Install The Battery Backup (Optional); Install The Lights - Chamberlain LiftMaster Professional Security+ 3850 Owner's Manual

INSTALLATION STEP 7

Install the Battery Backup (Optional)

• Make sure motor unit is unplugged.
• Using a Phillips head screwdriver, remove the battery
cover on the motor unit.
• Partially insert battery into motor unit with terminals
facing out.
• Connect red (+) and black (-) wires from motor unit to
corresponding terminals on battery.
• Replace battery cover.
INSTALLATION STEP 8

Install the Lights

• Press the release tabs on both sides of lens. Gently
rotate lens back and downward until the lens hinge is
in the fully open position. Do not remove the lens.
• Install up to a 100 watt maximum light bulb in each
socket. The lights will turn ON and remain lit for
approximately 4-1/2 minutes when power is connected.
Then the lights will turn OFF.
• Reverse the procedure to close the lens.
• If the bulbs burn out prematurely due to vibration,
replace with a Garage Door Opener bulb.
NOTE: Use only standard light bulbs. The use of short
neck or speciality light bulbs may overheat the endpanel
or light socket.
WARNING
CAUTION
To prevent possible OVERHEATING of the end panel or
light socket:
• DO NOT use short neck or specialty light bulbs.
• DO NOT use halogen bulbs. Use ONLY incandescent.
Release Tab
100 Watt (Max)
Standard Light Bulb
14
Battery Cover
Battery
100 Watt (Max)
Standard Light Bulb
Lens
Hinge