LiftMaster T T MECHANICAL Manual - Page 2

SPECIFICATIONS MOTOR TYPE Continuous duty HORSEPOWER 1/3, 1/2, 3/4 & 1 Hp Single or Three phase SPEED 1725 RPM VOLTAGE 115, 220, 230 Single phase 230, 460, 575 Three phase CURRENT See motor nameplate ELECTRICAL TRANSFORMER 24VAC CONTROL STATION: ......NEMA 1 three button station. OPEN/CLOSE/STOP WIRING TYPE C2 (Factory Shipped) Momentary contact to OPEN & STOP, constant pressure to CLOSE, open override plus wiring for sensing device to reverse. See page 8 for optional control settings. LIMIT ADJUST Linear driven, fully adjustable screw type cams. Adjustable to 24 feet. MECHANICAL SAFETY DRIVE REDUCTION Primary: Heavy duty (5L) V-Belt. Secondary: #41 chain/sprocket. Output: #48 chain (1/3 &1/2Hp) or #41 chain (3/4 &1Hp) OUTPUT SHAFT SPEED: .....140 R.P.M. DISCONNECT Quick disconnect door arm for emergency manual door operation. REVERSING EDGE:.....(Optional) Electric or pneumatic sensing device attached to the bottom edge of door. DOOR SPEED 11" - 12" per sec. depending on door BRAKE Solenoid actuated disc brake on 3/4 & 1Hp BEARINGS Output Shaft: Shielded Ball Bearing. Clutch Shaft: IronCopper sintered and oil impregnated. A REVERSING EDGE IS STRONGLY RECOMMENDED FOR ALL COMMERCIAL OPERATOR INSTALLATIONS. REQUIRED WHEN THE 3 BUTTON CONTROL STATION IS OUT OF SIGHT OF DOOR OR ANY OTHER CONTROL (AUTOMATIC OR MANUAL) IS USED. WEIGHTS AND DIMENSIONS HANGING WEIGHT: .........80-110 LBS. 13-1/8" * Door Height Plus 4 feet (minimum) 4" HIGHEST POINT OF DOOR TRAVEL 10-1/2" *20-1/2" * - For Units with Brake add 3-1/2" (Standard on 3/4 & 1Hp models Optional on 1/3 & 1/2Hp) 2