Overnight, refrigerant leaked light, guess where is the problem After receiving notification from VIP customers, they went to a concrete mixing plant in the suburbs to repair an air conditioner. The machine is a two-hook machine of a certain brand. The outdoor unit is installed in a well-ventilated location without direct sunlight. The indoor unit is installed in the curing room, with harsh environment and high humidity.
Turn on, the external machine starts, the fan compressor runs normally, and the liquid pipe and gas pipe are not responding. The pressure of the gas pipe is negative when connected to a pressure gauge. The typical lack of refrigerant will not increase the pressure after shutdown. Open the three-way valve actually system There is not a little refrigerant in it, so it leaks so much? Connect the refrigerant cylinder, add some refrigerant to the system, check the four large nuts connected, no traces of leakage are found, because the refrigerant in the system is completely leaking light, you need to check the leak, disconnect the outdoor side connection pipe, connect Pressure gauge pressure test. Observe the pressure. After one hour, the pressure gauge did not drop. I thought that there was no refrigerant in the system. There was definitely a leak. Then the pressure was increased to 2.5mpa, and the murderer was revealed. The location is located in the condenser of the external machine. Remove the condenser, suppress the pressure, and soak the water in the experiment. The true murderer is exposed. The leak point is the leak point of the condenser tube at the bottom of the condenser (trachoma) Taking into account the maintenance cost, with the leadership's consent, take the leak repair situation to repair the leak, cut some aluminum fins, find the location, use fiber silver welding to repair the leak, the condenser tube here is very very thin, and the flame temperature must be well controlled , Burning through will increase trouble. After repairing the leak, repress the pressure (2.5mpa) to check the leak, soaking the entire condenser into the water is very intuitive. After finding no leaks, prepare to recover. To vomit, this is still a bit of an exaggeration. Not only is the copper tube and aluminum sheet thinner than paper, but the manifold is actually iron. Restore the machine, evacuate, add refrigerant quantitatively, room temperature 36 degrees, pressure 0.55mpa, the cooling effect is good.
