Cold storage is a core facility for preserving food and pharmaceuticals. Its refrigeration system is like the heart of the human body; any minor fault can lead to temperature loss, product spoilage, or even accidents. Mastering scientific troubleshooting and standardized repair procedures is key to minimizing economic losses and extending equipment lifespan.
Common Fault Diagnosis: Combining Listening, Inspection, and Measurement
Cold storage faults often leave traces. When encountering the most common issue of "temperature not dropping," technicians must conduct a comprehensive diagnosis through listening, inspection, and measurement. First, "listen" to the compressor's operating sound; if there is a sharp friction sound or a dull overload sound, be alert to internal wear or voltage abnormalities. Second, "inspect" the evaporator and condenser; if the evaporator has excessive frost (over 5mm) or forms a transparent ice layer, it indicates a failed defrost system or poor refrigerant circulation, which severely hinders heat exchange. "Measure" system pressure and temperature; if suction and discharge pressures are low, accompanied by an abnormal "hissing" gas sound at the expansion valve, it is usually a clear sign of refrigerant leakage.
Core Component Repair: Targeted Solutions
Different fault sources require professional repair methods. If refrigerant leakage is confirmed, never blindly recharge refrigerant. First, use halogen leak detectors to precisely locate the leak point, perform welding or seal repair, and then evacuate and recharge. If the fault stems from poor condenser heat dissipation, shut down the system to clean dust and catkins from the fins, or descale the water-cooled system. For compressor overheating or efficiency degradation, technicians should check the oil level and quality of the refrigeration oil; if the oil turns black and turbid, replace it promptly, and test the motor's insulation resistance to prevent motor burnout.
Electrical and Defrost System Maintenance
The stability of electrical control and defrost systems is equally important. During maintenance, use an infrared thermometer to check the wiring terminals inside the electrical control box; if the temperature exceeds 60°C, it is a high-risk signal, and terminals must be tightened or aging components replaced immediately. Additionally, test the working cycle of the automatic defrost system (such as electric heating defrost or water defrost) to ensure effective defrosting without causing a sharp temperature rise in the storage due to prolonged cycles.
Professional Response and Standards
Cold storage repair requires a high level of professionalism, especially when involving ammonia refrigeration or ultra-low temperature storage, where a slight oversight can lead to poisoning or frostbite accidents. Therefore, when enterprises encounter complex faults, they should promptly contact a repair team with professional qualifications. Repair service providers typically maintain a comprehensive spare parts inventory and a 24-hour response mechanism, strictly implementing standards such as "lockout/tagout," "anti-static," and "clean operations." This ensures personnel safety while restoring cold storage operation as quickly as possible, safeguarding the enterprise's cold chain assets.
