User manual LIFT-MASTER 1280-298LMC

[. . . ] TM ® Garage Door Opener Model 1280-298LMC - 1/2 HP For Residential Use Only Owner's Manual s s s s s Please read this manual and the enclosed safety materials carefully!Fasten the manual near the garage door after installation. The door WILL NOT CLOSE unless the Protector System® is connected and properly aligned. Periodic checks of the opener are required to ensure safe operation. [. . . ] If the door still won't close completely and the trolley bumps into the pulley bracket (see page 4), try lengthening the door arm (see page 22). If you have adjusted the door arm to the maximum length and the door still will not close completely, lower the header bracket. · If the opener reverses in fully closed position: Decrease down travel. Turn the DOWN limit adjustment screw clockwise. · If the door reverses when closing and there is no visible interference to travel cycle: If the opener lights are flashing, the Safety Reversing Sensors are either not installed, misaligned, or obstructed. Test the door for binding: Pull the manual release handle. If the door is binding, call for garage door service. If the door is not binding or unbalanced, adjust the DOWN (close) force. 24 Adjustment Step 2 Adjust the Force WARNING Too much force on the door will interfere with the proper operation of the safety reverse system. The door might not reverse properly when required and could seriously injure or kill someone under it. Do not increase the force beyond the minimum amount required to close the door. Do not use the force adjustments to compensate for a binding or sticking garage door. Test the safety reverse system following all adjustments to force levels. See page 26. Force Adjustment Controls Force adjustment controls are located on the right side panel of the opener. Force adjustment settings regulate the amount of power required to open and close the door. The door will stop in the up direction if anything interferes with its travel. The door will reverse in the down direction if anything interferes with its travel (including binding or unbalanced doors). If the forces are set too light, door travel may be interrupted by nuisance reversals in the down direction and stops in the up direction. Weather conditions can affect the door movement, so occasional adjustment may be needed. The maximum force adjustment range is 260 degrees, about 3/4 of a complete turn. Do not force controls beyond that point. Turn force adjustment controls with a screwdriver. 1 2 3 9 7 5 3 1 9 7 5 3 1 KG KG 9 7 5 3 1 9 7 5 3 1 KG KG Adjustment Label Right Side Panel of Opener How and When to Adjust the Forces Test the DOWN (close) force Grasp the door bottom when the door is about halfway through DOWN (close) travel. [. . . ] - Saturday For professional installation, parts and service, contact your local LIFT-MASTER/ CHAMBERLAIN dealer. Look for him in the Yellow Pages, or call our Service number for a list of dealers in your area. 1-800-654-4736 LIFT-MASTER GARAGE DOOR OPENER FIVE-YEAR LIMITED WARRANTY The Chamberlain Group, Inc. ("Seller") warrants to the first retail purchaser of this product, for the residence in which this product is originally installed, that it will be free from any defect in materials and/or workmanship for a period of five years from the date of purchase. Additionally, the motor and belt are warranted for the lifetime of the product. [. . . ]