Chamberlain LiftMaster PROFESSIONAL 475LM - User Manual

STANDBY POWER UNIT
Model 475LM Owner’s Manual
INSTALLATION
Mounting the standby power unit (SPU) can be done using one
of two methods. The SPU can be mounted directly on top of the
motor unit or it can be secured on a structural support just
above it.
1. Mounting the SPU Directly to the Motor Unit.
•
Position the SPU on top of the motor unit. Make sure the
motor unit power cord is drawn out from beneath the SPU.
The SPU should sit firmly on top of the motor unit. Adjust
angle iron placement so that it is out of the way of the SPU’s
installation (Figure 1).
• Align the two screw slots on the SPU to the back chassis
holes.
• Secure the SPU to each side of the chassis flanges with 3/4"
screws provided.
2. Mounting the SPU Directly to a Structural Support.
• After the motor unit has been installed, the SPU can be
mounted to either the ceiling or a wall within 3' (.9 m) of the
motor unit.
• Position the SPU as desired to a structural support (ceiling
joist or wall stud) (Figure 2).
• Attach the SPU to the support using the mounting holes on
either side of the SPU.
• Secure the SPU using the 1-1/2" lag screws (provided).
3. Connect the SPU to the Motor Unit.
• Disconnect the motor unit from the electrical outlet.
• Connect the SPU cord into the connector on the
end panel on the motor unit. Connect the motor
unit to the electrical outlet. The SPU will activate
and all LEDs will turn on for 3 seconds.
• The green LED will begin flashing, indicating the
SPU is charging from the motor unit.
IMPORTANT NOTE: Installation of SPU when
permanent electrical power is not available (such as
new construction and the electricity is not installed)
may damage the batteries. Unplug SPU after testing
to prevent damage.
Figure 1
Figure 2
To prevent possible SERIOUS INJURY or DEATH from
electrocution, disconnect ALL electric and battery power
BEFORE performing ANY service or maintenance.
ALWAYS wear protective gloves and eye protection
when changing the battery or working around the battery
compartment.
Power Cord
Power Cord
SPU Cord
SPU
Connector
SPU Cord
475LM Standby
Power Unit
475LM Standby
Power Unit
Bring Power
Cord out left
side slot
Bring SPU Cord out right
side slot away from Antenna
Side Screw
Slots for
Chassis Mount
Standby Power
Unit (SPU)
Holes for
Ceiling
Mount
Lag
Screw
1-1/2"
Structural
Supports
Lag Screws
1-1/2"
3/4" Screw
3/4" Screw
For more information, please visit www.devancocanada.com or call toll free at 855-931-3334

Summary

Safety and Warnings

Electrical Hazard Warning

Disconnect all electric and battery power before performing any service or maintenance to prevent electrocution.

Protective Gear Caution

Always wear protective gloves and eye protection when changing the battery or working around the battery compartment.

Installation

Mounting SPU Directly to Motor Unit

Position and secure the SPU on top of the motor unit using 3/4" screws into the back chassis holes.

Mounting SPU to Structural Support

Attach the SPU to a structural support like a ceiling joist or wall stud using 1-1/2" lag screws.

Connecting SPU to Motor Unit

Connect the SPU cord to the motor unit connector and restore power to activate and charge the SPU.

SPU Diagnostics and Operation

Testing SPU Functionality

Test the installed SPU by disconnecting power, observing LED indicators, and operating the garage door.

Battery Charging and Life

Allow 24-48 hours for full charge; batteries last 3-5 years. Disconnect SPU during extended motor unit unplugging.

LED Indicator Guide

Understand Green (normal), Yellow (battery power/low battery), and Red (error) LED signals for SPU status.

Replacement Parts

Ordering Information

Order parts from Devanco Canada by providing part number, description, and model number.

Overview

1. Function Description
2. Important Technical Specifications
3. Usage Features
4. Maintenance Features

The Chamberlain LiftMaster Professional Standby Power Unit (SPU) Model 475LM is an essential accessory designed to provide backup power to a garage door opener during electrical outages. This unit ensures continued operation of the garage door, enhancing convenience and security even when the main power supply is interrupted.

Function Description:

The SPU's primary function is to supply 24 Vdc power to the motor unit of a garage door opener when the primary electrical power is unavailable. This allows the garage door to be opened and closed normally for a period, typically one to two days of normal operation, depending on usage and battery charge. The unit features an internal battery system that automatically takes over when a power loss is detected. Once electrical power is restored, the SPU automatically recharges its batteries.

Important Technical Specifications:

• Power Output: 24 Vdc to the motor unit.
• Battery Life (Normal Usage): 3 to 5 years.
• Recharge Time: 24 to 48 hours for a full charge after an outage.
• Battery Type: Two 12V rechargeable batteries (Chamberlain part #41B591).
• Mounting Options: Can be mounted directly on top of the motor unit or to a structural support (ceiling joist or wall stud) within 3 feet (.9 m) of the motor unit.
• Included Hardware: 3/4" screws for motor unit mounting, 1-1/2" lag screws for structural support mounting.
• Components: Power Supply Board (Chamberlain part #41A5726), Fuse (Chamberlain part #72A35).

Usage Features:

The SPU is designed for ease of use and provides clear indicators of its status:

• Automatic Power Transfer: Seamlessly switches to battery power upon an outage and back to main power when restored.
• LED Diagnostics:
  • Green LED: Indicates normal system operation. A solid green LED means batteries are fully charged, while a flashing green LED indicates batteries are charging.
  • Yellow LED: Signifies that the motor unit is operating off the SPU due to a power loss. A solid yellow LED with a beep (every 2 seconds) indicates door activation, while a flashing yellow LED with a beep (every 30 seconds) indicates low battery charge.
  • Red LED: Indicates an error. The SPU will attempt to restart by reconnecting to the batteries. If the error persists, it will shut off and repeat the restart attempt every 5 minutes to prevent further battery drain. A persistent red LED with a beep (every 30 seconds) after power restoration requires service.
• Testing Procedure: The SPU can be tested by disconnecting the motor unit's power cord from the electrical outlet. This allows users to verify battery operation, check battery charge status via the yellow LED, and confirm proper functioning by opening and closing the garage door.
• Battery Protection: The system is designed to disconnect batteries if their voltage drops too low, preventing damage.
• Installation Flexibility: Offers two mounting methods to accommodate different garage setups.

Maintenance Features:

Proper maintenance ensures the longevity and reliability of the SPU:

• Battery Replacement: The unit uses two 12V rechargeable batteries (Chamberlain part #41B591). It is crucial to use only specified replacement batteries to avoid fire or injury. Batteries typically last 3 to 5 years under normal usage.
• Charging: Allow 24 to 48 hours for batteries to fully charge before relying on the SPU system.
• Disconnection for Extended Periods: To maximize battery life and prevent damage, it is recommended to disconnect the standby power unit if the motor unit is unplugged for an extended period, such as during vacations or other prolonged absences.
• Safety Precautions: Always disconnect ALL electric and battery power before performing any service or maintenance to prevent serious injury or death from electrocution. Wear protective gloves and eye protection when working around the battery compartment.
• Troubleshooting: The LED diagnostics provide clear indications for troubleshooting. A persistent red LED after power restoration, accompanied by a beep, signals a need for professional service.
• Installation Note: Installing the SPU when permanent electrical power is not available (e.g., new construction) can damage the batteries. It is important to unplug the SPU after initial testing in such scenarios to prevent damage.

The Chamberlain LiftMaster Professional Standby Power Unit Model 475LM is a robust and user-friendly solution for maintaining garage door functionality during power outages, offering peace of mind through its reliable performance and clear diagnostic indicators.

Chamberlain LiftMaster PROFESSIONAL 475LM Specifications