LiftMaster 3850 3850 Elite Series Manual - Page 29

EverCharge® Standby Power System (optional) OPERATING INSTRUCTIONS 1. Test the installed battery with the motor unit. To test the battery, disconnect the motor unit power cord from the electrical outlet. • A solid orange LED indicates the battery is operating on battery power. • A flashing orange LED with beep indicates the unit 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 motor unit power cord back into the electrical outlet. • Verify that the green LED is flashing on the SPU (indicates that the battery is now charging). • Test completed. To reduce the risk of FIRE or INJURY to persons: • Disconnect ALL electric and battery power BEFORE performing ANY service or maintenance. • Use ONLY LiftMaster part number 485LM for replacement battery. • DO NOT dispose of battery in fire. Battery may explode. Check with local codes for disposal instructions. ALWAYS wear protective gloves and eye protection when changing the battery or working around the battery compartment. 2. Charge the battery. • Battery will take 24 to 48 hours to fully charge. A fully charged battery supplies 12 Vdc 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 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 motor unit is unplugged for an extended period of time. NOTE: Door operation may be limited until battery is fully charged. The motor unit's lights will not turn on during battery mode. Battery Status LED NOTE: LED is most visible with worklight 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 do not have to be fully charged to operate the motor unit. ORANGE LED: The motor unit has lost power and is operating off of the battery. • A solid LED with beep, sounding approximately every 2 seconds, indicates the motor unit is activating the door and is operating off of 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. • To obtain maximum battery life and prevent damage, also disconnect the battery if you unplug the motor unit while on vacation or ANY other extended period of time. 29