How to replace the frozen oil central air conditioning?

each moving parts in the refrigeration oil used in refrigeration compressor lubrication oil, known as frozen oil, also known as lubricating oil. The central air conditioning unit compressor refrigeration oil need to change once a year? Frozen oil change steps have? Now please follow to find out together!

a, the action of the compressor refrigeration oil

1, the lubrication

it lubricates the compressor motor parts surface, reduce the resistance and friction, reducing power consumption and prolong the service life.

2, cooling

it can take sports surface friction heat in time, prevent the compressor temperature is too high or the compressor burned.

3, sealing function

lubricating oil into the friction piece of sealing surface and form oil seal, prevent leakage of refrigerant.

4, to reduce the compressor noise

oil flushing friction surface, constantly take abrasive dust, can reduce the friction wear.

2, what circumstances need to replace special frozen oil

central air conditioning whether need to replace the frozen oil, is set according to the index, basically has the following indicators:

1, PH indicators

when the PH of the lubricating oil in 6 below, you need to consider replacing frozen oil, because oil acidification, corrosion of equipment, directly affecting the service life of the compressor motor, advise you to regularly test the PH of the frozen oil, if can't check it should be replaced periodically system of dry filters, keep dry degree system under normal condition.

2, pollution index

if detected, per 100 ml of frozen oil pollutants in more than 5 mg, is recommended to replace them.

3, water content

if water content of frozen oil more than 100 PPM, frozen oil needs to be replaced.

3, replace the frozen oil operation specification

1, close the high-pressure exhaust and low pressure suction stop valve, needle valve by pressure on the process release the compressor internal refrigerant, make the shrink machine crankcase and atmosphere are interlinked

2, unscrew the crankcase pan drain plug, frozen in the crankcase oil put the net clean and remove the filter.

3, available nitrogen from the low pressure gas charging valve needle blow in, with his hand to block oil drain mouth increases the pressure in the body and further eliminate residual oil inside the body, to clean the filter after the dry into the body and screw down the drain plug.

4, refrigeration compressor of frozen oil requirements

because of different occasions and refrigerants, refrigeration equipment choice of frozen oil is different also. Demand for frozen oil has the following several aspects:

1, frozen oil viscosity oil viscosity characteristics of an important parameter, using different refrigerants to choose corresponding different freezing oil. If the frozen oil viscosity is too large, can make the mechanical friction power, the friction heat and increase starting torque. On the other hand, if the viscosity is too small, will not needed for the formation of oil film between the moving parts, which can not meet the lubrication and cooling effect.

2, cloud point cloud point refers to the temperature of the frozen oil decreased to a certain value, began to precipitation of paraffin in the frozen oil, make the temperature of the lubricating oil becomes cloudy. Refrigeration equipment used, the cloud point of frozen oil should be lower than the refrigerant evaporation temperature, otherwise it will cause throttle valve block or affect the heat transfer performance.

3, freezing point refrigeration oil under the experimental conditions to stop the flow of cooling temperature is called the freezing point. Refrigeration equipment used in the refrigeration oil freezing point should be lower, the better ( Such as R22 compressor, refrigeration oil should be - Below 55 ℃) , otherwise, it will affect the flow of refrigerant, increase the flow resistance, resulting in the consequences of poor heat transfer effect.

4, flash flash frozen oil refers to oil steam heated to it occur when in contact with the flame lighter most your temperature. Refrigeration equipment used in the refrigeration oil flash point must be higher than the exhaust temperature of 15 ~ 30 ℃ above, lest cause burning and coking of lubricating oil.

5, and other such as chemical stability and resistance to oxygen, water and mechanical impurities and insulation performance.

the above is the 'how to replace central air conditioning refrigeration oil' are all of the content, I hope you after watching the 'how to replace central air conditioning freezing oil' have a certain understanding, if you also want to know more knowledge of frozen oil, can click on online consulting or call our company's website to learn more.

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