When a constant temperature and humidity test chamber experiences a cooling failure, it can be a frustrating and time-consuming issue. Troubleshooting this problem requires a systematic approach to identify the root cause. Below are some common checks and observations that Beijing Yashilin recommends for diagnosing refrigeration issues in such chambers.
1. First, check whether the refrigeration compressor starts when the test chamber is running. If the compressor is operational, it indicates that the electrical circuit from the main power supply to the compressors is functioning properly, and there’s no electrical failure in the system.
2. If the electrical system is not at fault, move on to inspect the refrigeration system itself. Begin by checking the discharge and suction pressures of the low-temperature compressors (R23 or R404) in both refrigeration units. If these pressures are below normal levels, especially if the suction pressure is low or evacuated, it suggests that the refrigerant charge in the main unit is insufficient.
3. In a safe condition, manually touch the discharge and suction lines of the R23 or R404 compressor. If the discharge line doesn’t feel hot and the suction line isn’t cold (without any frost), it could indicate a lack of refrigerant in the system.
4. Check the large pressure gauge located behind the test chamber. If the reading is close to "0" or less than "1," it’s a clear sign that the refrigerant has run out. In such cases, it’s advisable to contact the manufacturer for professional assistance in refilling the refrigerant and restoring normal operation.
Note: If the above steps don’t resolve the issue, it’s best to reach out to the manufacturer for further support. Refrigeration systems can be complex, and improper handling might lead to more serious problems.
Always ensure safety precautions are followed during inspections, and avoid attempting repairs unless you have the proper training and tools. Regular maintenance and timely servicing can prevent many of these issues from occurring in the first place.
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