HEAVY INDUSTRIAL-DUTY DOOR OPERATOR-MODEL GH

STANDARD FEATURES
MODEL SPECIFIC:
Work included ­ The electric operator will be Lift-Master Model GH as manufactured by The Chamberlain Group, Inc. Related work ­ Door preparation, miscellaneous or structural metal work, field electrical wiring, wire, conduit, fuses and disconnect switches are in the scope of work of other divisions or trades.

Product:
Supply Model GH, heavy industrial-duty, cUL listed, gearhead hoist type operator(s) rated ___H.P., ___Volts, ___ Phase.

General:
Provide cUL listed electric door operator assembly of size and capacity recommended by door manufacturer; complete with electric motor and factory-prewired motor controls, worm-gear reduction unit, solenoid operated brake, 3-button open/close/stop control station, conduit and wiring from control to motor and accessories required for proper operation.

Electric Motor:
Motor shall be high starting torque, continuous-duty, industrial type, protected against overload by a current sensing or thermal overload device.

Motor Starter, Controls, Enclosures:
Option #1: For 115V (1/2 through 1 H.P.), 208-240V (1/2 through 2 H.P.), 460V (1/2 through 1-1/2 H.P.): Motor Control, Control Stations, Enclosures: Motor control shall be cUL approved microprocessor solid state type, and include a maximum run timer for motor protection. Motor control device shall be enclosed in a NEMA 1 enclosure and integral with the operator. Control enclosures shall conform to ANSI/NEMA ICS6. Open/close/stop station shall be NEMA type 1, and shall incorporate a maintenance alert indicator to signal intervals for routine door and operator maintenance.

Special Note To Architect:
For cUL approved Self-Monitoring Safety Operation in 115V and 208-240V single or three phase applications, select Option #1 and add "Must include a CPS II(TM) Self-Monitoring Sensor to detect obstructions in the doorway."

Option #2: For 115V, 208-240V, 460V or
575V operation: Motor Starter, Controls, Enclosures: Motor starter shall be an across-the-line, mechanically interlocked, magnetic reversing contactor. Motor starting device shall be enclosed in a NEMA 1 enclosure and integral with the operator. Control enclosures shall conform to ANSI/NEMA ICS6. A NEMA type 1 open/close/stop control station shall be provided as standard equipment.

Frame and Reduction:
Speed reduction shall be wormgear-in-oil-bath gear reducer with synthetic "All Climate" oil. Shall provide a 45:1 speed reduction. Door drive shall utilize #50 roller chain and sprockets; #80 roller chain and sprockets on 3 H.P. Operator shall be equipped with an electrically interlocked floor level disconnect and chain hoist for manual operation and an electric solenoid-actuated brake to stop the motor and hold the door in position. Operator shall be capable of driving the door at a speed of approximately 8 to 9 inches per second (20 to 23 cm/sec).

Limit Switches:
Fully adjustable, driven linear type limit switch mechanism shall synchronize the operator with the door. Low friction nylon limit nuts fitted on threaded steel shaft, rotating on oilite self-lubricating bronze bushings. The motor shall be removable without affecting the limit switch settings.

Execution:
Install the motor operator in accordance with Lift-Master instructions and standards and in compliance with applicable federal, state or local regulations.

Warranty:
Lift-Master Commercial Door Operators and accessories shall be warranted to be free of any defect in materials and workmanship for a period of two years.