3-wire.N12-5 0857.Refrigerator Defrost Thermostat. SNR-014
This device is an SNR-014 Refrigerator Defrost Thermostat (also identified by the model number N12-5 0857). It is a critical 3-wire bimetal component used in frost-free refrigerators to regulate the defrost cycle and prevent overheating.
Technical Specifications
- Model Number: SNR-014 / N12-5 0857.
- Electrical Rating: Typically AC 250V / 10A.
- Operating Temperature: Opens (cuts power) at approximately -5°C (23°F) to terminate the defrost cycle.
- Safety Fuse: Includes an integrated thermal fuse rated at 72°C (161.6°F), which acts as a secondary safety to permanently cut power if the defrost heater stays on too long and risks damaging the appliance.
- Configuration: 3-wire system (Common, Cooling, and Defrost) housed in a waterproof sealed plastic tube for protection against moisture and ice.
Core Function
The thermostat is mounted directly onto the evaporator coil inside the freezer. Its job is to manage the power flow to the defrost heater:
- Detection: When it senses that the evaporator coil is cold enough (frost is present), it allows the defrost circuit to be active.
- Termination: As the heater melts the ice, the coil temperature rises. Once it hits approximately -5°C, the bimetallic strip inside the thermostat clicks open, cutting power to the heater even if the defrost timer hasn’t finished its cycle yet. This prevents the freezer from getting too hot.
- Safety: If the bimetal fails to open, the internal 72°C fuse will blow to prevent a fire or melting of plastic parts.
Common Symptoms of Failure
If this part is faulty, you may notice:
- Heavy frost buildup on the back panel of the freezer, which eventually blocks airflow and causes the fridge section to stay warm.
- Continuous compressor running as the unit struggles to cool through the ice.
Description
Description
This device is an SNR-014 Refrigerator Defrost Thermostat (also identified by the model number N12-5 0857). It is a critical 3-wire bimetal component used in frost-free refrigerators to regulate the defrost cycle and prevent overheating.
Technical Specifications
- Model Number: SNR-014 / N12-5 0857.
- Electrical Rating: Typically AC 250V / 10A.
- Operating Temperature: Opens (cuts power) at approximately -5°C (23°F) to terminate the defrost cycle.
- Safety Fuse: Includes an integrated thermal fuse rated at 72°C (161.6°F), which acts as a secondary safety to permanently cut power if the defrost heater stays on too long and risks damaging the appliance.
- Configuration: 3-wire system (Common, Cooling, and Defrost) housed in a waterproof sealed plastic tube for protection against moisture and ice.
Core Function
The thermostat is mounted directly onto the evaporator coil inside the freezer. Its job is to manage the power flow to the defrost heater:
- Detection: When it senses that the evaporator coil is cold enough (frost is present), it allows the defrost circuit to be active.
- Termination: As the heater melts the ice, the coil temperature rises. Once it hits approximately -5°C, the bimetallic strip inside the thermostat clicks open, cutting power to the heater even if the defrost timer hasn’t finished its cycle yet. This prevents the freezer from getting too hot.
- Safety: If the bimetal fails to open, the internal 72°C fuse will blow to prevent a fire or melting of plastic parts.
Common Symptoms of Failure
If this part is faulty, you may notice:
- Heavy frost buildup on the back panel of the freezer, which eventually blocks airflow and causes the fridge section to stay warm.
- Continuous compressor running as the unit struggles to cool through the ice.
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