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  • Air conditioning and ventilation /

    About repairing air conditioners

    About repairing air conditioners The situation when the need to replace the failed air conditioner compressor, in most cases linked to negligence or improper installation and operation of the air conditioner. Very often the service department even detect a darkening insulation, oil conditioner, or refrigerant leak is limited, at best, install a filter on the liquid pipe or eliminating leaks and refueling air conditioning, while the need radical measures to rescue the compressor, which can not hold on-site air conditioning. The result of such an attitude is always the same - failure of the compressor. I would like to share the experience of repairing of air conditioners in such situations where the air conditioning compressor can still be saved.

    The need for repair compressor - condensing unit air conditioner in the workshop arises not only in an emergency, such as failure of the compressor, but also on the results of routine inspection conditioner.

    Such situations may arise in the following cases:

    1. As a result of rapid analysis of compressor oil.
    2. With the loss of the air conditioner refrigerant circuit tightness.
    3. If moisture gets into the air conditioner refrigerant circuit.

    In these cases, even if the air conditioning compressor is still running, his days are numbered. Emergency Resuscitation help extend life air conditioning.

    Express oil analysis.

    Under these beautiful words hides fairly simple steps:

    1. It is necessary to obtain a sample (sampling) refrigerant oil from the refrigerant circuit.
    2. Compare its color and smell to the existing model of good oil.
    3. With having an acid test to test for the presence of oil in it acid.

    How to take an oil sample for analysis?

    It is known that the oil circulates with the refrigerant of the refrigerant circuit in the air conditioner. When the air conditioner is stopped, the oil contained in the walls of the pipeline runs them down. That's oil, and you can take a sample of the air conditioner through the service port.

    You will need:

    1. Ball valve with nazhimkoy 1/4 ".
    2. A short hose from the nipple 1/4 ", (quite suitable hose from the manifold valve).
    3. The capacity to collect oil.
    4. Clean test tubes.

    The procedure is:

    1. Stop the air conditioner, for 10-15 minutes to give the oil to drain on the walls of the pipeline.
    2. Connect to the service port ball valve.
    3. Connect the hose to the ball valve. The free end of the slag place in a container to collect the oil.
    4. Open the valve. The effluent gas from the hose will make butter. We can only collect it in a container. A little exercise, a few extra oil stains on your clothing, gloves and had to take an oil sample is not a problem for you.
    5. Allow the oil to settle (because the oil contains dissolved refrigerant - it foams).
    6. Pour the sample into the tube.

    The next step rapid analysis - a comparison of the oil sample from the available sample in color and smell. To this same quantity of oil from the sample and placed in an oil exemplary two identical tubes and compared to each other.

    • dark color and the smell of burning oil indicates that the air-conditioning compressor overheating. The cause of overheating could be a refrigerant leak from the air conditioner or air conditioner in the operation mode < Heat > at low negative temperatures. The oil thus loses its lubricating properties. As a result of the decomposition of oil on the walls of the piping and internal parts may be deposited conditioner resinous substance, which subsequently can cause failure of the air conditioning compressor.
    • greenish tinge oil indicates the presence of a copper salt. The root cause - the moisture in the circuit. Quiz acidity of the oil is usually also polozhitelnyy.prozrachnoe oil with a slight odor is not much different from the color of the sample indicates that the resuscitation air conditioning is not needed.

    Finally, the acid test of a completely dispel our fears, if the sample is a little different from the sample or confirm the need for emergency intervention.

    If it appears that the oil is good, and the air conditioning compressor is operating normally need to come back to take on the oil sample in air conditioning.

    The sequence of actions with the following:

    1. It is necessary to find a suitable dish. It is best suited transparent tall glass with a diameter of 3-4 cm.
    2. To connect the service port ball valve with a hose, as well as the capture of the oil sample.
    3. Lower the free end of the hose into the glass.
    4. Pour into a glass is the amount of oil so that it covered the hose connection.
    5. Mark on the glass the oil level.
    6. For a short time to lift the ball valve to displace air from Freon hose.
    7. Pour into a glass of the same amount of oil, which was taken at the trial.
    8. Turn on the air conditioner on < cold >.
    9. Close liquid port of the air conditioner.
    10. When the pressure in the suction line falls below atmospheric open valve and the oil gets through the service port in the air conditioning.
    11. Close the valve when the oil level reaches the mark.
    12. Turn off the air conditioner.
    13. Open the liquid port of the air conditioner.

    The loss of tightness of the refrigerant circuit can be caused by various reasons and does not always lead to disastrous results. It has a value of location of the leak, the amount of refrigerant that managed to escape interval of time between the occurrence and detection of leaks, operation mode and other factors.

    The risk of refrigerant leakage?

    1. The conditioner compressor, cooled refrigerant by reducing the density of the latter overheated.
    2. Compressor discharge temperature rises, the hot gas can damage the four-way valve.
    3. Violated the compressor lubrication oil is carried away in a capacitor.
    4. Through the hole inside the air conditioner may get to air containing moisture.

    Symptoms associated leakage:

    1. Darkening of the thermal insulation of the compressor.
    2. Periodic operation of thermal protection of the compressor.
    3. Burning insulation on the discharge line.
    4. Oil dark color with a smell of burning.
    5. Often positive test oil acidity.

    If a leak is detected in time, the refrigerant is not completely gone, the air conditioning worked without any refrigerant is not long, there are no accompanying symptoms - conditioner repair in the workshop is not required.

    The proportion of sudden, catastrophic leaks caused by the destruction of pipelines is very small leaks frequently occur through small leaks in the joints of rolling, and if you constantly monitor the work of the air conditioner, the leakage can be detected in a timely manner.

    What should pay attention to:

    1. No more than 5 minutes after the air conditioner, depending on the mode selected must provide cold or warm air. If not you should immediately turn off the air conditioner and call the repairman.
    2. If the air conditioner pipe on the outdoor unit are covered with frost - there is a leak, you need a master.

    These basic rules will avoid the high cost of repairing air conditioning.

    Moisture in the refrigerant circuit is most often in violation of the rules of the air conditioning installation. One of the stages of installation - Frenova vacuum line is aimed not only complicate the life of the installer, and remove from the trunk-mounted air and water vapor. Such substitutes of this procedure as a purge line mounted refrigerant can not remove the moisture, and only turns it into ice at the walls of copper tubes, which then melts into water and making their < black > business.


    About repairing air conditioners


    Risk of moisture inside the air conditioner is that it often does not manifest itself until the failure of the air conditioning compressor. The fact that all processes in the air conditioner is running in the mode cold occur at temperatures above zero and the water manifests itself only when frozen, causing a disruption of the capillary tube or expansion valve. However, circumstantial evidence to determine the presence of moisture in the air conditioner, you can:

    • On one of the signs of the presence of moisture in the refrigerant circuit it was already under way; Oil is a greenish tint and a positive test for acidity. It should be noted that this is the state of the air conditioner predinfarktnoe and require urgent intervention.
    • In the earlier stages of the moisture it manifests itself at low temperatures, evaporation, such as the air conditioner in the < Heat > at low outdoor temperature or a refrigerant leak. At the same time the moisture turns to ice and clog the capillary tube or nozzle to TRV. The result - the suction pressure of the air conditioner falls, increasing the temperature of the compressor is activated thermal protection. This cycle is repeated as long as the compressor will not burn.

    Removing moisture from the refrigerant circuit and it can only be done in the studio.

    What checks and how often you need to perform to detect the disease in time to the air conditioner?

    1. Check the air conditioner every time you turn. About her above. After about 5 minutes of operation check whether the air conditioner gives cold or heat (depending on mode). If you can see the cranes of the outdoor unit to see if there is frost on them. If the results are negative need to turn off the air conditioner and call the master.

    2. A sample of oil needed in the following cases:

    • For air conditioners, taken at the service, during the audit of the technical state of the air conditioner.
    • For equipment that operates in the winter but it does not serve.
    • When you call to repair the air conditioner is not located on the service.
    • If there is a leak of refrigerant from the air conditioner.
    • In any other suspicious cases.

    Oil - the blood of the compressor and for the inquisitive wizard tells a lot about < diseases > air conditioning.

    What is the same is the procedure of < Resuscitation > air conditioning in the studio, and so she need?

    It is known, for example, that there are various methods of cleaning the air conditioner refrigerant circuit based on the use of filters that are installed in the gap of the refrigerant circuit and collect the pollutants.

    Why not use such methods? Why do I need to make sure they work in the studio?

    The fact that the situation described above occurs primarily oil contamination of the compressor or a change in its properties. Techniques based on the use of filters in this case unfortunately ineffective.

    No filters which are able to restore the lubricating properties of the oil subjected to thermal decomposition, removing moisture which is submerged in the compressor the oil using filters also extremely effective. So the only way to clean the compressor oil - replace it. This procedure can be performed only after the dismantling of the compressor and therefore only possible in a well-equipped workshop.

    At the same time, the following measures:

    1. Evacuation of the refrigerant compressor dismantling.
    2. The release of oil from the compressor, the compressor wash.
    3. Evacuate the compressor.
    4. Filling the compressor oil, compressor test.
    5. Flushing input circuit condensing unit.
    6. Removing the filter drier, filter installation process.
    7. Installation of the compressor in the condensing unit.
    8. Installing condensing side to stand.
    9. Refrigerant charge.
    10. Flushing of compressor, condenser Bolok on the stand.
    11. Evacuation of refrigerant.
    12. Replace the filter drier in the process working.
    13. Evacuation condensing unit.
    14. Refrigerant charge, a test run of the repaired unit.

    As the contaminated oil is distributed over all the elements of the air conditioner of the activities for cleaning the refrigerant circuit must be carried out on the site of the air conditioner. The aim of these measures to prevent the ingress of dirty oil into the refurbished unit.

    These include:

    1. Purging freon highways and evaporator with dry nitrogen.
    2. Installing the filter in the process of freon pipe.
    3. Evacuation freon line and evaporator.
    4. Start the air conditioner in the job for the collection of dirt on the filter.
    5. The condensation of the refrigerant in the condensing unit.
    6. Removing the filter process.
    7. Evacuation freon line.
    8. Start the air conditioner at work (test run).
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