Chamberlain 475M Owner's Manual page 2

CAUTION
To reduce the risk of FIRE or INJURY to persons use only
Chamberlain part #41B591 for replacement batteries.
OPERATION
1. Test the installed SPU with the motor unit.
To test the SPU, disconnect the motor unit power cord
from the electrical outlet.
• A solid yellow LED indicates the SPU is operating on
battery power.
• A flashing yellow LED with beep indicates the SPU is
operating on battery power and that the battery charge
is low.
• To test whether the SPU 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 SPU
(indicates that the SPU is now charging).
• Test completed.
2. Charge the battery.
• Allow the batteries 24 to 48 hours to fully charge before
using the SPU system.
A fully charged SPU 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 standby power 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 SPU mode.
Replacement Parts
12V Rechargeable Batteries (2) . . . . . . . . . . . . . .41B591
Power Supply Board . . . . . . . . . . . . . . . . . . . . .41A5726
Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .72A35
FOR SERVICE, DIAL OUR TOLL-FREE NUMBER:
1-800-528-9131
114A2745D
STANDBY POWER UNIT (SPU) 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 SPU.
• A solid LED with beep, sounding approximately every 2
seconds, indicates the motor unit is activating the door
and is operating off of the SPU.
• A flashing LED with beep, sounding every 30 seconds,
indicates batteries are low.
• Once the power is restored, the SPU will recharge. This
is indicated by a flashing green LED.
RED LED:
An error has been detected and the SPU will
automatically shut off. The SPU 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.
All Rights Reserved
(Yellow LED)
(Red LED) (Green LED)