17
INSTALLATION STEP 11
Install the Battery Backup
• Make sure the opener is unplugged.
• Open the lens cover at the power cord end.
• Using a Phillips-head screwdriver, remove the battery
cover on the opener.
• Partially insert battery into the opener with the
terminals facing out.
• Connect red (+) and black (-) wires from the opener to
corresponding terminals on battery.
• Replace battery and lens covers.
•
CONNECT THE OPENER TO MAINS POWER.
NOTE: Opener will operate without battery installed,
when mains power is connected.
Battery
Battery Cover
Charging the battery.
• Battery will take 24 to 48 hours to fully charge.
A fully charged battery supplies 12 V DC to the opener
for one to two days of normal operation during an
electrical power outage. If the battery voltage drops too
low, the battery will disconnect and the opener will no
longer operate under battery power.
After the electrical power has been restored, the battery
will recharge within 48 hours. Under normal usage
batteries will last 3 to 5 years.
To obtain maximum battery life and prevent damage,
disconnect the battery when opener is unplugged for
an extended period of time.
NOTE: Door operation may be limited until battery is
fully charged. The opener’s lights will not turn on
during battery mode.
Battery Backup
OPERATING INSTRUCTIONS
1. Test the installed battery with the opener after the
limits and force have been set.
To test the battery, disconnect the opener power cord
from the electrical outlet.
• A solid orange LED indicates the opener is operating
on battery power.
• A flashing orange LED with beep indicates the opener
is operating on battery power and that the battery
charge is low.
• To test the battery is functioning properly, open and
close the garage door.
• Re-connect the opener power cord into the electrical
outlet.
• Verify that the green LED is flashing on the Battery
status LED (indicates that the battery is now charging).
• Test completed.
Battery
Status LED
NOTE: LED is most visible with opener light off.
GREEN LED:
All systems are normal.
• A solid LED light indicates the battery is fully charged.
• A flashing LED indicates the battery is being charged.
NOTE: Battery does not have to be fully charged to
operate the opener.
ORANGE LED:
The opener has lost mains power and is operating on
battery power.
• A solid LED with beep, sounding approximately every
2 seconds, indicates the opener is activating the door
and is operating off the battery.
• A flashing LED with beep, sounding every 30 seconds,
indicates battery is low.
• Once the power is restored the battery will recharge.
This is indicated by a flashing green LED.
RED LED:
• If a red LED remains on when the power is restored,
and is accompanied by a beep sounding every 30
seconds, replace the battery and allow 48hrs for it to
fully charge. If the RED LED remains on after this time
contact a qualified door technician.
To reduce the risk of FIRE or INJURY to persons:
• Do NOT wear rings, watches or metal bracelets whilst handling
the battery.
• Disconnect ALL electric and battery power BEFORE
performing ANY service or maintenance.
• Use only Chamberlain part # 041A6357-2 for replacement
battery.
• Do NOT dispose of battery by burning. Battery may explode.
Check with local authority for disposal instructions.
Summary of Contents for Merlin Whisper Drive MT3850EVO
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