How to determine the refrigerant leakage of the air conditioning system Only need these six steps

How to determine the refrigerant leakage of the air conditioning system Only need these six steps

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 fault, at this time, gaseous refrigerant should be added to the system to make the static pressure reach 0.6MPa for leak detection.

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

　　 Second step:

　　 R22 and compressor lubricating oil are mutually soluble, so when the R22 system leaks, the lubricating oil will be taken out, that is to say, the parts of the refrigeration system with oil stains should be checked.

third step:

　　Key inspection locations for fluorine leakage failure:

　　①New installation (or relocation): 4 joints of the connecting pipes of the indoor and outdoor units, the nut of the large and small valves, and the welding part of the extended pipeline.

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

　　③Gradually lack of fluorine fault: 4 joints of indoor and outdoor unit connecting pipes. The air conditioner that has replaced system components or repaired pipes should also check the solder joints.

　　④ Locations with oil stains in the system.

the fourth step:

Leak detection method: soak the towel (or sponge) with water. It is advisable not to drip downwards. Pour detergent, knead gently to make a rich foam, apply it to the part to be checked, and observe whether it is bubbling or bubbling. It means that there is a fluorine leakage fault at the inspection site, and no bubbling indicates that the inspection site is normal.

the fifth step:

　　Leak point processing method

　　① System solder joint leakage: repair solder joint leakage.

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

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

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

　　⑤ Thread damage of large and small valves or quick connectors of indoor unit: replace large and small valves or quick connectors.

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

　　 The sixth step:

　　 Micro-leakage troubleshooting method:

　　 The refrigeration system has a slight leakage failure. If the leakage point is too small or concealed, and the leakage point is not checked using the above method, 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, then remove it, close the valve cores of the large and small valves, and separate the indoor and outdoor systems to maintain pressure.

After waiting for a period of time (according to the size of the leak), connect the pressure gauge, slowly open the large valve spool, and check whether the gauge needle of the pressure gauge rises or falls: If it rises, it means that the pressure of the outdoor unit is higher than that of the indoor unit, and it is malfunctioning. In the indoor unit, focus on checking the evaporator and connecting pipes; if it is down, the pressure of the indoor unit is higher than that of 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 leak points. 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: Oxygen with too high pressure will ignite spontaneously when it encounters 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, put the suspected system part (such as the evaporator or condenser) into the clean water and observe the leak Bubble to find the leak.