http://www.fileden.com/files/2008/6/18/1965139/Doc1.doc
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The difference in surface tension attracts the refrigerant to be absorbed into the oil. The process will continue until the is a pure band of liquid refrigerant lying under the oil [since it weighs more]. This is where the oil pump inlet screen is located. Starting the compressor pumps the liquid refrigerant to the bearings, removing any oil film, adhering the aluminum rods to the crankshaft.
Using crankcase heat drives the refrigerant out of the oil to condense somewhere cooler.
Ok guys, this unit is a Trane XE 1000. It it model number TWR018C100A4. mANUFACTURED IN 08/2002.
Here is how this thing is mounted. The liquid line comes into the unit. The liquid line T's off to a part resembling a factory line dryer (1' diameter x about 5 inches long), and then goes into the TXV. The other line off of the T goes to this Charge robber, which again resembles a field liquid line dryer, and then comes back into the line that comes out of the TXV just before the diffuser that branches off to the circuits.
Does this ring a bell to anyone?
In Trane WebCats its listed as a accumulator; Charge Robber ( part #ACC00085). I believe Big John got it correct.:)
I know that on trane condensers, they utilize a ll drier before the txv that looks like a generic torpedo style copper drier, because the liq line travels in one direction and the suction the same, the use of a bi flow drier outside of these units is not needed.