The filter drier is the goalkeeper of a refrigeration system. It intercepts moisture, contaminants and acid in the refrigerant line before they reach precision parts such as the compressor. Kilterra KLD/KLE liquid-line filter driers combine high-efficiency molecular sieve with activated alumina for one-step drying and filtration, widely used in commercial air conditioning, chillers and ice makers.
Common Faults and Diagnosis
- Large inlet-outlet temperature difference, condensation or frost - blocked filter element
- Bubbles in sight glass, repeated ice blockage - saturated desiccant, excess moisture
- Compressor short-cycling on high pressure - blockage causing abnormal high pressure
- Oil weeping at joints - seal incompatibility with refrigerant/lubricant
Prevention
- Check every 2-3 years on normal units; replace when pressure drop rises or desiccant discolors
- Always replace after major system repair or compressor replacement
- Foggy sight glass and large inlet-outlet temperature difference are failure signals
- Replace after topping up refrigerant or touching the line - low cost, high protection
Diagnostic Approach
Refrigerant circulating in the line carries three harmful substances: moisture, debris and acid. Inside the filter drier, molecular sieve adsorbs water, the filter screen traps solid particles, and activated alumina neutralizes acid. It does not take part in cooling, but without it, moisture freezes at the expansion valve (ice blockage), debris wears the valve plates, and acid corrodes the motor windings - the compressor becomes the first victim.
For 37 years Kilterra has focused on one thing: build refrigeration components right, deliver them on time. Filter Drier supports OEM/ODM customization - factory visits, sample testing and volume partnerships are welcome.