【 Weak current College 】 Central air-conditioning refrigeration oil usage considerations

1. refrigeration system of lubricant management
1. refrigeration system lubricants should be periodic sampling for laboratory analysis or the colour phase-contrast check, find oil change, you want to find the reasons, and in a timely manner according to the requirements of the processing;
2. refrigeration system the best in each of the lubricating oil all over time, replace the front with a new oil will remain in the system of the old oil all wash;
3, oil change, you should try to drain the oil cooler inch oil. Response to oil and gas recovery unit of precipitation accumulation and rust completely clear, and on oil and oil filter for removing check guarantee replacement lubricating oil clean and pure, digital workflow software unimpeded;
4. does the refrigeration system in the original oil and mix the new oil, which breaking new oil each performance index, affect the life of the unit;
5. replace the new oil brands vary, you should clean the system carefully, otherwise it is difficult to get good results. It is best not to easily change the units used in the refrigeration oil grade;
6, unit outages, as long as the lubricants and refrigerants coexistence scenarios, you should make the oil heater power, temperature control of the scope of the provisions;
7, in winter, the inspection system is not compromised, the refrigerant and oil in the system for the winter, centrifugal chillers (especially R11 centrifugal chillers) should keep electric heater is powered on, ensure that the oil temperature stability in the provision, and the screw and reciprocating chillers can not oil heater power, but the former 12h ~ 24h must start on oil for heating;
8. Prohibition of the use of oil in place of refrigeration oil, engine oil performance is not suitable for low temperature conditions, forced to use easy to damage the unit.

II. identification of lubricant quality changes
As a result of lubricating oil in the refrigeration system in the long term, to withstand various thermal process temperature, the pressure change and refrigerants, water and other substances (such as Non-Condensable gases, seals, organic insulating materials, metal parts, etc.) the quality of interactions, easy to change the oil in a suspended organic acids, polymers, and corrosion products such as metal block, resulting in a decline in the oil surface tension, corrosive enhancements, performance deterioration. Performance transparency for oil, color variation by micro-red becomes reddish-brown. Appears above the new oil must be replaced.
In analysis laboratory capacity, according to the lubricant manufacturers provide oil deterioration judgment check project and parameter values on the use of lubricants for inspection analysis and comparison, where more than index standard should immediately replace the new oil. Since the oil contains, acid or other substances, most of the deposition in oil storage installation (crankcase or tank) at the bottom, so the laboratory analysis of samples should be sampled from the bottom of the storage device.
According to the determination of oil parameters to determine whether to change the oil less convenient, but also analysis laboratory program complex, the vast majority of units units do not have such a means of examination of, and often generating factories under the experience to develop unit oil change. General recommended year-round air conditioning unit, you should change the oil every year. But this approach has a strong experience in judging the nature, quality lubricating oil in correctly reflect the larger error.
A Visual and scientific judgment, easy oil is oil in use color from yellow gradually becomes a reddish-brown, oily gradually by good bad characteristics, producing oil in different quality of the colour spectrum of situations. The Atlas is divided into yellow, Orange, yellow, red, red, Crimson, red, the colour phase soils. Checks, as long as the sampling and mapping phase control on color, like oil and Atlas in which phase of the closest color, then the phase of oil quality grade is the grade of oil quality sampling.

3. Lube storage management
1, lubricants must be stored in a clean, sealed container, the container should indicate the names and brands of oil, and classification;
2, oil containers must be kept in a clean, dry, cool, ventilated room;
3, oil-to-use tools and containers should be kept clean, moisture; different brands of oil in the oil distribution tools should not be used interchangeably, must be used interchangeably, originally used or contaminated oil cleaning with gasoline, dry before for other brands of oil;





Central air-conditioning refrigerant usage considerations
Refrigerants in non-injected front mounted cooling device is the use of steel bottle of refrigerant cylinders, belong to liquefied gas pressure vessel and, therefore, to ensure that the cylinder is fitted with a refrigerant in the use and storage of security, must strictly abide by labor enacted: ' pressure vessel safe supervision regulations ' and ' gas bottles safe supervision regulations ".

1 cylinder requirements
1. open and close cylinder valves should be standing on the side of the slow on-off valve;
2. cylinder valve freezing, the cylinder to move to a warm place, or the use of clean lukewarm water to thaw, is strictly prohibited the use of fire-curing;
3. from the cylinder to the refrigeration unit filled with the refrigerant, they must go through vacuum unit;
4 bottles of gas shall not be exhausted, must have a certain amount of residual stress;
5, use to prevent vertical bottle fell, prohibition of percussion and collision.

Second, to the cylinder filling refrigerant requirements
Refrigeration equipment for refrigerant emissions of non-fault, should generally be discharged into the refrigerant cylinders, this can be left after filling in the refrigeration plant use, avoid wasting; on the other hand, it also prevents discharged into the atmosphere to pollute the environment.
1, used for filling of cylinders in addition to color, logo, etc. to and intended to be in line for filling of refrigerants, also called the safe and effective use period, the appearance shall not be defective, the safety valve parts must be in good condition;
2. the amount of refrigerant filling may not exceed the specified value; cylinders
3. filling the weighing scales must be accurate, but the maximum weighting range should be used in weighing the value of 1.5 ~ 3 times;
4. fill filling recorded and attached to a cylinder, the main contents include: filling time, filling volume, filling-like, steel cylindersNumber, etc.

Third, the refrigerant storage requirements
1, with cylinder storage refrigerant room by the banning of the open fire or heating devices, and natural ventilation should be good or mechanical ventilation installations are set;
2. cylinder vertical drop should tighten the bottle cap, and place the orderly; lying on the head should be in the same direction, stacked in less than five layers and properly fixed to prevent scrolling.