Combine motorized latch retraction and electrically controlled fail-secure locking in one commercial mortise lock with the ACSI M1520MLR L9070B.

Built around the Schlage L9070B mortise lock platform, the M1520MLR provides two electronically controlled functions:

• Motorized latch retraction

• Fail-secure electric locking / unlocking

This allows the lock to be integrated with access-control systems and automatic door operators while maintaining a secure condition when electrical power is removed.

The M1520MLR is designed for 24VDC operation and is ideal for commercial openings requiring remote unlocking, automatic-door sequencing, and positive mechanical latching.

Key Features

• Genuine ACSI – Architectural Control Systems

• Model M1520MLR L9070B

• ACSI Series 1500 Electric Mortise Lock

• Based on Schlage L9070B

• Motor-controlled design

• Motorized latch retraction

• Fail-secure electric locking

• Remote lock / unlock capability

• 24VDC operation

• Designed for access-control integration

• Compatible with automatic-door operator applications

• Maintains mechanical latching when the door is closed

• Inside egress remains mechanically available in the applicable L9070B configuration

• Monitoring options available on separately specified configurations

• Commercial mortise-lock construction

• Suitable for high-use commercial and institutional openings

Dual Electrified Function

The M1520MLR provides more capability than a standard electrically controlled mortise lock.

It combines:

1. Motorized Latch Retraction

The latchbolt can be electrically retracted through the internal motor mechanism.

This allows the door to be opened without the automatic operator or user having to overcome the latch.

Motorized latch retraction is especially useful for:

• Automatic swing doors

• ADA entrances

• Access-controlled doors

• Remote release applications

• Scheduled unlocking

• Building automation systems

2. Fail-Secure Electric Locking

The 1520 designation identifies the lock as:

Fail Secure

In fail-secure operation:

Power Removed = Secure

The electrically controlled exterior access remains locked when power is lost.

This allows the opening to maintain security during a power interruption while normal mechanical egress is maintained from the egress side according to the lock function.

Schlage L9070B Platform

The M1520MLR is built around the:

Schlage L9070B Mortise Lock

ACSI modifies the commercial Schlage mortise-lock platform to provide both motorized latch retraction and electrically controlled locking.

This provides a robust solution for projects that specify Schlage L Series hardware but require advanced electrified operation.

Important

The complete lock function should be coordinated with the required:

• Lever trim

• Cylinder

• Rose or escutcheon

• Handing

• Finish

• Door preparation

• Access-control sequence

Motorized Latch Retraction

When the latch-retraction circuit is activated, the motor retracts the latchbolt electrically.

This allows a compatible opening to operate in a push/pull or automatic-door condition without mechanical resistance from the latch.

Once latch-retraction power is removed, the latch returns to normal mechanical operation.

Typical Applications

Motorized latch retraction is useful with:

• Automatic door operators

• Card-reader systems

• Keypads

• Remote release switches

• Time schedules

• Building management systems

• ADA door-control systems

Automatic Door Operator Integration

The M1520MLR is particularly useful with an automatic swing-door operator.

A typical sequence may be:

1. User presents an authorized credential

2. Access-control system sends an unlock command

3. M1520MLR retracts the latch

4. Automatic door operator activates

5. Door opens without fighting the latch

6. Door completes its operating cycle

7. Latch returns to normal operation

8. Lock returns to its secured condition as programmed

Proper sequencing is required between the lock and automatic operator.

Fail-Secure Operation

The M1520MLR is specifically the:

Latch Retraction / Fail Secure

version of the ACSI system.

Fail secure means that loss of electrical power does not automatically unlock the secure side of the opening.

This is commonly used on:

• Secure office entrances

• Restricted rooms

• Server rooms

• Storage areas

• Controlled institutional openings

• Government facilities

Important

Fail-secure operation must still provide code-compliant egress from the occupied side of the door.

Always coordinate the final system with applicable building, fire, and life-safety requirements.

24VDC Operation

ACSI's current specification for the:

M1520MLR L9070B

is:

24VDC

A properly regulated power supply should be selected based on the complete electrical load of the lock, access-control components, automatic operator, and other connected devices.

Important Voltage Note

Some distributor information may reference 12/24VAC/DC for this model.

However, ACSI's current manufacturer price book lists the exact M1520MLR L9070B as 24VDC.

For new installations, use the current ACSI specification unless the actual product label or project documentation states otherwise.

Access-Control Integration

The M1520MLR can be integrated with compatible:

• Card readers

• Keypads

• Access-control panels

• Mobile credential systems

• Remote release switches

• Timers

• Building management systems

• Automatic door operators

• Security systems

A properly rated interface relay may be required depending on the access-control system.

Mechanical Egress

The electrified locking function controls entry from the secure side while the mortise-lock platform maintains normal mechanical egress according to the L9070B function.

Electrical access control must never interfere with required code-compliant egress.

Mechanical Key Operation

When equipped with the proper Schlage-compatible cylinder and trim, the lock can provide mechanical key operation according to the underlying L9070B function.

The cylinder, core, and keys are typically ordered separately unless specifically included in the configured lockset.

Monitoring Options

ACSI offers multiple monitoring options for Series 1500 electric mortise locks.

Depending on the configured model, available functions may include:

• LM – Latch Monitor

• DPS – Door Position Switch

• LMR – Latch Monitor

• RX / Authorized Egress

• Other access-control monitoring configurations

Important

Monitoring functions are not assumed to be included with the base M1520MLR L9070B unless the corresponding monitoring suffix is specifically ordered.

Life-Safety Integration

The Series 1500 platform can be incorporated into properly designed life-safety and access-control systems.

The complete opening should be coordinated with:

• Building code

• Fire code

• Egress requirements

• Fire alarm interface

• Automatic door operator

• Access-control logic

• Authority Having Jurisdiction requirements

Commercial Mortise Lock Construction

The L9070B platform provides heavy-duty mortise-lock construction for demanding commercial applications.

Typical applications include:

• Hospitals

• Healthcare facilities

• Schools

• Universities

• Government buildings

• Office buildings

• Airports

• Institutional buildings

• Secure commercial areas

• Automatic door openings

Common Applications

Ideal for:

• Automatic door entrances

• ADA accessible openings

• Access-controlled doors

• Secure offices

• Server rooms

• Government facilities

• Healthcare facilities

• Educational buildings

• Remote-release openings

• Scheduled unlock systems

• High-traffic commercial entrances

Product Specifications

Brand: ACSI
Manufacturer: Architectural Control Systems, Inc.
Series: Series 1500 Electric Locks
Model: M1520MLR L9070B
Lock Type: Electric Mortise Lock
Base Lock: Schlage L9070B
Control Type: Motor-Controlled
Primary Function: Motorized Latch Retraction + Electric Locking
Electrical Locking Function: Fail Secure
Latch Retraction: Yes
Remote Lock / Unlock: Yes
Operating Voltage: 24VDC
Automatic Door Compatible: Yes
Access-Control Compatible: Yes
Mechanical Latching: Yes
Monitoring: Optional – Must Be Specified
Lever Trim Included: Verify Configuration
Cylinder Included: Verify Configuration

What's Included

The supplied M1520MLR L9070B configuration typically consists of:

• Schlage L9070B mortise lock body

• ACSI motorized latch-retraction modification

• ACSI fail-secure electric locking modification

• Electrical leads / connectors associated with the factory modification

• Internal mortise-lock components

Exact packaging and trim configuration should be confirmed at time of order.

Not Included Unless Specifically Ordered

Depending on the supplied configuration:

• Decorative lever trim

• Rose

• Escutcheon

• Mortise cylinder

• Interchangeable core

• Keys

• Monitoring options

• Power supply

• Electric hinge or power transfer

• Card reader

• Keypad

• Access-control panel

• Automatic door operator

• Door

• Frame

• Installation labor

Important Ordering Information

Before ordering, verify:

• Model M1520MLR L9070B

• Schlage L9070B function required

• Fail-secure operation required

• 24VDC power available

• Latch-retraction requirement

• Automatic door operator interface

• Door handing

• Door thickness

• Trim style

• Rose or escutcheon

• Cylinder / core format

• Finish

• Monitoring options

• Power-transfer method

• Fire-rating requirements

• Access-control sequence