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Commercial refrigeration refrigerant mixing matters needing attention
commercial refrigeration refrigerant mixing matters
Exchange of R12 and mixed refrigerants Because of the similar characteristics of R12 and mixed refrigerants, the two refrigerants are interchangeable during maintenance, but they are The following points should be noted during commercial refrigeration maintenance:
①The filling volume of the mixed working fluid is 25%-40% less than that of R12;
For R12 refrigerant, the length of the capillary tube should be adjusted according to the characteristics of commercial refrigeration.
④The operation method of R12 refrigerant can be adopted for the sealing. A bayonet can be added during E operation, and an exhaust system can be added at the sealing.
The substitution of other refrigerants is based on the requirements of commercial refrigeration manufacturers. Except for R12 and mixed working fluids, other refrigerants are not allowed to be substituted in principle. The reasons are as follows:
(1) R134a refrigerant cannot replace compression using R134a refrigerant The machine uses vinegar-type refrigerating oil, which cannot be compatible with other refrigerants, so it cannot be replaced by other refrigerants. [Note] At present, some maintenance industries use R12 refrigerant to replace R134a, instead of replacing the compressor, only the special drying filter for R134a is replaced. Although the commercial refrigeration can be refrigerated, it can be turned on or off, but the performance is poor, which makes the compressor performance Decrease, affect the service life.
(2) R600a refrigerant substitution problem The compressor using R600a refrigerant, although the refrigerating oil used is the same as the compressor using R12, it is mineral oil, but the cylinder volume of the R600a compressor is 65 larger than that of the R12 compressor %～70%. If the compressor is not replaced, replace R600a with R12 refrigerant, which may cause damage to the compressor due to liquid shock. If the R12 compressor is replaced, the filter is replaced by a common type, and the residual R600a refrigerant in the system must be completely removed, then R12 refrigerant can be added, and the performance of commercial refrigeration is basically not affected.
The above articles are from refrigerated showcase walk-in cooler and commercial refrigeration. For details, please visit: www.ihdjx.com
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