![]() ![]() The symptoms for a partially plugged filter drier include: The system has R-134a as the working refrigerant. In this example, assume that the refrigeration system is a TXV/receiver system employing a filter drier and sight glass. It is important to note that any restriction or damage to the liquid line from the receiver outlet to the metering device inlet will have similar symptoms as a restricted filter drier. Figure 1 (top) illustrates a cutaway of a liquid line filter drier. Because the filter drier is located in the liquid line, a restricted filter drier can be referred to as a liquid line restriction. The filter drier is located in the refrigeration system’s liquid line, which is located between the receiver and the metering device. In the example scenario below, the refrigeration system has a partially restricted filter drier. Filter driers with molecular sieves keep freeze-ups, system corrosion, and acid formations at a minimum. The surface of the desiccant is coated with a positive charge called a cat ion, which attracts polarized molecules such as water. The proper filter drier selection allows water to be absorbed, while at the same time allowing larger molecules like refrigerant and oils to pass by freely. They can selectively absorb molecules based on their polarity (charge) or size. Molecular sieve desiccants have honeycomb structures with cavities that are uniform in size. Activated alumina is often used in both liquid and suction line filter driers for acid cleanups after system burnouts. This is often referred to as system burnout. Inorganic acids like hydrofluoric and hydrochloric acids are formed when certain refrigerants and water are broken down from very high operating temperatures in a refrigeration system. Activated alumina is used for removing organic acid molecules from refrigeration systems. Some of the most common materials used in filter drier construction are activated alumina and molecular sieve desiccants. Improper handling of system piping at installation.Improper handling of hygroscopic system lubricants and.Improper brazing or soldering techniques.Some sources of moisture in refrigeration and air conditioning systems include: Of all these issues, it is excessive moisture that causes most filter driers to become restricted. They are notorious for becoming restricted due to moisture, sludge, dirt, or oil that has entered the system from a poor service practice or extreme operating conditions. ![]() Filter driers are designed to remove foreign materials from refrigeration or air conditioning systems. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |