LiftMaster T T MECHANICAL Manual - Page 8

CONTROL WIRING DETERMINE WIRING TYPE Refer to the wiring diagram located on the inside cover the electrical box to determine the type of control wiring. Standard C2 or B2 Wiring Standard operators are shipped from the factory with jumper set for C2 wiring, which requires constant pressure on button to close the door. If momentary contact on close direction is desired (B2 wiring) you must include an entrapment protection device. See close control jumper setting below. Constant pressure on close (C2 wiring) Red jumper wire was placed on terminal #2 in electrical enclosure. The operator will require constant pressure on close control in order to keep door moving in the close direction. Momentary contact on close (B2 wiring) Move red jumper wire from terminal #2 to terminal #3. The operator will require only momentary contact to close the door. SPECIAL CONTROL WIRING DATA This Operator has Control Wiring. SUPPLEMENTAL WIRING DIAGRAM(S) REPLACEMENT WIRING DIAGRAM Note: Supplemental Wiring Diagrams are to be used in addition to 1742-1. Replacement Wiring Diagram is to be used in place of 1742-1. WIRING DI Wiring Type SPECIAL CONTROL WIRING If your operator was shipped from the factory with non-standard control wiring or with optional accessories that require addition instructions, refer to the wiring diagram(s) indicated in the special control wiring data box. When a replacement wiring diagram is present, wiring diagrams in this manual will not apply. Refer only to the replacement wiring diagram for all connections. Wiring Diagram label on inside cover of electrical box IMPORTANT NOTE: If your wiring diagram is missing, or you are unsure of the wiring type for your operator, contact the customer service department @ 1-800-528-2806. LOCATING THE CONTROL STATION All operators are supplied with some type of control station. Generally a three button station (OPEN/CLOSE/STOP) is provided. A two-position key switch or control station (OPEN/CLOSE) may be added or substituted when requested at the time of order. Mount the control station near the door. WARNING INSTALL THE CONTROL STATION WHERE THE DOOR IS VISIBLE, BUT AWAY FROM THE DOOR AND ITS HARDWARE. IF CONTROL STATION CANNOT BE INSTALLED WHERE DOOR IS VISIBLE, OR IF ANY DEVICE OTHER THAN THE CONTROL STATION IS USED TO ACTIVATE THE DOOR, A REVERSING EDGE MUST BE INSTALLED ON THE BOTTOM OF THE DOOR. FAILURE TO INSTALL A REVERSING EDGE UNDER THESE CIRCUMSTANCES MAY RESULT IN SERIOUS INJURY OR DEATH TO PERSONS TRAPPED BENEATH THE DOOR. MOUNT WARNING NOTICE IMPORTANT: Mount WARNING NOTICE beside or below the push button station. Standard Control Station Push Buttons OPEN CLOSE STOP WARNING TO PREVENT ENTRAPMENT DO NOT START DOOR DOWNWARD UNLESS DOORWAY IS CLEAR WARNING Notice 8