Capillary Tube Side Freezing in AC Systems – What It Means and How to Fix It
When an air conditioner exhibits frost at the evaporator inlet , specifically starting from the capillary tube side and spreading along the evaporator surface, this may appear as a normal frosting pattern. However, excessive or full-surface frosting is a red flag that indicates inefficiencies or faults in the system that need immediate attention. 🔍 Common Causes of Inlet Frosting Low Refrigerant Charge Insufficient refrigerant leads to low suction pressure and lower evaporating temperature, causing premature frosting as the refrigerant hasn't fully vaporized. Poor Airflow or Heat Exchange Dirty filters, slow fan speed, or clogged fins reduce heat absorption, preventing the refrigerant from evaporating properly. Capillary Tube Blockage Partial clogging slows refrigerant flow, creating localized cooling and frost buildup at the inlet. Low Load or Cold Ambient Temperature If the indoor room is too cold or underloaded, refrigerant evaporates slowly, leading to ov...
