Chamberlain 248739 garage door opener

User Manual - Page 16

For 248739.

PDF File Manual, 44 pages, Download pdf file

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INSTALLATION sTEP'"'"5'"'''""''""'"""''
Hangthe Opener
Threerepresentative installations are shown. Yours may
be different. Hanging brackets should be angled
(Figure 1) to provide rigid support. Onfinished ceilings
(Figures2 and3), attacha sturdy metal bracket to
structural supports before installing the opener.This
bracket andfastening hardware are not provided.
1. Measure thedistance from each side of the motor unit
to the structural support.
2. Cut both piecesof the hanging bracket to required
lengths,
3. Drill 3/16" pilot holes in thestructural supports.
4. Attach one endof eachbracket to a support with
5/16"-18xl-7/8" lag screws.
5. Fastenthe openerto the hanging brackets with
5/t6"-18x7/8" hex bolts, lock washers and nuts.
6. Checkto makesure the ra[Iis centeredover the door
(or in linewith theheaderbracket ifthe bracket is not
centered above the door),
7. Remove the 2x4. Operatethe door manually. Ifthe door
hits the rail, raise the headerbracket.
NOTE: DONOTconnect po,_/erto opener at this time.
HARDWARE SHOWN ACTUAL SIZE
LagScrew5/16"d8xlqi8 °
...........D
HexBolt
5/16"-t8x7/8" LockWasher5/I6" Nut 5/16"-18
To avoid possibfe SERIOUSINJURY from afailing
garagedoor opener, fasten it SECURELYto structural
supports of the garage.Concreteanchors MUST be
used if installing ANY brackets into masonry.
Figure t Structural
)OFIS
Screws
5/t 6'-18xl 4/8"
Lock Washer 5/16"
Nut 5/t6°4 8
Figure 2
Bracket
(NotProvided)
Hidden
Support
FINISHEDCEILING
LagScrews
5116"-I8xl q/8 °
Bolt 5/16"q 8x7/8"
Lock Washer 5/t6"
Nut 5/16"-18
[NotProvided)
Bolt 5/16"-t8x7t8"
Lock Washer 5/I6"
Nut 5/t6q 8
Figure 3
Lag Screws
5/16"-t8xl -718"
16
Bolt 5/16"4 Bx7i8"
Lock Washer 5/16"
Nut 5it6"q8
(NotProvided)
Bolt5116"q8x7/8"
LockWasher5/16"
Nut5/16"q8
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