A CAD cell eye is a type of photocell typically mounted inside the oil burner tube, usually near the rear. Its primary function is to “see” the flame produced by the oil burner during operation.
Key Facts
- Function: The CAD cell eye is a type of photo cell that is typically mounted inside the oil burner tube, usually near the rear. Its primary function is to “see” the flame produced by the oil burner during operation.
- Sensing Mechanism: The CAD cell eye contains a cadmium sulfide (CdS) sensor, which is sensitive to light. When the oil burner is operating correctly and a flame is present, the sensor detects the light emitted by the flame.
- Electrical Connection: The CAD cell eye is wired to a cad cell relay switch, which is usually a gray box with a red “reset” button located on top of or alongside the oil burner assembly. The sensor’s electrical connection to the relay switch is typically made through a yellow wire.
- Safety Function: If the CAD cell eye fails to detect a flame or if the flame becomes weak or goes out, it sends a signal to the cad cell relay switch. In response, the relay switch shuts down the oil burner to prevent the continued pumping of oil into the combustion chamber, which could lead to unsafe conditions.
- Maintenance: The CAD cell eye can become coated with soot over time, reducing its ability to “see” the flame accurately. Regular cleaning and maintenance of the sensor are necessary to ensure its proper functioning.
Sensing Mechanism
The CAD cell eye contains a cadmium sulfide (CdS) sensor, which is sensitive to light. When the oil burner is operating correctly and a flame is present, the sensor detects the light emitted by the flame.
Electrical Connection
The CAD cell eye is wired to a cad cell relay switch, which is usually a gray box with a red “reset” button located on top of or alongside the oil burner assembly. The sensor’s electrical connection to the relay switch is typically made through a yellow wire.
Safety Function
If the CAD cell eye fails to detect a flame or if the flame becomes weak or goes out, it sends a signal to the cad cell relay switch. In response, the relay switch shuts down the oil burner to prevent the continued pumping of oil into the combustion chamber, which could lead to unsafe conditions.
Maintenance
The CAD cell eye can become coated with soot over time, reducing its ability to “see” the flame accurately. Regular cleaning and maintenance of the sensor are necessary to ensure its proper functioning.
References
- Checking CAD Cell — Heating Help: The Wall
- Cad Cell Relay Control Guide: heating system reset switch instructions; a guide to inspecting and re-setting the cad cell relay safety device on oil burners
FAQs
What is the function of a CAD cell eye?
The CAD cell eye is a photocell that detects the presence of a flame in an oil burner.
How does the CAD cell eye detect the flame?
The CAD cell eye contains a cadmium sulfide (CdS) sensor, which is sensitive to light. When the oil burner is operating correctly and a flame is present, the sensor detects the light emitted by the flame.
What happens if the CAD cell eye fails to detect a flame?
If the CAD cell eye fails to detect a flame or if the flame becomes weak or goes out, it sends a signal to the cad cell relay switch, which shuts down the oil burner to prevent the continued pumping of oil into the combustion chamber.
How can I maintain the CAD cell eye?
Regular cleaning and maintenance of the CAD cell eye are necessary to ensure its proper functioning. This includes removing any soot or debris that may have accumulated on the sensor.
What are the signs of a faulty CAD cell eye?
Signs of a faulty CAD cell eye may include the oil burner shutting down unexpectedly, intermittent operation of the burner, or a lack of response to the reset button.
Can I replace the CAD cell eye myself?
Replacing a CAD cell eye is a relatively simple task that can be done by most homeowners with basic tools. However, it is important to follow the manufacturer’s instructions carefully to ensure proper installation.
How often should I replace the CAD cell eye?
The frequency of replacement for a CAD cell eye depends on the specific model and operating conditions. However, most manufacturers recommend replacing the sensor every one to two years to ensure optimal performance.
Where can I find a replacement CAD cell eye?
Replacement CAD cell eyes can be purchased from various sources, including online retailers, home improvement stores, and HVAC supply companies.