Description
A 20g fridge drier (filter drier) is a crucial copper component in a refrigerator’s sealed system, installed to protect vital components by removing moisture and filtering out contaminants from the circulating refrigerant. The “20g” refers to the weight of the desiccant material (molecular sieve) contained within the spun copper shell.
Key Specifications
| Attribute | Typical Value | Source |
|---|---|---|
| Desiccant Content | 20 grams (molecular sieve/silica gel) | |
| Material | Spun Copper shell with internal filter screens | |
| Connections | One end 1/4″ pipe, other end capillary | |
| Diameter | ~19mm outer diameter | |
| Length | ~141mm typical length | |
| Application | Domestic refrigerators, freezers, and small commercial refrigeration units | |
| Compatibility | Suitable for various refrigerants, including R134a |
Function in a Refrigeration System
The filter drier is installed in the liquid line, typically between the condenser and the capillary tube or expansion valve. Its two main functions are:
- Moisture Removal: The desiccant material absorbs water vapor from the refrigerant. Water in the system can cause ice blockages at the capillary tube and lead to the formation of corrosive acids, which can severely damage the compressor.
- Contaminant Filtration: Internal filter screens capture solid particles like metal chips, dirt, and copper oxides produced during the system’s operation or servicing, preventing them from clogging the capillary tube or damaging the compressor and expansion valve.
The 20g size is typically used for smaller domestic refrigeration applications. It is a non-serviceable, hermetic component that is replaced every time the sealed system is opened for repairs.
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