By the way, the refrigerant is not sluggish, it moves quite well even in sub-zero temperatures.
The term "slugging" liquid refers to the introduction of a large quantity of liquid "a slug" into the compressor cylinder. Think of the old westerns when the cowboy tilts his head back and takes a "slug" of liquor.

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Jim Luttrall
Mr. Inspector.net, Inc.
Allen, Texas 75002