar remains in the dogged position

4. The opening operates in a free-passage condition

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

Electrical Requirements

Operating Voltage: 24VDC ±10%

Maximum Inrush Current: 1 Amp

Maximum Holding Current: 400mA

Wiring Leads: Non-Polarized

The kit requires a:

Filtered and Regulated 24VDC Power Supply

A properly sized power supply is critical for dependable latch-retraction performance.

Recommended Power Supply

ACSI recommends compatible:

Series 1400 Power Supplies

for motorized exit-device applications.

Power-supply sizing should account for:

• Number of electrified exit devices

• Simultaneous operation

• Wire length

• Wire gauge

• Voltage drop

• Additional system loads

Continuous-Duty Operation

The 1550K-MDF is:

Continuous-Duty Rated

This allows the exit device to remain electrically retracted during extended authorized unlock periods when properly powered.

Typical applications include:

• Business-hours unlocking

• Scheduled free passage

• High-traffic commercial entrances

• Automatic-door systems

• Institutional facilities

Quiet Motorized Operation

The motor-drive system provides quieter operation than many conventional high-inrush solenoid latch-retraction systems.

This makes it especially useful in:

• Hospitals

• Healthcare facilities

• Schools

• Universities

• Libraries

• Offices

• Hotels

• Institutional facilities

Automatic Retry

The 1550K-MDF incorporates:

Automatic Retry

If the pushbar cannot successfully reach the electrically dogged position because of temporary binding or resistance, the electronic control can attempt another retraction cycle.

On-Board Diagnostic LEDs

Integrated indicator lights assist installers and technicians with setup and troubleshooting.

The system uses:

• Green – Power

• Yellow – Sensor

• Red – Error

The indicators help identify operating conditions such as:

• No power

• Normal latch retraction

• Failed pushbar retraction

• Jammed hardware

• Pushbar extension problems

• Low input voltage

• Electronics faults

Retraction Adjustment

The motor assembly includes an:

Adjustment Screw

which allows the technician to fine-tune the amount of electric latch retraction.

ACSI recommends setting the electric operation approximately:

1/16" Less Than Mechanical Latch Retraction

to reduce the risk of over-travel and damage to the exit device.

Device Length Compatibility

Before installing the kit, verify how much the existing Falcon device has already been shortened.

Standard 36" Device

Maximum Allowable Cutoff: 1-1/2"

Standard 48" Device

Maximum Allowable Cutoff: 7-1/2"

Important

A device shortened beyond these limits may not provide enough internal space for the motor-drive assembly.

Recommended Wire Size

For a two-conductor 24VDC circuit, ACSI provides the following general wiring recommendations:

• 70 ft – 22 AWG

• 110 ft – 20 AWG

• 180 ft – 18 AWG

• 280 ft – 16 AWG

• 450 ft – 14 AWG

• 720 ft – 12 AWG

System designers should also account for voltage drop and any other connected loads.

Manual Dogging Removal

If the Falcon exit device currently has manual dogging, the installation procedure calls for removal of the existing manual dogging components.

The 1550K-MDF then provides the:

Electric Dogging Function

A supplied hole plug is used for the former manual dogging opening where applicable.

Field-Installable Kit

The K in 1550K-MDF identifies the product as a:

Field-Installable Kit

Installation requires access to the exit-device channel and pushbar assembly.

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

Factory Installation Available

The same motorized latch-retraction system can also be factory installed when ordering a compatible Falcon exit device through ACSI.

Factory modification may be preferable for new installations where the electrification can be completed before the hardware arrives at the jobsite.

Access-Control Integration

The 1550K-MDF can interface with compatible:

• Access-control panels

• Card readers

• Keypads

• Timers

• Remote release switches

• Relays

• Building automation systems

• Automatic door operators

Automatic Door Operator Applications

The 1550K-MDF is particularly useful where a Falcon exit device is installed on a door equipped with an automatic operator.

A typical operating sequence may be:

1. Credential is accepted

2. 1550K-MDF receives 24VDC

3. Exit-device latch retracts

4. Pushbar reaches the dogged position

5. Automatic operator activates

6. Door opens

7. Door completes its cycle

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

Proper sequencing is important so the operator does not attempt to open the door before latch retraction is complete.

Panic & Fire Exit Hardware

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

• Panic exit hardware

• Fire exit hardware

Important

On a fire-rated opening, the complete system must maintain its required listing, including:

• Door

• Frame

• Falcon exit device

• ACSI electrification

• Power supply

• Wiring

• Control equipment

Always follow applicable building, fire, and egress requirements.

Common Applications

Ideal for:

• Access-controlled entrances

• Automatic doors

• Schools

• Universities

• Hospitals

• Healthcare facilities

• Government facilities

• Office buildings

• Retail facilities

• Airports

• Institutional buildings

• Scheduled unlock systems

• Remote release applications

• High-traffic commercial entrances

Product Specifications

Brand: ACSI
Manufacturer: Architectural Control Systems, Inc.
Series: 1550K-MD
Model: 1550K-MDF
Product Type: Motorized Latch Retraction / Dogging Kit
Compatible Manufacturer: Falcon
Compatible Series: 24 / 25
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
Diagnostic LEDs: Yes
Wiring Leads: Non-Polarized
Field Installable: Yes
Factory Installable: Yes
36" Device Maximum Cutoff: 1-1/2"
48" Device Maximum Cutoff: 7-1/2"
Panic Hardware Listed: Yes
Fire Exit Hardware Listed: Yes
Exit Device Included: No

Compatible Exit Device Series

Falcon

• 24 Series

• 25 Series

What's Included

Typical kit includes:

• ACSI motorized latch-retraction assembly

• Falcon-specific motor bracket

• Connecting link

• Wiring leads

• Manual-dogging hole plug

• Mounting hardware

• Technical assistance labels

Exact kit contents may vary with manufacturing revisions.

Not Included

• Falcon exit device

• 24VDC power supply

• Power transfer

• Card reader

• Keypad

• Access-control panel

• Automatic door operator

• Control relay

• Field wiring

• Door

• Frame

• Installation labor

Important Ordering Information

Before ordering, verify:

• Exit device is a compatible Falcon 24 or 25 Series

• Exact device configuration

• Device length

• Amount the device has been shortened

• Existing manual dogging configuration

• Rim, mortise, SVR, or CVR application

• 24VDC power-supply capacity

• Wire distance and gauge

• Automatic operator requirements

• Panic or fire-exit application

Important

1550K-MDF = Falcon 24 / 25 Series

Do not substitute the 1550K-MDO, which is designed for Falcon 1690/1790 and First Choice 3600/3700 Series devices.