Clogged Filter Drier Issue in Refrigeration and Air Conditioning Systems

In this article, we’ll learn step-by-step how to detect a clogged filter drier in freezing, refrigeration, and air conditioning systems.

1. What Happens with a Clogged Filter Drier?
   A clogged filter drier causes a significant pressure drop in the refrigerant flow passing through the system.
2. Pressure Drop Values by System Type

• Air Conditioning: Pressure drop of 7.2 PSI.
• Refrigeration: Pressure drop of 3.6 PSI.
• Freezing: Pressure drop of 2 PSI.

3. Relationship Between Pressure Drop and Temperature
   The pressure drop correlates with a temperature drop that varies depending on the refrigerant gas and the system application.

Air Conditioning

• R410A and R32 gases: Temperature drop of 1°C.
• R290 gas: Temperature drop of 1.5°C.

Refrigeration

• R134a and R290 gases: Temperature drop of 1°C.
• R404A gas: Temperature drop of 0.8°C.
• R600A gas: Temperature drop of 2°C.

Freezing

• R404A gas: Temperature drop of 0.4°C.
• R290 gas: Temperature drop of 0.5°C.
• R507 gas: Temperature drop of 0.4°C.