Motor: Resilient mount continuous-duty, high-starting torque motor with instant reverse and overload protection. Available in 1/2 H.P. (373W); single phase capacitor start motors. Removable without affecting limit switch settings.

Wiring Type: All lift master garage door openers are factory preset to C2 wiring providing momentary contact to open and stop, with constant contact to close. Momentary contact to close (B2 wiring) can be easily set. The operator is pre-wired to accept a sensing device, photoelectric control, radio controls and most types of access control equipment.

Maintenance Alert System: This important feature provides an accurate method for tracking door use and establishing safe and effective maintenance programs for the door and operator. The Maintenance Alert System features an internal programmable cycle timer that actually counts each time the door cycles. This system is easily preset by the installer for the particular door and application. Once the preset number is reached, an indicator light on the 3-button station flashes to signal that it is time for routine door and operator maintenance.

Programmable Mid-Stop: A standard feature on the Logic Control Board (L).

Maximum Run Timer: Protects against damage to the door and lift master garage door opener .

Auxiliary Reversal System: If a closing door strikes an obstruction, the system will detect the slip of the clutch and reverse the door to the full open position. This system is not a substitute for a safety sensing device such as a photo cell or reversing edge.

Delay-on-Reverse Circuit: A standard feature on the Logic Control Board (L).

Low Profile Design: Low profile design can be ceiling mounted for low headroom applications.

Quiet Operation: A quality resilient mount motor, nylon inserts on trolley assembly and nylon quiet gliding chain guides on rail spacers provide quiet, lift master garage door opener smooth operation.

Rail Assembly: High strength dual L-rail track and quick-mount header bracket which provides fast, swing-up installation.

Control Circuit: 5VDC NEC class 2.

Drive Reduction: First stage heavy-duty 4L V-belt; second and third stages #41 chain; output on trolley #48 chain.

Auto-Reconnect Trolley Assembly: Spring-loaded trolley features nylon inserts for quiet operation and auto-reconnect feature eliminating the need to manually reattach the door arm to the trolley after emergency disconnect.

Pushbutton Station: 3-buttons station for OPEN/CLOSE/STOP functions is standard for all operators. Controls with one, two and three buttons are available.

Construction: NEMA 1 type electrical box, heavy-duty 11-gauge painted steel frame, all reduction sprockets drilled and pinned to shafts.

Bearings: Industrial ball bearings on the output shaft; heavy-duty, oil filled on reduction shafts.

External Radio Control Terminal: External terminals provide quick, convenient connections for universal radio controls.

Friction Clutch: Adjustable friction clutch helps protect against damage to the door and operator should the door meet an obstruction.

Control Accessories and Options:

Sensing Edge: (Recommended) Designed to sense an obstruction and signal door operator to stop or reverse as desired. Either an electric or pneumatic sensing device can be added to bottom edge of door.

Radio Control: Portable transmitter signals operator to open and/or close door.

Treadle: Signals door operator to open and/or close when vehicle depresses treadle.

Available Plug-In Option Boards for the Solid State Logic Control Board (L):

Commercial Protector System^TM II: (Recommended) Features our powerful photo sensors to provide a UL approved self-monitoring operator for commercial door applications. 4-wire or 2-wire "fail-safe" edges may be used. Board also contains a Timer-to-Close function.

Timer-to-Close Option: Part of the CPS II board. It provides the ability to close the door at a programmable time from 5 seconds up to 1 hour. Combined with the CPS II board for the convenience of a timer and the safety necessary to protect an auto closing lift master garage door opener .

Auxiliary Contact Board Option: Features both normally-open and normally-closed contacts that actuate when unit is powered down. Can be used to signal security systems, operate heaters, warning devices or other ancillary devices (5V to 240V).

Warning Signal Option Board: Provides apartment warn