R404a alternative refrigerant R22 refrigerant issue to consider

in our show life, no matter what products to use in place of another product, all have a problem in the inside, refrigerant is not exceptional also, today small make up to you to introduce r404a alternative refrigerant R22 refrigerant issue to consider, want to know friends following the introduction of small make up take a look at the following related articles.

1, the use of alternative refrigerant R22 refrigerant R404a big issue is lubricating oil, used to form a complete set of PVE ester oil to replace R22 with mineral oil. Ester lubricant and high affinity for water and water is poor, it should be used in the try to avoid contact with outside air, container after opening, should use as soon as possible, after use shall be kept sealed; Away from the oxidant, strong alkali, strong acid, save in ventilated place; When using, should avoid contact with skin and eyes, avoid inhaling its steam and spray.

2, the exhaust pressure of refrigerant R404a is about 1 of R22. 2 times, mass flow rate is 1 of R22. 5 times or so, increased exhaust velocity, resistance. Condenser, in general, the change of heat capacity than R22 larger 20% ~ 30%.

3, the same temperature and R22 as refrigerant R404a saturation pressure is different, so the thermal expansion valve action mechanism and R22 as refrigerant R404a. As refrigerant R404a and lubricating oil on sealing material intermiscibility, expansion valve sealing material also should accordingly change, therefore, on the choice of thermal expansion valve should choose R404a dedicated expansion valve.

4, the same compressor, the use of current than R22 as refrigerant R404a, so the compressor ac contactor, thermal relay, and cable wire diameter to adjust. In the aspect of system protection, high pressure switch Settings from 2. 45 mpa is adjusted for 2. 7MPa。

5, due to the saturation pressure of refrigerant R404a and R22 is different, so the air tightness test pressure than R22. System at the same time the vacuum degree should be higher than that of R22, moisture content is lower than R22. To with liquid refrigerant filling type filling, in case of R404A configuration changes.

6, R404a refrigerants are azeotropic mixed working medium, non azeotropic mixture composition concentration changes with the temperature, pressure, the production of refrigeration system, debugging and maintenance has brought certain difficulties, the heat transfer performance of the system is also can produce certain effect, especially when the refrigerant leakage, all system refrigerant needs emptying displacement, so as to guarantee the proportion of each blend components, and to achieve design refrigeration effect, otherwise it will get worse and worse.

because of refrigerant R404A and lubricating oil has nothing to do with the intermiscibility of water is very good, so the system of water and residue, and cleanliness requirements such as compared with R22 refrigerant are improved, R404A moisture control and impurities control system is an important indicator of the system in the corresponding filter unit, etc. To make changes.

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