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Craftsman 139.53978SRT Mounting and Wiring the Safety Sensors, Aligning the Safety Sensors

Models: 139.53978SRT

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MOUNTING AND WIRING THE SAFETY SENSORS

•Slide a 1/4"-20xl/2" carriage bolt head into the slot on each sensor. Use wing nuts to fasten sensors to brackets, wRh lenses pointingtoward each other across the door. Be sure the lens is not obstructed by a bracket extension. See Figure 5.

•Finger tighten the wing nuts.

•Run the wires from both sensors to the opener. Use insulated staples to secure wire to wall and ceiling.

•Strip 1/4" of insulationfrom each set of wires.

Separate white and white/black wires sufficientlyto connect to the opener terminal screws: white to 2 and white/black to 3.

ALIGNING THE SAFETY SENSORS

•Plug in the opener. The indicator lights in both the sending and receiving eyes will glowsteadilyit wiring connections and alignment are correct.

The sending eye orange indicator light will glow regardless of alignment or obstruction. If the green indicator light in the receiving eye is off, dim, or flickering (and the invisible light beam path is not obstructed), alignment is required.

•Loosen the sendingeye wing nut and readjust, aiming directly at the receiving eye. Lock in place.

•Loosen the receiving eye wing nut and adjust sensor until Ltreceives the sender'sbeam. When the green

indicator light glows steadily, tighten the wing nut.

Figure 6 Wiring the Safety Sensors

Figure 5

Wing nut

1/4" 20x1/2"

Cardage bo]_

Trouble Shooting the Safety Sensors

1.If the sendingeyeindicator light does not g/ow steadiiyafter installation,check for:

•Electric power to the opener.

•A short in the white or white/black wires. These can occur at staples, or at screw terminal connections.

•Incorrectwiring between sensors and opener.

•A broken wire.

2.If the sending eye indicator lightg/owe steadi/ybut the receiving eye indicator light doesn't:

•Check alignment.

•Check for a broken wire to the receiving eye.

3.If the receiving eye indicator light is dim, realign either sensor.

NOTE: When the invisib/e beam path is obstructedor misa/igned whi/e the door is c/osing, the door wi// reverse, ff the door is already open, # wi//not c/ose. The opener fights wi// f/ash 10 times. (/f bulbs are not

installed, 10 clicks can be heard.) See page 21.

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Craftsman 139.53978SRT owner manual Mounting and Wiring the Safety Sensors, Aligning the Safety Sensors
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139.53978SRT specifications

The Craftsman 139.53978SRT is an advanced garage door opener that combines reliability, performance, and ease of use. Designed to cater to the needs of modern homeowners, this model stands out with its robust features and technological innovations.

One of the key highlights of the Craftsman 139.53978SRT is its powerful motor, delivering a peak horsepower equivalent to ensure smooth and efficient operation. This allows it to effortlessly lift even the heaviest of garage doors, making it suitable for various types of residential garage doors. The quiet operation of this opener is another major advantage, allowing for a peaceful environment in and around the garage.

Another notable feature is the smart technology integration. The Craftsman 139.53978SRT is compatible with a range of smart home systems, allowing users to control their garage door remotely via a smartphone app. This feature not only adds convenience but also enhances security, as users can receive alerts and notifications about the status of their garage door, ensuring peace of mind.

Security is a priority with this model, which comes equipped with rolling code technology. This mechanism generates a new code each time the remote is used, preventing unauthorized access and ensuring that your garage remains secure from intruders. Additionally, the enhanced safety features include safety sensors that detect obstacles, automatically reversing the door's movement if something is detected, thereby preventing accidents.

Installation and setup are straightforward, thanks to the user-friendly design of the Craftsman 139.53978SRT. The unit includes detailed instructions and all necessary hardware for installation. Many users can set it up within a few hours without the need for professional assistance.

With a durable construction, the Craftsman 139.53978SRT is built to last. It has a sleek design that complements various home aesthetics while withstanding wear and tear from daily use. Maintenance is minimal, with easy access to essential components for servicing.

In summary, the Craftsman 139.53978SRT offers a perfect blend of power, technology, and security features. Its user-friendly design, combined with smart technology compatibility and robust safety measures, makes it an ideal choice for homeowners seeking a reliable garage door opener. Whether you’re looking to upgrade an old system or install a new one, this model is sure to meet your requirements and enhance the functionality of your garage.