In the field of environmental testing, constant temperature and humidity chambers are widely used for simulating various conditions. However, when these devices experience cooling failures, it can be a challenging issue to diagnose and resolve. Today, we will explore common causes and solutions for such problems, providing insights that may help you in your maintenance and troubleshooting efforts.
One of the first things to check is whether the refrigeration compressor starts during operation. If the compressor does start, it usually indicates that the electrical system is functioning properly. This means there's no issue with the power supply or control circuits. However, if the temperature still cannot be maintained, the next step is to examine the refrigeration system itself.
A key indicator is the pressure levels of the low-temperature compressors (typically using R23 refrigerant). If both the discharge and suction pressures are lower than normal, and the suction line isn't frosted, this suggests a refrigerant shortage. You can also perform a tactile test by touching the discharge and suction lines. If the discharge line doesn’t feel hot and the suction line isn’t cold, this further confirms the lack of refrigerant.
Another important factor is the system’s design. Most environmental test chambers have two sets of refrigeration units: a main unit and an auxiliary one. During high cooling demand, both units operate together. However, once the temperature stabilizes, the auxiliary unit typically stops, leaving the main unit to maintain the set point. If the main unit’s R23 refrigerant leaks, it will struggle to maintain the desired temperature. As a result, the temperature may rise slowly, triggering the control system to restart the auxiliary unit, leading to repeated cycles and unstable conditions.
To identify the source of the leak, a combination of a leak detector and soapy water is commonly used. In one case, a small crack was found on the stem of a hot gas bypass solenoid valve. Replacing the faulty component and refilling the refrigerant restored normal operation.
From this example, it's clear that diagnosing refrigeration issues requires a systematic approach. Start by checking external factors, then move to internal components. Begin with the electrical system before investigating the refrigeration cycle. A solid understanding of the device's working principle and operational sequence is essential for effective troubleshooting.
By following these steps and maintaining a thorough knowledge of your equipment, you can quickly identify and resolve issues, ensuring reliable performance of your environmental testing systems. I hope this guide proves helpful for professionals involved in the operation and maintenance of environmental equipment, supporting continued progress in the field of environmental engineering in China.
Electrolyzed Water Machine
Ectrolyzed Water Machine,Electrolyzed Reduced Water Machine,Electrolyzed Reduced Water Kangen,Electrolysed Water Machine
Shenzhen Yibainian Investment Industrial Co., Ltd. , https://www.100hydrogenwater.com