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Air conditioner

NEW COMPRESSOR LIKE PRESSURES

joleon
joleon
2
hace 6 años
hace 6 años
Hello fellow technicians, perform a replacement of a LG compressor of 24 thousand BTUs to a split type equipment, to which the following procedure was performed, condensing unit cleaning, high and low pipe cleaning was performed, replacement was performed capillary and filter, tightness of the welds was tested, the system was emptied and the R22 refrigerant was charged, the equipment started well reaching 40psi of suction and a consumption of 8.6amp up to this stable point, then the progressively increased refrigerant until reaching 45psi the equipment began to vary the pressures ranging from 25 to 45psi and began to freeze the return pipe, then increased the pressure equalizing it with the discharge and the consumption dropped to 5.8amp, it is possible that the compressor is factory defective ? or am I missing something to do? I hope you can help me with this case ... regards ...
NG en linea
NG en linea
9.229
hace 6 años
hace 6 años
Hello, if the running compressor matches the pressures it is not pumping, it may be a factory error or you have made a mistake such as pouring gas in liquid phase
joleon
joleon
2
hace 6 años

Hello friend NG, thank you for your opinion regarding the exposed case the refrigerant was charged in the gas phase ...

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NG en linea
NG en linea
9.229
hace 6 años

Okay. So I don't see any other option that compressor does not pump is having the same effect as compressor off, at which time the pressures equalize

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joleon
joleon
2
hace 6 años

Correct NG online, the compressor will be taken to the store where they bought it for review by the seller, I will be informing ... greetings

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friovega63
friovega63
11.849
hace 6 años
hace 6 años
Hello joleon, there is the possibility for what you say, that the system has been passed from coolant, and the freezing of the pump inlet to the compressor, which is a pipe elbow that carries under the liquid trap of the compressor itself, which It is that kind of bottle that the compressor carries on its side, I repeat that when that pump inlet freezes, the compressor pump itself stops sucking coolant for that reason and the pressures automatically rise to equalize. I do not think that the compressor has stopped compressing, because the low pressure would never fluctuate, that is, it does not increase and decrease the pressures, but they equalize and point, a new compressor compresses or not, because it has no mechanical wear. To resolve the conflict, you should gradually withdraw the amount of refrigerant from the system until the compressor is able to lower them through the low pressure zone and at the same time, the pressures begin to stabilize, observe that point of the elbow below the liquid trap of the compressor itself, so you can see if it is freezer. Bone does freeze or moisten that point of the elbow attached to the compressor. If you turn off the equipment for about 10 minutes, until the elbow is defrosted, when the compressor starts again, you will see that initially it does start to lower the pressures until the elbow is frozen again. This phenomenon happens contrary to what happens when the maya of the liquid trap filter is frozen, which in that case the suction pressure goes to vacuum and does not equalize. Chemically pure refrigerant such as R22 must always be charged up to 75% in liquid form with the compressor off and then filled with steam with the compressor running, to avoid damaging it. If a diffuser valve is available, the refrigerant can be applied completely in a liquid state, but always at its discretion. The exact amount of refrigerant for a system is also known, it can be added completely in a liquid state by measuring that weight through a balance, with the unit fully at rest. Check everything and comment please. Luck. S @ lu2 friovega63.
NG en linea
NG en linea
9.229
hace 6 años

Hi Friovega. And in that case when the suction was sealed, the high pressure would not rise until thermal firing?

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friovega63
friovega63
11.849
hace 6 años

Hello my dear colleague NG, I have not had that experience that the protection will come to fire, but something like this will probably never happen, because the consumption of the compressor rather what it does is lower, when the high and low pressures are equalized, contrary to what one might think, I imagine that at that moment there is no load acting on the pump of the compressor itself. It is a phenomenon that only, I have seen in rotary type compressors. A S @ lu2 from our Cubita la bella, for our northern neighbors. friovega63.

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joleon
joleon
2
hace 6 años

Hi Friovega63, thanks for your opinion, I will take into account what you recommend, effectively when the pressures equalize the low consumption, but nevertheless the low spout defrosts and the pressures did not return to normalize were equalized, the rare thing that did not reach the load full of refrigerant since he should have a FLA 11 amp consumption with 1290gr of R22, I will be warning you taking into account your recommendations greetings .....

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joleon
joleon
2
hace 6 años
hace 6 años
Hello fellow technicians, thank you in advance for your opinions regarding the aforementioned case, indeed the factory defective compressor came, it was replaced by another one and the team was working in perfect condition thankful for your attention many garcías ... greetings.
NG en linea
NG en linea
9.229
hace 6 años

Hello friend Friovega (when you can go to whatsapp). When I said that the discharge should go up, I meant that if there was such a tupition, the discharge pressure could have risen in such a way that it triggered the thermal protector or due to its damage it did not cut and the compressor would collapse at a time when the technician was not checking the equipment
That is why I also asked him if he had not thrown the gas in liquid phase. Issue that happened to a friend with 24,000 btu that since it has 2 access valves, high and low was confused and began to take down the r22 in liquid phase and remained

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friovega63
friovega63
11.849
hace 6 años

Hello joleon, thanks to you for the communication, I am glad that you have already solved your problem with the equipment. S @ lu2 friovega63. For me, dear colleague NG, I want to congratulate you, because this time it was your turn to accept the accepted solution, which I hope Mr. Joleon will take into account to close this question with a flourish. On the other hand I understood his point of view regarding the pressures, and I recognize that if the high rises too high, it can trigger the thermal protection, but it happens that if the low pressure rises too much as in this case, the pump leaves of suffering the overload

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