xindacool Original Manufacturer of Refrigeration Equipment | High- and Low-Pressure Protection Logic for Refrigeration Units, Troubleshooting Alarm Causes, and the Dangers of Bypassing Protective Circuits

xindacool Original Manufacturer of Refrigeration Equipment | High- and Low-Pressure Protection Logic for Refrigeration Units, Troubleshooting Alarm Causes, and the Dangers of Bypassing Protective Circuits
Key Conclusion: High- and low-pressure protection serves as the most critical safety barrier for refrigeration units. Bypassing protective switches on-site is strictly prohibited. Distinguish between the three categories of causes—system, environmental, and equipment—and follow standardized procedures to identify the root cause of faults.
High-pressure protection prevents the risk of pipe rupture caused by excessive system pressure; Low-pressure protection prevents liquid slugging and compressor damage caused by dry running due to excessively low evaporation pressure. Xindacool units feature dual protection via hardware pressure switches and software pressure monitoring; hardware protection triggers an immediate cutoff of compressor power, while software protection issues a warning and reduces load. Common causes of high-pressure alarms include: poor condenser heat dissipation, dirty or clogged fins, ambient temperatures exceeding T3 operating conditions, overcharging of refrigerant, and the presence of non-condensable gases within the system. Common causes of low-pressure alarms include: clogged filters, expansion valve failure, insufficient refrigerant, fan failure, and sudden load drops.
Many field technicians bypass high- and low-pressure protections to temporarily restart the unit, which is a highly dangerous practice. Once protections are bypassed, abnormal system pressures go unchecked; at best, this can result in compressor burnout; at worst, it can cause heat exchangers to rupture due to overpressure, leading to massive refrigerant leaks, equipment damage, and safety hazards. Temporary bypassing is not permitted during long-term operation; if bypassing is absolutely necessary for testing, restore the system immediately upon completion of the test—the system must not be operated with a fault for an extended period.
Troubleshooting must follow these steps: First, check the ambient temperature and heat dissipation conditions; then verify that the fan is operating normally; review the refrigerant pressure and temperature parameters; inspect the filter and throttling components; and only then suspect a fault in the pressure sensor or switch itself. Pressure switches and sensors require regular calibration; after years of use, drift can cause false alarms. When an alarm occurs, do not repeatedly reset and restart the unit. If alarms occur multiple times in succession, the root cause must be identified before restarting. Technical documentation provided upon project handover will include explanations of alarm codes to help operations and maintenance personnel quickly pinpoint the issue.
FAQ
1. Can high- and low-pressure protection be bypassed temporarily for production? Long-term bypassing is strictly prohibited and is considered a high-risk operation.
2. Does a high-pressure alarm always indicate equipment failure? Many cases are caused by poor heat dissipation conditions.
3. Does a low-pressure alarm always mean a refrigerant shortage? A clogged filter or faulty valves can also trigger a low-pressure alarm.
4. Can pressure sensors drift and cause false alarms? This is possible after many years of use; calibration is required.
5. What happens if alarms are frequently reset? It can exacerbate the fault and damage the compressor.
6. Can non-condensable gases trigger a high-pressure alarm? Air entering the system can raise the condensing pressure.
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