Chamberlain CM475 User Manual

1. Mounting the BBU directly to the Ceiling within BBU’s
cord lenght

• After the motor unit has been installed, position the BBU next

to the motor unit to a structural support (joist) within BBU’s
cord length.

• Attach the BBU to the support by using the ceiling mount

holes on either side of the BBU.

• Secure the BBU to the ceiling using 1-1/2" lag screws

(provided).

2. Connect the BBU to the Motor Unit.

• Disconnect the motor unit from the electrical outlet.

• Connect the BBU cord into the connector on the bottom of

the motor unit.(see picture below) Connect the motor unit into
the electrical outlet. The BBU will activate and all LEDs will
turn on for 3 seconds.

• The green LED will begin flashing indicating the BBU is

charging from the motor unit.

IMPORTANT NOTE: Installation of BBU when permanent
electrical power is not available (such as new construction and
the electricity is not installed) may damage the batteries.
Unplug BBU after testing to prevent damage.

BATTERY BACKUP UNIT

Model CM475

OWNER’S MANUAL

To prevent possible SERIOUS INJURY or DEATH from
electrocution, disconnect ALL electric and battery power BEFORE
performing ANY service or maintenance.

WARNINGWARNING

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OPERATING INSTRUCTIONS

1. Test the installed BBU with the motor unit.

To test the BBU, disconnect the motor unit power cord from the
electrical outlet.

• A solid yellow LED indicates the BBU is operating on battery
power.

• A flashing yellow LED with beep indicates the BBU is
operating on battery power and that the battery charge is low.

• To test the BBU is functioning properly, open and close the
garage door.

• Re-connect the motor unit power cord back into the electrical
outlet.

• Verify that the green LED is flashing on the BBU (indicates
that the BBU is now charging).

• Test completed

2. Charge the battery.

• Allow the batteries 24 to 48 hours to fully charge before using
the BBU system.

A fully charged BBU supplies 24V DC to the motor unit for one
to two days of normal operation during an electrical power
outage. If the battery voltage drops too low, the batteries will
disconnect and the motor unit will no longer operate under
battery power.

After the electrical power has been restored, the batteries will
recharge within 48 hours. Under normal usage batteries will last
3 to 5 years.

To obtain maximum battery life and prevent damage, also
disconnect the battery backup if you unplug the motor unit
while on vacation or any other extended period of time.

NOTE: Door operation may be limited until batteries are fully
charged. The motor unit’s lights will not turn on during BBU
mode.

Holes for Ceiling Mount

Battery Backup
Unit (BBU)

Side Screw
Slots for
optional mounting

Lag Screw
1-1/2"

5

Battery Backup Unit (BBU) Diagnostics

GREEN LED:

All systems are normal.

• A solid LED light indicates the batteries are fully charged.

• A flashing LED indicates the batteries are being charged.

NOTE: Batteries do not have to be fully charged to operate the
motor unit.

YELLOW LED:

The motor unit has lost power and is operating off of
the BBU.

• A solid LED with beep, sounding approximately every 2
seconds, indicates the motor unit is activating the door and is
operating off of the BBU.

• A flashing LED with beep, sounding every 30 seconds,
indicates batteries are low.

• Once the power is restored the BBU will recharge. This is
indicated by a flashing green LED.

RED LED:

An error has been detected and the BBU will automatically shut
off. The BBU will attempt to restart by reconnecting to the
batteries. If the error is still present it will shut itself off again.
This process will repeat every 5 minutes or until the error has
been resolved. This is used to prevent further draining of the
batteries.

• If a red LED remains on when the power is restored, and is
accompanied by a beep sounding every 30 seconds, please
call for service.

©2007, The Chamberlain Group, Inc.

114A3382 All Rights Reserved

Australia
NSW, Vic, Qld, WA
Phone toll free 1800 638 234
Fax toll free 1800 888 121

New Zealand
Phone [phone]
Phone toll free 0800 653 667
Fax toll free 0800 653 663

United Kingdom
Phone [phone]
Fax [phone]

Germany
Phone [phone]
Fax [phone]

GARAGE DOOR OPENER WARRANTY

Chamberlain warrants to the first retail purchaser of this product (CM475) that the product
shall be free from any defect in materials and/or workmanship for a period of 12 full months (1
year) from the date of purchase. Upon receipt of the product, the first retail purchaser is under
obligation to check the product for any visible defects.

Conditions: The warranty is strictly limited to the reparation or replacement of the parts of
this product which are found to be defective and does not cover the costs or risks of
transportation of the defective parts or product.

This warranty does not cover non-defect damage caused by unreasonable use (including use
not in complete accordance with Chamberlain’s instructions for installation, operation and
care; failure to provide necessary maintenance and adjustment; or any adaptations of or
alterations to the products), labor charges for dismantling or reinstalling of a repaired or
replaced unit or replacement batteries.

A product under warranty which is determined to be defective in materials and/or
workmanship will be repaired or replaced (at Chamberlain's option) at no cost to the owner for
the repair and/or replacement parts and/or product. Defective parts will be repaired or
replaced with new or factory rebuilt parts at Chamberlain's option.

If, during the warranty period, the product appears as though it may be defective, contact your
original place of purchase.

This warranty does not affect the purchaser’s statutory rights under applicable national
legislation in force nor the purchaser’s rights against the retailer arising from their
sales/purchase contract. In the absence of applicable national or EU legislation, this warranty
will be the purchaser’s sole and exclusive remedy, and neither Chamberlain nor its affiliates or
distributors shall be liable for any incidental or consequential damages for any express or
implied warranty relating to this product.

No representative or person is authorized to assume for Chamberlain any other liability in
connection with the sale of this product

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(Yellow LED)

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