Judgment steps for refrigerant leakage in air-conditioning system

　　【】The first step:

　　 Shut down and unplug the air conditioner (to prevent danger during the inspection process), and connect a pressure gauge to the large valve. Observe the static pressure.

　　① 0-0.5MPa, no fluorine failure, at this time, gaseous refrigerant should be added to the system to make the static pressure reach 0.6MPa for leak detection.

　　②If the pressure is above 0.6MPa, if there is a fluorine deficiency failure, the leak can be directly detected at this time.

　　 Step 2:

　　 R22 and the compressor lubricant are mutually soluble, so when the R22 system leaks, the lubricant will be taken out, which means that there is oil in the refrigeration system The location of the traces should be focused on inspection.

　　The third step:

　　Key points to check for fluorine leakage failure:

　　①New installation (or relocation): indoor unit and outdoor unit The 4 joints of the connecting pipe, the nut of the big and small valve, and the welding part of the extension pipe.

　　②The air conditioner in normal use suddenly does not cool: compressor suction pipe and exhaust pipe, system pipe welding point, capillary tube, four-way valve connecting pipe and root.

　　③The fluorine deficiency failure: the indoor unit and the outdoor unit are connected to the 4 joints of the pipeline. The air conditioner that has replaced system components or repaired pipes should also check the solder joints.

　　④The position in the system with oil traces.

　　Fourth step:

　　Leak detection method: soak the towel (or sponge) with water. It is advisable not to drip downwards. Pour the detergent, Knead gently until it is rich in foam, and apply it to the area to be inspected, and observe whether it is bubbling outwards. The bubbling indicates that there is a fluorine leakage fault in the inspected part, and the absence of bubbling indicates that the inspected part is normal.

　　Fifth step:

　　Leak point treatment method

　　①System solder joint leakage: repair the solder leakage point.

　　②The root of the four-way valve is leaking: replace the four-way valve.

　　③The bell mouth tube wall becomes thin or falls off: re-flare.

　　④The joint nut is not tightened: tighten the joint nut.

　　⑤The thread of the valve or the quick connector of the indoor unit is damaged: replace the valve or the quick connector.

　　⑥ The joint nut is cracked or the thread is damaged: replace the connecting nut.

　　Step 6:

　　Micro-leakage troubleshooting method:

　　 Refrigeration system micro-leakage failure, if the leakage point is too small or relatively hidden, use the above method When the leaks are not checked, the following steps can be used to check.

　　①Distinguish the fault location: When the system is at equilibrium pressure, connect the pressure gauge and record the system pressure value at this time and then remove it, close the valve cores of the large and small valves, and connect the system of the indoor unit and the outdoor unit Keep pressure separately.

　　 after waiting for a period of time (decided by the size of the leak), then connect the pressure gauge, slowly open the large valve spool, and check whether the pressure gauge needle is rising or falling: if it is rising, it means that the outdoor unit is If the pressure is higher than the indoor unit, the fault lies in the indoor unit. Focus on checking the evaporator and connecting pipes; if it drops, it means that the pressure of the indoor unit is higher than the outdoor unit, and the fault lies in the outdoor unit. Focus on checking the condenser and the pipes in the outdoor unit.

　　②Increase the leak detection pressure: Since the static pressure of fluorine is up to about 1MPa, the system pressure should be increased to check the faulty parts with small leaks. If conditions are met, nitrogen can be used. The nitrogen bottle is directly charged into the refrigeration system of the air conditioner through the connecting pipe and the pressure gauge, and the static pressure can reach 2MPa.

　　 Hazard reminder: Excessively high-pressure oxygen will ignite spontaneously when encountering the refrigerant oil of the compressor and cause the compressor to explode. Therefore, it is strictly forbidden to flush oxygen into the refrigeration system for leak detection, remember!

　　③Put the refrigeration system into the water: If the leak cannot be detected after distinguishing the fault location and increasing the leak detection pressure, you can put the suspected system part (such as the evaporator or condenser) into the clean water Among them, look for leaks by observing the bubbles that pop up.