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The model LiftMaster APT is a low-profile apartment house door opener, as manufactured by The Chamberlain Group, Inc. and is for use on standard lift sectional doors. It is rated for more than 100 cycles per day.



  • Trolley type door opener
  • Voltage/phase: 115/230 V 1 phase
  • Horsepower: ½ HP
  • Motor
    Continuous-duty high-starting torque motor with instant reverse and overload protection. Available in 1/2 HP; single-phase capacitor start motors. Removable without affecting limit switch settings.
  • Auto-reconnect trolley assembly
    Automatic reconnect trolley assembly with nylon inserts in case of manual operation.
  • Quiet operation
    Quality resilient-mount motor, nylon inserts on trolley assembly and nylon quiet-gliding chain guides on rail spacers provide quiet, smooth operation.
  • Low-profile design
    Low-profile design can be ceiling-mounted for low headroom applications.
  • Wiring type
    All operators are factory preset to C2 wiring, providing momentary contact to open and stop, with constant contact to close. Monitored entrapment protection, using approved photo sensors CPS-U are standard. All other wiring types, B2, T, TS, and FSTS, can be selected with the selection of a switch. LiftMaster CPS-UN4 and CPS-RPEN4 photosensors or a monitored 4-wire sensing edge (via a CPS-EI Edge Interface Card) are optional. Logic 4.0 door openers can only accept UL-approved LiftMaster CPS-U, CPS-UN4, CPS-RPEN4 or CPS-EI monitored entrapment protection devices.
  • Control circuit
    5V DC NEC Class 2.
  • Brake
    Heavy-duty solenoid-actuated brake.
  • Drive reduction
    First-stage heavy-duty 4L V-belt; second and third stages #41 chain; output on trolley #48 chain.
  • Bearings
    Industrial ball bearings on output shaft; heavy-duty, oil-filled on reduction shafts.
  • Friction clutch
    Adjustable friction clutch helps protect against major damage to door and opener should the door meet an obstruction.
  • Rail assembly
    High-strength dual L-rail track and quick-mount header bracket which provides fast, swing-up installation.
  • Construction
    NEMA 1 type electrical box, heavy-duty 11-gauge steel frame with durable powder coat finish, all reduction sprockets drilled and pinned to shafts.
  • Delay-on-reverse circuit
    1.5-second delay-on-reverse circuit to prevent premature door and opener wear.
  • Timer-to-close
    Automatically closes the door – programmable in 1-second or 15-second increments.
  • Mid-Stop
    Stops the door at programmable mid-stop during open travel.
  • Maximum run timer
    Signals the door to reverse or stop if the closing time exceeds maximum by more than 10 seconds.
  • Maintenance alert system (5 000 to 10 000 cycles).
  • UL and CSA listed.
  • 2-year warranty.
  • Additional headroom required: 4″



CPS® Commercial Protector System®

The presence of primary entrapment protection is standard CPS-U for all modes. Primary entrapment protection devices are monitored continuously to ensure safe operation of the door and limit door opener functionality should an obstruction be detected or in the event of device failure. Optional LiftMaster Monitored Entrapment Protection devices, CPS-UN4, CPS-RPEN4, and CPS-EI, are designed to work in conjunction with LiftMaster commercial door openers to provide enhanced door safety and a broad range of modes and features to end users. Either monitored photo-sensor or monitored 4-wire sensing edge (in conjunction with the CPS-EI Edge Interface) protection may be selected, but one must be detected by the LiftMaster Logic 4.0 or Medium-Duty Logic circuit board in order to unlock full functionality.


Garage doors and garage door openers can be dangerous if not installed and verified by a professional and not used properly. Children must be supervised by an adult when they are inside or in the proximity of the garage.



  • LiftMaster APT door opener apt operator
  • 3-Button control station with LED
  • Radio receiver & external radio control terminal
  • Chain pack (according to door height)
  • Installation hardware
  • Rail according to door height



LiftMaster Internet Gateway™ (828LM)

This revolutionary new accessory features built-in MyQ™ technology that connects to the Internet and allows you to monitor and operate your garage door opener, or turn on or off lights in or around your home, from anywhere in the world by using your smartphone or computer. It utilizes a two-way communication system that puts freedom and control in your hands.

828lm internet gateway

828LM LiftMaster Internet Gateway

Mushroom Button Control Station

  Mushroom Button Control Station

Red/Green Traffic light

Indicates a gate or door position. Provides assurance of safe entering and exiting the facility, reducing the potential for costly accidents.

red_green light RGL24LY

Red / Green Traffic Light RGL24LY

3-Button Remote Control (813LM)

  • Encrypted DIP style three-button remote control
  • Features Security+ 2.0® technology
  • Ideal for applications such as gated communities or commercial applications requiring a large number of remotes for a common entrance
  • Dual 12-position DIP programming offers up to 4,096 codes
  • May also be programmed for Open/Close/Stop functionality
  • Narrowband transmission on 3 simultaneous frequencies (310, 315, 390 MHz)
  • Compatible only with Security+ 2.0® commercial receivers and operators

3-botton remote control

813LM 3-Button Remote Control

3-Buttons Premium Remote Control (895MAX)

Now it’s easy to find the right button on your remote control, even in the dark. The sleek design of the 3-Button Premium Remote Control from LiftMaster® includes bright blue LED buttons for easy night operation. Another convenience feature is its built-in MyQ™ enabled technology that allows you to control up to three LiftMaster® garage door openers or gate operators, or MyQ™ enabled light accessories. And for added security, it is equipped with Security+2.0™ rolling code technology that uses a new code at every click, making it virtually impossible for anyone to steal your remote control signal.

895 3 button remote

Liftmaster 895MAX 3-Button Multi Frequency Remote

3-Button Visor Remote Control (893MAX)

This powerful multi-door control can operate up to 3 garage door openers, gate operators, or MyQ® enabled light accessories. Plus, it’s compatible with all LiftMaster® garage door openers manufactured since 1993.

3 button remote

3-Button Mini Remote Control (893LM)

3-Button Mini Remote Control (890MAX)

If you’re always on the go, the LiftMaster® 3-Button Mini Remote Control will fit your busy lifestyle. It’s small enough to fit right on your keychain, or in your purse or pocket, so you’ll always have it when you come home. It can control up to three garage door openers or gate operators, or MyQ™ enabled light accessories. For added safety, it features Security+2.0™ rolling code technology that virtually eliminates interference and sends a brand new code every time it is used.

3 button 890 max

3-Button Mini Remote (890MAX)

Wireless Keyless Entry System (877MAX)

Open or close your garage door without using a remote control or key. The LiftMaster® Wireless Keyless Entry System can open the door using a private 4-digit code you program directly into the unit. You can also program it with temporary access codes for visitors or delivery and service personnel so they can gain access to your garage without having to give them your personal code. Plus, it works with all LiftMaster® garage door openers manufactured since January 1993.

keyless 877max

Wireless Keyless Entry System (877MAX)

Commercial Protector System® (CPS-UN4)

CPS-RPEN4 Retro-Reflective Photo Eye makes installs faster and simpler, by only having wiring on one side of door and Reflector on the other. A range of 50 feet in most cases. NEMA-4 rated.

retro-reflective photo eye

Liftmaster CPS-RPEN4 Monitored Retro-Reflective Photo Eye

Mushroom Button Control Station

Positioned where you want control of the system. Custom control panel sends the door to the full open position. Automatically enables the Timer-to-Close feature.

Note: California Residents: Proposition 65 WARNING

Mushroom Button Control Station 

Sensing Edge

If CPS-U / CPS-UN4 photosensors are present, a non-monitored 2-wire electric edge or pneumatic (air hose) edge may be used as ancillary protection devices.  

Vehicle detection system

(65-8302) Pneumatic Sensing Edge Kit with exterior air switch, 2-wire coil cord, and 14′ air hose.(65-5302) Pneumatic Sensing Edge Kit with exterior air switch, a 2-wire  take-up reel (20′ extended) and 14′ air hose.  

Antenna Extension Kit

The antenna extension kit can be used with EXT-ANT for maximum radio receiver range. 86LM (15′) 86LMT(25′)  

There are also other options and accessories available upon request.