Chamberlain LiftMaster PROFESSIONAL SECURITY+ 3800C Mode D'emploi page 13

INSTALLATION STEP 8
Mount the Battery Backup Unit (BBU)
(not provided)
If the optional 475LMC battery backup unit is part of this
installation it should be installed at this time.
• The BBU can be mounted to either the ceiling or a wall
within 3' (.9 m) of the motor unit.
• Position the BBU as desired to a structural support
(ceiling joist or wall stud).
• Attach the BBU to the support using the mounting holes
on either side of the BBU.
• Secure the BBU using the 1-1/2" lag screws (2) provided
with the BBU unit.
• Connect the BBU cord into the connector on the bottom
of the motor unit.
• Follow all instructions included with the 475LMC unit to
test for proper operation and testing of the BBU.
All manuals and user guides at all-guides.com
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BBU Cord
475LMC Battery
Backup Unit
Connector