Chamberlain 248739 User Manual Page 1

The Chamberlain Group, Inc.845 Larch AvenueElmhurst, Illinois 60126-1196www.chamberlain.comGARAGE DOOR OPENERModel 248739For Residential Use Only Owne

10ASSEMBLY STEP 4Install the Belt and Attach the Belt Cap Retainer1. Pull the belt around the idler pulley and toward the trolley. The ribbed side m

11ASSEMBLY STEP 5Set the Tension• Insert a screwdriver tip into one of the nut ring slots and brace it fi rmly against the trolley.• Place a 7/16&q

12INSTALLATION STEP 1Determine the Header Bracket LocationInstallation procedures vary according to garage door types. Follow the instructions which a

13INSTALLATION STEP 2Install the Header BracketYou can attach the header bracket either to the wall above the garage door, or to the ceiling. Follow t

14INSTALLATION STEP 3Attach the Rail to the Header Bracket• Position the opener on the garage fl oor below the header bracket. Use packing material a

15ONE-PIECE DOOR WITHOUT TRACKA 2x4 on its side is convenient for setting an ideal door-to-rail distance. • Remove foam packaging.• Raise the opene

16INSTALLATION STEP 5Hang the OpenerThree representative installations are shown. Yours may be different. Hanging brackets should be angled (Figure 1)

17To prevent possible SERIOUS INJURY or DEATH from electrocution:• Be sure power is NOT connected BEFORE installing door control.• Connect ONLY to

18INSTALLATION STEP 7Install the Lights • Press the release tabs on both sides of lens. Gently rotate lens back and downward until the lens hinge is

19To prevent possible SERIOUS INJURY or DEATH from electrocution or fi re:• Be sure power is NOT connected to the opener, and disconnect power to cir

2TABLE OF CONTENTSWhen you see these Safety Symbols and Signal Words on the following pages, they will alert you to the possibility of serious injury

20INSTALLATION STEP 10Install The Protector System®The safety reversing sensor must be connected and aligned correctly before the garage door opener w

21INSTALLING THE BRACKETSBe sure power to the opener is disconnected. Install and align the brackets so the sensors will face each other across the ga

22MOUNTING AND WIRING THE SAFETYREVERSING SENSORSMounting:• Slide a 1/4"-20x1/2" carriage bolt head into the slot on each sensor. Use wing

23ALIGNING THE SAFETY REVERSING SENSORS• Plug in the opener. The indicator lights in both the sending and receiving eyes will glow steadily if wiri

24INSTALLATION STEP 11Fasten the Door Bracket Follow instructions which apply to your door type as illustrated below or on the following page.A horizo

25ONE-PIECE DOORS Please read and comply with the warnings and reinforcement instructions on the previous page. They apply to one-piece doors also.•

26INSTALLATION STEP 12Connect Door Arm to the TrolleyFollow instructions which apply to your door type as illustrated below and on the following page.

27Figure 5Figure 6Straight Door ArmCurved Door Arm(Groove facing out)Straight Door ArmCurved Door ArmCORRECT INCORRECTALL ONE-PIECE DOORS1. Assemble

28Without a properly installed safety reversal system, persons (particularly small children) could be SERIOUSLY INJURED or KILLED by a closing garage

29Without a properly installed safety reversal system, persons (particularly small children) could be SERIOUSLY INJURED or KILLED by a closing garage

3To prevent damage to garage door and opener:• ALWAYS disable locks BEFORE installing and operating the opener. • ONLY operate garage door opener

30Without a properly installed safety reversal system, persons (particularly small children) could be SERIOUSLY INJURED or KILLED by a closing garage

31IMPORTANT SAFETY INSTRUCTIONSOPERATION To reduce the risk of SEVERE INJURY or DEATH:WARNING 1. READ AND FOLLOW ALL WARNINGSAND INSTRUCTIONS.2. A

32Using Your Garage Door OpenerYour Security✚® opener and hand-held remote control have been factory-set to a matching code which changes with each us

33To Open the Door ManuallyDISCONNECT THE TROLLEY:The door should be fully closed if possible. Pull down on the emergency release handle (so that the

34The lithium battery should produce power for up to 5 years. To replace battery, use the visor clip or screwdriver blade to pry open the case as show

356. My motor unit hums briefl y: • First verify that the trolley is against the stop bolt. • Release the door from the opener by pulling the Eme

36Diagnostic ChartSafety reversing sensors slightly misaligned (dim or fl ashing LED).Door control or wire shorted. Safety reversing sensors wire short

37PROGRAMMINGNOTICE: If this Security✚® garage door opener is operated with a non-rolling code remote control, the technical measure in the receiver o

38To Add, Reprogram or Change a Keyless Entry PINNOTE: Your new Keyless Entry must be programmed to operate your garage door opener.USING THE “LEARN”

39REPAIR PARTSRail Assembly PartsKEY PART NO. NO. DESCRIPTION1 4A1008 Master link kit2 41C5141-2 Complete trolley assembly3 41A5665-2 Complete

4PlanningIdentify the type and height of your garage door. Survey your garage area to see if any of the conditions below apply to your installation. A

40KEY PART NO. NO. DESCRIPTION1 41A4371 Belt cap retainer2 41A4885-5 Gear and sprocket assembly. Complete with: Spring washer, thrust washer, re

41ACCESSORIES 8808CB760CBOutside Quick Release:Required for a garage with NO access door.8 Foot (2.4 m) Rail Extension:To allow an 8 foot (2.4 m) door

42NOTES

43NOTES

CHAMBERLAIN® SERVICE IS ON CALLOUR LARGE SERVICE ORGANIZATIONSPANS AMERICAINSTALLATION AND SERVICE INFORMATION IS AS NEAR AS YOUR TELEPHONE. SIMPLY DI

5Planning (Continued)ONE-PIECE DOOR INSTALLATIONS• Generally, a one-piece door does not require reinforcement. If your door is lightweight, refer to

6Your garage door opener is packaged in one carton which contains the motor unit and all parts illustrated below. Accessories will depend on the model

7Hardware InventorySeparate all hardware and group as shown below for the assembly and installation procedures.ASSEMBLY HARDWAREBolt 1/4"-20x1-3/

8ASSEMBLY STEP 1Assemble the Rail and Install the TrolleyTo avoid installation diffi culties, do not run the garage door opener until instructed to do

9ASSEMBLY STEP 2Fasten the Rail to the Motor Unit• Insert a 1/4"-20x1-3/4" bolt into the cover protection bolt hole on the back end of th