What should I do if there is a refrigerant leak in a water cooled water chiller?
When using a LC -25°C ~ -5°C Low Temperature Chillers, if there is a serious leakage of refrigerant, it will inevitably lead to equipment shutdown. A low-temperature chiller is a cooling device that can provide constant temperature, constant flow, and constant pressure.
A chiller injects a certain amount of water into the internal water tank of the machine, which is cooled by a refrigeration system. Then, a circulating water pump inside the machine injects the low-temperature frozen water into the equipment that needs to be cooled. The frozen water takes away the heat inside the equipment, and then flows the high-temperature hot water back into the water tank for cooling. A refrigerator is a mechanical device that uses a compressor to change the pressure change of refrigerant gas to achieve low-temperature refrigeration.
The compressor used is different from ordinary air compressors due to its different usage conditions and compression working medium. The working principle of an ice water machine is steam compression refrigeration, which utilizes the principle of absorbing heat when liquid refrigerant vaporizes and releasing heat when steam condenses for refrigeration.
In refrigeration technology, evaporation refers to the process of liquid refrigerant becoming gaseous when it reaches boiling. Due to the comprehensive safety warning equipment of the chiller, in the event of severe refrigerant leakage, the system will automatically stop the operation of the chiller to reduce the probability of damage to other equipment.
Especially for high-power chillers, refrigerant leaks need to be promptly located and dealt with through professional means. Before daily operation of the chiller, it is necessary to carefully test the refrigerant pressure to maintain it within the normal pressure range of the open chiller equipment.
If any refrigerant leakage is found in the chiller, the leakage gap should be promptly sealed, and an appropriate amount of refrigerant should be added to ensure the safe operation of the chiller in the later stage.
The evaporator may have leakage points, mainly due to poor welding technology. When the copper tube is not burned red (the temperature does not reach 600 ℃~700 ℃), the welding rod is placed at the welding junction, and the copper tube and solder are not fused together, resulting in pinched welding, slag, and unevenness at the welding junction. Over time, leakage points may occur.
When the evaporator of the split air-cooled chiller leaks, the unit must be shut down first, and then the chiller manufacturer should be contacted by phone to arrange after-sales service personnel for treatment.
When dealing with refrigerant leakage, the evaporator can be removed and welded, and the disassembly method is:
1. After identifying the missing points, mark them properly;
2. If there is still refrigerant in the refrigeration system, it is necessary to first store the refrigerant;
3. Use two 8-inch or 10-inch wrenches to remove the indoor unit connection lock nut and remove the right electrical box of the indoor unit;
4. Remove the fixed pipes and clamps at the back of the evaporator, and remove the left and right positioning screws of the indoor evaporator;
5. Gently lift the pipeline with your left hand from the back of the indoor unit to move the evaporator forward. After pulling out the evaporator 5cm with your right hand, rotate the evaporator 90 degrees with both hands and pull it out along the pipeline (pay attention to both hands operation, do not touch the fins).
After removing the evaporator from the industrial chiller, place it in a flat and clean place. Use a dry cloth to wipe off the oil stains at the leakage point. The leakage point is welded with silver and checked for leaks. After confirming that there are no leaks, install the evaporator back into the indoor unit in the reverse order of disassembly. Of course, there are many possibilities for refrigerant leakage, not just the evaporator with leakage points, which requires gradual inspection.