Automotive Air Conditioning Receiver Drier
The receiver drier looks like a small, sealed metal can, with an inlet, and an outlet. They are only used on systems which contain expansion valves. Receiver driers are comparable to accumulators in many ways. It differs from an accumulator in that it is around half the size. It is located in the high pressure side of the air conditioning system which is usually between the condenser outlet and the expansion valve inlet. The receiver driers primary function is to receive and store some liquid coolant from the condenser. It is also used to separate gas and liquid for the rest of the system. As the liquid coolant enters at the top of the receiver, it falls to the bottom were it is stored. A pickup tube which has a filter screen extends all the way to the bottom of the drier to draw liquid from the bottom were it is being collected. The liquid then passes into the inlet of the thermostatic expansion valve. This part also stores refrigerant and oil when they are not needed for operation in the system. The receiver drier also contains system desiccant which is the drier function of this unit. This desiccant feature of the receiver drier helps to keep debris and moisture out of the compressor and serves as the air filter for the air conditioning system.
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