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The refrigeration system is mainly composed of a compressor, a condenser, a throttle valve, and an evaporator, and the leakage point of the refrigerant may also appear in any part of the refrigeration system.
1.Evaporator leak
There are many welds on the left and right sides of the evaporator, and there may be more leaks. The main reason for the leak of the newly installed air conditioner is the poor welding technology of the employees of the air conditioner production factory. Before the copper tube was red (the temperature did not reach 600 ℃ ～ 700 ℃), the electrode was placed at the welding joint. The solder failed to fuse together, resulting in pinch welding, slag, and non-smoothness of the welded joints, leading to leakage of refrigerant.
Operation: Remove the electrical box on the right side of the indoor unit, remove the fixed pipes and clamps on the rear side of the evaporator, and remove the left and right positioning screws of the indoor evaporator. After pulling the evaporator out 5cm, rotate the evaporator 90 degrees with both hands and pull it out along the pipe. After removing the evaporator. Put it on a flat and clean place, and wipe the leak spots with a dry cloth. The leak point is welded with silver solder.
2. Leakage at indoor unit connection
The air conditioner is operating normally, and the indoor unit has no cold air blowing out. Consider whether the refrigeration system is faulty. If oil traces are found at the indoor unit connection, the refrigerant is leaking here.
Operation: Apply with water foam and check whether there is air bubbles blowing out at the connection. If not, you can add refrigerant from the bypass nozzle of the low-pressure gas valve, which is based on the low pressure of 0.5MPa. When the machine was shut down, check the Nazi again. After 3 to 5 minutes, no bubbles were generated, indicating that the air leak at the connection was removed.
3. Leakage of shut-off valve of outdoor unit
The leakage of the shut-off valve core of the outdoor unit mostly occurs after the machine is moved. Because the valve shaft of the switch rotates in and out, and the rubber ring ages, the wear-resistant seal rubber ring wears out, causing the shut-off valve leakage. If the leakage is serious, you can hear a "hissing" sound, and you can release the refrigerant from the low-pressure gas lock of the outdoor unit.
Operation: Use an Allen wrench to unscrew the shut-off valve screw, block the leak with your left hand, and use your right hand to quickly coil the raw material belt around the screw and seal of the screw for 4 turns. Then wrap 2-3 turns of raw material tape on the secondary sealing screw and put on the secondary sealing cap. Add F22 refrigerant from the low-pressure gas cut-off bypass valve filling place, and add F22 gas to about 0.5MPa (for reference).
4. U-shaped pipe leakage of outdoor compressor
The leakage of U-shaped exhaust pipe of outdoor compressor is more common, the main reason is that the thickness of copper pipe is thin and the material is poor. After bending into U-shape, smaller cracks appear. The vibration generated by the compressor during work makes the crack larger. . Most of these leakage failures will leak light from the refrigerant.
5.Capillary vibration and leakage of outdoor unit
The reason for the leakage of the refrigerant may also be the vibration generated when the compressor is working, causing the two tubes to cause resonance friction, leaking the tube walls, and causing the refrigerant to leak light.
6. Leakage of low-pressure bypass spool
Split-type air conditioner refrigeration system replenishes refrigerant (commonly known as "fluoride"), which must be filled from the low-pressure bypass. Use a filling tube with a thimble to push the low-pressure filling valve stem open, and the R22 refrigerant gas in the refrigerant steel cylinder and the refrigerant gas in the air conditioner can be connected, and the filling can be performed.
Cause of failure: The ejector pin of the gas filling pipe is adjusted too long. After ejecting the ejector pin of the bypass valve, it cannot spring back, so that the valve core cannot be reset. The method of elimination is to insert the key of the special air conditioner into the filling valve core, and give a force to the valve core to cause the valve core spring to pop out, thereby eliminating the valve core air leakage fault.
7, compressor terminal leakage
Compressor terminals leak, accounting for more than 2% of the leakage failure. Remove the overcurrent and overheat protector cover. If you see oil marks around the compressor terminals, there are leaks.
Operation: Use C31 double tube glue to prepare at a ratio of 1: 1 and apply it to the wiring. Because the refrigeration system is in a vacuum state, the C31 glue penetrates into the leak point. After the leak point is glued, it is necessary to use a 100W bulb to bake at the glue for 30 minutes to make it easier for the glue to penetrate the leak point. Be careful not to bake the C31 glue too close to the bulb, it is better to be 20cm away from the C31 glue, otherwise the glue will bake and flow around the compressor, which will reduce the plugging effect. Compressor terminals are glued for 2 hours, then they can be pressed and leaked. * Evacuate and add fluoride to the test machine to resume cooling.
8. Piping recess leak
Leakage of the four pipes appeared mostly after home renovation. Some decoration workers do not understand that there is refrigerant in the refrigeration pipeline; if they are bent, they are not easy to find after bending because of the insulation jacket outside the pipeline. After the pipe is recessed, the refrigerant will leak, and even if the fluoride is re-added, the refrigeration system will have two shut-off symptoms.
Operation: Remove the cutoff of the recess with a cutting knife, use the method of butt jointing of the outer tube, after welding with silver welding, press again, check for leaks, evacuate, add fluoride, and start with the remote
Leakage of four-way reversing valve
There are more leaks at the corners of the three copper pipes under the four-way valve of the heating and cooling air conditioner. If oil traces are found at the corners, there are leaks.
Operation: Let go of the refrigerant and wrap the four-way reversing valve with a wet towel for cooling. When welding, you must master the flame technology and align the leak points. When the included angle reaches the welding temperature, quickly spot silver electrode welding.
Source: Refrigeration Network
Jiangsu Jincheng Air Conditioning Engineering Co., Ltd. focuses on:
Industrial air-conditioning, chemical fiber industrial air-conditioning, chemical fiber industrial refrigeration, textile industrial air-conditioning, clean room refrigeration, ventilation ducts, cooling towers, freezers and other air-conditioning units and accessories.
