The low temperature test chamber is a commonly used equipment, and its application range is wide. What problems should be paid attention to during the inspection or maintenance of the low temperature test chamber? How to deal with it? The following is a small introduction to introduce you:
1. Excessive refrigerant charge
When charging the refrigerant, it is most difficult to charge too much. Because the filling amount is too much, it is easy to produce “liquid blow†and damage the refrigeration equipment. At the same time, it is impossible to calculate the emission. For those who lack maintenance experience, it is very easy to cause emissions. Excessive, wasted refrigerant. At the same time, excessive charging of the refrigerant will cause a decrease in the condensation area and affect the refrigeration coefficient.
Countermeasure: When charging refrigerant, master the principle of “never more than enoughâ€, generally fill 80% of the required amount, and when it is missing, it can be added again, so that the amount of charge can be counted, which is convenient for judging the fault.
2. Smoking when charging refrigerant
When charging refrigerant, it is most difficult to smoke, because during the filling process, Freon needs to squeeze out the air in the fluorine-filled tube. At this time, Freon leaks out with the air. When the Freon in the air encounters a high-temperature burning of cigarette smoke, it produces "phosgene". At this time, smoking is extremely easy to inhale into the lungs and cause chronic poisoning.
Countermeasures: Smoking is strictly prohibited when charging refrigerant.
3, the refrigeration system is not completely vacuumed
The refrigeration system is most taboo, the vacuum is not thorough, because the air contains moisture, which is easy to cause the system to block the ice. At the same time, the moisture and Freon easily decompose the corrosion system such as hydrochloric acid, hydrofluoric acid and carbon dioxide, causing the motor enameled wire to fall off and burn the motor. Copper plating occurs, which affects the service life of the compressor.
Countermeasures: Thoroughly evacuate 700mmHg or more or take a second evacuation.
4, lubricating oil mixing, refrigerant mixing
It is most difficult to mix two different lubricating oils, two different refrigerants are mixed, because the mixing of two different types of lubricating oils is easy to deteriorate, and the mixing of two different refrigerants is prone to changes in thermal parameters such as temperature, pressure, specific volume,ç„“, entropy, etc.
Countermeasure: Cannot be mixed.
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