Selection and replacement cycle of drying filter for cold storage system | Moisture and acid control plan
The dry filter is installed at the front end of the compressor's liquid supply, with the core function of adsorbing moisture and acidic impurities in the refrigerant system, preventing ice blockage, refrigeration oil acidification, and motor winding corrosion.
The R404A and R507 low-temperature systems use molecular sieve filter cartridges with a filtration accuracy of 20 microns. The filter cartridge capacity is selected based on 15% of the system refrigerant charge to ensure adsorption capacity.
The Xitelide complete set of compression condensing units comes standard with a dry filter when leaving the factory. After a new cold storage system is built and the pressure test and vacuum extraction are qualified, a new filter element must be replaced before adding refrigerant.
The most typical phenomenon of excessive water content in the system is ice blockage at the throttling position of the expansion valve. After the storage temperature drops to a certain temperature, it no longer decreases, and after stopping and warming up for a period of time, it can be cooled again.
The acidification of refrigeration oil produces acidic substances that slowly corrode the valve plate coating and motor insulation layer. The filter also adsorbs acidic products, delaying the internal aging process of the compressor.
Conventional stable cold storage, with a drying filter cartridge replacement cycle of 8000 hours; For units that have undergone major repairs due to liquid hammer or system water ingress, the filter element must be replaced in advance after 2000 hours.
Many maintenance technicians only replace the refrigeration oil when overhauling the unit, without replacing the dry filter. The acid and moisture adsorbed in the old filter element will be released again, and the new oil will quickly deteriorate and become ineffective.
The export cryogenic R23 unit has higher requirements for moisture control, and R23 is more corrosive when hydrolyzed by water. The filter selection capacity is 40% larger than that of R404A system.
A liquid sight glass is installed at the inlet and outlet of the filter. If the liquid sight glass turns yellow, it indicates that the water content in the system exceeds the standard. If it turns green, it indicates that it is qualified. If it turns brown, it indicates that acidification has occurred.
Dry filters are disposable consumables that cannot be regenerated after adsorption saturation. It is recommended to provide customers with spare filters of the same specifications in the foreign trade spare parts package for easy on-site maintenance and replacement.
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FAQ
What substances do dry filters mainly adsorb? Adsorb moisture and acidic impurities within the system.
2. What color of the sight glass represents excessive moisture? The yellowing of the sight glass indicates excessive moisture.
3. Should I replace the filter before adding refrigerant to the new cold storage? Replace the filter element with a brand new one after pressure testing and vacuuming.
4. What is the replacement cycle for filters under normal operating conditions? The regular stable cold storage takes about 8000 hours to replace.
5. How long does it take to replace the filter after liquid hammer overhaul? Suggest replacing the filter element within 2000 hours in advance.
How to choose the filter capacity for R23 cryogenic unit? 40% capacity increase compared to R404A system.
Can saturated dry filters be dried and regenerated? No, it belongs to disposable consumables.
