Evaporator Frosting/Icing — A One-Minute Troubleshooting and Handling Guide

Evaporator Frosting/Icing — A One-Minute Troubleshooting and Handling Guide

The evaporator is the 'radiator' of the refrigeration system, responsible for transferring heat from the cold storage to the refrigerant. If the frost layer exceeds 3 millimeters or ice forms directly, it's like covering the radiator with a blanket, preventing heat from being dissipated.

Frost has only one-thousandth the thermal conductivity of metal, causing the evaporator temperature to drop sharply. The refrigerant cannot fully evaporate, leading to a continuous decrease in suction pressure and significantly reduced cooling efficiency.

Common Causes:

Fan stopped or insufficient speed, resulting in poor air circulation

 defrosting time or termination temperature settings

Defrost heater damage

Quick Handling:

Check if the fan is operating normally; replace it if faulty
Re-adjust defrosting time and termination temperature (e.g., defrost once every 8 hours, set termination temperature to 5℃)
Test if the defrost heater is generating heat

Conclusion

Evaporator frosting may seem like a minor issue but has significant impacts. Timely handling can restore system efficiency and prevent the compressor from running under long-term low load.