Craftsman 139.18054 Owner's Manual

Safety Reversing SensorHorizontal and vertical reinforcementis needed for lightweight garage doors(fiberglass, steel, aluminum, doorwith glass panels, etc.).See page 24 for details.FINISHED CEILINGSupport bracket &fastening hardwareis required.See page 17.DoorCenterGap between floor andbottom of door must notexceed 1/4" (6 mm)Header WallAccess DoorExtensionSpringTorsionSpringOR— — — — — — — —SafetyReversingSensor4SECTIONAL DOOR INSTALLATIONPlanningIdentify the type and height of your garage door.Survey your garage area to see if any of theconditions below apply to your installation. Additionalmaterials may be required. You may find it helpful torefer back to this page and the accompanyingillustrations as you proceed with the installation ofyour opener.Depending on your requirements, there are severalinstallation steps which may call for materials orhardware not included in the carton.• Installation Step 1 – Look at the wall or ceilingabove the garage door. The header bracket mustbe securely fastened to structural supports.• Installation Step 5 – Do you have a finished ceilingin your garage? If so, a support bracket andadditional fastening hardware may be required.• Installation Step 10 – Depending upon garageconstruction, extension brackets or wood blocksmay be needed to install sensors.• Installation Step 10 – Alternate floor mounting ofthe safety reversing sensor will require hardwarenot provided.• Do you have an access door in addition to thegarage door? If not, Model 18752 Emergency KeyRelease is required. See Accessories page.• Look at the garage door where it meets the floor.Any gap between the floor and the bottom of thedoor must not exceed 1/4" (6 mm). Otherwise, thesafety reversal system may not work properly. SeeAdjustment Step 3. Floor or door should berepaired.SECTIONAL DOOR INSTALLATIONS• Do you have a steel, aluminum, fiberglass or glasspanel door? If so, horizontal and vertical reinforce-ment is required (Installation Step 11).• The opener should be installed above the center ofthe door. If there is a torsion spring or centerbearing plate in the way of the header bracket, itmay be installed within 4feet (1.22 m) to the left orright of the door center. See Installation Steps 1and 11.• If your door is more than 7 feet (2.13 m) high, seerail extension kits listed on Accessories page.TrolleyHeaderWallGarageDoorHeaderBracketStraightDoorArmEmergencyReleaseRope & HandleDoorBracketCurvedDoorArmGarageDoorSpring ChainTrolleyStop BoltCLOSED POSITION