Bi-Fold doors shall be provided with power operators to open and close the door. The Motor/Gear Reducer unit shall be equipped with an electric brake to stop and hold the door in any position of door travel. Electrical controls shall conform to National Electrical code Section 513. Control enclosures shall conform to NEMA 4. . Each control station shall be a two button type with buttons marked "Open" and "Close". The "Open" and "Close" buttons shall be of the constant pressure type. When the door is in motion and pressure is released from the control button, the door shall stop instantly and remain in the stopped position. From the stopped position, the door shall be operable in either direction by the "Open" or "Close" control button. The control station shall be located near the same end of the door as the electrical supply connection. A three button control is utilized where automatic operation is specified. The three button control features a "Stop" button which, when depressed, will stop the door at any position. As with the two button control, the door will be operable in either direction by the "Open" or "Close" control button. All control stations utilize a keyed lock-out to aid in the prevention of unauthorized personnel operating the system.
Drive motor (or motors) shall be heavy duty 2 HP or larger TEFC type. Standard voltage is 230V, single phase with 208 or 230/460 volt three phase voltages optional. Electric brake shall have a manual release feature. The gear reducer shall be heavy duty with oil bath lubrication. Gear reducer is supplied with synthetic lubricant for maximum efficiency.