Specification for Filling and Selection of Compressor Refrigerant Oil | Key Points for Matching Refrigerant, Operating Conditions, and Viscosity Grades
The compressor refrigeration oil model must correspond one-to-one with the refrigerant. POE ester oil is suitable for R404A, R507, R23, while mineral oil is only suitable for some older R22 models and cannot be cross mixed.
The deviation of the filling amount directly affects the service life of the unit. If the filling exceeds the nameplate standard by 10%, the oil accumulation and heat exchange of the evaporator will decrease by 22%; If the oil level is below the lower limit of 15%, insufficient lubrication of the bearings can easily cause cylinder pulling.
The nameplate of the Xitelidou semi closed piston compressor indicates the amount of refrigerant oil to be added. For small four cylinder models, the standard amount is 2.2-2.8L, while for medium four cylinder models, it is 3.5-4.5L, which can be used as a reference for initial installation.
Low pour point refrigeration oil is preferred for cryogenic two-stage compressors, with a pour point below -70 ℃. It maintains fluidity under -60 ℃ evaporation conditions and will not freeze and stop oil in low-pressure pipelines.
The aging judgment index of refrigeration oil is based on the acid value. If the acid value exceeds 0.1mgKOH/g, the oil will become corrosive and corrode the insulation of the motor and the surface coating of the valve plate. It needs to be replaced immediately.
The amount of refrigeration oil added to the compressor cannot be judged by experience or visual inspection. After stopping the machine and letting it stand for 30 minutes, the oil level observation mirror should be at the standard level in the range of 1/2~2/3. A slight drop in oil level after operation is a normal phenomenon.
Under high-temperature heat pump conditions, the oxidation rate of frozen oil is faster, and the replacement cycle is shortened to 3500 hours. Under low-temperature conditions in ordinary cold storage, the replacement cycle of qualified oil products can reach 6000-8000 hours.
Many maintenance technicians do not replace the oil filter synchronously when changing the oil, resulting in residual acidic impurities in the old filter element. After adding new oil, it will be quickly contaminated, shortening the service life of the oil.
Export foreign trade orders require corresponding refrigerant refrigeration oil data. R23 cryogenic unit refrigeration oil is a niche category, and it is difficult to purchase locally overseas. It is recommended to randomly provide spare parts packages.
It is not recommended to mix different brands of frozen oil with the same viscosity. There are differences in additive formulas, which may result in sludge precipitation and blockage of capillary and expansion valve microchannels after mixing.
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FAQ
1. Which mainstream refrigerants are suitable for POE refrigeration oil? Suitable for commonly used refrigerants such as R404A, R507, R23, etc.
What is the upper limit of deviation for refrigerant oil filling? The filling amount shall not exceed 10% of the nameplate standard.
What is the required value of frozen oleic acid to be replaced? If the acid value is greater than 0.1mgKOH/g, it is recommended to change the oil.
4. Where is the standard oil level located on the observation glass? After settling, the oil level is in the range of 1/2 to 2/3.
5. What is the minimum requirement for the pour point of cryogenic oil? The pour point under the condition of minus 60 ℃ should be lower than -70 ℃.
6. Is it necessary to change the oil filter simultaneously when changing the refrigeration oil? Suggest synchronous replacement to avoid impurities contaminating the new oil.
Can different brands of frozen oil with the same viscosity be mixed? It is not recommended to mix, as it can easily produce sludge.
