4-wire.OF0320.Defrost Temperature Control.SNR-018
This device is an SNR-018 Defrost Temperature Control, a 4-wire bimetal thermostat assembly used in frost-free refrigerators. It is commonly used as a replacement part for LG and Kenmore refrigeration models (often replacing OEM part numbers like 6615JB2005A, 6615JB2005C, and 6615JB2005V).
Technical Specifications
- Part Number: SNR-018 / OF0320.
- Voltage/Current Rating: Typically rated for AC 250V / 10A or AC 120V / 10A depending on the specific region’s electrical standards.
- Operating Temperature: Designed to open (cut power) once the evaporator coil reaches a specific temperature (usually around 5°C to 10°C) to ensure the defrost heater stops once the ice has melted.
- Configuration: 4-Wire Assembly featuring a white plastic connector plug. It houses a bimetal thermostat and a thermal fuse within a waterproof sealed plastic sleeve.
- Safety Fuse: Includes an internal thermal fuse (often rated at 72°C) that acts as a permanent fail-safe to cut power if the defrost system fails to shut off, preventing the refrigerator from overheating.
Core Functionality
This assembly is a critical regulator for the automatic defrost system, typically clipped directly onto the evaporator coil inside the freezer:
- Defrost Termination: During a defrost cycle, the bimetal switch monitors the coil’s temperature. Once the frost is gone and the coil warms up, the switch “pops” open, interrupting power to the defrost heater.
- Safety Backup: The integrated thermal fuse provides a secondary layer of protection. If the primary bimetal switch fails to open, the fuse will blow to prevent potential fire hazards or damage to the refrigerator’s plastic interior.
- Environmental Protection: The components are encased in a heavy-duty, moisture-proof sleeve to withstand the constant condensation and ice buildup inside the freezer.
Common Symptoms of Failure
When this part fails, the refrigerator’s automatic defrost cycle will stop working, leading to:
- Heavy Frost/Ice Build-up: On the back panel of the freezer, which eventually blocks airflow.
- Warm Fridge Section: While the freezer remains cold, the fresh food section stays warm because air cannot circulate through the iced-up evaporator coils.
- Compressor Overworking: The unit may run continuously to try and reach the set temperature through the insulating layer of ice.
Description
Description
This device is an SNR-018 Defrost Temperature Control, a 4-wire bimetal thermostat assembly used in frost-free refrigerators. It is commonly used as a replacement part for LG and Kenmore refrigeration models (often replacing OEM part numbers like 6615JB2005A, 6615JB2005C, and 6615JB2005V).
Technical Specifications
- Part Number: SNR-018 / OF0320.
- Voltage/Current Rating: Typically rated for AC 250V / 10A or AC 120V / 10A depending on the specific region’s electrical standards.
- Operating Temperature: Designed to open (cut power) once the evaporator coil reaches a specific temperature (usually around 5°C to 10°C) to ensure the defrost heater stops once the ice has melted.
- Configuration: 4-Wire Assembly featuring a white plastic connector plug. It houses a bimetal thermostat and a thermal fuse within a waterproof sealed plastic sleeve.
- Safety Fuse: Includes an internal thermal fuse (often rated at 72°C) that acts as a permanent fail-safe to cut power if the defrost system fails to shut off, preventing the refrigerator from overheating.
Core Functionality
This assembly is a critical regulator for the automatic defrost system, typically clipped directly onto the evaporator coil inside the freezer:
- Defrost Termination: During a defrost cycle, the bimetal switch monitors the coil’s temperature. Once the frost is gone and the coil warms up, the switch “pops” open, interrupting power to the defrost heater.
- Safety Backup: The integrated thermal fuse provides a secondary layer of protection. If the primary bimetal switch fails to open, the fuse will blow to prevent potential fire hazards or damage to the refrigerator’s plastic interior.
- Environmental Protection: The components are encased in a heavy-duty, moisture-proof sleeve to withstand the constant condensation and ice buildup inside the freezer.
Common Symptoms of Failure
When this part fails, the refrigerator’s automatic defrost cycle will stop working, leading to:
- Heavy Frost/Ice Build-up: On the back panel of the freezer, which eventually blocks airflow.
- Warm Fridge Section: While the freezer remains cold, the fresh food section stays warm because air cannot circulate through the iced-up evaporator coils.
- Compressor Overworking: The unit may run continuously to try and reach the set temperature through the insulating layer of ice.
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